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| 1 | /* | ||
| 2 | * Copyright (c) 2002, 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package com.sun.jmx.snmp.tasks; | ||
| 27 | |||
| 28 | import java.util.ArrayList; | ||
| 29 | import com.sun.jmx.snmp.tasks.Task; | ||
| 30 | import com.sun.jmx.snmp.tasks.TaskServer; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * This class implements a {@link com.sun.jmx.snmp.tasks.TaskServer} over | ||
| 34 | * a thread pool. | ||
| 35 | * <p><b>This API is a Sun Microsystems internal API and is subject | ||
| 36 | * to change without notice.</b></p> | ||
| 37 | **/ | ||
| 38 | public class ThreadService implements TaskServer { | ||
| 39 | |||
| 40 | public ThreadService(int threadNumber) { | ||
| 41 | if (threadNumber <= 0) { | ||
| 42 | throw new IllegalArgumentException("The thread number should bigger than zero."); | ||
| 43 | } | ||
| 44 | |||
| 45 | minThreads = threadNumber; | ||
| 46 | threadList = new ExecutorThread[threadNumber]; | ||
| 47 | |||
| 48 | priority = Thread.currentThread().getPriority(); | ||
| 49 | cloader = Thread.currentThread().getContextClassLoader(); | ||
| 50 | |||
| 51 | } | ||
| 52 | |||
| 53 | // public methods | ||
| 54 | // -------------- | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Submit a task to be executed. | ||
| 58 | * Once a task is submitted, it is guaranteed that either | ||
| 59 | * {@link com.sun.jmx.snmp.tasks.Task#run() task.run()} or | ||
| 60 | * {@link com.sun.jmx.snmp.tasks.Task#cancel() task.cancel()} will be called. | ||
| 61 | * This implementation of TaskServer uses a thread pool to execute | ||
| 62 | * the submitted tasks. | ||
| 63 | * @param task The task to be executed. | ||
| 64 | * @exception IllegalArgumentException if the submitted task is null. | ||
| 65 | **/ | ||
| 66 | public void submitTask(Task task) throws IllegalArgumentException { | ||
| 67 | submitTask((Runnable)task); | ||
| 68 | } | ||
| 69 | |||
| 70 | /** | ||
| 71 | * Submit a task to be executed. | ||
| 72 | * This implementation of TaskServer uses a thread pool to execute | ||
| 73 | * the submitted tasks. | ||
| 74 | * @param task The task to be executed. | ||
| 75 | * @exception IllegalArgumentException if the submitted task is null. | ||
| 76 | **/ | ||
| 77 | public void submitTask(Runnable task) throws IllegalArgumentException { | ||
| 78 | stateCheck(); | ||
| 79 | |||
| 80 | if (task == null) { | ||
| 81 | throw new IllegalArgumentException("No task specified."); | ||
| 82 | } | ||
| 83 | |||
| 84 | synchronized(jobList) { | ||
| 85 | jobList.add(jobList.size(), task); | ||
| 86 | |||
| 87 | jobList.notify(); | ||
| 88 | } | ||
| 89 | |||
| 90 | createThread(); | ||
| 91 | } | ||
| 92 | |||
| 93 | public Runnable removeTask(Runnable task) { | ||
| 94 | stateCheck(); | ||
| 95 | |||
| 96 | Runnable removed = null; | ||
| 97 | synchronized(jobList) { | ||
| 98 | int lg = jobList.indexOf(task); | ||
| 99 | if (lg >= 0) { | ||
| 100 | removed = jobList.remove(lg); | ||
| 101 | } | ||
| 102 | } | ||
| 103 | if (removed != null && removed instanceof Task) | ||
| 104 | ((Task) removed).cancel(); | ||
| 105 | return removed; | ||
| 106 | } | ||
| 107 | |||
| 108 | public void removeAll() { | ||
| 109 | stateCheck(); | ||
| 110 | |||
| 111 | final Object[] jobs; | ||
| 112 | synchronized(jobList) { | ||
| 113 | jobs = jobList.toArray(); | ||
| 114 | jobList.clear(); | ||
| 115 | } | ||
| 116 | final int len = jobs.length; | ||
| 117 | for (int i=0; i<len ; i++) { | ||
| 118 | final Object o = jobs[i]; | ||
| 119 | if (o!= null && o instanceof Task) ((Task)o).cancel(); | ||
| 120 | } | ||
| 121 | } | ||
| 122 | |||
| 123 | // to terminate | ||
| 124 | public void terminate() { | ||
| 125 | |||
| 126 | if (terminated == true) { | ||
| 127 | return; | ||
| 128 | } | ||
| 129 | |||
| 130 | terminated = true; | ||
| 131 | |||
| 132 | synchronized(jobList) { | ||
| 133 | jobList.notifyAll(); | ||
| 134 | } | ||
| 135 | |||
| 136 | removeAll(); | ||
| 137 | |||
| 138 | for (int i=0; i<currThreds; i++) { | ||
| 139 | try { | ||
| 140 | threadList[i].interrupt(); | ||
| 141 | } catch (Exception e) { | ||
| 142 | // TODO | ||
| 143 | } | ||
| 144 | } | ||
| 145 | |||
| 146 | threadList = null; | ||
| 147 | } | ||
| 148 | |||
| 149 | // private classes | ||
| 150 | // --------------- | ||
| 151 | |||
| 152 | // A thread used to execute jobs | ||
| 153 | // | ||
| 154 | private class ExecutorThread extends Thread { | ||
| 155 | public ExecutorThread() { | ||
| 156 | super(threadGroup, "ThreadService-"+counter++); | ||
| 157 | setDaemon(true); | ||
| 158 | |||
| 159 | // init | ||
| 160 | this.setPriority(priority); | ||
| 161 | this.setContextClassLoader(cloader); | ||
| 162 | |||
| 163 | idle++; | ||
| 164 | } | ||
| 165 | |||
| 166 | public void run() { | ||
| 167 | |||
| 168 | while(!terminated) { | ||
| 169 | