org.apache.flink.runtime.highavailability.zookeeper.ZooKeeperClientHAServices Maven / Gradle / Ivy

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 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.flink.runtime.highavailability.zookeeper;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.highavailability.ClientHighAvailabilityServices;
import org.apache.flink.runtime.leaderretrieval.LeaderRetrievalService;
import org.apache.flink.runtime.util.ZooKeeperUtils;
import org.apache.flink.util.Preconditions;

import javax.annotation.Nonnull;

/** ZooKeeper based implementation for {@link ClientHighAvailabilityServices}. */
public class ZooKeeperClientHAServices implements ClientHighAvailabilityServices {

    private final CuratorFrameworkWithUnhandledErrorListener curatorFrameworkWrapper;

    private final Configuration configuration;

    public ZooKeeperClientHAServices(
            @Nonnull CuratorFrameworkWithUnhandledErrorListener curatorFrameworkWrapper,
            @Nonnull Configuration configuration) {
        this.curatorFrameworkWrapper = Preconditions.checkNotNull(curatorFrameworkWrapper);
        this.configuration = Preconditions.checkNotNull(configuration);
    }

    @Override
    public LeaderRetrievalService getClusterRestEndpointLeaderRetriever() {
        return ZooKeeperUtils.createLeaderRetrievalService(
                curatorFrameworkWrapper.asCuratorFramework(),
                ZooKeeperUtils.getLeaderPathForRestServer(),
                configuration);
    }

    @Override
    public void close() throws Exception {
        curatorFrameworkWrapper.close();
    }
}