Moved PersistenceManager into data package, refactored transaction use

src/main/java/envoy/server/Startup.java

@@ -7,7 +7,7 @@ import java.util.Set;
 import com.jenkov.nioserver.Server;
 
 import envoy.server.data.ConfigItem;
-import envoy.server.database.PersistenceManager;
+import envoy.server.data.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectMessageProcessor;
 import envoy.server.net.ObjectMessageReader;

src/main/java/envoy/server/data/Message.java

@@ -5,7 +5,6 @@ import java.util.Date;
 import javax.persistence.*;
 
 import envoy.data.MessageBuilder;
-import envoy.server.database.PersistenceManager;
 
 /**
  * This class serves as a way to let Hibernate communicate with the server

src/main/java/envoy/server/data/PersistenceManager.java

@@ -1,4 +1,4 @@
-package envoy.server.database;
+package envoy.server.data;
 
 import java.util.Date;
 import java.util.List;
@@ -8,9 +8,6 @@ import javax.persistence.EntityTransaction;
 import javax.persistence.Persistence;
 
 import envoy.data.User.UserStatus;
-import envoy.server.data.ConfigItem;
-import envoy.server.data.Message;
-import envoy.server.data.User;
 import envoy.server.net.ConnectionManager;
 
 /**
@@ -34,13 +31,13 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	private PersistenceManager() {
-		transaction.begin();
 		Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+			transaction.begin();
 			ConnectionManager.getInstance()
 				.getOnlineUsers()
 				.stream()
 				.map(this::getUserById)
-				.forEach(user -> { user.setStatus(UserStatus.OFFLINE); user.setLastSeen(new Date()); updateUser(user); });
+				.forEach(user -> { user.setStatus(UserStatus.OFFLINE); user.setLastSeen(new Date()); entityManager.merge(user); });
 			transaction.commit();
 		}));
 	}
@@ -54,13 +51,10 @@ public class PersistenceManager {
 	/**
 	 * Adds a {@link User} to the database.
 	 *
-	 * @param User the {@link User} to add to the database
+	 * @param user the {@link User} to add to the database
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void addUser(User User) {
-		entityManager.persist(User);
-		entityManager.flush();
-	}
+	public void addUser(User user) { persist(user); }
 
 	/**
 	 * Adds a {@link Message} to the database.
@@ -68,10 +62,7 @@ public class PersistenceManager {
 	 * @param message the {@link Message} to add to the database
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void addMessage(Message message) {
-		entityManager.persist(message);
-		entityManager.flush();
-	}
+	public void addMessage(Message message) { persist(message); }
 
 	/**
 	 * Adds a {@link ConfigItem} to the database.
@@ -79,10 +70,7 @@ public class PersistenceManager {
 	 * @param configItem the {@link ConfigItem} to add to the database
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void addConfigItem(ConfigItem configItem) {
-		entityManager.persist(configItem);
-		entityManager.flush();
-	}
+	public void addConfigItem(ConfigItem configItem) { persist(configItem); }
 
 	/**
 	 * Updates a {@link User} in the database
@@ -90,10 +78,7 @@ public class PersistenceManager {
 	 * @param user the {@link User} to add to the database
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void updateUser(User user) {
-		entityManager.merge(user);
-		entityManager.flush();
-	}
+	public void updateUser(User user) { merge(user); }
 
 	/**
 	 * Updates a {@link Message} in the database.
@@ -101,10 +86,7 @@ public class PersistenceManager {
 	 * @param message the message to update
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void updateMessage(Message message) {
-		entityManager.merge(message);
-		entityManager.flush();
-	}
+	public void updateMessage(Message message) { merge(message); }
 
 	/**
 	 * Updates a {@link ConfigItem} in the database.
@@ -112,10 +94,7 @@ public class PersistenceManager {
 	 * @param configItem the configItem to update
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void updateConfigItem(ConfigItem configItem) {
-		entityManager.merge(configItem);
-		entityManager.flush();
-	}
+	public void updateConfigItem(ConfigItem configItem) { merge(configItem); }
 
 	/**
 	 * Deletes a {@link User} in the database.
@@ -123,10 +102,7 @@ public class PersistenceManager {
 	 * @param user the {@link User} to delete
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void deleteUser(User user) {
-		entityManager.remove(user);
-		entityManager.flush();
-	}
+	public void deleteUser(User user) { remove(user); }
 
 	/**
 	 * Deletes a {@link Message} in the database.
@@ -134,10 +110,7 @@ public class PersistenceManager {
 	 * @param message the {@link Message} to delete
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void deleteMessage(Message message) {
-		entityManager.remove(message);
-		entityManager.flush();
-	}
+	public void deleteMessage(Message message) { remove(message); }
 
