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681
LICENSE
681
LICENSE
@@ -1,674 +1,13 @@
|
||||
GNU GENERAL PUBLIC LICENSE
|
||||
Version 3, 29 June 2007
|
||||
Copyright 2021 Kai S. K. Engelbart
|
||||
|
||||
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
|
||||
Everyone is permitted to copy and distribute verbatim copies
|
||||
of this license document, but changing it is not allowed.
|
||||
Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
||||
You may obtain a copy of the License at
|
||||
|
||||
Preamble
|
||||
https://www.apache.org/licenses/LICENSE-2.0
|
||||
|
||||
The GNU General Public License is a free, copyleft license for
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software and other kinds of works.
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|
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The licenses for most software and other practical works are designed
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to take away your freedom to share and change the works. By contrast,
|
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the GNU General Public License is intended to guarantee your freedom to
|
||||
share and change all versions of a program--to make sure it remains free
|
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software for all its users. We, the Free Software Foundation, use the
|
||||
GNU General Public License for most of our software; it applies also to
|
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any other work released this way by its authors. You can apply it to
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your programs, too.
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When we speak of free software, we are referring to freedom, not
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To protect your rights, we need to prevent others from denying you
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The precise terms and conditions for copying, distribution and
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TERMS AND CONDITIONS
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0. Definitions.
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"This License" refers to version 3 of the GNU General Public License.
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The Corresponding Source for a work in source code form is that
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All rights granted under this License are granted for the term of
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You may make, run and propagate covered works that you do not
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keep intact all notices stating that this License and any
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keep intact all notices of the absence of any warranty; and give all
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You may convey a work based on the Program, or the modifications to
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|
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||||
"keep intact all notices".
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|
||||
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|
||||
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A compilation of a covered work with other separate and independent
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|
||||
You may convey a covered work in object code form under the terms
|
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|
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|
||||
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|
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|
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|
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you inform other peers where the object code and Corresponding
|
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|
||||
A separable portion of the object code, whose source code is excluded
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||||
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|
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|
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A "User Product" is either (1) a "consumer product", which means any
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||||
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|
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|
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|
||||
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|
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|
||||
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||||
|
||||
If you convey an object code work under this section in, or with, or
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||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
|
||||
"Additional permissions" are terms that supplement the terms of this
|
||||
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|
||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
When you convey a copy of a covered work, you may at your option
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||||
Notwithstanding any other provision of this License, for material you
|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
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||||
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|
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|
||||
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|
||||
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||||
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|
||||
restriction, you may remove that term. If a license document contains
|
||||
a further restriction but permits relicensing or conveying under this
|
||||
License, you may add to a covered work material governed by the terms
|
||||
of that license document, provided that the further restriction does
|
||||
not survive such relicensing or conveying.
|
||||
|
||||
If you add terms to a covered work in accord with this section, you
|
||||
must place, in the relevant source files, a statement of the
|
||||
additional terms that apply to those files, or a notice indicating
|
||||
where to find the applicable terms.
|
||||
|
||||
Additional terms, permissive or non-permissive, may be stated in the
|
||||
form of a separately written license, or stated as exceptions;
|
||||
the above requirements apply either way.
|
||||
|
||||
8. Termination.
|
||||
|
||||
You may not propagate or modify a covered work except as expressly
|
||||
provided under this License. Any attempt otherwise to propagate or
|
||||
modify it is void, and will automatically terminate your rights under
|
||||
this License (including any patent licenses granted under the third
|
||||
paragraph of section 11).
|
||||
|
||||
However, if you cease all violation of this License, then your
|
||||
license from a particular copyright holder is reinstated (a)
|
||||
provisionally, unless and until the copyright holder explicitly and
|
||||
finally terminates your license, and (b) permanently, if the copyright
|
||||
holder fails to notify you of the violation by some reasonable means
|
||||
prior to 60 days after the cessation.
|
||||
|
||||
Moreover, your license from a particular copyright holder is
|
||||
reinstated permanently if the copyright holder notifies you of the
|
||||
violation by some reasonable means, this is the first time you have
|
||||
received notice of violation of this License (for any work) from that
|
||||
copyright holder, and you cure the violation prior to 30 days after
|
||||
your receipt of the notice.
|
||||
|
||||
Termination of your rights under this section does not terminate the
|
||||
licenses of parties who have received copies or rights from you under
|
||||
this License. If your rights have been terminated and not permanently
|
||||
reinstated, you do not qualify to receive new licenses for the same
|
||||
material under section 10.
|
||||
|
||||
9. Acceptance Not Required for Having Copies.
|
||||
|
||||
You are not required to accept this License in order to receive or
|
||||
run a copy of the Program. Ancillary propagation of a covered work
|
||||
occurring solely as a consequence of using peer-to-peer transmission
|
||||
to receive a copy likewise does not require acceptance. However,
|
||||
nothing other than this License grants you permission to propagate or
|
||||
modify any covered work. These actions infringe copyright if you do
|
||||
not accept this License. Therefore, by modifying or propagating a
|
||||
covered work, you indicate your acceptance of this License to do so.
|
||||
|
||||
10. Automatic Licensing of Downstream Recipients.
|
||||
|
||||
Each time you convey a covered work, the recipient automatically
|
||||
receives a license from the original licensors, to run, modify and
|
||||
propagate that work, subject to this License. You are not responsible
|
||||
for enforcing compliance by third parties with this License.
|
||||
|
||||
An "entity transaction" is a transaction transferring control of an
|
||||
organization, or substantially all assets of one, or subdividing an
|
||||
organization, or merging organizations. If propagation of a covered
|
||||
work results from an entity transaction, each party to that
|
||||
transaction who receives a copy of the work also receives whatever
|
||||
licenses to the work the party's predecessor in interest had or could
|
||||
give under the previous paragraph, plus a right to possession of the
|
||||
Corresponding Source of the work from the predecessor in interest, if
|
||||
the predecessor has it or can get it with reasonable efforts.
|
||||
|
||||
You may not impose any further restrictions on the exercise of the
|
||||
rights granted or affirmed under this License. For example, you may
|
||||
not impose a license fee, royalty, or other charge for exercise of
|
||||
rights granted under this License, and you may not initiate litigation
|
||||
(including a cross-claim or counterclaim in a lawsuit) alleging that
|
||||
any patent claim is infringed by making, using, selling, offering for
|
||||
sale, or importing the Program or any portion of it.
|
||||
|
||||
11. Patents.
|
||||
|
||||
A "contributor" is a copyright holder who authorizes use under this
|
||||
License of the Program or a work on which the Program is based. The
|
||||
work thus licensed is called the contributor's "contributor version".
|
||||
|
||||
A contributor's "essential patent claims" are all patent claims
|
||||
owned or controlled by the contributor, whether already acquired or
|
||||
hereafter acquired, that would be infringed by some manner, permitted
|
||||
by this License, of making, using, or selling its contributor version,
|
||||
but do not include claims that would be infringed only as a
|
||||
consequence of further modification of the contributor version. For
|
||||
purposes of this definition, "control" includes the right to grant
|
||||
patent sublicenses in a manner consistent with the requirements of
|
||||
this License.
|
||||
|
||||
Each contributor grants you a non-exclusive, worldwide, royalty-free
|
||||
patent license under the contributor's essential patent claims, to
|
||||
make, use, sell, offer for sale, import and otherwise run, modify and
|
||||
propagate the contents of its contributor version.
|
||||
|
||||
In the following three paragraphs, a "patent license" is any express
|
||||
agreement or commitment, however denominated, not to enforce a patent
|
||||
(such as an express permission to practice a patent or covenant not to
|
||||
sue for patent infringement). To "grant" such a patent license to a
|
||||
party means to make such an agreement or commitment not to enforce a
|
||||
patent against the party.
|
||||
|
||||
If you convey a covered work, knowingly relying on a patent license,
|
||||
and the Corresponding Source of the work is not available for anyone
|
||||
to copy, free of charge and under the terms of this License, through a
|
||||
publicly available network server or other readily accessible means,
|
||||
then you must either (1) cause the Corresponding Source to be so
|
||||
available, or (2) arrange to deprive yourself of the benefit of the
|
||||
patent license for this particular work, or (3) arrange, in a manner
|
||||
consistent with the requirements of this License, to extend the patent
|
||||
license to downstream recipients. "Knowingly relying" means you have
|
||||
actual knowledge that, but for the patent license, your conveying the
|
||||
covered work in a country, or your recipient's use of the covered work
|
||||
in a country, would infringe one or more identifiable patents in that
|
||||
country that you have reason to believe are valid.
|
||||
|
||||
If, pursuant to or in connection with a single transaction or
|
||||
arrangement, you convey, or propagate by procuring conveyance of, a
|
||||
covered work, and grant a patent license to some of the parties
|
||||
receiving the covered work authorizing them to use, propagate, modify
|
||||
or convey a specific copy of the covered work, then the patent license
|
||||
you grant is automatically extended to all recipients of the covered
|
||||
work and works based on it.
