1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 package org.apache.hadoop.hbase.client; 19 20 import org.apache.commons.logging.Log; 21 import org.apache.commons.logging.LogFactory; 22 import org.apache.hadoop.hbase.classification.InterfaceAudience; 23 import org.apache.hadoop.hbase.util.EnvironmentEdgeManager; 24 25 import java.util.List; 26 import java.util.Map; 27 import java.util.Map.Entry; 28 29 /** 30 * A wrapper for a runnable for a group of actions for a single regionserver. 31 * <p> 32 * This can be used to build up the actions that should be taken and then 33 * </p> 34 * <p> 35 * This class exists to simulate using a ScheduledExecutorService with just a regular 36 * ExecutorService and Runnables. It is used for legacy reasons in the the client; this could 37 * only be removed if we change the expectations in HTable around the pool the client is able to 38 * pass in and even if we deprecate the current APIs would require keeping this class around 39 * for the interim to bridge between the legacy ExecutorServices and the scheduled pool. 40 * </p> 41 */ 42 @InterfaceAudience.Private 43 public class DelayingRunner<T> implements Runnable { 44 private static final Log LOG = LogFactory.getLog(DelayingRunner.class); 45 46 private final Object sleepLock = new Object(); 47 private boolean triggerWake = false; 48 private long sleepTime; 49 private MultiAction<T> actions = new MultiAction<T>(); 50 private Runnable runnable; 51 52 public DelayingRunner(long sleepTime, Entry<byte[], List<Action<T>>> e) { 53 this.sleepTime = sleepTime; 54 add(e); 55 } 56 57 public void setRunner(Runnable runner) { 58 this.runnable = runner; 59 } 60 61 @Override 62 public void run() { 63 if (!sleep()) { 64 LOG.warn( 65 "Interrupted while sleeping for expected sleep time " + sleepTime + " ms"); 66 } 67 //TODO maybe we should consider switching to a listenableFuture for the actual callable and 68 // then handling the results/errors as callbacks. That way we can decrement outstanding tasks 69 // even if we get interrupted here, but for now, we still need to run so we decrement the 70 // outstanding tasks 71 this.runnable.run(); 72 } 73 74 /** 75 * Sleep for an expected amount of time. 76 * <p> 77 * This is nearly a copy of what the Sleeper does, but with the ability to know if you 78 * got interrupted while sleeping. 79 * </p> 80 * 81 * @return <tt>true</tt> if the sleep completely entirely successfully, 82 * but otherwise <tt>false</tt> if the sleep was interrupted. 83 */ 84 private boolean sleep() { 85 long now = EnvironmentEdgeManager.currentTimeMillis(); 86 long startTime = now; 87 long waitTime = sleepTime; 88 while (waitTime > 0) { 89 long woke = -1; 90 try { 91 synchronized (sleepLock) { 92 if (triggerWake) break; 93 sleepLock.wait(waitTime); 94 } 95 woke = EnvironmentEdgeManager.currentTimeMillis(); 96 } catch (InterruptedException iex) { 97 return false; 98 } 99 // Recalculate waitTime. 100 woke = (woke == -1) ? EnvironmentEdgeManager.currentTimeMillis() : woke; 101 waitTime = waitTime - (woke - startTime); 102 } 103 return true; 104 } 105 106 public void add(Map.Entry<byte[], List<Action<T>>> e) { 107 actions.add(e.getKey(), e.getValue()); 108 } 109 110 public MultiAction<T> getActions() { 111 return actions; 112 } 113 114 public long getSleepTime() { 115 return sleepTime; 116 } 117 }