org.apache.flink.runtime.rest.handler.InFlightRequestTracker 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.rest.handler;
import javax.annotation.concurrent.ThreadSafe;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Phaser;
/**
* Tracks in-flight client requests.
*
* @see AbstractHandler
*/
@ThreadSafe
class InFlightRequestTracker {
private final CompletableFuture terminationFuture = new CompletableFuture<>();
private final Phaser phaser = new Phaser(1) {
@Override
protected boolean onAdvance(final int phase, final int registeredParties) {
terminationFuture.complete(null);
return true;
}
};
/**
* Registers an in-flight request.
*/
public void registerRequest() {
phaser.register();
}
/**
* Deregisters an in-flight request.
*/
public void deregisterRequest() {
phaser.arriveAndDeregister();
}
/**
* Returns a future that completes when the in-flight requests that were registered prior to
* calling this method are deregistered.
*/
public CompletableFuture awaitAsync() {
phaser.arriveAndDeregister();
return terminationFuture;
}
}