|
||||
|
||||
A patent license is "discriminatory" if it does not include within
|
||||
the scope of its coverage, prohibits the exercise of, or is
|
||||
conditioned on the non-exercise of one or more of the rights that are
|
||||
specifically granted under this License. You may not convey a covered
|
||||
work if you are a party to an arrangement with a third party that is
|
||||
in the business of distributing software, under which you make payment
|
||||
to the third party based on the extent of your activity of conveying
|
||||
the work, and under which the third party grants, to any of the
|
||||
parties who would receive the covered work from you, a discriminatory
|
||||
patent license (a) in connection with copies of the covered work
|
||||
conveyed by you (or copies made from those copies), or (b) primarily
|
||||
for and in connection with specific products or compilations that
|
||||
contain the covered work, unless you entered into that arrangement,
|
||||
or that patent license was granted, prior to 28 March 2007.
|
||||
|
||||
Nothing in this License shall be construed as excluding or limiting
|
||||
any implied license or other defenses to infringement that may
|
||||
otherwise be available to you under applicable patent law.
|
||||
|
||||
12. No Surrender of Others' Freedom.
|
||||
|
||||
If conditions are imposed on you (whether by court order, agreement or
|
||||
otherwise) that contradict the conditions of this License, they do not
|
||||
excuse you from the conditions of this License. If you cannot convey a
|
||||
covered work so as to satisfy simultaneously your obligations under this
|
||||
License and any other pertinent obligations, then as a consequence you may
|
||||
not convey it at all. For example, if you agree to terms that obligate you
|
||||
to collect a royalty for further conveying from those to whom you convey
|
||||
the Program, the only way you could satisfy both those terms and this
|
||||
License would be to refrain entirely from conveying the Program.
|
||||
|
||||
13. Use with the GNU Affero General Public License.
|
||||
|
||||
Notwithstanding any other provision of this License, you have
|
||||
permission to link or combine any covered work with a work licensed
|
||||
under version 3 of the GNU Affero General Public License into a single
|
||||
combined work, and to convey the resulting work. The terms of this
|
||||
License will continue to apply to the part which is the covered work,
|
||||
but the special requirements of the GNU Affero General Public License,
|
||||
section 13, concerning interaction through a network will apply to the
|
||||
combination as such.
|
||||
|
||||
14. Revised Versions of this License.
|
||||
|
||||
The Free Software Foundation may publish revised and/or new versions of
|
||||
the GNU General Public License from time to time. Such new versions will
|
||||
be similar in spirit to the present version, but may differ in detail to
|
||||
address new problems or concerns.
|
||||
|
||||
Each version is given a distinguishing version number. If the
|
||||
Program specifies that a certain numbered version of the GNU General
|
||||
Public License "or any later version" applies to it, you have the
|
||||
option of following the terms and conditions either of that numbered
|
||||
version or of any later version published by the Free Software
|
||||
Foundation. If the Program does not specify a version number of the
|
||||
GNU General Public License, you may choose any version ever published
|
||||
by the Free Software Foundation.
|
||||
|
||||
If the Program specifies that a proxy can decide which future
|
||||
versions of the GNU General Public License can be used, that proxy's
|
||||
public statement of acceptance of a version permanently authorizes you
|
||||
to choose that version for the Program.
|
||||
|
||||
Later license versions may give you additional or different
|
||||
permissions. However, no additional obligations are imposed on any
|
||||
author or copyright holder as a result of your choosing to follow a
|
||||
later version.
|
||||
|
||||
15. Disclaimer of Warranty.
|
||||
|
||||
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
|
||||
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
|
||||
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
|
||||
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
|
||||
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
|
||||
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
|
||||
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
|
||||
|
||||
16. Limitation of Liability.
|
||||
|
||||
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
|
||||
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
|
||||
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
|
||||
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
|
||||
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
|
||||
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
|
||||
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
|
||||
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
|
||||
SUCH DAMAGES.
|
||||
|
||||
17. Interpretation of Sections 15 and 16.
|
||||
|
||||
If the disclaimer of warranty and limitation of liability provided
|
||||
above cannot be given local legal effect according to their terms,
|
||||
reviewing courts shall apply local law that most closely approximates
|
||||
an absolute waiver of all civil liability in connection with the
|
||||
Program, unless a warranty or assumption of liability accompanies a
|
||||
copy of the Program in return for a fee.
|
||||
|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
How to Apply These Terms to Your New Programs
|
||||
|
||||
If you develop a new program, and you want it to be of the greatest
|
||||
possible use to the public, the best way to achieve this is to make it
|
||||
free software which everyone can redistribute and change under these terms.
|
||||
|
||||
To do so, attach the following notices to the program. It is safest
|
||||
to attach them to the start of each source file to most effectively
|
||||
state the exclusion of warranty; and each file should have at least
|
||||
the "copyright" line and a pointer to where the full notice is found.
|
||||
|
||||
<one line to give the program's name and a brief idea of what it does.>
|
||||
Copyright (C) <year> <name of author>
|
||||
|
||||
This program is free software: you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation, either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
Also add information on how to contact you by electronic and paper mail.
|
||||
|
||||
If the program does terminal interaction, make it output a short
|
||||
notice like this when it starts in an interactive mode:
|
||||
|
||||
<program> Copyright (C) <year> <name of author>
|
||||
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
|
||||
This is free software, and you are welcome to redistribute it
|
||||
under certain conditions; type `show c' for details.
|
||||
|
||||
The hypothetical commands `show w' and `show c' should show the appropriate
|
||||
parts of the General Public License. Of course, your program's commands
|
||||
might be different; for a GUI interface, you would use an "about box".
|
||||
|
||||
You should also get your employer (if you work as a programmer) or school,
|
||||
if any, to sign a "copyright disclaimer" for the program, if necessary.
|
||||
For more information on this, and how to apply and follow the GNU GPL, see
|
||||
<http://www.gnu.org/licenses/>.
|
||||
|
||||
The GNU General Public License does not permit incorporating your program
|
||||
into proprietary programs. If your program is a subroutine library, you
|
||||
may consider it more useful to permit linking proprietary applications with
|
||||
the library. If this is what you want to do, use the GNU Lesser General
|
||||
Public License instead of this License. But first, please read
|
||||
<http://www.gnu.org/philosophy/why-not-lgpl.html>.
|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
|
||||
46
README.md
46
README.md
@@ -45,9 +45,6 @@ public class SimpleEventListener {
|
||||
}
|
||||
```
|
||||
|
||||
In this case, an event bus is created and used locally.
|
||||
In a more sophisticated example the class would acquire an external event bus that is used by multiple classes.
|
||||
|
||||
Note that creating static event handlers like this
|
||||
|
||||
```java
|
||||
@@ -97,6 +94,13 @@ private void onSimpleEvent() {
|
||||
|
||||
Make sure that you **do not** both declare a parameter and specify the event type in the annotation, as this would be ambiguous.
|
||||
|
||||
## Listener-Level Properties
|
||||
|
||||
When defining a dedicated event listener that, for example, performs pre- or post-processing, all event handlers will probably have the same non-standard priority.
|
||||
Instead of defining that priority for each handler, it can be defined at the listener level by annotating the listener itself.
|
||||
|
||||
The same applies to polymorphism.
|
||||
|
||||
## Event Consumption
|
||||
|
||||
In some cases it might be useful to stop the propagation of an event.
|
||||
@@ -123,6 +127,38 @@ This applies to all event handlers that would have been executed after the one c
|
||||
Avoid cancelling events while using multiple event handlers with the same priority.
|
||||
As event handlers are ordered by priority, it is not defined which of them will be executed after the event has been consumed.
|
||||
|
||||
## System Events
|
||||
|
||||
To accommodate for special circumstances in an event distribution, system events have been introduced.
|
||||
At the moment, there are two system events, which are explained in this section.
|
||||
|
||||
### Detecting Unhandled Events
|
||||
|
||||
When an event is dispatched but not delivered to any handler, a dead event is dispatched that wraps the original event.
|
||||
You can declare a dead event handler to respond to this situation:
|
||||
|
||||
```java
|
||||
private void onDeadEvent(DeadEvent deadEvent) { ... }
|
||||
```
|
||||
|
||||
### Detecting Exceptions Thrown by Event Handlers
|
||||
|
||||
When an event handler throws an exception, an exception event is dispatched that wraps the original event.
|
||||
A exception handler is declared as follows:
|
||||
|
||||
```java
|
||||
private void onExceptionEvent(ExceptionEvent ExceptionEvent) { ... }
|
||||
```
|
||||
|
||||
Both system events reference the event bus that caused them and a warning is logged if they are unhandled.
|
||||
|
||||
### What About Endless Recursion Caused By Dead Events and Exception Events?
|
||||
|
||||
As one might imagine, an unhandled dead event would theoretically lead to an endless recursion.
|
||||
The same applies when an exception event handler throws an exception.
|
||||
|
||||
To avoid this, system events never cause system events and instead just issue a warning to the logger.
|
||||
|
||||
## Installation
|
||||
|
||||
Event Bus is available in Maven Central.
