Moved classes from messaging package to sync package.

briar-api/src/org/briarproject/api/sync/MessagingSession.java

@@ -0,0 +1,18 @@
+package org.briarproject.api.sync;
+
+import java.io.IOException;
+
+public interface MessagingSession {
+
+	/**
+	 * Runs the session. This method returns when there are no more packets to
+	 * send or receive, or when the {@link #interrupt()} method has been called.
+	 */
+	void run() throws IOException;
+
+	/**
+	 * Interrupts the session, causing the {@link #run()} method to return at
+	 * the next opportunity.
+	 */
+	void interrupt();
+}