 	/**
 	 * Searches for a {@link User} with a specific id.
@@ -211,12 +184,20 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public void addContact(long userId1, long userId2) {
+		
+		// Get users by ID
 		User	u1	= getUserById(userId1);
 		User	u2	= getUserById(userId2);
+		
+		// Add users to each others contact lists
 		u1.getContacts().add(u2);
 		u2.getContacts().add(u1);
-		updateUser(u1);
-		updateUser(u2);
+		
+		// Synchronize changes with the database
+		transaction.begin();
+		entityManager.merge(u1);
+		entityManager.merge(u2);
+		transaction.commit();
 	}
 
 	/**
@@ -227,4 +208,22 @@ public class PersistenceManager {
 	public List<User> getContacts(User user) {
 		return entityManager.createNamedQuery("getContactsOfUser").setParameter("user", user).getResultList();
 	}
+
+	private void persist(Object obj) {
+		transaction.begin();
+		entityManager.persist(obj);
+		transaction.commit();
+	}
+
+	private void merge(Object obj) {
+		transaction.begin();
+		entityManager.merge(obj);
+		transaction.commit();
+	}
+
+	private void remove(Object obj) {
+		transaction.begin();
+		entityManager.remove(obj);
+		transaction.commit();
+	}
 }

src/main/java/envoy/server/net/ConnectionManager.java

@@ -5,7 +5,7 @@ import java.util.*;
 import com.jenkov.nioserver.ISocketIdListener;
 
 import envoy.data.User.UserStatus;
-import envoy.server.database.PersistenceManager;
+import envoy.server.data.PersistenceManager;
 import envoy.server.processors.UserStatusChangeProcessor;
 
 /**

src/main/java/envoy/server/processors/ContactOperationProcessor.java

@@ -6,7 +6,7 @@ import java.util.Arrays;
 import envoy.data.Contacts;
 import envoy.event.ContactOperationEvent;
 import envoy.server.ObjectProcessor;
-import envoy.server.database.PersistenceManager;
+import envoy.server.data.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectWriteProxy;
 

src/main/java/envoy/server/processors/ContactsRequestEventProcessor.java

@@ -7,8 +7,8 @@ import envoy.data.Contacts;
 import envoy.event.ContactSearchRequest;
 import envoy.event.ContactSearchResult;
 import envoy.server.ObjectProcessor;
+import envoy.server.data.PersistenceManager;
 import envoy.server.data.User;
-import envoy.server.database.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectWriteProxy;
 

src/main/java/envoy/server/processors/IdGeneratorRequestProcessor.java

@@ -6,7 +6,7 @@ import envoy.data.IdGenerator;
 import envoy.event.IdGeneratorRequest;
 import envoy.server.ObjectProcessor;
 import envoy.server.data.ConfigItem;
-import envoy.server.database.PersistenceManager;
+import envoy.server.data.PersistenceManager;
 import envoy.server.net.ObjectWriteProxy;
 
 /**

src/main/java/envoy/server/processors/LoginCredentialProcessor.java

@@ -14,7 +14,7 @@ import envoy.data.User.UserStatus;
 import envoy.event.HandshakeRejectionEvent;
 import envoy.server.ObjectProcessor;
 import envoy.server.data.Message;
-import envoy.server.database.PersistenceManager;
+import envoy.server.data.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectWriteProxy;
 

src/main/java/envoy/server/processors/MessageProcessor.java

@@ -6,7 +6,7 @@ import java.util.Date;
 import envoy.data.Message;
 import envoy.event.MessageStatusChangeEvent;
 import envoy.server.ObjectProcessor;
-import envoy.server.database.PersistenceManager;
+import envoy.server.data.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectWriteProxy;
 

src/main/java/envoy/server/processors/MessageStatusChangeProcessor.java

@@ -6,7 +6,7 @@ import envoy.data.Message.MessageStatus;
 import envoy.event.MessageStatusChangeEvent;
 import envoy.exception.EnvoyException;
 import envoy.server.ObjectProcessor;
-import envoy.server.database.PersistenceManager;
+import envoy.server.data.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectWriteProxy;
 

src/main/java/envoy/server/processors/UserStatusChangeProcessor.java

@@ -5,8 +5,8 @@ import java.io.IOException;
 import envoy.data.User.UserStatus;
 import envoy.event.UserStatusChangeEvent;
 import envoy.server.ObjectProcessor;
+import envoy.server.data.PersistenceManager;
 import envoy.server.data.User;
-import envoy.server.database.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectWriteProxy;