Implemented Groups on the database and implemented MSChange management

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

@@ -2,7 +2,14 @@ package envoy.server.data;
 
 import java.util.Set;
 
-import javax.persistence.*;
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.Inheritance;
+import javax.persistence.InheritanceType;
+import javax.persistence.ManyToMany;
 
 /**
  * This class acts as a superclass for all contacts, being {@link User}s and
@@ -16,12 +23,12 @@ import javax.persistence.*;
  * @since Envoy Server Standalone v0.1-alpha
  */
 
-@MappedSuperclass
-// TODO add queries
+@Entity
+@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
 public abstract class Contact {
 
 	@Id
-	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	@GeneratedValue(strategy = GenerationType.TABLE)
 	protected long		id;
 	protected String	name;
 

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

@@ -2,7 +2,9 @@ package envoy.server.data;
 
 import java.util.stream.Collectors;
 
-import javax.persistence.*;
+import javax.persistence.Entity;
+import javax.persistence.NamedQuery;
+import javax.persistence.Table;
 
 import envoy.data.User;
 
@@ -21,7 +23,7 @@ import envoy.data.User;
  */
 @Entity
 @Table(name = "groups")
-@NamedQueries({ @NamedQuery(query = "SELECT g FROM Group g WHERE g.name = :name", name = "getGroupByName") })
+@NamedQuery(query = "SELECT g FROM Group g WHERE g.name = :name", name = "getGroupByName")
 public class Group extends Contact {
 
 	/**

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

@@ -6,7 +6,6 @@ import javax.persistence.CascadeType;
 import javax.persistence.Entity;
 import javax.persistence.Id;
 import javax.persistence.ManyToOne;
-import javax.persistence.NamedQueries;
 import javax.persistence.NamedQuery;
 import javax.persistence.Table;
 import javax.persistence.Temporal;
@@ -29,11 +28,11 @@ import envoy.data.MessageBuilder;
  */
 @Entity
 @Table(name = "messages")
-@NamedQueries(
-	{ @NamedQuery(
-		query = "SELECT m FROM Message m WHERE m.recipient =:recipient AND m.status = envoy.data.Message$MessageStatus.SENT",
-		name = "getUnreadMessages"
-	) }
+@NamedQuery(
+	query = "SELECT m FROM Message m WHERE (m.recipient = :user AND m.status = envoy.data.Message$MessageStatus.SENT) "
+			+ "OR (m.sender = :user) AND ((m.status = envoy.data.Message$MessageStatus.RECEIVED) AND (m.receivedDate > :lastSeen)"
+			+ "OR (m.status = envoy.data.Message$MessageStatus.READ) AND (m.readDate > :lastSeen))",
+	name = "getPendingMessages"
 )
 public class Message {
 

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

@@ -190,14 +190,18 @@ public class PersistenceManager {
 	public ConfigItem getConfigItemById(String key) { return entityManager.find(ConfigItem.class, key); }
 
 	/**
-	 * Returns all messages received while being offline.
+	 * Returns all messages received while being offline or the ones that have
+	 * changed.
 	 *
-	 * @param user - the user who wants to receive his unread messages
+	 * @param user the user who wants to receive his unread messages
 	 * @return all messages that the client does not yet have (unread messages)
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public List<Message> getUnreadMessages(User user) {
-		return entityManager.createNamedQuery("getUnreadMessages").setParameter("recipient", user).getResultList();
+	public List<Message> getPendingMessages(User user) {
+		return entityManager.createNamedQuery("getPendingMessages")
+			.setParameter("user", user)
+			.setParameter("lastSeen", user.getLastSeen())
+			.getResultList();
 	}
 
 	/**

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

@@ -1,7 +1,11 @@
 package envoy.server.processors;
 
 import java.io.IOException;
-import java.util.*;
+import java.util.Arrays;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.InputMismatchException;
+import java.util.List;
 import java.util.stream.Collectors;
 
 import javax.persistence.NoResultException;
@@ -11,6 +15,7 @@ import envoy.data.Message.MessageStatus;
 import envoy.data.User;
 import envoy.data.User.UserStatus;
 import envoy.event.HandshakeRejectionEvent;
+import envoy.event.MessageStatusChangeEvent;
 import envoy.server.data.Message;
 import envoy.server.data.PersistenceManager;
 import envoy.server.net.ConnectionManager;
@@ -61,13 +66,19 @@ public class LoginCredentialProcessor implements ObjectProcessor<LoginCredential
 		System.out.println("Sending contacts...");
 		writeProxy.write(socketID, contacts);
 		System.out.println("Acquiring pending messages for the client...");
-		List<Message> pendingMessages = PersistenceManager.getInstance().getUnreadMessages(user);
+		List<Message> pendingMessages = PersistenceManager.getInstance().getPendingMessages(user);
 		for (Message msg : pendingMessages) {
+			if (msg.getStatus() == MessageStatus.SENT) {
 				System.out.println("Sending message " + msg.toCommonMessage());
 				writeProxy.write(socketID, msg.toCommonMessage());
 				msg.setReceivedDate(new Date());
 				msg.setStatus(MessageStatus.RECEIVED);
 				PersistenceManager.getInstance().updateMessage(msg);
+			} else {
+				var evt = new MessageStatusChangeEvent(msg.toCommonMessage());
+				System.out.println("Sending messageStatusChangeEvent " + evt);
+				writeProxy.write(socketID, evt);
+			}
 		}
 	}