Adding user to their own contacts, reusing one database transaction

Fixes #15

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

@@ -44,6 +44,10 @@ public class Startup {
 
 		server.start();
 		server.getSocketProcessor().registerSocketIdListener(ConnectionManager.getInstance());
+
+		System.out.println("Press any key to stop the server...");
+		System.in.read();
+		System.exit(0);
 	}
 
 	private static void initializeCurrentMessageId() {

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

@@ -3,6 +3,7 @@ package envoy.server.database;
 import java.util.List;
 
 import javax.persistence.EntityManager;
+import javax.persistence.EntityTransaction;
 import javax.persistence.Persistence;
 
 import envoy.server.data.ConfigItem;
@@ -19,6 +20,9 @@ import envoy.server.data.User;
  */
 public class PersistenceManager {
 
+	private final EntityManager		entityManager	= Persistence.createEntityManagerFactory("envoy").createEntityManager();
+	private final EntityTransaction	transaction		= entityManager.getTransaction();
+
 	private static final PersistenceManager persistenceManager = new PersistenceManager();
 
 	/**
@@ -26,7 +30,10 @@ public class PersistenceManager {
 	 *
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	private PersistenceManager() {}
+	private PersistenceManager() {
+		transaction.begin();
+		Runtime.getRuntime().addShutdownHook(new Thread(() -> transaction.commit()));
+	}
 
 	/**
 	 * @return the {@link PersistenceManager} singleton
@@ -34,8 +41,6 @@ public class PersistenceManager {
 	 */
 	public static PersistenceManager getPersistenceManager() { return persistenceManager; }
 
-	private EntityManager entityManager = Persistence.createEntityManagerFactory("envoy").createEntityManager();
-
 	/**
 	 * Adds a {@link User} to the database.
 	 *
@@ -43,9 +48,8 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public void addUser(User User) {
-		entityManager.getTransaction().begin();
 		entityManager.persist(User);
-		entityManager.getTransaction().commit();
+		entityManager.flush();
 	}
 
 	/**
@@ -55,9 +59,8 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public void addMessage(Message message) {
-		entityManager.getTransaction().begin();
 		entityManager.persist(message);
-		entityManager.getTransaction().commit();
+		entityManager.flush();
 	}
 
 	/**
@@ -67,9 +70,8 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public void addConfigItem(ConfigItem configItem) {
-		entityManager.getTransaction().begin();
 		entityManager.persist(configItem);
-		entityManager.getTransaction().commit();
+		entityManager.flush();
 	}
 
 	/**
@@ -79,9 +81,8 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public void updateUser(User user) {
-		entityManager.getTransaction().begin();
 		entityManager.merge(user);
-		entityManager.getTransaction().commit();
+		entityManager.flush();
 	}
 
 	/**
@@ -91,9 +92,8 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public void updateMessage(Message message) {
-		entityManager.getTransaction().begin();
 		entityManager.merge(message);
-		entityManager.getTransaction().commit();
+		entityManager.flush();
 	}
 
 	/**
@@ -103,9 +103,8 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public void updateConfigItem(ConfigItem configItem) {
-		entityManager.getTransaction().begin();
 		entityManager.merge(configItem);
-		entityManager.getTransaction().commit();
+		entityManager.flush();
 	}
 
 	/**
@@ -115,9 +114,8 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public void deleteUser(User user) {
-		entityManager.getTransaction().begin();
 		entityManager.remove(user);
-		entityManager.getTransaction().commit();
+		entityManager.flush();
 	}
 
 	/**
@@ -127,9 +125,8 @@ public class PersistenceManager {
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public void deleteMessage(Message message) {
-		entityManager.getTransaction().begin();
 		entityManager.remove(message);
-		entityManager.getTransaction().commit();
+		entityManager.flush();
 	}
 
 	/**

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

@@ -33,6 +33,7 @@ public class ObjectMessageProcessor implements IMessageProcessor {
 	 */
 	public ObjectMessageProcessor(Set<ObjectProcessor<?>> processors) { this.processors = processors; }
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public void process(Message message, WriteProxy writeProxy) {
 		try (ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(message.sharedArray, message.offset + 4, message.length - 4))) {

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

@@ -54,6 +54,7 @@ public class LoginCredentialProcessor implements ObjectProcessor<LoginCredential
 		// Create contacts
 		Contacts contacts = new Contacts(user.getId(),
 				user.getContacts().stream().map(envoy.server.data.User::toCommonUser).collect(Collectors.toList()));
+		contacts.getContacts().add(user.toCommonUser());
 
 		// Complete handshake
 		System.out.println("Sending user...");