/**
    * 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.coprocessor;
  
  import static org.apache.hadoop.hbase.coprocessor.CoprocessorHost.COPROCESSORS_ENABLED_CONF_KEY;
  import static org.apache.hadoop.hbase.coprocessor.CoprocessorHost.REGION_COPROCESSOR_CONF_KEY;
  import static org.apache.hadoop.hbase.coprocessor.CoprocessorHost.SKIP_LOAD_DUPLICATE_TABLE_COPROCESSOR;
  import static org.apache.hadoop.hbase.coprocessor.CoprocessorHost.USER_COPROCESSORS_ENABLED_CONF_KEY;
  import static org.junit.Assert.assertEquals;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.List;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.CoprocessorEnvironment;
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.HColumnDescriptor;
  import org.apache.hadoop.hbase.HTableDescriptor;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.junit.runners.Parameterized;
  import org.junit.runners.Parameterized.Parameters;
  
  @Category({MediumTests.class})
  @RunWith(Parameterized.class)
  public class TestRegionCoprocessorHost {
  
    private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
    private final boolean skip;
  
    @Parameters
    public static List<Object> params() {
      return Arrays.asList(new Object[] { new Boolean(true), new Boolean(false) });
    }
  
    public TestRegionCoprocessorHost(boolean skip) {
      this.skip = skip;
    }
  
    @Before
    public void setUp() throws Exception {
      Configuration conf = TEST_UTIL.getConfiguration();
      conf.setBoolean(COPROCESSORS_ENABLED_CONF_KEY, true);
      conf.setBoolean(USER_COPROCESSORS_ENABLED_CONF_KEY, true);
      conf.setBoolean(SKIP_LOAD_DUPLICATE_TABLE_COPROCESSOR, skip);
      conf.set(REGION_COPROCESSOR_CONF_KEY, SimpleRegionObserver.class.getName());
      TEST_UTIL.startMiniCluster();
    }
  
    @After
    public void tearDown() throws Exception {
      TEST_UTIL.shutdownMiniCluster();
    }
  
    @Test
    public void testLoadDuplicateCoprocessor() throws Exception {
      TableName table = TableName.valueOf("testLoadDuplicateCoprocessor");
      HTableDescriptor tableDesc = new HTableDescriptor(table);
      tableDesc.addFamily(new HColumnDescriptor("cf"));
      tableDesc.addCoprocessor(TestRegionObserver.class.getName());
  
      // Only one coprocessor SimpleRegionObserver loaded if skipping, two otherwise
      TEST_UTIL.getHBaseAdmin().createTable(tableDesc);
      assertEquals(skip ? 1 : 2, TestRegionObserver.getNumInstances());
    }
  
    public static final class TestRegionObserver extends SimpleRegionObserver {
      public static final AtomicInteger numInstances = new AtomicInteger(0);
  
      @Override
      public void start(CoprocessorEnvironment e) throws IOException {
        super.start(e);
        numInstances.incrementAndGet();
      }
  
      public static int getNumInstances() {
        return numInstances.get();
     }
   }
 }