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/**
* Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.signal;
import org.eclipse.net4j.buffer.BufferInputStream;
import org.eclipse.net4j.buffer.BufferOutputStream;
import org.eclipse.net4j.util.io.ExtendedDataInputStream;
import org.eclipse.net4j.util.io.ExtendedDataOutputStream;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
/**
* @author Eike Stepper
*/
public abstract class RequestWithConfirmation<RESULT> extends SignalActor
{
private RESULT result;
/**
* @since 2.0
*/
public RequestWithConfirmation(SignalProtocol<?> protocol, short id, String name)
{
super(protocol, id, name);
}
/**
* @since 2.0
*/
public RequestWithConfirmation(SignalProtocol<?> protocol, short signalID)
{
super(protocol, signalID);
}
/**
* @since 2.0
*/
public RequestWithConfirmation(SignalProtocol<?> protocol, Enum<?> literal)
{
super(protocol, literal);
}
/**
* @since 2.0
*/
public Future<RESULT> sendAsync()
{
ExecutorService executorService = getAsyncExecutorService();
return executorService.submit(new Callable<RESULT>()
{
public RESULT call() throws Exception
{
return doSend(getProtocol().getTimeout());
}
});
}
/**
* @since 2.0
*/
public RESULT send() throws Exception, RemoteException
{
return doSend(getProtocol().getTimeout());
}
/**
* @since 2.0
*/
public RESULT send(long timeout) throws Exception, RemoteException
{
return doSend(timeout);
}
RESULT doSend(long timeout) throws Exception
{
result = null;
getProtocol().startSignal(this, timeout);
return result;
}
/**
* @since 2.0
*/
protected ExecutorService getAsyncExecutorService()
{
return getProtocol().getExecutorService();
}
@Override
void doExecute(BufferInputStream in, BufferOutputStream out) throws Exception
{
doOutput(out);
doInput(in);
}
protected abstract void requesting(ExtendedDataOutputStream out) throws Exception;
/**
* <b>Important Note:</b> The confirmation must not be empty, i.e. the stream must be used at least to read a
* <code>boolean</code>. Otherwise synchronization problems will result!
*/
protected abstract RESULT confirming(ExtendedDataInputStream in) throws Exception;
@Override
void doExtendedOutput(ExtendedDataOutputStream out) throws Exception
{
requesting(out);
}
@Override
void doExtendedInput(ExtendedDataInputStream in) throws Exception
{
result = confirming(in);
}
void setRemoteException(Throwable t, boolean responding)
{
RemoteException remoteException = getRemoteException(t, responding);
getBufferInputStream().setException(remoteException);
}
private RemoteException getRemoteException(Throwable t, boolean responding)
{
if (t instanceof RemoteException)
{
return (RemoteException)t;
}
return new RemoteException(t, this, responding);
}
}
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