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/*******************************************************************************
* Copyright (c) 2007 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package com.windriver.tcf.api.util;
import java.io.IOException;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import com.windriver.tcf.api.protocol.Protocol;
public abstract class TCFTask<V> implements Runnable, Future<V> {
private V result;
private Throwable error;
private boolean canceled;
public TCFTask() {
Protocol.invokeLater(new Runnable() {
public void run() {
try {
TCFTask.this.run();
}
catch (Throwable x) {
if (result == null && error == null) error(x);
}
}
});
}
public synchronized void done(V result) {
if (canceled) return;
assert Protocol.isDispatchThread();
assert this.error == null;
assert this.result == null;
this.result = result;
notifyAll();
}
public synchronized void error(Throwable error) {
assert Protocol.isDispatchThread();
if (canceled) return;
assert this.error == null;
assert this.result == null;
this.error = error;
//System.err.print("TCFTask exception: ");
//error.printStackTrace();
notifyAll();
}
public synchronized boolean cancel(boolean mayInterruptIfRunning) {
if (isDone()) return false;
canceled = true;
error = new CancellationException();
notifyAll();
return true;
}
public V get() throws InterruptedException, ExecutionException {
assert !Protocol.isDispatchThread();
synchronized (this) {
if (!isDone()) wait();
if (error instanceof ExecutionException) throw (ExecutionException)error;
if (error instanceof InterruptedException) throw (InterruptedException)error;
if (error != null) throw new ExecutionException(error);
return result;
}
}
public V getE() {
try {
return get();
}
catch (Throwable e) {
if (e instanceof Error) throw (Error)e;
throw new Error(e);
}
}
public V getIO() throws IOException {
try {
return get();
}
catch (Throwable e) {
if (e instanceof IOException) throw (IOException)e;
IOException y = new IOException();
y.initCause(e);
throw y;
}
}
public synchronized V get(long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
unit.toNanos(timeout);
// TODO Auto-generated method stub
assert false;
return null;
}
public synchronized boolean isCancelled() {
return canceled;
}
public synchronized boolean isDone() {
return canceled || error != null || result != null;
}
}
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