org.apache.flink.runtime.dispatcher.runner.DispatcherRunnerLeaderElectionLifecycleManager Maven / Gradle / Ivy

Go to download
/*
 * 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.dispatcher.runner;

import org.apache.flink.runtime.clusterframework.ApplicationStatus;
import org.apache.flink.runtime.leaderelection.LeaderContender;
import org.apache.flink.runtime.leaderelection.LeaderElectionService;
import org.apache.flink.util.concurrent.FutureUtils;

import java.util.Arrays;
import java.util.concurrent.CompletableFuture;

final class DispatcherRunnerLeaderElectionLifecycleManager<
                T extends DispatcherRunner & LeaderContender>
        implements DispatcherRunner {
    private final T dispatcherRunner;
    private final LeaderElectionService leaderElectionService;

    private DispatcherRunnerLeaderElectionLifecycleManager(
            T dispatcherRunner, LeaderElectionService leaderElectionService) throws Exception {
        this.dispatcherRunner = dispatcherRunner;
        this.leaderElectionService = leaderElectionService;

        leaderElectionService.start(dispatcherRunner);
    }

    @Override
    public CompletableFuture getShutDownFuture() {
        return dispatcherRunner.getShutDownFuture();
    }

    @Override
    public CompletableFuture closeAsync() {
        final CompletableFuture servicesTerminationFuture = stopServices();
        final CompletableFuture dispatcherRunnerTerminationFuture =
                dispatcherRunner.closeAsync();

        return FutureUtils.completeAll(
                Arrays.asList(servicesTerminationFuture, dispatcherRunnerTerminationFuture));
    }

    private CompletableFuture stopServices() {
        try {
            leaderElectionService.stop();
        } catch (Exception e) {
            return FutureUtils.completedExceptionally(e);
        }

        return FutureUtils.completedVoidFuture();
    }

    public static  DispatcherRunner createFor(
            T dispatcherRunner, LeaderElectionService leaderElectionService) throws Exception {
        return new DispatcherRunnerLeaderElectionLifecycleManager<>(
                dispatcherRunner, leaderElectionService);
    }
}