com.hazelcast.scheduledexecutor.impl.DelegatingScheduledFutureStripper Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, 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.scheduledexecutor.impl;
import java.util.concurrent.CancellationException;
import java.util.concurrent.Delayed;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import static com.hazelcast.internal.util.ExceptionUtil.sneakyThrow;
import static com.hazelcast.internal.util.Preconditions.checkNotNull;
import static java.lang.Thread.currentThread;
/**
* Simple adapter that unwraps the Future delegation done in
* {@link com.hazelcast.spi.impl.executionservice.impl.DelegatingCallableTaskDecorator} for single-run Callable tasks.
*
* @param
*/
public class DelegatingScheduledFutureStripper
implements ScheduledFuture {
private final ScheduledFuture original;
public DelegatingScheduledFutureStripper(ScheduledFuture original) {
checkNotNull(original, "Original is null.");
this.original = original;
}
@Override
public long getDelay(TimeUnit unit) {
return original.getDelay(unit);
}
@Override
public int compareTo(Delayed o) {
throw new UnsupportedOperationException();
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
boolean cancelled = original.cancel(mayInterruptIfRunning);
try {
return peel().cancel(mayInterruptIfRunning);
} catch (CancellationException e) {
// ignore; cancelled before scheduled-in
ignore();
}
return cancelled;
}
@Override
public boolean isCancelled() {
return original.isCancelled() || peel().isCancelled();
}
@Override
public boolean isDone() {
return original.isDone() && peel().isDone();
}
@Override
public V get()
throws InterruptedException, ExecutionException {
return peel().get();
}
@Override
public V get(long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
throw new UnsupportedOperationException();
}
private Future peel() {
// Get the delegating Executor Future (in case of Callable, see. DelegatingCallableTaskDecorator)
try {
return (Future) original.get();
} catch (InterruptedException e) {
currentThread().interrupt();
sneakyThrow(e);
} catch (ExecutionException e) {
sneakyThrow(e);
}
return null;
}
private void ignore() {
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
DelegatingScheduledFutureStripper that = (DelegatingScheduledFutureStripper) o;
return original.equals(that.original);
}
@Override
public int hashCode() {
return original.hashCode();
}
}