/* | |
* | |
* Apache Geronimo JCache Spec 1.0 | |
* | |
* Copyright (C) 2003 - 2014 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 javax.cache.integration; | |
import java.util.concurrent.ExecutionException; | |
import java.util.concurrent.Future; | |
import java.util.concurrent.TimeUnit; | |
import java.util.concurrent.TimeoutException; | |
public class CompletionListenerFuture implements CompletionListener, Future<Void> { | |
private boolean isCompleted; | |
private Exception exception; | |
public CompletionListenerFuture() { | |
this.isCompleted = false; | |
this.exception = null; | |
} | |
@Override | |
public void onCompletion() throws IllegalStateException { | |
synchronized (this) { | |
if (isCompleted) { | |
throw new IllegalStateException("Attempted to use a CompletionListenerFuture instance more than once"); | |
} else { | |
isCompleted = true; | |
notify(); | |
} | |
} | |
} | |
@Override | |
public void onException(Exception e) throws IllegalStateException { | |
synchronized (this) { | |
if (isCompleted) { | |
throw new IllegalStateException("Attempted to use a CompletionListenerFuture instance more than once"); | |
} else { | |
isCompleted = true; | |
exception = e; | |
notify(); | |
} | |
} | |
} | |
@Override | |
public boolean cancel(boolean b) { | |
throw new UnsupportedOperationException("CompletionListenerFutures can't be cancelled"); | |
} | |
@Override | |
public boolean isCancelled() { | |
return false; | |
} | |
@Override | |
public boolean isDone() { | |
synchronized (this) { | |
return isCompleted; | |
} | |
} | |
@Override | |
public Void get() throws InterruptedException, ExecutionException { | |
synchronized (this) { | |
while (!isCompleted) { | |
wait(); | |
} | |
if (exception == null) { | |
return null; | |
} else { | |
throw new ExecutionException(exception); | |
} | |
} | |
} | |
@Override | |
public Void get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException { | |
synchronized (this) { | |
if (!isCompleted) { | |
unit.timedWait(this, timeout); | |
} | |
if (isCompleted) { | |
if (exception == null) { | |
return null; | |
} else { | |
throw new ExecutionException(exception); | |
} | |
} else { | |
throw new TimeoutException(); | |
} | |
} | |
} | |
} |