Apache ZooKeeper is an open-source server which enables highly reliable distributed coordination.

Apache ZooKeeper Server Source Code files are provided in the source package file, apache-zookeeper-3.8.0.tar.gz.

You can download apache-zookeeper-3.8.0.tar.gz as described in the previous tutorial and go to the "zookeeper-server" sub-folder to view Apache ZooKeeper Server Source Code files.

You can also browse Apache ZooKeeper Server Source Code below:

⏎ org/apache/zookeeper/server/ObserverBean.java

/*
 * 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.zookeeper.server;

import java.net.InetSocketAddress;
import org.apache.zookeeper.server.quorum.Observer;
import org.apache.zookeeper.server.quorum.ObserverMXBean;
import org.apache.zookeeper.server.quorum.QuorumPeer;

/**
 * ObserverBean
 *
 */
public class ObserverBean extends ZooKeeperServerBean implements ObserverMXBean {

    private Observer observer;

    public ObserverBean(Observer observer, ZooKeeperServer zks) {
        super(zks);
        this.observer = observer;
    }

    public String getName() {
        return "Observer";
    }

    public int getPendingRevalidationCount() {
        return this.observer.getPendingRevalidationsCount();
    }

    public String getQuorumAddress() {
        return observer.getSocket().toString();
    }

    public String getLearnerMaster() {
        QuorumPeer.QuorumServer learnerMaster = observer.getCurrentLearnerMaster();
        if (learnerMaster == null || learnerMaster.addr.isEmpty()) {
            return "Unknown";
        }
        InetSocketAddress address = learnerMaster.addr.getReachableOrOne();
        return address.getAddress().getHostAddress() + ":" + address.getPort();
    }

    public void setLearnerMaster(String learnerMaster) {
        if (!observer.setLearnerMaster(learnerMaster)) {
            throw new IllegalArgumentException("Not a valid learner master");
        }
    }

}

⏎ org/apache/zookeeper/server/ObserverBean.java

Or download all of them as a single archive file:

File name: zookeeper-server-3.8.0-fyi.zip
File size: 885581 bytes
Release date: 2022-02-25
Download 

⇒ Apache ZooKeeper Jute Source Code

⇐ Download and Install Apache ZooKeeper Source Package

⇑ Downloading and Reviewing zookeeper.jar

⇑⇑ FAQ for Apache ZooKeeper