io.confluent.admin.utils.ZookeeperConnectionWatcher.java Source code

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Here is the source code for io.confluent.admin.utils.ZookeeperConnectionWatcher.java

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/**
 * Copyright 2016 Confluent Inc.
 * <p>
 * Licensed 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 io.confluent.admin.utils;

import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;

import java.util.concurrent.CountDownLatch;

/**
 * Waits for SyncConnected. When SASL is enabled, waits for both SyncConnected and
 * SaslAuthenticated events.
 * <p>
 * In case of an AuthFailed event, isSuccessful is set to false. This should be verified in the
 * code using this class and failure message should be logged.
 */
public class ZookeeperConnectionWatcher implements Watcher {

    private CountDownLatch connectSignal;
    private boolean isSuccessful = true;
    private String failureMessage = null;
    private boolean isSASLEnabled = false;

    public ZookeeperConnectionWatcher(CountDownLatch connectSignal, boolean isSASLEnabled) {
        this.connectSignal = connectSignal;
        this.isSASLEnabled = isSASLEnabled;
    }

    public boolean isSuccessful() {
        return isSuccessful;
    }

    public String getFailureMessage() {
        return failureMessage;
    }

    @Override
    public void process(WatchedEvent event) {
        if (event.getType() == Event.EventType.None) {
            switch (event.getState()) {
            case SyncConnected:
                // If SASL is enabled, we want to wait for the SaslAuthenticated event.
                if (!isSASLEnabled) {
                    connectSignal.countDown();
                }
                break;
            case Expired:
                failureMessage = "Session expired.";
                isSuccessful = false;
                connectSignal.countDown();
                break;
            case Disconnected:
                failureMessage = "Disconnected from the server.";
                isSuccessful = false;
                connectSignal.countDown();
                break;
            case AuthFailed:
                failureMessage = "Authentication failed.";
                isSuccessful = false;
                connectSignal.countDown();
                break;
            case SaslAuthenticated:
                connectSignal.countDown();
                break;
            }
        }
    }
}