zdm/envoy
zdm/envoy
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Merge pull request #10 from informatik-ag-ngl/f/message_processing

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Implemented the processing of messages sent by clients
This commit is contained in:
Kai S. K. Engelbart 2020-01-15 06:38:22 +01:00 committed by GitHub
commit d396572d18
23 changed files with 537 additions and 123 deletions
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22
.classpath
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@ -6,11 +6,6 @@
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="src" output="target/test-classes" path="src/test/java">
<attributes>
<attribute name="optional" value="true"/>
@ -18,12 +13,6 @@
<attribute name="test" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
<attributes>
<attribute name="maven.pomderived" value="true"/>
<attribute name="test" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
<attributes>
<attribute name="maven.pomderived" value="true"/>
@ -35,5 +24,16 @@
</attributes>
</classpathentry>
<classpathentry kind="src" path="/envoy-common"/>
<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
<attributes>
<attribute name="maven.pomderived" value="true"/>
<attribute name="test" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="output" path="target/classes"/>
</classpath>

11
.project
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@ -5,11 +5,21 @@
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.wst.common.project.facet.core.builder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.wst.validation.validationbuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.m2e.core.maven2Builder</name>
<arguments>
@ -19,5 +29,6 @@
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.m2e.core.maven2Nature</nature>
<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
</natures>
</projectDescription>

7
.settings/org.eclipse.jdt.core.prefs
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@ -1,7 +1,14 @@
eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.8
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
org.eclipse.jdt.core.compiler.release=disabled

3
.settings/org.eclipse.jpt.core.prefs Normal file
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@ -0,0 +1,3 @@
eclipse.preferences.version=1
org.eclipse.jpt.core.platform=hibernate2_1
org.eclipse.jpt.jpa.core.discoverAnnotatedClasses=true

7
.settings/org.eclipse.wst.common.project.facet.core.prefs.xml Normal file
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@ -0,0 +1,7 @@
<root>
<facet id="jpt.jpa">
<node name="libprov">
<attribute name="provider-id" value="jpa-no-op-library-provider"/>
</node>
</facet>
</root>

5
.settings/org.eclipse.wst.common.project.facet.core.xml Normal file
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@ -0,0 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<installed facet="java" version="1.8"/>
<installed facet="jpt.jpa" version="2.1"/>
</faceted-project>

3
.settings/org.hibernate.eclipse.console.prefs Normal file
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@ -0,0 +1,3 @@
default.configuration=envoy-server-standalone
eclipse.preferences.version=1
hibernate3.enabled=true

20
pom.xml
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@ -17,22 +17,34 @@
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<repositories>
<repository>
<id>jitpack.io</id>
<url>https://jitpack.io</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>informatik-ag-ngl</groupId>
<groupId>com.github.informatik-ag-ngl</groupId>
<artifactId>envoy-common</artifactId>
<version>0.2-alpha</version>
<version>develop-SNAPSHOT</version><!-- <version>0.2-alpha</version> -->
</dependency>
<dependency>
<groupId>informatik-ag-ngl</groupId>
<groupId>com.github.informatik-ag-ngl</groupId>
<artifactId>java-nio-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<version>master-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.10.Final</version>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.9</version>
</dependency>
</dependencies>
<build>

