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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* 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.IBufferHandler;
import org.eclipse.net4j.channel.IChannel;
import org.eclipse.net4j.util.ReflectUtil;
import java.text.MessageFormat;
/**
* @author Eike Stepper
*/
public abstract class SignalActor<RESULT> extends Signal
{
public static final long NO_TIMEOUT = BufferInputStream.NO_TIMEOUT;
private boolean terminated;
private RESULT result;
protected SignalActor(IChannel channel)
{
SignalProtocol protocol = extractSignalProtocol(channel);
setProtocol(protocol);
setCorrelationID(protocol.getNextCorrelationID());
}
public RESULT send() throws Exception
{
return send(NO_TIMEOUT);
}
public RESULT send(long timeout) throws Exception
{
if (terminated)
{
throw new IllegalStateException("Terminated"); //$NON-NLS-1$
}
getProtocol().startSignal(this, timeout);
terminated = true;
return result;
}
@Override
public String toString()
{
return MessageFormat.format("{0}[{1}, {2}, correlation={3} {4}]", ReflectUtil.getSimpleName(getClass()),
getSignalID(), getProtocol(), getCorrelationID(), terminated ? "SENT" : "UNSENT");
}
protected void setResult(RESULT result)
{
this.result = result;
}
private static SignalProtocol extractSignalProtocol(IChannel channel)
{
IBufferHandler receiveHandler = channel.getReceiveHandler();
if (receiveHandler == null)
{
throw new IllegalArgumentException("Channel has no protocol"); //$NON-NLS-1$
}
if (receiveHandler instanceof SignalProtocol)
{
return (SignalProtocol)receiveHandler;
}
throw new IllegalArgumentException("Channel has no signal protocol"); //$NON-NLS-1$
}
}
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