|
||||
@@ -133,7 +169,7 @@ To include it inside your project, just add the following dependency to your `po
|
||||
<dependency>
|
||||
<groupId>dev.kske</groupId>
|
||||
<artifactId>event-bus-core</artifactId>
|
||||
<version>1.0.0</version>
|
||||
<version>1.1.0</version>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
```
|
||||
@@ -169,7 +205,7 @@ When using Maven, it can be registered using the Maven Compiler Plugin:
|
||||
<annotationProcessorPath>
|
||||
<groupId>dev.kske</groupId>
|
||||
<artifactId>event-bus-proc</artifactId>
|
||||
<version>1.0.0</version>
|
||||
<version>1.1.0</version>
|
||||
</annotationProcessorPath>
|
||||
</annotationProcessorPaths>
|
||||
</configuration>
|
||||
|
||||
@@ -9,14 +9,14 @@
|
||||
<parent>
|
||||
<groupId>dev.kske</groupId>
|
||||
<artifactId>event-bus</artifactId>
|
||||
<version>1.0.0</version>
|
||||
<version>1.1.0</version>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
<dependency>
|
||||
<groupId>org.junit.jupiter</groupId>
|
||||
<artifactId>junit-jupiter-api</artifactId>
|
||||
<version>5.6.2</version>
|
||||
<version>5.8.1</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
@@ -26,5 +26,14 @@
|
||||
<!-- Disable resource folder -->
|
||||
<resources />
|
||||
|
||||
<!-- Run unit tests -->
|
||||
<plugins>
|
||||
<plugin>
|
||||
<groupId>org.apache.maven.plugins</groupId>
|
||||
<artifactId>maven-surefire-plugin</artifactId>
|
||||
<version>3.0.0-M5</version>
|
||||
</plugin>
|
||||
</plugins>
|
||||
|
||||
</build>
|
||||
</project>
|
||||
@@ -0,0 +1,37 @@
|
||||
package dev.kske.eventbus.core;
|
||||
|
||||
/**
|
||||
* Wraps an event that was dispatched but for which no handler has been bound.
|
||||
* <p>
|
||||
* Handling dead events is useful as it can identify a poorly configured event distribution.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 1.1.0
|
||||
*/
|
||||
public final class DeadEvent {
|
||||
|
||||
private final EventBus eventBus;
|
||||
private final Object event;
|
||||
|
||||
DeadEvent(EventBus eventBus, Object event) {
|
||||
this.eventBus = eventBus;
|
||||
this.event = event;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return String.format("DeadEvent[eventBus=%s, event=%s]", eventBus, event);
|
||||
}
|
||||
|
||||
/**
|
||||
* @return the event bus that dispatched this event
|
||||
* @since 1.1.0
|
||||
*/
|
||||
public EventBus getEventBus() { return eventBus; }
|
||||
|
||||
/**
|
||||
* @return the event that could not be delivered
|
||||
* @since 1.1.0
|
||||
*/
|
||||
public Object getEvent() { return event; }
|
||||
}
|
||||
@@ -22,7 +22,7 @@ import java.lang.annotation.*;
|
||||
public @interface Event {
|
||||
|
||||
/**
|
||||
* Defines the event type the handler listens to. If this value is set, the handler is not
|
||||
* Defines the event type the handler listens for. If this value is set, the handler is not
|
||||
* allowed to declare parameters.
|
||||
* <p>
|
||||
* This is useful when the event handler does not utilize the event instance.
|
||||
|
||||
@@ -2,8 +2,12 @@ package dev.kske.eventbus.core;
|
||||
|
||||
import java.lang.System.Logger;
|
||||
import java.lang.System.Logger.Level;
|
||||
import java.lang.reflect.InvocationTargetException;
|
||||
import java.util.*;
|
||||
import java.util.concurrent.ConcurrentHashMap;
|
||||
import java.util.function.Consumer;
|
||||
|
||||
import dev.kske.eventbus.core.handler.*;
|
||||
|
||||
/**
|
||||
* Event listeners can be registered at an event bus to be notified when an event is dispatched.
|
||||
@@ -26,36 +30,80 @@ public final class EventBus {
|
||||
*/
|
||||
private static final class DispatchState {
|
||||
|
||||
boolean isDispatching, isCancelled;
|
||||
/**
|
||||
* Indicates that the last event handler invoked has called {@link EventBus#cancel}. In that
|
||||
* case, the event is not dispatched further.
|
||||
*
|
||||
* @since 0.1.0
|
||||
*/
|
||||
boolean isCancelled;
|
||||
|
||||
/**
|
||||
* Is incremented when {@link EventBus#dispatch(Object)} is invoked and decremented when it
|
||||
* finishes. This allows keeping track of nested dispatches.
|
||||
*
|
||||
* @since 1.2.0
|
||||
*/
|
||||
int nestingCount;
|
||||
}
|
||||
|
||||
private static volatile EventBus singletonInstance;
|
||||
/**
|
||||
* The priority assigned to every event handler without an explicitly defined priority.
|
||||
*
|
||||
* @since 1.1.0
|
||||
* @see Priority
|
||||
*/
|
||||
public static final int DEFAULT_PRIORITY = 100;
|
||||
|
||||
private static final EventBus singletonInstance = new EventBus();
|
||||
|
||||
private static final Logger logger = System.getLogger(EventBus.class.getName());
|
||||
|
||||
/**
|
||||
* Produces a singleton instance of the event bus. It is lazily initialized on the first call.
|
||||
* Compares event handlers based on priority, but uses hash codes for equal priorities.
|
||||
*
|
||||
* @return a singleton instance of the event bus.
|
||||
* @implNote As the priority comparator by itself is not consistent with equals (two handlers
|
||||
* with the same priority are not necessarily equal, but would have a comparison
|
||||
* result of 0), the hash code is used for the fallback comparison. This way,
|
||||
* consistency with equals is restored.
|
||||
* @since 1.2.0
|
||||
*/
|
||||
private static final Comparator<EventHandler> byPriority =
|
||||
Comparator.comparingInt(EventHandler::getPriority).reversed()
|
||||
.thenComparingInt(EventHandler::hashCode);
|
||||
|
||||
/**
|
||||
* Returns the default event bus, which is a statically initialized singleton instance.
|
||||
*
|
||||
* @return the default event bus
|
||||
* @since 0.0.2
|
||||
*/
|
||||
public static EventBus getInstance() {
|
||||
EventBus instance = singletonInstance;
|
||||
if (instance == null)
|
||||
synchronized (EventBus.class) {
|
||||
if ((instance = singletonInstance) == null) {
|
||||
logger.log(Level.DEBUG, "Initializing singleton event bus instance");
|
||||
instance = singletonInstance = new EventBus();
|
||||
}
|
||||
}
|
||||
return instance;
|
||||
return singletonInstance;
|
||||
}
|
||||
|
||||
private final Map<Class<?>, TreeSet<EventHandler>> bindings =
|
||||
new ConcurrentHashMap<>();
|
||||
private final Set<Object> registeredListeners =
|
||||
ConcurrentHashMap.newKeySet();
|
||||
private final ThreadLocal<DispatchState> dispatchState =
|
||||
/**
|
||||
* Event handler bindings (target class to handlers registered for that class), does not contain
|
||||
* other (polymorphic) handlers.
|
||||
*
|
||||
* @since 0.0.1
|
||||
*/
|
||||
private final Map<Class<?>, TreeSet<EventHandler>> bindings = new ConcurrentHashMap<>();
|
||||
|
||||
/**
|
||||
* Stores all registered event listeners (which declare event handlers) and prevents them from
|
||||
* being garbage collected.
|
||||
*
|
||||
* @since 0.0.1
|
||||
*/
|
||||
private final Set<Object> registeredListeners = ConcurrentHashMap.newKeySet();
|
||||
|
||||
/**
|
||||
* The current event dispatching state, local to each thread.
|
||||
*
|
||||
* @since 0.1.0
|
||||
*/
|
||||
private final ThreadLocal<DispatchState> dispatchState =
|
||||
ThreadLocal.withInitial(DispatchState::new);
|
||||
|
||||
/**
|
||||
@@ -63,51 +111,83 @@ public final class EventBus {
|
||||
* priority.
|
||||
*
|
||||
* @param event the event to dispatch
|
||||
* @throws EventBusException if an event handler isn't accessible or has an invalid signature
|
||||
* @throws NullPointerException if the specified event is {@code null}
|
||||
* @since 0.0.1
|
||||
*/
|
||||
public void dispatch(Object event) {
|
||||
public void dispatch(Object event) throws EventBusException {
|
||||
Objects.requireNonNull(event);
|
||||
logger.log(Level.INFO, "Dispatching event {0}", event);
|
||||
|
||||
// Set dispatch state
|
||||
// Look up dispatch state
|
||||
var state = dispatchState.get();
|
||||
state.isDispatching = true;
|
||||
|
||||
for (var handler : getHandlersFor(event.getClass()))
|
||||
if (state.isCancelled) {
|
||||
logger.log(Level.INFO, "Cancelled dispatching event {0}", event);
|
||||
state.isCancelled = false;
|
||||
break;
|
||||
} else {
|
||||
handler.execute(event);
|
||||
}
|
||||
// Increment nesting count (becomes > 1 during nested dispatches)
|
||||
++state.nestingCount;
|
||||
|
||||
// Reset dispatch state
|
||||
state.isDispatching = false;
|
||||
Iterator<EventHandler> handlers = getHandlersFor(event.getClass()).iterator();
|
||||
if (handlers.hasNext()) {
|
||||
while (handlers.hasNext())
|
||||
if (state.isCancelled) {
|
||||
logger.log(Level.INFO, "Cancelled dispatching event {0}", event);
|
||||
state.isCancelled = false;
|
||||
break;
|
||||
} else {
|
||||
try {
|
||||
handlers.next().execute(event);
|
||||
} catch (InvocationTargetException e) {
|
||||
if (e.getCause() instanceof Error)
|
||||
|
||||
// Transparently pass error to the caller
|
||||
throw (Error) e.getCause();
|
||||
else if (event instanceof DeadEvent || event instanceof ExceptionEvent)
|
||||
|
||||
// Warn about system event not being handled
|
||||
logger.log(Level.WARNING, event + " not handled due to exception", e);
|
||||
else
|
||||
|
||||
// Dispatch exception event
|
||||
dispatch(new ExceptionEvent(this, event, e.getCause()));
|
||||
}
|
||||
}
|
||||
} else if (event instanceof DeadEvent || event instanceof ExceptionEvent) {
|
||||
|
||||
// Warn about the dead event not being handled
|
||||
logger.log(Level.WARNING, "{0} not handled", event);
|
||||
} else {
|
||||
|
||||
// Dispatch dead event
|
||||
dispatch(new DeadEvent(this, event));
|
||||
}
|
||||
|
||||
// Decrement nesting count (becomes 0 when all dispatches on the thread are finished)
|
||||
--state.nestingCount;
|
||||
|
||||
logger.log(Level.DEBUG, "Finished dispatching event {0}", event);
|
||||
}
|
||||
|
||||
/**
|
||||
* Searches for the event handlers bound to an event class.
