/**
    * 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.procedure2;
  
  import java.io.IOException;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hbase.HBaseCommonTestingUtility;
  import org.apache.hadoop.hbase.procedure2.store.NoopProcedureStore;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.apache.hadoop.hbase.testclassification.MasterTests;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  @Category({MasterTests.class, SmallTests.class})
  public class TestProcedureInMemoryChore {
    private static final Log LOG = LogFactory.getLog(TestProcedureInMemoryChore.class);
  
    private static final int PROCEDURE_EXECUTOR_SLOTS = 1;
  
    private TestProcEnv procEnv;
    private NoopProcedureStore procStore;
    private ProcedureExecutor<TestProcEnv> procExecutor;
  
    private HBaseCommonTestingUtility htu;
  
    @SuppressWarnings("rawtypes")
    @Before
    public void setUp() throws IOException {
      htu = new HBaseCommonTestingUtility();
  
      procEnv = new TestProcEnv();
      procStore = new NoopProcedureStore();
      procExecutor = new ProcedureExecutor(htu.getConfiguration(), procEnv, procStore);
      procExecutor.testing = new ProcedureExecutor.Testing();
      procStore.start(PROCEDURE_EXECUTOR_SLOTS);
      procExecutor.start(PROCEDURE_EXECUTOR_SLOTS, true);
    }
  
    @After
    public void tearDown() throws IOException {
      procExecutor.stop();
      procStore.stop(false);
    }
  
    @Test
    public void testChoreAddAndRemove() throws Exception {
      final int timeoutMSec = 50;
      final int nCountDown = 5;
  
      // submit the chore and wait for execution
      CountDownLatch latch = new CountDownLatch(nCountDown);
      TestLatchChore chore = new TestLatchChore(timeoutMSec, latch);
      procExecutor.addChore(chore);
      assertTrue(chore.isRunnable());
      latch.await();
  
      // remove the chore and verify it is no longer executed
      assertTrue(chore.isRunnable());
      procExecutor.removeChore(chore);
      latch = new CountDownLatch(nCountDown);
      chore.setLatch(latch);
      latch.await(timeoutMSec * nCountDown, TimeUnit.MILLISECONDS);
      LOG.info("chore latch count=" + latch.getCount());
      assertFalse(chore.isRunnable());
      assertTrue("latchCount=" + latch.getCount(), latch.getCount() > 0);
    }
  
    public static class TestLatchChore extends ProcedureInMemoryChore<TestProcEnv> {
      private CountDownLatch latch;
  
      public TestLatchChore(final int timeoutMSec, final CountDownLatch latch) {
        super(timeoutMSec);
        setLatch(latch);
      }
 
     public void setLatch(final CountDownLatch latch) {
       this.latch = latch;
     }
 
     @Override
     protected void periodicExecute(final TestProcEnv env) {
       latch.countDown();
     }
   }
 
   private static class TestProcEnv {
   }
 }