/**
    * 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.replication;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.util.List;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hbase.ClusterStatus;
  import org.apache.hadoop.hbase.ServerLoad;
  import org.apache.hadoop.hbase.ServerName;
  import org.apache.hadoop.hbase.client.Admin;
  import org.apache.hadoop.hbase.client.Put;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category(MediumTests.class)
  public class TestReplicationStatus extends TestReplicationBase {
    private static final Log LOG = LogFactory.getLog(TestReplicationStatus.class);
    private static final String PEER_ID = "2";
  
    /**
     * Test for HBASE-9531
     * put a few rows into htable1, which should be replicated to htable2
     * create a ClusterStatus instance 'status' from HBaseAdmin
     * test : status.getLoad(server).getReplicationLoadSourceList()
     * test : status.getLoad(server).getReplicationLoadSink()
     * * @throws Exception
     */
    @Test(timeout = 300000)
    public void testReplicationStatus() throws Exception {
      LOG.info("testReplicationStatus");
  
      try (Admin hbaseAdmin = utility1.getConnection().getAdmin()) {
        // disable peer
        admin.disablePeer(PEER_ID);
  
        final byte[] qualName = Bytes.toBytes("q");
        Put p;
  
        for (int i = 0; i < NB_ROWS_IN_BATCH; i++) {
          p = new Put(Bytes.toBytes("row" + i));
          p.add(famName, qualName, Bytes.toBytes("val" + i));
          htable1.put(p);
        }
  
        ClusterStatus status = hbaseAdmin.getClusterStatus();
  
        for (ServerName server : status.getServers()) {
          ServerLoad sl = status.getLoad(server);
          List<ReplicationLoadSource> rLoadSourceList = sl.getReplicationLoadSourceList();
          ReplicationLoadSink rLoadSink = sl.getReplicationLoadSink();
  
          // check SourceList only has one entry, beacuse only has one peer
          assertTrue("failed to get ReplicationLoadSourceList", (rLoadSourceList.size() == 1));
          assertEquals(PEER_ID, rLoadSourceList.get(0).getPeerID());
  
          // check Sink exist only as it is difficult to verify the value on the fly
          assertTrue("failed to get ReplicationLoadSink.AgeOfLastShippedOp ",
            (rLoadSink.getAgeOfLastAppliedOp() >= 0));
          assertTrue("failed to get ReplicationLoadSink.TimeStampsOfLastAppliedOp ",
            (rLoadSink.getTimeStampsOfLastAppliedOp() >= 0));
        }
  
        // Stop rs1, then the queue of rs1 will be transfered to rs0
        utility1.getHBaseCluster().getRegionServer(1).stop("Stop RegionServer");
        Thread.sleep(10000);
        status = hbaseAdmin.getClusterStatus();
        ServerName server = utility1.getHBaseCluster().getRegionServer(0).getServerName();
        ServerLoad sl = status.getLoad(server);
        List<ReplicationLoadSource> rLoadSourceList = sl.getReplicationLoadSourceList();
        // check SourceList still only has one entry
        assertTrue("failed to get ReplicationLoadSourceList", (rLoadSourceList.size() == 1));
        assertEquals(PEER_ID, rLoadSourceList.get(0).getPeerID());
      } finally {
        admin.enablePeer(PEER_ID);
        utility1.getHBaseCluster().getRegionServer(1).start();
      }
    }
 }