/**
*
* Copyright 2004 Hiram Chirino
*
* 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.activeio.adapter;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.URI;
import org.activeio.AcceptListener;
import org.activeio.AsynchChannelServer;
import org.activeio.Channel;
import org.activeio.ChannelServer;
import org.activeio.SynchChannelServer;
import EDU.oswego.cs.dl.util.concurrent.LinkedQueue;
/**
* Adapts a {@see org.activeio.AsynchChannelServer} so that it provides an
* {@see org.activeio.SynchChannelServer} interface.
*
* This object buffers asynchronous accepts from the {@see org.activeio.AsynchChannelServer}
* abs buffers them in a {@see EDU.oswego.cs.dl.util.concurrent.Channel} util the client accepts the
* connection.
*
* @version $Revision$
*/
final public class AsynchToSynchChannelServerAdapter implements SynchChannelServer, AcceptListener {
private final AsynchChannelServer asynchChannelServer;
private final EDU.oswego.cs.dl.util.concurrent.Channel acceptBuffer;
static public SynchChannelServer adapt(ChannelServer channel) {
return adapt(channel, new LinkedQueue());
}
static public SynchChannelServer adapt(ChannelServer channel, EDU.oswego.cs.dl.util.concurrent.Channel upPacketChannel) {
// It might not need adapting
if( channel instanceof SynchChannelServer ) {
return (SynchChannelServer) channel;
}
// Can we just just undo the adaptor
if( channel.getClass() == SynchToAsynchChannelAdapter.class ) {
return ((SynchToAsynchChannelServerAdapter)channel).getSynchChannelServer();
}
return new AsynchToSynchChannelServerAdapter((AsynchChannelServer)channel, upPacketChannel);
}
/**
* @deprecated {@see #adapt(ChannelServer)}
*/
public AsynchToSynchChannelServerAdapter(AsynchChannelServer asynchChannelServer) {
this(asynchChannelServer,new LinkedQueue());
}
/**
* @deprecated {@see #adapt(ChannelServer, EDU.oswego.cs.dl.util.concurrent.Channel)}
*/
public AsynchToSynchChannelServerAdapter(AsynchChannelServer asynchChannelServer, EDU.oswego.cs.dl.util.concurrent.Channel acceptBuffer) {
this.asynchChannelServer = asynchChannelServer;
this.acceptBuffer=acceptBuffer;
this.asynchChannelServer.setAcceptListener(this);
}
/**
* @see org.activeio.SynchChannelServer#accept(long)
*/
public org.activeio.Channel accept(long timeout) throws IOException {
try {
Object o;
if( timeout == NO_WAIT_TIMEOUT ) {
o = acceptBuffer.poll(0);
} else if( timeout == WAIT_FOREVER_TIMEOUT ) {
o = acceptBuffer.take();
} else {
o = acceptBuffer.poll(timeout);
}
if( o == null )
return null;
if( o instanceof Channel )
return (Channel)o;
Throwable e = (Throwable)o;
throw (IOException)new IOException("Asynch error occured: "+e).initCause(e);
} catch (InterruptedException e) {
throw new InterruptedIOException(e.getMessage());
}
}
/**
* @see org.activeio.Disposable#dispose()
*/
public void dispose() {
asynchChannelServer.dispose();
}
/**
* @see org.activeio.Service#start()
*/
public void start() throws IOException {
asynchChannelServer.start();
}
/**
* @see org.activeio.Service#stop(long)
*/
public void stop(long timeout) throws IOException {
asynchChannelServer.stop(timeout);
}
public URI getBindURI() {
return asynchChannelServer.getBindURI();
}
public URI getConnectURI() {
return asynchChannelServer.getConnectURI();
}
/**
* @see org.activeio.AcceptListener#onAccept(org.activeio.Channel)
*/
public void onAccept(org.activeio.Channel channel) {
try {
acceptBuffer.put(channel);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
/**
* @see org.activeio.AcceptListener#onAcceptError(java.io.IOException)
*/
public void onAcceptError(IOException error) {
try {
acceptBuffer.put(error);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
public AsynchChannelServer getAsynchChannelServer() {
return asynchChannelServer;
}
public Object narrow(Class target) {
if( target.isAssignableFrom(getClass()) ) {
return this;
}
return asynchChannelServer.narrow(target);
}
public String toString() {
return asynchChannelServer.toString();
}
}