/*
 * 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.regionserver;

import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.IOException;
import java.util.Optional;
import java.util.TimerTask;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.StartMiniClusterOption;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.client.TableDescriptor;
import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
import org.apache.hadoop.hbase.coprocessor.ObserverContext;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.coprocessor.RegionObserver;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.testclassification.RegionServerTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.Threads;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Category({ RegionServerTests.class, MediumTests.class })
public class TestRegionServerAbortTimeout {

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

  private static final Logger LOG = LoggerFactory.getLogger(TestRegionServerAbortTimeout.class);

  private static final HBaseTestingUtility UTIL = new HBaseTestingUtility();

  private static TableName TABLE_NAME = TableName.valueOf("RSAbort");

  private static byte[] CF = Bytes.toBytes("cf");

  private static byte[] CQ = Bytes.toBytes("cq");

  private static final int REGIONS_NUM = 5;

  private static final int SLEEP_TIME_WHEN_CLOSE_REGION = 1000;

  private static volatile boolean abortTimeoutTaskScheduled = false;

  @BeforeClass
  public static void setUp() throws Exception {
    Configuration conf = UTIL.getConfiguration();
    // Will schedule a abort timeout task after SLEEP_TIME_WHEN_CLOSE_REGION ms
    conf.setLong(HRegionServer.ABORT_TIMEOUT, SLEEP_TIME_WHEN_CLOSE_REGION);
    conf.set(HRegionServer.ABORT_TIMEOUT_TASK, TestAbortTimeoutTask.class.getName());
    StartMiniClusterOption option = StartMiniClusterOption.builder().numRegionServers(2).build();
    UTIL.startMiniCluster(option);
    TableDescriptor td = TableDescriptorBuilder.newBuilder(TABLE_NAME)
        .setCoprocessor(SleepWhenCloseCoprocessor.class.getName())
        .setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(CF).build()).build();
    UTIL.getAdmin().createTable(td, Bytes.toBytes("0"), Bytes.toBytes("9"), REGIONS_NUM);
  }

  @AfterClass
  public static void tearDown() throws Exception {
    UTIL.shutdownMiniCluster();
  }

  @Test
  public void testAbortTimeout() throws Exception {
    Thread writer = new Thread(() -> {
      try {
        try (Table table = UTIL.getConnection().getTable(TABLE_NAME)) {
          for (int i = 0; i < 10000; i++) {
            table.put(new Put(Bytes.toBytes(i)).addColumn(CF, CQ, Bytes.toBytes(i)));
          }
        }
      } catch (IOException e) {
        LOG.warn("Failed to load data");
      }
    });
    writer.setDaemon(true);
    writer.start();

    // Abort one region server
    UTIL.getMiniHBaseCluster().getRegionServer(0).abort("Abort RS for test");

    long startTime = System.currentTimeMillis();
    long timeout = REGIONS_NUM * SLEEP_TIME_WHEN_CLOSE_REGION * 10;
    while (System.currentTimeMillis() - startTime < timeout) {
      if (UTIL.getMiniHBaseCluster().getLiveRegionServerThreads().size() == 1) {
        assertTrue("Abort timer task should be scheduled", abortTimeoutTaskScheduled);
        return;
      }
      Threads.sleep(SLEEP_TIME_WHEN_CLOSE_REGION);
    }
    fail("Failed to abort a region server in " + timeout + " ms");
  }

  static class TestAbortTimeoutTask extends TimerTask {

    public TestAbortTimeoutTask() {
    }

    @Override
    public void run() {
      LOG.info("TestAbortTimeoutTask was scheduled");
      abortTimeoutTaskScheduled = true;
    }
  }

  public static class SleepWhenCloseCoprocessor implements RegionCoprocessor, RegionObserver {

    public SleepWhenCloseCoprocessor() {
    }

    @Override
    public Optional<RegionObserver> getRegionObserver() {
      return Optional.of(this);
    }

    @Override
    public void preClose(ObserverContext<RegionCoprocessorEnvironment> c, boolean abortRequested)
        throws IOException {
      Threads.sleep(SLEEP_TIME_WHEN_CLOSE_REGION);
    }
  }
}