|
||||
* Searches for the event handlers bound to an event class. This includes polymorphic handlers
|
||||
* that are bound to a supertype of the event class.
|
||||
*
|
||||
* @param eventClass the event class to use for the search
|
||||
* @return all event handlers registered for the event class
|
||||
* @since 0.0.1
|
||||
* @param eventType the event type to use for the search
|
||||
* @return a navigable set containing the applicable handlers in descending order of priority
|
||||
* @since 1.2.0
|
||||
*/
|
||||
private List<EventHandler> getHandlersFor(Class<?> eventClass) {
|
||||
private NavigableSet<EventHandler> getHandlersFor(Class<?> eventType) {
|
||||
|
||||
// Get handlers defined for the event class
|
||||
Set<EventHandler> handlers = bindings.getOrDefault(eventClass, new TreeSet<>());
|
||||
TreeSet<EventHandler> handlers =
|
||||
bindings.getOrDefault(eventType, new TreeSet<>(byPriority));
|
||||
|
||||
// Get subtype handlers
|
||||
// Get polymorphic handlers
|
||||
for (var binding : bindings.entrySet())
|
||||
if (binding.getKey().isAssignableFrom(eventClass))
|
||||
if (binding.getKey().isAssignableFrom(eventType))
|
||||
for (var handler : binding.getValue())
|
||||
if (handler.isPolymorphic())
|
||||
handlers.add(handler);
|
||||
|
||||
return new ArrayList<>(handlers);
|
||||
return handlers;
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -118,7 +198,7 @@ public final class EventBus {
|
||||
*/
|
||||
public void cancel() {
|
||||
var state = dispatchState.get();
|
||||
if (state.isDispatching && !state.isCancelled)
|
||||
if (state.nestingCount > 0 && !state.isCancelled)
|
||||
state.isCancelled = true;
|
||||
else
|
||||
throw new EventBusException("Calling thread not an active dispatching thread!");
|
||||
@@ -128,8 +208,9 @@ public final class EventBus {
|
||||
* Registers an event listener at this event bus.
|
||||
*
|
||||
* @param listener the listener to register
|
||||
* @throws EventBusException if the listener is already registered or a declared event handler
|
||||
* does not comply with the specification
|
||||
* @throws EventBusException if the listener is already registered or a declared event
|
||||
* handler does not comply with the specification
|
||||
* @throws NullPointerException if the specified listener is {@code null}
|
||||
* @since 0.0.1
|
||||
* @see Event
|
||||
*/
|
||||
@@ -140,6 +221,16 @@ public final class EventBus {
|
||||
logger.log(Level.INFO, "Registering event listener {0}", listener.getClass().getName());
|
||||
boolean handlerBound = false;
|
||||
|
||||
// Predefined handler polymorphism
|
||||
boolean polymorphic = false;
|
||||
if (listener.getClass().isAnnotationPresent(Polymorphic.class))
|
||||
polymorphic = listener.getClass().getAnnotation(Polymorphic.class).value();
|
||||
|
||||
// Predefined handler priority
|
||||
int priority = DEFAULT_PRIORITY;
|
||||
if (listener.getClass().isAnnotationPresent(Priority.class))
|
||||
priority = listener.getClass().getAnnotation(Priority.class).value();
|
||||
|
||||
registeredListeners.add(listener);
|
||||
for (var method : listener.getClass().getDeclaredMethods()) {
|
||||
Event annotation = method.getAnnotation(Event.class);
|
||||
@@ -149,11 +240,8 @@ public final class EventBus {
|
||||
continue;
|
||||
|
||||
// Initialize and bind the handler
|
||||
var handler = new EventHandler(listener, method, annotation);
|
||||
bindings.putIfAbsent(handler.getEventType(), new TreeSet<>());
|
||||
logger.log(Level.DEBUG, "Binding event handler {0}", handler);
|
||||
bindings.get(handler.getEventType())
|
||||
.add(handler);
|
||||
bindHandler(
|
||||
new ReflectiveEventHandler(listener, method, annotation, polymorphic, priority));
|
||||
handlerBound = true;
|
||||
}
|
||||
|
||||
@@ -164,6 +252,86 @@ public final class EventBus {
|
||||
listener.getClass().getName());
|
||||
}
|
||||
|
||||
/**
|
||||
* Registers a callback listener, which is a consumer that is invoked when an event occurs. The
|
||||
* listener is not polymorphic and has the {@link #DEFAULT_PRIORITY}.
|
||||
*
|
||||
* @param <E> the event type the listener listens for
|
||||
* @param eventType the event type the listener listens for
|
||||
* @param eventListener the callback that is invoked when an event occurs
|
||||
* @since 1.2.0
|
||||
* @see #registerListener(Class, Consumer, boolean, int)
|
||||
*/
|
||||
public <E> void registerListener(Class<E> eventType, Consumer<E> eventListener) {
|
||||
registerListener(eventType, eventListener, false, DEFAULT_PRIORITY);
|
||||
}
|
||||
|
||||
/**
|
||||
* Registers a callback listener, which is a consumer that is invoked when an event occurs. The
|
||||
* listener has the {@link #DEFAULT_PRIORITY}.
|
||||
*
|
||||
* @param <E> the event type the listener listens for
|
||||
* @param eventType the event type the listener listens for
|
||||
* @param eventListener the callback that is invoked when an event occurs
|
||||
* @param polymorphic whether the listener is also invoked for subtypes of the event type
|
||||
* @since 1.2.0
|
||||
* @see #registerListener(Class, Consumer, boolean, int)
|
||||
*/
|
||||
public <E> void registerListener(Class<E> eventType, Consumer<E> eventListener,
|
||||
boolean polymorphic) {
|
||||
registerListener(eventType, eventListener, polymorphic, DEFAULT_PRIORITY);
|
||||
}
|
||||
|
||||
/**
|
||||
* Registers a callback listener, which is a consumer that is invoked when an event occurs. The
|
||||
* listener is not polymorphic.
|
||||
*
|
||||
* @param <E> the event type the listener listens for
|
||||
* @param eventType the event type the listener listens for
|
||||
* @param eventListener the callback that is invoked when an event occurs
|
||||
* @param priority the priority to assign to the listener
|
||||
* @since 1.2.0
|
||||
* @see #registerListener(Class, Consumer, boolean, int)
|
||||
*/
|
||||
public <E> void registerListener(Class<E> eventType, Consumer<E> eventListener, int priority) {
|
||||
registerListener(eventType, eventListener, false, priority);
|
||||
}
|
||||
|
||||
/**
|
||||
* Registers a callback listener, which is a consumer that is invoked when an event occurs.
|
||||
*
|
||||
* @param <E> the event type the listener listens for
|
||||
* @param eventType the event type the listener listens for
|
||||
* @param eventListener the callback that is invoked when an event occurs
|
||||
* @param polymorphic whether the listener is also invoked for subtypes of the event type
|
||||
* @param priority the priority to assign to the listener
|
||||
* @since 1.2.0
|
||||
*/
|
||||
public <E> void registerListener(Class<E> eventType, Consumer<E> eventListener,
|
||||
boolean polymorphic,
|
||||
int priority) {
|
||||
Objects.requireNonNull(eventListener);
|
||||
if (registeredListeners.contains(eventListener))
|
||||
throw new EventBusException(eventListener + " already registered!");
|
||||
logger.log(Level.INFO, "Registering callback event listener {0}",
|
||||
eventListener.getClass().getName());
|
||||
|
||||
registeredListeners.add(eventListener);
|
||||
bindHandler(new CallbackEventHandler(eventType, eventListener, polymorphic, priority));
|
||||
}
|
||||
|
||||
/**
|
||||
* Inserts a new handler into the {@link #bindings} map.
