279 lines
8.6 KiB
Java
Executable File
279 lines
8.6 KiB
Java
Executable File
package envoy.server.data;
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import java.time.Instant;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.EntityTransaction;
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import javax.persistence.Persistence;
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import envoy.data.User.UserStatus;
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import envoy.server.net.ConnectionManager;
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/**
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* Project: <strong>envoy-server-standalone</strong><br>
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* File: <strong>PersistenceManager.java</strong><br>
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* Created: <strong>1 Jan 2020</strong><br>
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*
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* @author Leon Hofmeister
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* @author Maximilian Käfer
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public class PersistenceManager {
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private final EntityManager entityManager = Persistence.createEntityManagerFactory("envoy").createEntityManager();
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private final EntityTransaction transaction = entityManager.getTransaction();
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private static final PersistenceManager persistenceManager = new PersistenceManager();
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/**
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* Creates the singleton instance of the @link{PersistenceManager}.
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*
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* @since Envoy Server Standalone v0.1-alpha
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*/
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private PersistenceManager() {
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Runtime.getRuntime().addShutdownHook(new Thread(() -> {
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transaction.begin();
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ConnectionManager.getInstance()
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.getOnlineUsers()
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.stream()
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.map(this::getUserByID)
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.forEach(user -> { user.setStatus(UserStatus.OFFLINE); user.setLastSeen(Instant.now()); entityManager.merge(user); });
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transaction.commit();
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}));
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}
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/**
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* @return the {@link PersistenceManager} singleton
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public static PersistenceManager getInstance() { return persistenceManager; }
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/**
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* Adds a {@link Contact} to the database.
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*
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* @param contact the {@link Contact} to add to the database
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void addContact(Contact contact) { persist(contact); }
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/**
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* Adds a {@link Message} to the database.
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*
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* @param message the {@link Message} to add to the database
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void addMessage(Message message) { persist(message); }
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/**
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* Adds a {@link ConfigItem} to the database.
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*
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* @param configItem the {@link ConfigItem} to add to the database
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void addConfigItem(ConfigItem configItem) { persist(configItem); }
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/**
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* Updates a {@link Contact} in the database
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*
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* @param contact the {@link Contact} to add to the database
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void updateContact(Contact contact) { merge(contact); }
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/**
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* Updates a {@link Message} in the database.
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*
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* @param message the message to update
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void updateMessage(Message message) { merge(message); }
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/**
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* Updates a {@link ConfigItem} in the database.
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*
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* @param configItem the configItem to update
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void updateConfigItem(ConfigItem configItem) { merge(configItem); }
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/**
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* Deletes a {@link Contact} in the database.
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*
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* @param contact the {@link Contact} to delete
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void deleteContact(Contact contact) { remove(contact); }
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/**
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* Deletes a {@link Message} in the database.
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*
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* @param message the {@link Message} to delete
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void deleteMessage(Message message) { remove(message); }
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/**
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* Searches for a {@link User} with a specific ID.
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*
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* @param id the id to search for
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* @return the user with the specified ID or {@code null} if none was found
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public User getUserByID(long id) { return entityManager.find(User.class, id); }
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/**
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* Searches for a {@link Group} with a specific ID.
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*
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* @param id the id to search for
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* @return the group with the specified ID or {@code null} if none was found
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* @since Envoy Server Standalone v0.1-beta
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*/
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public Group getGroupByID(long id) { return entityManager.find(Group.class, id); }
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/**
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* Searches for a {@link Contact} with a specific ID.
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*
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* @param id the id to search for
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* @return the contact with the specified ID or {@code null} if none was found
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* @since Envoy Server Standalone v0.1-beta
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*/
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public Contact getContactByID(long id) { return entityManager.find(Contact.class, id); }
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/**
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* Searched for a {@link User} with a specific name.
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*
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* @param name the name of the user
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* @return the user with the specified name
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public User getUserByName(String name) {
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return (User) entityManager.createNamedQuery(User.findByName).setParameter("name", name).getSingleResult();
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}
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/**
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* Searched for a {@link Group} with a specific name.
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*
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* @param name the name of the group
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* @return the group with the specified name
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public Group getGroupByName(String name) {
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return (Group) entityManager.createNamedQuery(Group.findByName).setParameter("name", name).getSingleResult();
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}
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/**
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* Searches for a {@link Message} with a specific id.
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*
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* @param id the id to search for
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* @return the message with the specified ID or {@code null} if none is found
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public Message getMessageByID(long id) { return entityManager.find(Message.class, id); }
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/**
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* @param key the name of this {@link ConfigItem}
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* @return the {@link ConfigItem} with the given name
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public ConfigItem getConfigItemByID(String key) { return entityManager.find(ConfigItem.class, key); }
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/**
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* Returns all messages received while being offline or the ones that have
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* changed.
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*
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* @param user the user who wants to receive his unread messages
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* @param lastSync the time stamp of the last synchronization
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* @return all messages that the client does not yet have (unread messages)
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* @since Envoy Server Standalone v0.2-beta
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*/
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public List<Message> getPendingMessages(User user, Instant lastSync) {
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return entityManager.createNamedQuery(Message.getPending).setParameter("user", user).setParameter("lastSeen", lastSync).getResultList();
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}
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/**
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* Returns all groupMessages received while being offline or the ones that have
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* changed.
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*
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* @param user the user who wants to receive his unread groupMessages
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* @param lastSync the time stamp of the last synchronization
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* @return all groupMessages that the client does not yet have (unread
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* groupMessages)
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* @since Envoy Server Standalone v0.2-beta
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*/
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public List<GroupMessage> getPendingGroupMessages(User user, Instant lastSync) {
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return entityManager.createNamedQuery(GroupMessage.getPendingGroupMsg)
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.setParameter("userId", user.getID())
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.setParameter("lastSeen", lastSync)
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.getResultList();
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}
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/**
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* Searches for users matching a search phrase. Contacts of the attached user
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* and the attached user is ignored.
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*
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* @param searchPhrase the search phrase
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* @param userId the ID of the user in whose context the search is
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* performed
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* @return a list of all users who matched the criteria
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public List<User> searchUsers(String searchPhrase, long userId) {
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return entityManager.createNamedQuery(User.searchByName)
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.setParameter("searchPhrase", searchPhrase + "%")
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.setParameter("context", getUserByID(userId))
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.getResultList();
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}
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/**
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* Adds a contact to the contact list of another contact and vice versa.
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*
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* @param contactID1 the ID of the first contact
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* @param contactID2 the ID of the second contact
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void addContactBidirectional(long contactID1, long contactID2) {
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// Get users by ID
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Contact c1 = getContactByID(contactID1);
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Contact c2 = getContactByID(contactID2);
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// Add users to each others contact lists
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c1.getContacts().add(c2);
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c2.getContacts().add(c1);
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// Synchronize changes with the database
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transaction.begin();
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entityManager.merge(c1);
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entityManager.merge(c2);
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transaction.commit();
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}
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/**
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* @param user the User whose contacts should be retrieved
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* @return the contacts of this User
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public List<User> getContacts(User user) {
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return entityManager.createNamedQuery(User.findContacts).setParameter("user", user).getResultList();
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}
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private void persist(Object obj) {
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transaction.begin();
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entityManager.persist(obj);
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transaction.commit();
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}
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private void merge(Object obj) {
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transaction.begin();
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entityManager.merge(obj);
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transaction.commit();
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}
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private void remove(Object obj) {
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transaction.begin();
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entityManager.remove(obj);
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transaction.commit();
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}
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}
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