com.yihaodian.architecture.zkclient.ZkTestSystem.java Source code

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Here is the source code for com.yihaodian.architecture.zkclient.ZkTestSystem.java

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/**
 * Copyright 2010 the original author or authors.
 *
 * 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
 *
 * 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 com.yihaodian.architecture.zkclient;

import static org.mockito.Mockito.mock;

import java.io.File;
import java.io.IOException;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.log4j.Logger;
import org.junit.rules.ExternalResource;

public class ZkTestSystem extends ExternalResource {

    protected static final Logger LOG = Logger.getLogger(ZkTestSystem.class);

    private static int PORT = 10002;
    private static ZkTestSystem _instance;
    private ZkServer _zkServer;

    private ZkTestSystem() {
        LOG.info("~~~~~~~~~~~~~~~ starting zk system ~~~~~~~~~~~~~~~");
        String baseDir = "build/zkdata";
        try {
            FileUtils.deleteDirectory(new File(baseDir));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        String dataDir = baseDir + "/data";
        String logDir = baseDir + "/log";
        _zkServer = new ZkServer(dataDir, logDir, mock(IDefaultNameSpace.class), PORT);
        _zkServer.start();
        LOG.info("~~~~~~~~~~~~~~~ zk system started ~~~~~~~~~~~~~~~");
    }

    @Override
    // executed before every test method
    protected void before() throws Throwable {
        cleanupZk();
    }

    @Override
    // executed after every test method
    protected void after() {
        cleanupZk();
    }

    private void cleanupZk() {
        LOG.info("cleanup zk namespace");
        List<String> children = getZkClient().getChildren("/");
        for (String child : children) {
            if (!child.equals("zookeeper")) {
                getZkClient().deleteRecursive("/" + child);
            }
        }
        LOG.info("unsubscribing " + getZkClient().numberOfListeners() + " listeners");
        getZkClient().unsubscribeAll();
    }

    public static ZkTestSystem getInstance() {
        if (_instance == null) {
            _instance = new ZkTestSystem();
            _instance.cleanupZk();
            Runtime.getRuntime().addShutdownHook(new Thread() {
                @Override
                public void run() {
                    LOG.info("shutting zk down");
                    getInstance().getZkServer().shutdown();
                }
            });
        }
        return _instance;
    }

    public ZkServer getZkServer() {
        return _zkServer;
    }

    public String getZkServerAddress() {
        return "localhost:" + getServerPort();
    }

    public ZkClient getZkClient() {
        return _zkServer.getZkClient();
    }

    public int getServerPort() {
        return PORT;
    }

    public ZkClient createZkClient() {
        return new ZkClient("localhost:" + PORT);
    }

    public void showStructure() {
        getZkClient().showFolders(System.out);
    }

}