79
src/main/java/envoy/server/ConnectionManager.java Normal file
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@ -0,0 +1,79 @@
package envoy.server;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import com.jenkov.nioserver.ISocketIdListener;
/**
* Project: <strong>envoy-server-standalone</strong><br>
* File: <strong>ConnectionManager.java</strong><br>
* Created: <strong>03.01.2020</strong><br>
*
* @author Kai S. K. Engelbart
* @since Envoy Server Standalone v0.1-alpha
*/
public class ConnectionManager implements ISocketIdListener {
/**
* Contains all socket IDs that have not yet performed a handshake / acquired
* their corresponding user ID.
*
* @since Envoy Server Standalone v0.1-alpha
*/
private Set<Long> pendingSockets = new HashSet<>();
/**
* Contains all socket IDs that have acquired a user ID as keys to these IDs.
*
* @since Envoy Server Standalone v0.1-alpha
*/
private Map<Long, Long> sockets = new HashMap<>();
private static ConnectionManager connectionManager = new ConnectionManager();
private ConnectionManager() {}
/**
* @return a singleton instance of this object
* @since Envoy Server Standalone v0.1-alpha
*/
public static ConnectionManager getInstance() { return connectionManager; }
@Override
public void socketCancelled(long socketId) {
if (!pendingSockets.remove(socketId))
sockets.entrySet().stream().filter(e -> e.getValue() == socketId).forEach(e -> sockets.remove(e.getValue()));
}
@Override
public void socketRegistered(long socketId) { pendingSockets.add(socketId); }
/**
* Associates a socket ID with a user ID.
*
* @param userId the user ID
* @param socketId the socket ID
* @since Envoy Server Standalone v0.1-alpha
*/
public void registerUser(long userId, long socketId) {
sockets.put(userId, socketId);
pendingSockets.remove(userId);
}
/**
* @param userId the ID of the user registered at the a socket
* @return the ID of the socket
* @since Envoy Server Standalone v0.1-alpha
*/
public long getSocketId(long userId) { return sockets.get(userId); }
/**
* @param userId the ID of the user to check for
* @return {@code true} if the user is online
* @since Envoy Server Standalone v0.1-alpha
*/
public boolean isOnline(long userId) { return sockets.containsKey(userId); }
}

29
src/main/java/envoy/server/LoginCredentialProcessor.java
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@ -1,29 +0,0 @@
package envoy.server;
import envoy.data.LoginCredentials;
import envoy.data.User;
/**
* This {@link ObjectProcessor} handles {@link LoginCredentials}.<br>
* <br>
* Project: <strong>envoy-server-standalone</strong><br>
* File: <strong>LoginCredentialProcessor.java</strong><br>
* Created: <strong>30.12.2019</strong><br>
*
* @author Kai S. K. Engelbart
* @since Envoy Server Standalone v0.1-alpha
*/
public class LoginCredentialProcessor implements ObjectProcessor<LoginCredentials, User> {
// TODO: Acquire user IDs from database
private static long currentUserId = 1;
@Override
public Class<LoginCredentials> getInputClass() { return LoginCredentials.class; }
@Override
public User process(LoginCredentials input) {
System.out.println("Received login credentials " + input);
return new User(currentUserId++, input.getName());
}
}

22
src/main/java/envoy/server/MessageProcessor.java
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@ -1,22 +0,0 @@
package envoy.server;
import envoy.data.Message;
/**
* This {@link ObjectProcessor} handles incoming {@link Message}s.<br>
* <br>
* Project: <strong>envoy-server-standalone</strong><br>
* File: <strong>MessageProcessor.java</strong><br>
* Created: <strong>30.12.2019</strong><br>
*
* @author Kai S. K. Engelbart
* @since Envoy Server Standalone v0.1-alpha
*/
public class MessageProcessor implements ObjectProcessor<Message, Void> {
@Override
public Class<Message> getInputClass() { return Message.class; }
@Override
public Void process(Message input) { return null; }
}

17
src/main/java/envoy/server/ObjectProcessor.java
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@ -1,5 +1,9 @@
package envoy.server;
import java.io.IOException;
import envoy.server.net.ObjectWriteProxy;
/**
* This interface defines methods for processing objects of a specific
* type incoming from a client.<br>
@ -10,21 +14,22 @@ package envoy.server;
*
* @author Kai S. K. Engelbart
* @param <T> type of the request object
* @param <U> type of the response object
* @since Envoy Server Standalone v0.1-alpha
*/
public interface ObjectProcessor<T, U> {
public interface ObjectProcessor<T> {
/**
* @return the Class of the request object
* @return the class of the request object
* @since Envoy Server Standalone v0.1-alpha
*/
Class<T> getInputClass();
/**
* @param input the request object
* @return the response object
* @param input the request object
* @param socketId the ID of the socket from which the object was received
* @param writeProxy the object that allows writing to a client
* @throws IOException if something went wrong during processing
* @since Envoy Server Standalone v0.1-alpha
*/
U process(T input);
void process(T input, long socketId, ObjectWriteProxy writeProxy) throws IOException;
}

