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 package com.sun.grizzly.filter;

 import com.sun.grizzly.Context;

 import com.sun.grizzly.Controller;

 import com.sun.grizzly.ProtocolFilter;

 import com.sun.grizzly.util.WorkerThread;

 import java.io.IOException;

 import java.net.SocketAddress;

 import java.nio.ByteBuffer;

 import java.util.logging.Level;

 /**

  * Simple echo filter

  *

  * @author Alexey Stashok

  */

 public class EchoAsyncWriteQueueFilter implements ProtocolFilter {

     public boolean execute(Context ctx) throws IOException {

         final WorkerThread workerThread = ((WorkerThread)Thread.currentThread());

         ByteBuffer buffer = workerThread.getByteBuffer();

         buffer.flip();

         if (buffer.hasRemaining()) {

             // Depending on protocol perform echo

             try {

                 if (ctx.getProtocol() == Controller.Protocol.TCP) { // TCP case

                     ctx.getAsyncQueueWritable().writeToAsyncQueue(buffer, null, null, true);

                 } else if (ctx.getProtocol() == Controller.Protocol.UDP) {  // UDP case

                     SocketAddress address = (SocketAddress) 

                             ctx.getAttribute(ReadFilter.UDP_SOCKETADDRESS);

                     ctx.getAsyncQueueWritable().writeToAsyncQueue(address, 

                             buffer, null, null, true);

                 }

             } catch (IOException ex) {

                 // Store incoming data in byte[]

                 byte[] data = new byte[buffer.remaining()];

                 int position = buffer.position();

                 buffer.get(data);

                 buffer.position(position);

                 Controller.logger().log(Level.WARNING, 

                         "Exception. Echo \"" + new String(data) + "\"");

                 throw ex;

             }

         }

         buffer.clear();

         return false;

     }

     public boolean postExecute(Context ctx) throws IOException {

         return true;

     }

 }