/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.spi.impl.executionservice.impl;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.impl.AbstractCompletableFuture;
import com.hazelcast.util.EmptyStatement;
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 static com.hazelcast.util.ExceptionUtil.sneakyThrow;
/**
* Wraps a java.util.concurrent.Future to make it a com.hazelcast.core.ICompletableFuture.
* <p>
* Ensures two-directional binding when it comes to cancellation:
* - if delegate future cancelled - this future may be done or cancelled
* - if this future cancelled - delegate future may be done or cancelled
* <p>
* Ensures the transfer of the result from the delegate future to this future
* on execution of get() and isDone() methods.
*/
class BasicCompletableFuture<V> extends AbstractCompletableFuture<V> {
final Future<V> delegate;
BasicCompletableFuture(Future<V> delegate, NodeEngine nodeEngine) {
super(nodeEngine, nodeEngine.getLogger(BasicCompletableFuture.class));
this.delegate = delegate;
}
@Override
public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
return (V) ensureResultSet(timeout, unit);
}
private Object ensureResultSet(long timeout, TimeUnit unit) throws ExecutionException, CancellationException {
Object result = null;
try {
result = delegate.get(timeout, unit);
} catch (TimeoutException ex) {
sneakyThrow(ex);
} catch (InterruptedException ex) {
sneakyThrow(ex);
} catch (ExecutionException ex) {
setResult(ex);
throw ex;
} catch (CancellationException ex) {
setResult(ex);
throw ex;
} catch (Throwable t) {
result = t;
}
setResult(result);
return result;
}
@Override
public boolean isDone() {
if (delegate.isDone()) {
try {
ensureResultSet(Long.MAX_VALUE, TimeUnit.DAYS);
} catch (ExecutionException ignored) {
EmptyStatement.ignore(ignored);
} catch (CancellationException ignored) {
EmptyStatement.ignore(ignored);
}
return true;
} else {
return super.isDone();
}
}
@Override
public boolean isCancelled() {
if (delegate.isCancelled()) {
cancel(true);
return true;
} else {
return super.isCancelled();
}
}
@Override
public boolean shouldCancel(boolean mayInterruptIfRunning) {
if (!delegate.isCancelled()) {
delegate.cancel(mayInterruptIfRunning);
}
return true;
}
}