11
src/main/java/envoy/server/Startup.java
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@ -6,6 +6,12 @@ import java.util.Set;
import com.jenkov.nioserver.Server;
import envoy.server.net.ObjectMessageProcessor;
import envoy.server.net.ObjectMessageReader;
import envoy.server.processors.EventProcessor;
import envoy.server.processors.LoginCredentialProcessor;
import envoy.server.processors.MessageProcessor;
/**
* Starts the server.<br>
* <br>
@ -26,10 +32,13 @@ public class Startup {
* @since Envoy Server Standalone v0.1-alpha
*/
public static void main(String[] args) throws IOException {
Set<ObjectProcessor<?, ?>> processors = new HashSet<>();
Set<ObjectProcessor<?>> processors = new HashSet<>();
processors.add(new LoginCredentialProcessor());
processors.add(new MessageProcessor());
processors.add(new EventProcessor());
// new PersistenceManager();
Server server = new Server(8080, () -> new ObjectMessageReader(), new ObjectMessageProcessor(processors));
server.start();
server.getSocketProcessor().registerSocketIdListener(ConnectionManager.getInstance());
}
}

43
src/main/java/envoy/server/data/Message.java
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@ -4,6 +4,7 @@ import java.util.Date;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
@ -11,6 +12,7 @@ import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import envoy.data.MessageBuilder;
import envoy.server.database.PersistenceManager;
/**
* This class serves as a way to let Hibernate communicate with the server
@ -28,22 +30,34 @@ import envoy.data.MessageBuilder;
@Entity
@Table(name = "messages")
@NamedQueries(
{ @NamedQuery(query = "SELECT m FROM Message m WHERE m.recipient =:recipient AND m.state = 1", name = "getUnreadMessages"), @NamedQuery(
query = "SELECT m FROM Message m WHERE m.sender =:sender AND m.state = :state",
name = "find read messages"//TODO do we need this namedQuery?
), @NamedQuery(query = "SELECT m FROM Message m WHERE m.id = :messageId", name = "get message") }//TODO do we need this namedQuery?
{ @NamedQuery(
query = "SELECT m FROM Message m WHERE m.recipient =:recipient AND m.status = envoy.data.Message$MessageStatus.SENT",
name = "getUnreadMessages"
), @NamedQuery(
query = "SELECT m FROM Message m WHERE m.sender =:sender AND m.status = :status",
name = "find read messages"// TODO do we need this namedQuery?
), @NamedQuery(query = "SELECT m FROM Message m WHERE m.id = :messageId", name = "getMessageById") }
)
public class Message {
@Id
private long id;
private User sender, recipient;
private long id;
@ManyToOne
private User sender;
@ManyToOne
private User recipient;
@Temporal(TemporalType.TIMESTAMP)
private Date creationDate;
private Date creationDate;
@Temporal(TemporalType.TIMESTAMP)
private Date receivedDate;
private Date receivedDate;
@Temporal(TemporalType.TIMESTAMP)
private Date readDate;
private Date readDate;
private envoy.data.Message.MessageStatus status;
private String text;
private byte[] attachment;
@ -62,9 +76,14 @@ public class Message {
* @since Envoy Server Standalone v0.1-alpha
*/
public Message(envoy.data.Message message) {
id = message.getId();
status = message.getStatus();
text = message.getText();
PersistenceManager persMan = PersistenceManager.getPersistenceManager();
id = message.getId();
status = message.getStatus();
text = message.getText();
creationDate = message.getCreationDate();
sender = persMan.getUserById(message.getSenderId());
recipient = persMan.getUserById(message.getRecipientId());
// attachment = message.getAttachment().toByteArray();DOES NOT WORK YET
}
/**

