| 1 | // Copyright 2004-2007 Jean-Francois Poilpret |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package net.sourceforge.hiveutils.service.impl; |
| 16 | |
| 17 | import java.util.List; |
| 18 | |
| 19 | import org.apache.commons.logging.Log; |
| 20 | import org.apache.hivemind.events.RegistryShutdownListener; |
| 21 | |
| 22 | import net.sourceforge.hiveutils.collections.Queue; |
| 23 | import net.sourceforge.hiveutils.collections.impl.QueueImpl; |
| 24 | import net.sourceforge.hiveutils.service.AsynchronousTaskPerformer; |
| 25 | |
| 26 | /** |
| 27 | * Implementation of the Asynchroneous task performer service. |
| 28 | * |
| 29 | * @author Jean-Francois Poilpret |
| 30 | */ |
| 31 | public class AsynchronousTaskPerformerImpl |
| 32 | implements AsynchronousTaskPerformer, |
| 33 | RegistryShutdownListener, |
| 34 | Runnable |
| 35 | { |
| 36 | public AsynchronousTaskPerformerImpl(Log logger, long waitTime, int minTasks) |
| 37 | { |
| 38 | _logger = logger; |
| 39 | _waitTime = waitTime; |
| 40 | _minTasks = minTasks; |
| 41 | _thread = new Thread(this); |
| 42 | _thread.start(); |
| 43 | } |
| 44 | |
| 45 | public void registryDidShutdown() |
| 46 | { |
| 47 | _logger.info("registryDidShutdown()"); |
| 48 | executeNowAndWait(false); |
| 49 | _logger.debug("LEAVE registryDidShutdown()"); |
| 50 | } |
| 51 | |
| 52 | public void addTask(Runnable task) |
| 53 | { |
| 54 | if (task != null) |
| 55 | { |
| 56 | _tasks.add(task); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | public void executeNowAndWait() |
| 61 | { |
| 62 | executeNowAndWait(true); |
| 63 | } |
| 64 | |
| 65 | synchronized private void executeNowAndWait(boolean restart) |
| 66 | { |
| 67 | _logger.debug("executeNowAndWait() #1"); |
| 68 | _suspend = true; |
| 69 | _tasks.unblock(); |
| 70 | // Have to interrupt the thread just in case _tasks.take() has just been called |
| 71 | _thread.interrupt(); |
| 72 | _logger.debug("executeNowAndWait() #2"); |
| 73 | try |
| 74 | { |
| 75 | _thread.join(); |
| 76 | } |
| 77 | catch (InterruptedException e) |
| 78 | { |
| 79 | _logger.warn("executeNowAndWait()", e); |
| 80 | } |
| 81 | _logger.debug("executeNowAndWait() #3"); |
| 82 | if (restart) |
| 83 | { |
| 84 | _suspend = false; |
| 85 | _thread = new Thread(this); |
| 86 | _thread.start(); |
| 87 | } |
| 88 | else |
| 89 | { |
| 90 | _thread = null; |
| 91 | } |
| 92 | _logger.debug("executeNowAndWait() #4"); |
| 93 | } |
| 94 | |
| 95 | public void executeNow() |
| 96 | { |
| 97 | _tasks.unblock(); |
| 98 | } |
| 99 | |
| 100 | //CSOFF: IllegalCatchCheck |
| 101 | public void run() |
| 102 | { |
| 103 | while (!_suspend) |
| 104 | { |
| 105 | _logger.debug("run() #1"); |
| 106 | List<Runnable> tasks = _tasks.take(_minTasks, _waitTime); |
| 107 | _logger.debug("run() #2 Num tasks to perform: " + tasks.size()); |
| 108 | for (Runnable task: tasks) |
| 109 | { |
| 110 | try |
| 111 | { |
| 112 | task.run(); |
| 113 | } |
| 114 | catch (Exception e) |
| 115 | { |
| 116 | _logger.warn("Task " + task, e); |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | _logger.debug("run() exiting thread"); |
| 121 | } |
| 122 | //CSON: IllegalCatchCheck |
| 123 | |
| 124 | final private Log _logger; |
| 125 | final private Queue<Runnable> _tasks = new QueueImpl<Runnable>(); |
| 126 | final private long _waitTime; |
| 127 | final private int _minTasks; |
| 128 | private Thread _thread; |
| 129 | private boolean _suspend = false; |
| 130 | } |