Let the plugin determine whether to flush the output stream after each

packet.

api/net/sf/briar/api/plugins/Plugin.java

@@ -28,9 +28,8 @@ public interface Plugin {
 	long getPollingInterval();
 
 	/**
-	 * Attempts to establish connections using the current transport and
-	 * configuration properties, and passes any created connections to the
-	 * callback.
+	 * Attempts to establish connections to all contacts, passing any created
+	 * connections to the callback.
 	 */
 	void poll();
 

api/net/sf/briar/api/protocol/ProtocolWriter.java

@@ -4,6 +4,8 @@ import java.io.IOException;
 
 public interface ProtocolWriter {
 
+	void flush() throws IOException;
+
 	int getMaxBatchesForAck(long capacity);
 
 	int getMaxMessagesForOffer(long capacity);

api/net/sf/briar/api/protocol/ProtocolWriterFactory.java

@@ -4,5 +4,5 @@ import java.io.OutputStream;
 
 public interface ProtocolWriterFactory {
 
-	ProtocolWriter createProtocolWriter(OutputStream out);
+	ProtocolWriter createProtocolWriter(OutputStream out, boolean flush);
 }

api/net/sf/briar/api/transport/BatchTransportWriter.java

@@ -14,6 +14,11 @@ public interface BatchTransportWriter {
 	/** Returns an output stream for writing to the transport. */
 	OutputStream getOutputStream();
 
+	/**
+	 * Returns true if the output stream should be flushed after each packet.
+	 */
+	boolean shouldFlush();
+
 	/**
 	 * Closes the writer and disposes of any associated resources. The
 	 * argument indicates whether the writer is being closed because of an

api/net/sf/briar/api/transport/StreamTransportConnection.java

@@ -17,6 +17,11 @@ public interface StreamTransportConnection {
 	/** Returns an output stream for writing to the connection. */
 	OutputStream getOutputStream() throws IOException;
 
+	/**
+	 * Returns true if the output stream should be flushed after each packet.
+	 */
+	boolean shouldFlush();
+
 	/**
 	 * Closes the connection and disposes of any associated resources. The
 	 * first argument indicates whether the connection is being closed because