40
src/main/java/envoy/server/data/User.java
View File

@ -3,6 +3,7 @@ package envoy.server.data;
import java.util.Date;
import java.util.List;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
@ -27,18 +28,47 @@ import javax.persistence.TemporalType;
*/
@Entity
@Table(name = "users")
@NamedQuery(query = "SELECT u FROM DBUser u WHERE u.id = :id", name = "getUserById")
@NamedQuery(query = "SELECT u FROM User u WHERE u.id = :id", name = "getUserById")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
private String name;
private byte[] passwordHash;
private long id;
private String name;
private byte[] passwordHash;
@Temporal(TemporalType.TIMESTAMP)
private Date lastSeen;
private envoy.data.User.UserStatus status;
private List<User> contacts;
@ElementCollection
private List<User> contacts;
/**
* Creates an instance of @link{User}.
* Solely used for JPA/ Hibernate
*
* @since Envoy Server Standalone v0.1-alpha
*/
public User() {}
/**
* Creates an instance of @link{User}.
*
* @param user the {@link envoy.data.User} to convert
* @since Envoy Server Standalone v0.1-alpha
*/
public User(envoy.data.User user) {
id = user.getId();
name = user.getName();
status = user.getStatus();
}
/**
* @return a database {@link User} converted into an {@link envoy.data.User}
* @since Envoy Server Standalone v0.1-alpha
*/
public envoy.data.User toCommonUser() { return new envoy.data.User(this.id, this.name); }
/**
* @return the id of a {link envoy.data.User}

28
src/main/java/envoy/server/database/PersistenceManager.java
View File

@ -20,6 +20,21 @@ import envoy.server.data.User;
*/
public class PersistenceManager {
private static final PersistenceManager persistenceManager = new PersistenceManager();
/**
* Creates the singleton instance of the @link{PersistenceManager}.
*
* @since Envoy Server Standalone v0.1-alpha
*/
private PersistenceManager() {}
/**
* @return the {@link PersistenceManager} singleton
* @since Envoy Server Standalone v0.1-alpha
*/
public static PersistenceManager getPersistenceManager() { return persistenceManager; }
private EntityManager entityManager = Persistence.createEntityManagerFactory("envoy").createEntityManager();
/**
@ -55,7 +70,7 @@ public class PersistenceManager {
public void updateMessage(Message message) { entityManager.unwrap(Session.class).merge(message); }
/**
* Searches for a user with a specific id.
* Searches for a {@link User} with a specific id.
*
* @param id - the id to search for
* @return the user with the specified id
@ -63,6 +78,17 @@ public class PersistenceManager {
*/
public User getUserById(long id) { return (User) entityManager.createNamedQuery("getUserById").setParameter("id", id).getSingleResult(); }
/**
* Searches for a {@link Message} with a specific id.
*
* @param id - the id to search for
* @return the message with the specified id
* @since Envoy Server Standalone v0.1-alpha
*/
public Message getMessageById(long id) {
return (Message) entityManager.createNamedQuery("getMessageById").setParameter("id", id).getSingleResult();
}
/**
* Returns all messages received while being offline.
*

30
src/main/java/envoy/server/ObjectMessageProcessor.java → src/main/java/envoy/server/net/ObjectMessageProcessor.java
View File