|
||||
*
|
||||
* @param handler the handler to bind
|
||||
* @since 1.2.0
|
||||
*/
|
||||
private void bindHandler(EventHandler handler) {
|
||||
bindings.putIfAbsent(handler.getEventType(), new TreeSet<>(byPriority));
|
||||
logger.log(Level.DEBUG, "Binding event handler {0}", handler);
|
||||
bindings.get(handler.getEventType()).add(handler);
|
||||
}
|
||||
|
||||
/**
|
||||
* Removes a specific listener from this event bus.
|
||||
*
|
||||
@@ -174,6 +342,7 @@ public final class EventBus {
|
||||
Objects.requireNonNull(listener);
|
||||
logger.log(Level.INFO, "Removing event listener {0}", listener.getClass().getName());
|
||||
|
||||
// Remove bindings from binding map
|
||||
for (var binding : bindings.values()) {
|
||||
var it = binding.iterator();
|
||||
while (it.hasNext()) {
|
||||
@@ -184,6 +353,8 @@ public final class EventBus {
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Remove the listener itself
|
||||
registeredListeners.remove(listener);
|
||||
}
|
||||
|
||||
@@ -198,6 +369,39 @@ public final class EventBus {
|
||||
registeredListeners.clear();
|
||||
}
|
||||
|
||||
/**
|
||||
* Generates a string describing the event handlers that would be executed for a specific event
|
||||
* type, in order and without actually executing them.
|
||||
*
|
||||
* @apiNote Using this method is only recommended for debugging purposes, as the output depends
|
||||
* on implementation internals which may be subject to change.
|
||||
* @implNote Nested dispatches are not accounted for, as this would require actually executing
|
||||
* the handlers.
|
||||
* @param eventType the event type to generate the execution order for
|
||||
* @return a human-readable event handler list suitable for debugging purposes
|
||||
* @since 1.2.0
|
||||
*/
|
||||
public String printExecutionOrder(Class<?> eventType) {
|
||||
var handlers = getHandlersFor(eventType);
|
||||
var sj = new StringJoiner("\n");
|
||||
|
||||
// Output header line
|
||||
sj.add(String.format("Event handler execution order for %s (%d handler(s)):", eventType,
|
||||
handlers.size()));
|
||||
sj.add(
|
||||
"==========================================================================================");
|
||||
|
||||
// Individual handlers
|
||||
for (var handler : handlers)
|
||||
sj.add(handler.toString());
|
||||
|
||||
// Bottom line
|
||||
sj.add(
|
||||
"==========================================================================================");
|
||||
|
||||
return sj.toString();
|
||||
}
|
||||
|
||||
/**
|
||||
* Provides an unmodifiable view of the event listeners registered at this event bus.
|
||||
*
|
||||
|
||||
@@ -1,14 +1,18 @@
|
||||
package dev.kske.eventbus.core;
|
||||
|
||||
/**
|
||||
* This runtime exception is thrown when an event bus error occurs. This can
|
||||
* either occur while registering event listeners with invalid handlers, or when
|
||||
* an event handler throws an exception.
|
||||
* This unchecked exception is specific to the event bus and can be thrown under the following
|
||||
* circumstances:
|
||||
* <ul>
|
||||
* <li>An event handler throws an exception (which is stored as the cause)</li>
|
||||
* <li>An event listener with an invalid event handler is registered</li>
|
||||
* <li>{@link EventBus#cancel()} is invoked from outside an active dispatch thread</li>
|
||||
* </ul>
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 0.0.1
|
||||
*/
|
||||
public class EventBusException extends RuntimeException {
|
||||
public final class EventBusException extends RuntimeException {
|
||||
|
||||
private static final long serialVersionUID = 1L;
|
||||
|
||||
|
||||
@@ -1,133 +0,0 @@
|
||||
package dev.kske.eventbus.core;
|
||||
|
||||
import java.lang.reflect.*;
|
||||
|
||||
import dev.kske.eventbus.core.Event.USE_PARAMETER;
|
||||
|
||||
/**
|
||||
* Internal representation of an event handling method.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 0.0.1
|
||||
* @see EventBus
|
||||
*/
|
||||
final class EventHandler implements Comparable<EventHandler> {
|
||||
|
||||
/**
|
||||
* The priority assigned to every event handler without an explicitly defined priority.
|
||||
*
|
||||
* @since 1.0.0
|
||||
* @see Priority
|
||||
*/
|
||||
public static final int DEFAULT_PRIORITY = 100;
|
||||
|
||||
private final Object listener;
|
||||
private final Method method;
|
||||
private final Class<?> eventType;
|
||||
private final boolean useParameter;
|
||||
private final boolean polymorphic;
|
||||
private final int priority;
|
||||
|
||||
/**
|
||||
* Constructs an event handler.
|
||||
*
|
||||
* @param listener the listener containing the handler
|
||||
* @param method the handler method
|
||||
* @param annotation the event annotation
|
||||
* @throws EventBusException if the method or the annotation do not comply with the
|
||||
* specification
|
||||
* @since 0.0.1
|
||||
*/
|
||||
EventHandler(Object listener, Method method, Event annotation) throws EventBusException {
|
||||
this.listener = listener;
|
||||
this.method = method;
|
||||
useParameter = annotation.value() == USE_PARAMETER.class;
|
||||
|
||||
// Check handler signature
|
||||
if (method.getParameterCount() == 0 && useParameter)
|
||||
throw new EventBusException(method + " does not define an event type!");
|
||||
|
||||
if (method.getParameterCount() == 1 && !useParameter)
|
||||
throw new EventBusException(method + " defines an ambiguous event type!");
|
||||
|
||||
if (method.getParameterCount() > 1)
|
||||
throw new EventBusException(method + " defines more than one parameter!");
|
||||
|
||||
// Determine handler properties
|
||||
eventType = useParameter ? method.getParameterTypes()[0] : annotation.value();
|
||||
polymorphic = method.isAnnotationPresent(Polymorphic.class);
|
||||
priority = method.isAnnotationPresent(Priority.class)
|
||||
? method.getAnnotation(Priority.class).value()
|
||||
: DEFAULT_PRIORITY;
|
||||
|
||||
// Allow access if the method is non-public
|
||||
method.setAccessible(true);
|
||||
}
|
||||
|
||||
/**
|
||||
* Compares this to another event handler based on priority. In case of equal priority a
|
||||
* non-zero value based on hash codes is returned.
|
||||
* <p>
|
||||
* This is used to retrieve event handlers in order of descending priority from a tree set.
|
||||
*
|
||||
* @since 0.0.1
|
||||
*/
|
||||
@Override
|
||||
public int compareTo(EventHandler other) {
|
||||
int priority = other.priority - this.priority;
|
||||
if (priority == 0)
|
||||
priority = listener.hashCode() - other.listener.hashCode();
|
||||
return priority == 0 ? hashCode() - other.hashCode() : priority;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return String.format(
|
||||
"EventHandler[method=%s, eventType=%s, useParameter=%b, polymorphic=%b, priority=%d]",
|
||||
method, eventType, useParameter, polymorphic, priority);
|
||||
}
|
||||
|
||||
/**
|
||||
* Executes the event handler.
|
||||
*
|
||||
* @param event the event used as the method parameter
|
||||
* @throws EventBusException if the handler throws an exception
|
||||
* @since 0.0.1
|
||||
*/
|
||||
void execute(Object event) throws EventBusException {
|
||||
try {
|
||||
if (useParameter)
|
||||
method.invoke(listener, event);
|
||||
else
|
||||
method.invoke(listener);
|
||||
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
|
||||
throw new EventBusException("Failed to invoke event handler!", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @return the listener containing this handler
|
||||
* @since 0.0.1
|
||||
*/
|
||||
Object getListener() { return listener; }
|
||||
|
||||
/**
|
||||
* @return the event type this handler listens for
|
||||
* @since 0.0.3
|
||||
*/
|
||||
Class<?> getEventType() { return eventType; }
|
||||
|
||||
/**
|
||||
* @return the priority of this handler
|
||||
* @since 0.0.1
|
||||
* @see Priority
|
||||
*/
|
||||
int getPriority() { return priority; }
|
||||
|
||||
/**
|
||||
* @return whether this handler is polymorphic
|
||||
* @since 1.0.0
|
||||
* @see Polymorphic
|
||||
*/
|
||||
boolean isPolymorphic() { return polymorphic; }
|
||||
}
|
||||
@@ -0,0 +1,47 @@
|
||||
package dev.kske.eventbus.core;
|
||||
|
||||
/**
|
||||
* Wraps an event that was dispatched but caused an exception in one of its handlers.
