| /** |
| * |
| * Copyright 2005-2006 The Apache Software Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.activeio.packet.async.vmpipe; |
| |
| import java.io.IOException; |
| import java.io.InterruptedIOException; |
| |
| import org.apache.activeio.packet.EOSPacket; |
| import org.apache.activeio.packet.Packet; |
| import org.apache.activeio.packet.async.AsyncChannel; |
| import org.apache.activeio.packet.async.AsyncChannelListener; |
| |
| import edu.emory.mathcs.backport.java.util.concurrent.Semaphore; |
| import edu.emory.mathcs.backport.java.util.concurrent.TimeUnit; |
| |
| /** |
| * Used to connect the bottom ends of two Async channel stacks. |
| * |
| */ |
| final public class VMPipeAsyncChannelPipe { |
| |
| final PipeChannel leftChannel = new PipeChannel(); |
| final PipeChannel rightChannel = new PipeChannel(); |
| |
| final public static class PipeChannel implements AsyncChannel { |
| |
| private PipeChannel sibiling; |
| private AsyncChannelListener channelListener; |
| private final Semaphore runMutext = new Semaphore(0); |
| private boolean disposed; |
| private boolean running; |
| |
| public PipeChannel() { |
| } |
| |
| public void setAsyncChannelListener(AsyncChannelListener channelListener) { |
| this.channelListener = channelListener; |
| } |
| public AsyncChannelListener getAsyncChannelListener() { |
| return channelListener; |
| } |
| |
| public void write(Packet packet) throws IOException { |
| if( disposed ) |
| throw new IOException("Conneciton closed."); |
| sibiling.onPacket(packet, WAIT_FOREVER_TIMEOUT); |
| } |
| |
| private void onPacket(Packet packet, long timeout) throws IOException { |
| try { |
| if( timeout == NO_WAIT_TIMEOUT ) { |
| if( !runMutext.tryAcquire(0, TimeUnit.MILLISECONDS) ) |
| return; |
| } else if( timeout == WAIT_FOREVER_TIMEOUT ) { |
| runMutext.acquire(); |
| } else { |
| if( !runMutext.tryAcquire(timeout, TimeUnit.MILLISECONDS) ) |
| return; |
| } |
| } catch (InterruptedException e) { |
| throw new InterruptedIOException(); |
| } |
| try { |
| if( disposed ) { |
| throw new IOException("Peer connection closed."); |
| } |
| channelListener.onPacket(packet); |
| } finally { |
| runMutext.release(); |
| } |
| } |
| |
| public void flush() throws IOException { |
| } |
| |
| public void start() throws IOException { |
| if(running) |
| return; |
| if( channelListener==null ) |
| throw new IOException("channelListener has not been set."); |
| running=true; |
| runMutext.release(); |
| } |
| |
| public void stop() throws IOException { |
| if(!running) |
| return; |
| try { |
| runMutext.tryAcquire(5, TimeUnit.SECONDS); |
| running=false; |
| } catch (InterruptedException e) { |
| throw new InterruptedIOException(); |
| } |
| } |
| |
| public void dispose() { |
| if( disposed ) |
| return; |
| |
| if( running && channelListener!=null ) { |
| this.channelListener.onPacketError(new IOException("Pipe closed.")); |
| running=false; |
| } |
| disposed = true; |
| runMutext.release(); |
| |
| try { |
| // Inform the peer of the End Of Stream if he's listening. |
| sibiling.onPacket(EOSPacket.EOS_PACKET, NO_WAIT_TIMEOUT); |
| } catch (IOException e) { |
| } |
| } |
| |
| public PipeChannel getSibiling() { |
| return sibiling; |
| } |
| public void setSibiling(PipeChannel sibiling) { |
| this.sibiling = sibiling; |
| } |
| |
| public Object getAdapter(Class target) { |
| if( target.isAssignableFrom(getClass()) ) { |
| return this; |
| } |
| return null; |
| } |
| |
| public String getId() { |
| return "0x"+Integer.toHexString(System.identityHashCode(this)); |
| } |
| |
| public String toString() { |
| return "Pipe Channel from "+getId()+" to "+sibiling.getId(); |
| } |
| } |
| |
| public VMPipeAsyncChannelPipe() { |
| leftChannel.setSibiling(rightChannel); |
| rightChannel.setSibiling(leftChannel); |
| } |
| |
| public AsyncChannel getLeftAsyncChannel() { |
| return leftChannel; |
| } |
| |
| public AsyncChannel getRightAsyncChannel() { |
| return rightChannel; |
| } |
| } |