@ -1,16 +1,16 @@
package envoy.server;
package envoy.server.net;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Set;
import com.jenkov.nioserver.IMessageProcessor;
import com.jenkov.nioserver.Message;
import com.jenkov.nioserver.WriteProxy;
import envoy.server.ObjectProcessor;
/**
* Handles incoming objects.<br>
* <br>
@ -23,7 +23,7 @@ import com.jenkov.nioserver.WriteProxy;
*/
public class ObjectMessageProcessor implements IMessageProcessor {
private final Set<ObjectProcessor<?, ?>> processors;
private final Set<ObjectProcessor<?>> processors;
/**
* The constructor to set the {@link ObjectProcessor}s.
@ -31,7 +31,7 @@ public class ObjectMessageProcessor implements IMessageProcessor {
* @param processors the {@link ObjectProcessor} to set
* @since Envoy Server Standalone v0.1-alpha
*/
public ObjectMessageProcessor(Set<ObjectProcessor<?, ?>> processors) { this.processors = processors; }
public ObjectMessageProcessor(Set<ObjectProcessor<?>> processors) { this.processors = processors; }
@SuppressWarnings("unchecked")
@Override
@ -42,22 +42,10 @@ public class ObjectMessageProcessor implements IMessageProcessor {
// Process object
processors.stream().filter(p -> p.getInputClass().isInstance(obj)).forEach((@SuppressWarnings("rawtypes") ObjectProcessor p) -> {
Object responseObj = p.process(p.getInputClass().cast(obj));
if (responseObj != null) {
// Create message targeted at the client
Message response = writeProxy.getMessage();
response.socketId = message.socketId;
// Serialize object to byte array
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try (ObjectOutputStream oout = new ObjectOutputStream(baos)) {
oout.writeObject(responseObj);
} catch (IOException e) {
e.printStackTrace();
}
byte[] objBytes = baos.toByteArray();
response.writeToMessage(objBytes);
writeProxy.enqueue(response);
try {
p.process(p.getInputClass().cast(obj), message.socketId, new ObjectWriteProxy(writeProxy));
} catch (IOException e) {
e.printStackTrace();
}
});
} catch (IOException | ClassNotFoundException e) {

16
src/main/java/envoy/server/ObjectMessageReader.java → src/main/java/envoy/server/net/ObjectMessageReader.java
View File

@ -1,14 +1,13 @@
package envoy.server;
package envoy.server.net;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import com.jenkov.nioserver.IMessageReader;
import com.jenkov.nioserver.Message;
import com.jenkov.nioserver.MessageBuffer;
import com.jenkov.nioserver.Socket;
import com.jenkov.nioserver.*;
import envoy.util.SerializationUtils;
/**
* This {@link IMessageReader} decodes serialized Java objects.<br>
@ -26,11 +25,6 @@ public class ObjectMessageReader implements IMessageReader {
private Message nextMessage;
private MessageBuffer messageBuffer;
private int fromByteArray(byte[] bytes, int offset) {
return ((bytes[offset] & 0xFF) << 24) | ((bytes[offset + 1] & 0xFF) << 16) | ((bytes[offset + 2] & 0xFF) << 8)
| ((bytes[offset + 3] & 0xFF) << 0);
}
@Override
public List<Message> getMessages() { return completeMessages; }
@ -54,7 +48,7 @@ public class ObjectMessageReader implements IMessageReader {
// Get message length
if (nextMessage.length - nextMessage.offset < 4) return;
int length = fromByteArray(nextMessage.sharedArray, nextMessage.offset) + 4;
int length = SerializationUtils.bytesToInt(nextMessage.sharedArray, nextMessage.offset) + 4;
if (nextMessage.length - nextMessage.offset >= length) {
Message message = messageBuffer.getMessage();

53
src/main/java/envoy/server/net/ObjectWriteProxy.java Normal file
View File

@ -0,0 +1,53 @@
package envoy.server.net;
import java.io.IOException;
import com.jenkov.nioserver.Message;
import com.jenkov.nioserver.WriteProxy;
import envoy.util.SerializationUtils;
/**
* This class defines methods to send an object to a client.<br>
* <br>
* Project: <strong>envoy-server-standalone</strong><br>
* File: <strong>ObjectWriteProxy.java</strong><br>
* Created: <strong>04.01.2020</strong><br>
*
* @author Kai S. K. Engelbart
* @since Envoy Server Standalone v0.1-alpha
*/
public class ObjectWriteProxy {
private final WriteProxy writeProxy;
/**
* Creates an instance of @link{ObjectWriteProxy}.
*
* @param writeProxy the {@link WriteProxy} to write objects to another client
* @since Envoy Server Standalone v0.1-alpha
*/
public ObjectWriteProxy(WriteProxy writeProxy) { this.writeProxy = writeProxy; }
/**
* @param recipientSocketId the socket id of the recipient
* @param obj the object to return to the client
* @throws IOException if the serialization of the object failed
* @since Envoy Server Standalone v0.1-alpha
*/
public void write(long recipientSocketId, Object obj) throws IOException {
// Create message targeted at the client
Message response = writeProxy.getMessage();
response.socketId = recipientSocketId;
// Serialize object to byte array
byte[] objBytes = SerializationUtils.writeToByteArray(obj);
// Acquire object length in bytes
byte[] objLen = SerializationUtils.intToBytes(objBytes.length);
response.writeToMessage(objLen);
response.writeToMessage(objBytes);
writeProxy.enqueue(response);
}
}