|
||||
* <p>
|
||||
* Handling exception events is useful as it allows the creation of a centralized exception handling
|
||||
* mechanism for unexpected exceptions.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 1.1.0
|
||||
*/
|
||||
public final class ExceptionEvent {
|
||||
|
||||
private final EventBus eventBus;
|
||||
private final Object event;
|
||||
private final Throwable cause;
|
||||
|
||||
ExceptionEvent(EventBus eventBus, Object event, Throwable cause) {
|
||||
this.eventBus = eventBus;
|
||||
this.event = event;
|
||||
this.cause = cause;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return String.format("ExceptionEvent[eventBus=%s, event=%s, cause=%s]", eventBus, event,
|
||||
cause);
|
||||
}
|
||||
|
||||
/**
|
||||
* @return the event bus that dispatched this event
|
||||
* @since 1.1.0
|
||||
*/
|
||||
public EventBus getEventBus() { return eventBus; }
|
||||
|
||||
/**
|
||||
* @return the event that could not be handled because of an exception
|
||||
* @since 1.1.0
|
||||
*/
|
||||
public Object getEvent() { return event; }
|
||||
|
||||
/**
|
||||
* @return the exception that was thrown while handling the event
|
||||
* @since 1.1.0
|
||||
*/
|
||||
public Throwable getCause() { return cause; }
|
||||
}
|
||||
@@ -1,6 +1,6 @@
|
||||
package dev.kske.eventbus.core;
|
||||
|
||||
import static java.lang.annotation.ElementType.METHOD;
|
||||
import static java.lang.annotation.ElementType.*;
|
||||
import static java.lang.annotation.RetentionPolicy.RUNTIME;
|
||||
|
||||
import java.lang.annotation.*;
|
||||
@@ -8,6 +8,9 @@ import java.lang.annotation.*;
|
||||
/**
|
||||
* Allows an event handler to receive events that are subtypes of the declared event type.
|
||||
* <p>
|
||||
* When used on a type, the value applies to all event handlers declared within that type that don't
|
||||
* define a value on their own.
|
||||
* <p>
|
||||
* This is useful when defining an event handler for an interface or an abstract class.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
@@ -16,5 +19,12 @@ import java.lang.annotation.*;
|
||||
*/
|
||||
@Documented
|
||||
@Retention(RUNTIME)
|
||||
@Target(METHOD)
|
||||
public @interface Polymorphic {}
|
||||
@Target({ METHOD, TYPE })
|
||||
public @interface Polymorphic {
|
||||
|
||||
/**
|
||||
* @return whether the event handler is polymorphic
|
||||
* @since 1.1.0
|
||||
*/
|
||||
boolean value() default true;
|
||||
}
|
||||
|
||||
@@ -1,6 +1,6 @@
|
||||
package dev.kske.eventbus.core;
|
||||
|
||||
import static java.lang.annotation.ElementType.METHOD;
|
||||
import static java.lang.annotation.ElementType.*;
|
||||
import static java.lang.annotation.RetentionPolicy.RUNTIME;
|
||||
|
||||
import java.lang.annotation.*;
|
||||
@@ -9,6 +9,9 @@ import java.lang.annotation.*;
|
||||
* Defines the priority of an event handler. Handlers are executed in descending order of their
|
||||
* priority.
|
||||
* <p>
|
||||
* When used on a type, the value applies to all event handlers declared within that type that don't
|
||||
* define a value on their own.
|
||||
* <p>
|
||||
* Handlers without this annotation have the default priority of 100.
|
||||
* <p>
|
||||
* The execution order of handlers with the same priority is undefined.
|
||||
@@ -19,7 +22,7 @@ import java.lang.annotation.*;
|
||||
*/
|
||||
@Documented
|
||||
@Retention(RUNTIME)
|
||||
@Target(METHOD)
|
||||
@Target({ METHOD, TYPE })
|
||||
public @interface Priority {
|
||||
|
||||
/**
|
||||
|
||||
@@ -0,0 +1,73 @@
|
||||
package dev.kske.eventbus.core.handler;
|
||||
|
||||
import java.lang.reflect.InvocationTargetException;
|
||||
import java.util.function.Consumer;
|
||||
|
||||
/**
|
||||
* An event handler wrapping a callback method.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 1.2.0
|
||||
*/
|
||||
public final class CallbackEventHandler implements EventHandler {
|
||||
|
||||
private final Class<?> eventType;
|
||||
private final Consumer<Object> callback;
|
||||
private final boolean polymorphic;
|
||||
private final int priority;
|
||||
|
||||
/**
|
||||
* Constructs a callback event handler.
|
||||
*
|
||||
* @param <E> the event type of the handler
|
||||
* @param eventType the event type of the handler
|
||||
* @param callback the callback method to execute when the handler is invoked
|
||||
* @param polymorphic whether the handler is polymorphic
|
||||
* @param priority the priority of the handler
|
||||
* @since 1.2.0
|
||||
*/
|
||||
@SuppressWarnings("unchecked")
|
||||
public <E> CallbackEventHandler(Class<E> eventType, Consumer<E> callback, boolean polymorphic,
|
||||
int priority) {
|
||||
this.eventType = eventType;
|
||||
this.callback = (Consumer<Object>) callback;
|
||||
this.polymorphic = polymorphic;
|
||||
this.priority = priority;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void execute(Object event) throws InvocationTargetException {
|
||||
try {
|
||||
callback.accept(event);
|
||||
} catch (RuntimeException e) {
|
||||
throw new InvocationTargetException(e, "Callback event handler failed!");
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return String.format(
|
||||
"CallbackEventHandler[eventType=%s, polymorphic=%b, priority=%d]",
|
||||
eventType, polymorphic, priority);
|
||||
}
|
||||
|
||||
@Override
|
||||
public Consumer<?> getListener() {
|
||||
return callback;
|
||||
}
|
||||
|
||||
@Override
|
||||
public Class<?> getEventType() {
|
||||
return eventType;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int getPriority() {
|
||||
return priority;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean isPolymorphic() {
|
||||
return polymorphic;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,53 @@
|
||||
package dev.kske.eventbus.core.handler;
|
||||
|
||||
import java.lang.reflect.InvocationTargetException;
|
||||
|
||||
import dev.kske.eventbus.core.*;
|
||||
|
||||
/**
|
||||
* Internal representation of an event handling method.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 1.2.0
|
||||
* @see EventBus
|
||||
*/
|
||||
public interface EventHandler {
|
||||
|
||||
/**
|
||||
* Executes the event handler.
|
||||
*
|
||||
* @param event the event used as the method parameter
|
||||
* @throws EventBusException if the event handler isn't accessible or has an invalid
|
||||
* signature
|
||||
* @throws InvocationTargetException if the handler throws an exception
|
||||
* @throws EventBusException if the handler has the wrong signature or is inaccessible
|
||||
* @since 1.2.0
|
||||
*/
|
||||
void execute(Object event) throws EventBusException, InvocationTargetException;
|
||||
|
||||
/**
|
||||
* @return the listener containing this handler
|
||||
* @since 1.2.0
|
||||
*/
|
||||
Object getListener();
|
||||
|
||||
/**
|
||||
* @return the event type this handler listens for
|
||||
* @since 1.2.0
|
||||
*/
|
||||
Class<?> getEventType();
|
||||
|
||||
/**
|
||||
* @return the priority of this handler
|
||||
* @since 1.2.0
|
||||
* @see Priority
|
||||
*/
|
||||
int getPriority();
|
||||
|
||||
/**
|
||||
* @return whether this handler also accepts subtypes of the event type
|
||||
* @since 1.2.0
|
||||
* @see Polymorphic
|
||||
*/
|
||||
boolean isPolymorphic();
|
||||
}
|
||||
@@ -0,0 +1,105 @@
|
||||
package dev.kske.eventbus.core.handler;
|
||||
|
||||
import java.lang.reflect.*;
|
||||
|
||||
import dev.kske.eventbus.core.*;
|
||||
import dev.kske.eventbus.core.Event.USE_PARAMETER;
|
||||
|
||||
/**
|
||||
* An event handler wrapping a method annotated with {@link Event} and executing it using
|
||||
* reflection.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 1.2.0
|
||||
*/
|
||||
public final class ReflectiveEventHandler implements EventHandler {
|
||||
|
||||
private final Object listener;
|
||||
private final Method method;
|
||||
private final Class<?> eventType;
|
||||
private final boolean useParameter;
|
||||
private final boolean polymorphic;
|
||||
private final int priority;
|
||||
|
||||
/**
|
||||
* Constructs a reflective event handler.
