/**
    * 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.assertArrayEquals;
  
  import java.util.concurrent.BlockingQueue;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  import org.apache.hadoop.hbase.Cell;
  import org.apache.hadoop.hbase.CellUtil;
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.client.Put;
  import org.apache.hadoop.hbase.client.Table;
  import org.apache.hadoop.hbase.client.replication.ReplicationAdmin;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.apache.hadoop.hbase.testclassification.ReplicationTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.hadoop.hbase.wal.WAL;
  import org.junit.AfterClass;
  import org.junit.BeforeClass;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Confirm that the empty replication endpoint can work.
   */
  @Category({ ReplicationTests.class, MediumTests.class })
  public class TestVerifyCellsReplicationEndpoint {
  
    private static final Logger LOG =
      LoggerFactory.getLogger(TestVerifyCellsReplicationEndpoint.class);
  
    private static final HBaseTestingUtility UTIL = new HBaseTestingUtility();
  
    private static final TableName TABLE_NAME = TableName.valueOf("empty");
  
    private static final byte[] CF = Bytes.toBytes("family");
  
    private static final byte[] CQ = Bytes.toBytes("qualifier");
  
    private static final String PEER_ID = "empty";
  
    private static final BlockingQueue<Cell> CELLS = new LinkedBlockingQueue<>();
  
    public static final class EndpointForTest extends VerifyWALEntriesReplicationEndpoint {
  
      @Override
      public boolean replicate(ReplicateContext replicateContext) {
        LOG.info(replicateContext.getEntries().toString());
        for (WAL.Entry entry: replicateContext.getEntries()) {
          CELLS.addAll(entry.getEdit().getCells());
        }
        return super.replicate(replicateContext);
      }
    }
  
    @BeforeClass
    public static void setUp() throws Exception {
      UTIL.startMiniCluster(3);
      // notice that we do not need to set replication scope here, EmptyReplicationEndpoint take all
      // edits no matter what the replications scope is.
      ReplicationPeerConfig peerConfig = new ReplicationPeerConfig();
      peerConfig.setClusterKey("zk1:8888:/hbase");
      peerConfig.setReplicationEndpointImpl(EndpointForTest.class.getName());
      UTIL.createTable(TABLE_NAME, CF);
      try (ReplicationAdmin replAdmin = new ReplicationAdmin(UTIL.getConfiguration())) {
        replAdmin.addPeer(PEER_ID, peerConfig);
      }
    }
  
    @AfterClass
    public static void tearDown() throws Exception {
      UTIL.shutdownMiniCluster();
    }
  
    @Test
    public void test() throws Exception {
      try (Table table = UTIL.getConnection().getTable(TABLE_NAME)) {
        for (int i = 0; i < 100; i++) {
         table.put(new Put(Bytes.toBytes(i)).addColumn(CF, CQ, Bytes.toBytes(i)));
       }
     }
     long lastNoCellTime = -1;
     for (int i = 0; i < 100;) {
       Cell cell = CELLS.poll();
       if (cell == null) {
         if (lastNoCellTime < 0) {
           lastNoCellTime = System.nanoTime();
         } else {
           if (System.nanoTime() - lastNoCellTime >= TimeUnit.SECONDS.toNanos(30)) {
             throw new TimeoutException("Timeout waiting for wal edit");
           }
         }
         Thread.sleep(1000);
         continue;
       }
       lastNoCellTime = -1;
       if (!Bytes.equals(CF, CellUtil.cloneFamily(cell))) {
         // meta edits, such as open/close/flush, etc. skip
         continue;
       }
       assertArrayEquals(Bytes.toBytes(i), CellUtil.cloneRow(cell));
       assertArrayEquals(CQ, CellUtil.cloneQualifier(cell));
       assertArrayEquals(Bytes.toBytes(i), CellUtil.cloneValue(cell));
       i++;
     }
   }
 }