hbase-server/src/test/java/org/apache/hadoop/hbase/TestLocalHBaseCluster.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.hadoop.hbase;

import static org.junit.Assert.*;

import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.master.HMaster;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.testclassification.MiscTests;
import org.apache.zookeeper.KeeperException;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category({MiscTests.class, MediumTests.class})
public class TestLocalHBaseCluster {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
      HBaseClassTestRule.forClass(TestLocalHBaseCluster.class);

  private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();

  /**
   * Check that we can start a local HBase cluster specifying a custom master
   * and regionserver class and then cast back to those classes; also that
   * the cluster will launch and terminate cleanly. See HBASE-6011. Uses the
   * HBaseTestingUtility facilities for creating a LocalHBaseCluster with
   * custom master and regionserver classes.
   */
  @Test
  public void testLocalHBaseCluster() throws Exception {
    // Set Master class and RegionServer class, and use default values for other options.
    StartMiniClusterOption option = StartMiniClusterOption.builder()
        .masterClass(MyHMaster.class).rsClass(MyHRegionServer.class).build();
    TEST_UTIL.startMiniCluster(option);
    // Can we cast back to our master class?
    try {
      int val = ((MyHMaster)TEST_UTIL.getHBaseCluster().getMaster(0)).echo(42);
      assertEquals(42, val);
    } catch (ClassCastException e) {
      fail("Could not cast master to our class");
    }
    // Can we cast back to our regionserver class?
    try {
      int val = ((MyHRegionServer)TEST_UTIL.getHBaseCluster().getRegionServer(0)).echo(42);
      assertEquals(42, val);
    } catch (ClassCastException e) {
      fail("Could not cast regionserver to our class");
    }
    TEST_UTIL.shutdownMiniCluster();
  }

  /**
   * A private master class similar to that used by HMasterCommandLine when
   * running in local mode.
   */
  public static class MyHMaster extends HMaster {
    public MyHMaster(Configuration conf) throws IOException, KeeperException,
        InterruptedException {
      super(conf);
    }

    public int echo(int val) {
      return val;
    }
  }

  /**
   * A private regionserver class with a dummy method for testing casts
   */
  public static class MyHRegionServer extends MiniHBaseCluster.MiniHBaseClusterRegionServer {

    public MyHRegionServer(Configuration conf) throws IOException, InterruptedException {
      super(conf);
    }

    public int echo(int val) {
      return val;
    }
  }
}