|
||||
*
|
||||
* @param listener the listener containing the handler
|
||||
* @param method the handler method
|
||||
* @param annotation the event annotation
|
||||
* @param defPolymorphism the predefined polymorphism (default or listener-level)
|
||||
* @param defPriority the predefined priority (default or listener-level)
|
||||
* @throws EventBusException if the method or the annotation do not comply with the
|
||||
* specification
|
||||
* @since 1.2.0
|
||||
*/
|
||||
public ReflectiveEventHandler(Object listener, Method method, Event annotation,
|
||||
boolean defPolymorphism, int defPriority) throws EventBusException {
|
||||
this.listener = listener;
|
||||
this.method = method;
|
||||
useParameter = annotation.value() == USE_PARAMETER.class;
|
||||
|
||||
// Check handler signature
|
||||
if (method.getParameterCount() == 0 && useParameter)
|
||||
throw new EventBusException(method + " does not define an event type!");
|
||||
|
||||
if (method.getParameterCount() == 1 && !useParameter)
|
||||
throw new EventBusException(method + " defines an ambiguous event type!");
|
||||
|
||||
if (method.getParameterCount() > 1)
|
||||
throw new EventBusException(method + " defines more than one parameter!");
|
||||
|
||||
// Determine handler properties
|
||||
eventType = useParameter ? method.getParameterTypes()[0] : annotation.value();
|
||||
polymorphic = method.isAnnotationPresent(Polymorphic.class)
|
||||
? method.getAnnotation(Polymorphic.class).value()
|
||||
: defPolymorphism;
|
||||
priority = method.isAnnotationPresent(Priority.class)
|
||||
? method.getAnnotation(Priority.class).value()
|
||||
: defPriority;
|
||||
|
||||
// Allow access if the method is non-public
|
||||
method.setAccessible(true);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void execute(Object event) throws EventBusException, InvocationTargetException {
|
||||
try {
|
||||
if (useParameter)
|
||||
method.invoke(getListener(), event);
|
||||
else
|
||||
method.invoke(getListener());
|
||||
} catch (IllegalArgumentException e) {
|
||||
throw new EventBusException("Event handler rejected target / argument!", e);
|
||||
} catch (IllegalAccessException e) {
|
||||
throw new EventBusException("Event handler is not accessible!", e);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return String.format(
|
||||
"ReflectiveEventHandler[eventType=%s, polymorphic=%b, priority=%d, method=%s, useParameter=%b]",
|
||||
eventType, polymorphic, priority, method, useParameter);
|
||||
}
|
||||
|
||||
@Override
|
||||
public Object getListener() {
|
||||
return listener;
|
||||
}
|
||||
|
||||
@Override
|
||||
public Class<?> getEventType() {
|
||||
return eventType;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int getPriority() {
|
||||
return priority;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean isPolymorphic() {
|
||||
return polymorphic;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,8 @@
|
||||
/**
|
||||
* Contains the internal representation of event handling methods.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 1.2.0
|
||||
* @see dev.kske.eventbus.core.handler.EventHandler
|
||||
*/
|
||||
package dev.kske.eventbus.core.handler;
|
||||
@@ -11,7 +11,7 @@ import org.junit.jupiter.api.*;
|
||||
* @author Leon Hofmeister
|
||||
* @since 0.1.0
|
||||
*/
|
||||
class CancelTest {
|
||||
public class CancelTest {
|
||||
|
||||
EventBus bus;
|
||||
int hits;
|
||||
@@ -22,7 +22,7 @@ class CancelTest {
|
||||
* @since 0.1.0
|
||||
*/
|
||||
@BeforeEach
|
||||
void registerListener() {
|
||||
public void registerListener() {
|
||||
bus = new EventBus();
|
||||
bus.registerListener(this);
|
||||
}
|
||||
@@ -34,7 +34,7 @@ class CancelTest {
|
||||
* @since 0.1.0
|
||||
*/
|
||||
@Test
|
||||
void testCancellation() {
|
||||
public void testCancellation() {
|
||||
bus.dispatch(new SimpleEvent());
|
||||
assertEquals(1, hits);
|
||||
}
|
||||
|
||||
@@ -0,0 +1,49 @@
|
||||
package dev.kske.eventbus.core;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.*;
|
||||
|
||||
import org.junit.jupiter.api.Test;
|
||||
|
||||
/**
|
||||
* Tests the dispatching of a dead event if an event could not be delivered.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 1.1.0
|
||||
*/
|
||||
public class DeadTest {
|
||||
|
||||
EventBus bus = new EventBus();
|
||||
String event = "This event has no handler";
|
||||
boolean deadEventHandled;
|
||||
|
||||
/**
|
||||
* Tests dead event delivery.
|
||||
*
|
||||
* @since 1.1.0
|
||||
*/
|
||||
@Test
|
||||
public void testDeadEvent() {
|
||||
bus.registerListener(this);
|
||||
bus.dispatch(event);
|
||||
assertTrue(deadEventHandled);
|
||||
bus.removeListener(this);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests how the event bus reacts to an unhandled dead event. This should not lead to an
|
||||
* exception or an endless recursion and should be logged instead.
|
||||
*
|
||||
* @since 1.1.0
|
||||
*/
|
||||
@Test
|
||||
public void testUnhandledDeadEvent() {
|
||||
bus.dispatch(event);
|
||||
}
|
||||
|
||||
@Event
|
||||
void onDeadEvent(DeadEvent deadEvent) {
|
||||
assertEquals(bus, deadEvent.getEventBus());
|
||||
assertEquals(event, deadEvent.getEvent());
|
||||
deadEventHandled = true;
|
||||
}
|
||||
}
|
||||
@@ -10,7 +10,9 @@ import org.junit.jupiter.api.*;
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 0.0.1
|
||||
*/
|
||||
class DispatchTest {
|
||||
@Polymorphic
|
||||
@Priority(150)
|
||||
public class DispatchTest {
|
||||
|
||||
EventBus bus;
|
||||
static int hits;
|
||||
@@ -21,41 +23,57 @@ class DispatchTest {
|
||||
* @since 0.0.1
|
||||
*/
|
||||
@BeforeEach
|
||||
void registerListener() {
|
||||
public void registerListener() {
|
||||
bus = new EventBus();
|
||||
bus.registerListener(this);
|
||||
bus.registerListener(SimpleEvent.class, e -> {
|
||||
++hits;
|
||||
assertEquals(4, hits);
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests {@link EventBus#dispatch(Object)} with multiple handler priorities, a subtype handler
|
||||
* and a static handler.
|
||||
* Tests {@link EventBus#dispatch(Object)} with multiple handler priorities, a polymorphic
|
||||
* handler and a static handler.
|
||||
*
|
||||
* @since 0.0.1
|
||||
*/
|
||||
@Test
|
||||
void testDispatch() {
|
||||
public void testDispatch() {
|
||||
bus.dispatch(new SimpleEventSub());
|
||||
bus.dispatch(new SimpleEvent());
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests {@link EventBus#printExecutionOrder(Class)} based on the currently registered handlers.
|
||||
*
|
||||
* @since 1.2.0
|
||||
*/
|
||||
@Test
|
||||
public void testPrintExecutionOrder() {
|
||||
String executionOrder = bus.printExecutionOrder(SimpleEvent.class);
|
||||
System.out.println(executionOrder);
|
||||
assertEquals(
|
||||
"Event handler execution order for class dev.kske.eventbus.core.SimpleEvent (3 handler(s)):\n"
|
||||
+ "==========================================================================================\n"
|
||||
+ "ReflectiveEventHandler[eventType=class dev.kske.eventbus.core.SimpleEvent, polymorphic=true, priority=200, method=void dev.kske.eventbus.core.DispatchTest.onSimpleEventFirst(), useParameter=false]\n"
|
||||
+ "ReflectiveEventHandler[eventType=class dev.kske.eventbus.core.SimpleEvent, polymorphic=false, priority=150, method=static void dev.kske.eventbus.core.DispatchTest.onSimpleEventSecond(), useParameter=false]\n"
|
||||
+ "CallbackEventHandler[eventType=class dev.kske.eventbus.core.SimpleEvent, polymorphic=false, priority=100]\n"
|
||||
+ "==========================================================================================",
|
||||
executionOrder);
|
||||
}
|
||||
|
||||
@Event(SimpleEvent.class)
|
||||
@Priority(200)
|
||||
@Polymorphic
|
||||
void onSimpleEventFirst() {
|
||||
++hits;
|
||||
assertTrue(hits == 1 || hits == 2);
|
||||
}
|
||||
|
||||
@Event(SimpleEvent.class)
|
||||
@Priority(150)
|
||||
@Polymorphic(false)
|
||||
static void onSimpleEventSecond() {
|
||||
++hits;
|
||||
assertEquals(3, hits);
|
||||
}
|
||||
|
||||
@Event
|
||||
void onSimpleEventThird(SimpleEvent event) {
|
||||
++hits;
|
||||
assertEquals(4, hits);
|
||||
}
|
||||
}
|
||||
|
||||
@@ -0,0 +1,62 @@
|
||||
package dev.kske.eventbus.core;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.*;
|
||||
|
||||
import org.junit.jupiter.api.Test;
|
||||
|
||||
/**
|
||||
* Tests the dispatching of an exception event if an event handler threw an exception.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 1.1.0
|
||||
*/
|
||||
public class ExceptionTest {
|
||||
|
||||
EventBus bus = new EventBus();
|
||||
String event = "This event will cause an exception";
|
||||
RuntimeException exception = new RuntimeException("I failed");
|
||||
boolean exceptionEventHandled;
|
||||
|
||||
/**
|
||||
* Tests exception event delivery.
|
||||
*
|
||||
* @since 1.1.0
|
||||
*/
|
||||
@Test
|
||||
public void testExceptionEvent() {
|
||||
bus.registerListener(this);
|
||||
bus.registerListener(new ExceptionListener());
|
||||
bus.dispatch(event);
|
||||
assertTrue(exceptionEventHandled);
|
||||
bus.clearListeners();
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests how the event bus reacts to an unhandled exception event. This should not lead to an
|
||||
* exception or an endless recursion and should be logged instead.
|
||||
*
|
||||
* @since 1.1.0
|
||||
*/
|
||||
@Test
|
||||
public void testUnhandledExceptionEvent() {
|
||||
bus.registerListener(this);
|
||||
bus.dispatch(event);
|
||||
bus.removeListener(this);
|
||||
}
|
||||
|
||||
@Event(String.class)
|
||||
void onString() {
|
||||
throw exception;
|
||||
}
|
||||
|
||||
class ExceptionListener {
|
||||
|
||||
@Event
|
||||
void onExceptionEvent(ExceptionEvent exceptionEvent) {
|
||||
assertEquals(bus, exceptionEvent.getEventBus());
|
||||
assertEquals(event, exceptionEvent.getEvent());
|
||||
assertEquals(exception, exceptionEvent.getCause());
|
||||
exceptionEventHandled = true;
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,73 @@
|
||||
package dev.kske.eventbus.core;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.*;
|
||||
|
||||
import org.junit.jupiter.api.*;
|
||||
|
||||
/**
|
||||
* Tests nested event dispatches.
