001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.client;
019
020import java.io.IOException;
021import java.util.Optional;
022import java.util.concurrent.atomic.AtomicLong;
023import org.apache.hadoop.conf.Configuration;
024import org.apache.hadoop.hbase.coprocessor.ObserverContext;
025import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
026import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
027import org.apache.hadoop.hbase.coprocessor.RegionObserver;
028import org.apache.hadoop.hbase.util.Threads;
029
030/**
031 * This coproceesor sleep 2s at first increment/append rpc call.
032 */
033public class SleepAtFirstRpcCall implements RegionCoprocessor, RegionObserver {
034  static final AtomicLong ct = new AtomicLong(0);
035  static final String SLEEP_TIME_CONF_KEY = "hbase.coprocessor.SleepAtFirstRpcCall.sleepTime";
036  static final long DEFAULT_SLEEP_TIME = 2000;
037  static final AtomicLong sleepTime = new AtomicLong(DEFAULT_SLEEP_TIME);
038
039  @Override
040  public Optional<RegionObserver> getRegionObserver() {
041    return Optional.of(this);
042  }
043
044  public SleepAtFirstRpcCall() {
045  }
046
047  @Override
048  public void postOpen(ObserverContext<RegionCoprocessorEnvironment> c) {
049    RegionCoprocessorEnvironment env = c.getEnvironment();
050    Configuration conf = env.getConfiguration();
051    sleepTime.set(conf.getLong(SLEEP_TIME_CONF_KEY, DEFAULT_SLEEP_TIME));
052  }
053
054  @Override
055  public Result postIncrement(final ObserverContext<RegionCoprocessorEnvironment> e,
056    final Increment increment, final Result result) throws IOException {
057    if (ct.incrementAndGet() == 1) {
058      Threads.sleep(sleepTime.get());
059    }
060    return result;
061  }
062
063  @Override
064  public Result postAppend(final ObserverContext<RegionCoprocessorEnvironment> e,
065    final Append append, final Result result) throws IOException {
066    if (ct.incrementAndGet() == 1) {
067      Threads.sleep(sleepTime.get());
068    }
069    return result;
070  }
071}