77
src/main/java/envoy/server/processors/EventProcessor.java Normal file
View File

@ -0,0 +1,77 @@
package envoy.server.processors;
import java.io.IOException;
import envoy.data.Message;
import envoy.data.Message.MessageStatus;
import envoy.event.Event;
import envoy.event.MessageStatusChangeEvent;
import envoy.exception.EnvoyException;
import envoy.server.ConnectionManager;
import envoy.server.ObjectProcessor;
import envoy.server.database.PersistenceManager;
import envoy.server.net.ObjectWriteProxy;
/**
* Project: <strong>envoy-server-standalone</strong><br>
* File: <strong>EventProcessor.java</strong><br>
* Created: <strong>10 Jan 2020</strong><br>
*
* @author Leon Hofmeister
* @since Envoy Server Standalone v0.1-alpha
*/
public class EventProcessor implements ObjectProcessor<Event<?>> {
private Event<?> event;
/**
* Creates an instance of @link{EventProcessor}.
*
* @since Envoy Server Standalone v0.1-alpha
*/
public EventProcessor() {}
@SuppressWarnings("unchecked")
@Override
public Class<Event<?>> getInputClass() { return (Class<Event<?>>) event.getClass(); }
@Override
public void process(Event<?> input, long socketId, ObjectWriteProxy writeProxy) throws IOException {
event = input;
if (event instanceof MessageStatusChangeEvent) try {
applyMessageStatusChange((MessageStatusChangeEvent) event, writeProxy);
} catch (EnvoyException e) {
e.printStackTrace();
}
}
/**
* Redirects messageStatus changes to the database and to the recipient of the
* {@link Message}.
*
* @param event the {@link MessageStatusChangeEvent} to adjust
* @throws EnvoyException if the {@link Message} has an invalid state
* @since Envoy Server Standalone v0.1-alpha
*/
private void applyMessageStatusChange(MessageStatusChangeEvent event, ObjectWriteProxy writeProxy) throws EnvoyException {
if (!(event.get() == MessageStatus.READ))// check that no invalid MessageStatuses are sent
throw new EnvoyException("Message" + event.getId() + "has an invalid status");
ConnectionManager conMan = ConnectionManager.getInstance();
PersistenceManager perMan = PersistenceManager.getPersistenceManager();
envoy.server.data.Message msg = perMan.getMessageById(event.getId());
msg.setStatus(event.get());
msg.setReadDate(event.getDate());
if (conMan.isOnline(msg.getRecipient().getId())) try {
writeProxy.write(conMan.getSocketId(msg.getRecipient().getId()), event);
} catch (IOException e) {
System.err.println("Recipient online. Failed to send MessageStatusChangedEvent at message" + event.getId());
e.printStackTrace();
}
perMan.updateMessage(msg);
}
}