|
||||
*
|
||||
* @author Kai S. K. Engelbart
|
||||
* @since 1.2.0
|
||||
*/
|
||||
public class NestedTest {
|
||||
|
||||
EventBus bus;
|
||||
boolean nestedHit;
|
||||
|
||||
/**
|
||||
* Constructs an event bus and registers this test instance as an event listener.
|
||||
*
|
||||
* @since 1.2.0
|
||||
*/
|
||||
@BeforeEach
|
||||
public void registerListener() {
|
||||
bus = new EventBus();
|
||||
bus.registerListener(this);
|
||||
}
|
||||
|
||||
/**
|
||||
* Dispatches a simple event, which should in turn cause a string to be dispatched as a nested
|
||||
* event. If the corresponding handler sets {@link #nestedHit} to {@code true}, the test is
|
||||
* successful.
|
||||
*
|
||||
* @since 1.2.0
|
||||
*/
|
||||
@Test
|
||||
public void testNestedDispatch() {
|
||||
bus.dispatch(new SimpleEvent());
|
||||
assertTrue(nestedHit);
|
||||
}
|
||||
|
||||
/**
|
||||
* Dispatches a string as a nested event and cancels the current dispatch afterwards.
|
||||
*
|
||||
* @since 1.2.0
|
||||
*/
|
||||
@Event(SimpleEvent.class)
|
||||
void onSimpleEvent() {
|
||||
bus.dispatch("Nested event");
|
||||
bus.cancel();
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets {@link #nestedHit} to {@code true} indicating that nested dispatches work.
|
||||
*
|
||||
* @since 1.2.0
|
||||
*/
|
||||
@Event(String.class)
|
||||
void onString() {
|
||||
nestedHit = true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Fails the test if an exception is caused during the dispatch.
|
||||
*
|
||||
* @param e the event containing the exception
|
||||
* @since 1.2.0
|
||||
*/
|
||||
@Event
|
||||
void onException(ExceptionEvent e) {
|
||||
fail("Exception during dispatch", e.getCause());
|
||||
}
|
||||
}
|
||||
@@ -11,7 +11,7 @@
|
||||
<parent>
|
||||
<groupId>dev.kske</groupId>
|
||||
<artifactId>event-bus</artifactId>
|
||||
<version>1.0.0</version>
|
||||
<version>1.1.0</version>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
|
||||
@@ -63,6 +63,10 @@ public class EventProcessor extends AbstractProcessor {
|
||||
else
|
||||
pass = true;
|
||||
|
||||
// Warn the user about unused return values
|
||||
if (useParameter && eventHandler.getReturnType().getKind() != TypeKind.VOID)
|
||||
warning(eventHandler, "Unused return value");
|
||||
|
||||
// Abort checking if the handler signature is incorrect
|
||||
if (!pass)
|
||||
continue;
|
||||
@@ -80,14 +84,56 @@ public class EventProcessor extends AbstractProcessor {
|
||||
}
|
||||
}
|
||||
|
||||
// Check for handlers for abstract types that aren't polymorphic
|
||||
// Get the listener containing this handler
|
||||
TypeElement listener = (TypeElement) eventHandler.getEnclosingElement();
|
||||
|
||||
// Default properties
|
||||
boolean defPolymorphic = false;
|
||||
int defPriority = 100;
|
||||
|
||||
// Listener-level polymorphism
|
||||
Polymorphic listenerPolymorphic = listener.getAnnotation(Polymorphic.class);
|
||||
boolean hasListenerPolymorphic = listenerPolymorphic != null;
|
||||
|
||||
// Listener-level priority
|
||||
Priority listenerPriority = listener.getAnnotation(Priority.class);
|
||||
boolean hasListenerPriority = listenerPriority != null;
|
||||
|
||||
// Effective polymorphism
|
||||
boolean polymorphic =
|
||||
hasListenerPolymorphic ? listenerPolymorphic.value() : defPolymorphic;
|
||||
boolean hasHandlerPolymorphic = eventHandler.getAnnotation(Polymorphic.class) != null;
|
||||
if (hasHandlerPolymorphic)
|
||||
polymorphic = eventHandler.getAnnotation(Polymorphic.class).value();
|
||||
|
||||
// Effective priority
|
||||
int priority = hasListenerPriority ? listenerPriority.value() : defPriority;
|
||||
boolean hasHandlerPriority = eventHandler.getAnnotation(Priority.class) != null;
|
||||
if (hasHandlerPriority)
|
||||
priority = eventHandler.getAnnotation(Priority.class).value();
|
||||
|
||||
// Detect useless polymorphism redefinition
|
||||
if (hasListenerPolymorphic && hasHandlerPolymorphic
|
||||
&& listenerPolymorphic.value() == polymorphic)
|
||||
warning(eventHandler, "@Polymorphism is already defined at listener level");
|
||||
|
||||
// Detect useless priority redefinition
|
||||
if (hasListenerPriority && hasHandlerPriority && listenerPriority.value() == priority)
|
||||
warning(eventHandler, "@Priority is already defined at the listener level");
|
||||
|
||||
// Detect missing or useless @Polymorphic
|
||||
Element eventElement = ((DeclaredType) eventType).asElement();
|
||||
if (eventHandler.getAnnotation(Polymorphic.class) == null
|
||||
&& (eventElement.getKind() == ElementKind.INTERFACE
|
||||
|| eventElement.getModifiers().contains(Modifier.ABSTRACT))) {
|
||||
|
||||
// Check for handlers for abstract types that aren't polymorphic
|
||||
if (!polymorphic && (eventElement.getKind() == ElementKind.INTERFACE
|
||||
|| eventElement.getModifiers().contains(Modifier.ABSTRACT)))
|
||||
warning(eventHandler,
|
||||
"Parameter should be instantiable or handler should use @Polymorphic");
|
||||
}
|
||||
|
||||
// Check for handlers for final types that are polymorphic
|
||||
else if (polymorphic && eventElement.getModifiers().contains(Modifier.FINAL))
|
||||
warning(eventHandler,
|
||||
"@Polymorphic should be removed as parameter cannot be subclassed");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
45
pom.xml
45
pom.xml
@@ -5,11 +5,11 @@
|
||||
|
||||
<groupId>dev.kske</groupId>
|
||||
<artifactId>event-bus</artifactId>
|
||||
<version>1.0.0</version>
|
||||
<version>1.1.0</version>
|
||||
<packaging>pom</packaging>
|
||||
|
||||
<name>Event Bus</name>
|
||||
<description>An event handling framework for Java utilizing annotations.</description>
|
||||
<description>An event handling library for Java utilizing annotations.</description>
|
||||
<url>https://git.kske.dev/kske/event-bus</url>
|
||||
|
||||
<modules>
|
||||
@@ -19,8 +19,10 @@
|
||||
|
||||
<licenses>
|
||||
<license>
|
||||
<name>GNU General Public License Version 3</name>
|
||||
<url>http://www.gnu.org/licenses/gpl.txt</url>
|
||||
<name>Apache License, Version 2.0</name>
|
||||
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
|
||||
<distribution>repo</distribution>
|
||||
<comments>A business-friendly OSS license</comments>
|
||||
</license>
|
||||
</licenses>
|
||||
|
||||
@@ -38,6 +40,19 @@
|
||||
</developer>
|
||||
</developers>
|
||||
|
||||
<contributors>
|
||||
<contributor>
|
||||
<name>Leon Hofmeister</name>
|
||||
<email>leon@kske.dev</email>
|
||||
<url>https://git.kske.dev/delvh</url>
|
||||
<roles>
|
||||
<role>qa</role>
|
||||
<role>tester</role>
|
||||
</roles>
|
||||
<timezone>Europe/Berlin</timezone>
|
||||
</contributor>
|
||||
</contributors>
|
||||
|
||||
<scm>
|
||||
<connection>scm:git:https://git.kske.dev/kske/event-bus.git</connection>
|
||||
<developerConnection>scm:git:ssh://git@git.kske.dev:420/kske/event-bus.git</developerConnection>
|
||||
@@ -105,6 +120,28 @@
|
||||
</goals>
|
||||
</execution>
|
||||
</executions>
|
||||
|
||||
<!-- Support JDK-style Javadoc tags -->
|
||||
<configuration>
|
||||
<tags>
|
||||
<tag>
|
||||
<name>apiNote</name>
|
||||
<placement>a</placement>
|
||||
<head>API Note:</head>
|
||||
</tag>
|
||||
<tag>
|
||||
<name>implSpec</name>
|
||||
<placement>a</placement>
|
||||
<head>Implementation Requirements:</head>
|
||||
</tag>
|
||||
<tag>
|
||||
<name>implNote</name>
|
||||
<placement>a</placement>
|
||||
<head>Implementation Note:</head>
|
||||
</tag>
|
||||
</tags>
|
||||
</configuration>
|
||||
|
||||
</plugin>
|
||||
|
||||
<!-- GPG sign JAR -->
|
||||
|
||||
Reference in New Issue
Block a user