/* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cloudstack.framework.async;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
public class AsyncCallFuture<T> implements Future<T>, AsyncCompletionCallback<T> {
Object _completed = new Object();
boolean _done = false;
T _resultObject; // we will store a copy of the result object
public AsyncCallFuture() {
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
// TODO we don't support cancel yet
return false;
}
@Override
public T get() throws InterruptedException, ExecutionException {
synchronized (_completed) {
if (!_done)
_completed.wait();
}
return _resultObject;
}
@Override
public T get(long timeout, TimeUnit timeUnit) throws InterruptedException, ExecutionException, TimeoutException {
TimeUnit milliSecondsUnit = TimeUnit.MILLISECONDS;
synchronized (_completed) {
if (!_done)
_completed.wait(milliSecondsUnit.convert(timeout, timeUnit));
}
return _resultObject;
}
@Override
public boolean isCancelled() {
// TODO we don't support cancel yet
return false;
}
@Override
public boolean isDone() {
return _done;
}
@Override
public void complete(T resultObject) {
_resultObject = resultObject;
synchronized (_completed) {
_done = true;
_completed.notifyAll();
}
}
}