org.apache.hadoop.contrib.bkjournal.TestCurrentInprogress.java Source code

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Here is the source code for org.apache.hadoop.contrib.bkjournal.TestCurrentInprogress.java

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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,
 * 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.hadoop.contrib.bkjournal;

import static org.junit.Assert.assertEquals;

import java.io.File;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import org.apache.bookkeeper.util.LocalBookKeeper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.server.NIOServerCnxnFactory;
import org.apache.zookeeper.server.ZooKeeperServer;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

/**
 * Tests that read, update, clear api from CurrentInprogress
 */
public class TestCurrentInprogress {
    private static final Log LOG = LogFactory.getLog(TestCurrentInprogress.class);
    private static final String CURRENT_NODE_PATH = "/test";
    private static final String HOSTPORT = "127.0.0.1:2181";
    private static final int CONNECTION_TIMEOUT = 30000;
    private static NIOServerCnxnFactory serverFactory;
    private static ZooKeeperServer zks;
    private static ZooKeeper zkc;
    private static int ZooKeeperDefaultPort = 2181;
    private static File zkTmpDir;

    private static ZooKeeper connectZooKeeper(String ensemble)
            throws IOException, KeeperException, InterruptedException {
        final CountDownLatch latch = new CountDownLatch(1);

        ZooKeeper zkc = new ZooKeeper(HOSTPORT, 3600, new Watcher() {
            public void process(WatchedEvent event) {
                if (event.getState() == Watcher.Event.KeeperState.SyncConnected) {
                    latch.countDown();
                }
            }
        });
        if (!latch.await(10, TimeUnit.SECONDS)) {
            throw new IOException("Zookeeper took too long to connect");
        }
        return zkc;
    }

    @BeforeClass
    public static void setupZooKeeper() throws Exception {
        LOG.info("Starting ZK server");
        zkTmpDir = File.createTempFile("zookeeper", "test");
        zkTmpDir.delete();
        zkTmpDir.mkdir();
        try {
            zks = new ZooKeeperServer(zkTmpDir, zkTmpDir, ZooKeeperDefaultPort);
            serverFactory = new NIOServerCnxnFactory();
            serverFactory.configure(new InetSocketAddress(ZooKeeperDefaultPort), 10);
            serverFactory.startup(zks);
        } catch (Exception e) {
            LOG.error("Exception while instantiating ZooKeeper", e);
        }
        boolean b = LocalBookKeeper.waitForServerUp(HOSTPORT, CONNECTION_TIMEOUT);
        LOG.debug("ZooKeeper server up: " + b);
    }

    @AfterClass
    public static void shutDownServer() {
        if (null != zks) {
            zks.shutdown();
        }
        zkTmpDir.delete();
    }

    @Before
    public void setup() throws Exception {
        zkc = connectZooKeeper(HOSTPORT);
    }

    @After
    public void teardown() throws Exception {
        if (null != zkc) {
            zkc.close();
        }

    }

    /**
     * Tests that read should be able to read the data which updated with update
     * api
     */
    @Test
    public void testReadShouldReturnTheZnodePathAfterUpdate() throws Exception {
        String data = "inprogressNode";
        CurrentInprogress ci = new CurrentInprogress(zkc, CURRENT_NODE_PATH);
        ci.init();
        ci.update(data);
        String inprogressNodePath = ci.read();
        assertEquals("Not returning inprogressZnode", "inprogressNode", inprogressNodePath);
    }

    /**
     * Tests that read should return null if we clear the updated data in
     * CurrentInprogress node
     */
    @Test
    public void testReadShouldReturnNullAfterClear() throws Exception {
        CurrentInprogress ci = new CurrentInprogress(zkc, CURRENT_NODE_PATH);
        ci.init();
        ci.update("myInprogressZnode");
        ci.read();
        ci.clear();
        String inprogressNodePath = ci.read();
        assertEquals("Expecting null to be return", null, inprogressNodePath);
    }

    /**
     * Tests that update should throw IOE, if version number modifies between read
     * and update
     */
    @Test(expected = IOException.class)
    public void testUpdateShouldFailWithIOEIfVersionNumberChangedAfterRead() throws Exception {
        CurrentInprogress ci = new CurrentInprogress(zkc, CURRENT_NODE_PATH);
        ci.init();
        ci.update("myInprogressZnode");
        assertEquals("Not returning myInprogressZnode", "myInprogressZnode", ci.read());
        // Updating data in-between to change the data to change the version number
        ci.update("YourInprogressZnode");
        ci.update("myInprogressZnode");
    }

}