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src/main/java/envoy/server/processors/LoginCredentialProcessor.java Normal file
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package envoy.server.processors;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import envoy.data.Contacts;
import envoy.data.LoginCredentials;
import envoy.data.Message.MessageStatus;
import envoy.data.User;
import envoy.server.ConnectionManager;
import envoy.server.ObjectProcessor;
import envoy.server.data.Message;
import envoy.server.database.PersistenceManager;
import envoy.server.net.ObjectWriteProxy;
/**
* This {@link ObjectProcessor} handles {@link LoginCredentials}.<br>
* <br>
* Project: <strong>envoy-server-standalone</strong><br>
* File: <strong>LoginCredentialProcessor.java</strong><br>
* Created: <strong>30.12.2019</strong><br>
*
* @author Kai S. K. Engelbart
* @since Envoy Server Standalone v0.1-alpha
*/
public class LoginCredentialProcessor implements ObjectProcessor<LoginCredentials> {
// TODO: Acquire user IDs from database
private static long currentUserId = 1;
@Override
public Class<LoginCredentials> getInputClass() { return LoginCredentials.class; }
@Override
public void process(LoginCredentials input, long socketId, ObjectWriteProxy writeProxy) throws IOException {
System.out.println(String.format("Received login credentials %s from socket ID %d", input, socketId));
// Create user
User user = new User(currentUserId++, input.getName());
ConnectionManager.getInstance().registerUser(socketId, user.getId());
// Create contacts
Contacts contacts = new Contacts(user.getId(), new ArrayList<>());
// Complete handshake
System.out.println("Sending user...");
writeProxy.write(socketId, user);
System.out.println("Sending contacts...");
writeProxy.write(socketId, contacts);
System.out.println("Sending unread messages and updating them in the database...");
List<Message> pendingMessages = PersistenceManager.getPersistenceManager().getUnreadMessages(new envoy.server.data.User(user));
pendingMessages.forEach((msg) -> {
msg.setReceivedDate(new Date());
msg.setStatus(MessageStatus.RECEIVED);
PersistenceManager.getPersistenceManager().updateMessage(msg);
});
writeProxy.write(socketId, pendingMessages);
}
}

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src/main/java/envoy/server/processors/MessageProcessor.java Normal file
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package envoy.server.processors;
import java.io.IOException;
import java.util.Date;
import envoy.data.Message;
import envoy.event.MessageStatusChangeEvent;
import envoy.server.ConnectionManager;
import envoy.server.ObjectProcessor;
import envoy.server.database.PersistenceManager;
import envoy.server.net.ObjectWriteProxy;
/**
* This {@link ObjectProcessor} handles incoming {@link Message}s.<br>
* <br>
* Project: <strong>envoy-server-standalone</strong><br>
* File: <strong>MessageProcessor.java</strong><br>
* Created: <strong>30.12.2019</strong><br>
*
* @author Kai S. K. Engelbart
* @since Envoy Server Standalone v0.1-alpha
*/
public class MessageProcessor implements ObjectProcessor<Message> {
@Override
public Class<Message> getInputClass() { return Message.class; }
@Override
public void process(Message message, long socketId, ObjectWriteProxy writeProxy) {
ConnectionManager connectionManager = ConnectionManager.getInstance();
message.nextStatus();
if (connectionManager.isOnline(message.getRecipientId())) try {// if recipient is online, he receives the message directly
writeProxy.write(connectionManager.getSocketId(message.getRecipientId()), message);
} catch (IOException e) {
System.err.println("Recipient online. Failed to send message" + message.getId());
e.printStackTrace();
}
try {// sender receives confirmation that the server received the message
writeProxy.write(connectionManager.getSocketId(message.getSenderId()),
new MessageStatusChangeEvent(message.getId(), message.getStatus(), new Date()));
} catch (IOException e) {
e.printStackTrace();
}
PersistenceManager.getPersistenceManager().addMessage(new envoy.server.data.Message(message));
}
}

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src/main/resources/META-INF/persistence.xml Normal file
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<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="envoy"
transaction-type="RESOURCE_LOCAL">
<properties>
<property name="javax.persistence.jdbc.driver"
value="org.postgresql.Driver" /> <!-- DB Driver -->
<property name="javax.persistence.jdbc.url"
value="jdbc:postgresql://localhost/envoy" /> <!-- BD Mane -->
<property name="javax.persistence.jdbc.user" value="envoy" /> <!-- DB User -->
<property name="javax.persistence.jdbc.password"
value="envoy" /> <!-- DB Password -->
<property name="hibernate.dialect"
value="org.hibernate.dialect.PostgreSQL95Dialect" /> <!-- DB Dialect -->
<property name="hibernate.hbm2ddl.auto" value="update" /> <!-- create / create-drop / update -->
<property name="hibernate.show_sql" value="true" /> <!-- Show SQL in console -->
<property name="hibernate.format_sql" value="true" /> <!-- Show SQL formatted -->
</properties>
</persistence-unit>
</persistence>