helix-core/src/test/java/org/apache/helix/util/TestZKClientPool.java

package org.apache.helix.util;

/*
 * 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.
 */

import java.util.Date;

import org.apache.helix.TestHelper;
import org.apache.helix.zookeeper.datamodel.ZNRecord;
import org.apache.helix.zookeeper.impl.client.ZkClient;
import org.apache.helix.zookeeper.zkclient.ZkServer;
import org.apache.helix.zookeeper.zkclient.exception.ZkNoNodeException;
import org.testng.Assert;
import org.testng.annotations.Test;

public class TestZKClientPool {

  @Test
  public void test() throws Exception {
    String testName = "TestZKClientPool";
    System.out.println("START " + testName + " at " + new Date(System.currentTimeMillis()));

    String zkAddr = "localhost:21891";
    ZkServer zkServer = TestHelper.startZkServer(zkAddr);
    ZkClient zkClient = ZKClientPool.getZkClient(zkAddr);

    zkClient.createPersistent("/" + testName, new ZNRecord(testName));
    ZNRecord record = zkClient.readData("/" + testName);
    Assert.assertEquals(record.getId(), testName);

    TestHelper.stopZkServer(zkServer);

    // restart zk
    zkServer = TestHelper.startZkServer(zkAddr);
    try {
      zkClient = ZKClientPool.getZkClient(zkAddr);
      record = zkClient.readData("/" + testName);
      Assert.fail("should fail on zk no node exception");
    } catch (ZkNoNodeException e) {
      // OK
    } catch (Exception e) {
      Assert.fail("should not fail on exception other than ZkNoNodeException");
    }

    zkClient.createPersistent("/" + testName, new ZNRecord(testName));
    record = zkClient.readData("/" + testName);
    Assert.assertEquals(record.getId(), testName);

    zkClient.close();
    TestHelper.stopZkServer(zkServer);
    System.out.println("END " + testName + " at " + new Date(System.currentTimeMillis()));
  }
}