Listeners for subscription changes.

api/net/sf/briar/api/db/DatabaseComponent.java

@@ -48,11 +48,11 @@ public interface DatabaseComponent {
 	/** Waits for any open transactions to finish and closes the database. */
 	void close() throws DbException;
 
-	/** Adds a listener to be notified when new messages are available. */
-	void addListener(MessageListener m);
+	/** Adds a listener to be notified when database events occur. */
+	void addListener(DatabaseListener d);
 
 	/** Removes a listener. */
-	void removeListener(MessageListener m);
+	void removeListener(DatabaseListener d);
 
 	/**
 	 * Adds a new contact to the database with the given transport details and

api/net/sf/briar/api/db/DatabaseListener.java

@@ -0,0 +1,13 @@
+package net.sf.briar.api.db;
+
+/** An interface for receiving notifications when database events occur. */
+public interface DatabaseListener {
+
+	static enum Event {
+		MESSAGES_ADDED,
+		SUBSCRIPTIONS_UPDATED,
+		TRANSPORTS_UPDATED
+	};
+
+	void eventOccurred(Event e);
+}

api/net/sf/briar/api/db/MessageListener.java

@@ -1,10 +0,0 @@
-package net.sf.briar.api.db;
-
-/**
- * An interface for receiving notifications when the database may have new
- * messages available.
- */
-public interface MessageListener {
-
-	void messagesAdded();
-}