org.apache.flink.runtime.io.async.AsyncStoppableTaskWithCallback Maven / Gradle / Ivy
/*
* 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.flink.runtime.io.async;
import org.apache.flink.util.Preconditions;
import java.util.concurrent.FutureTask;
/**
* @param return type of the callable function
*/
public class AsyncStoppableTaskWithCallback extends FutureTask {
protected final StoppableCallbackCallable stoppableCallbackCallable;
public AsyncStoppableTaskWithCallback(StoppableCallbackCallable callable) {
super(Preconditions.checkNotNull(callable));
this.stoppableCallbackCallable = callable;
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
final boolean cancel = super.cancel(mayInterruptIfRunning);
if (cancel) {
stoppableCallbackCallable.stop();
// this is where we report done() for the cancel case, after calling stop().
stoppableCallbackCallable.done(true);
}
return cancel;
}
@Override
protected void done() {
// we suppress forwarding if we have not been canceled, because the cancel case will call to this method separately.
if (!isCancelled()) {
stoppableCallbackCallable.done(false);
}
}
public static AsyncStoppableTaskWithCallback from(StoppableCallbackCallable callable) {
return new AsyncStoppableTaskWithCallback<>(callable);
}
}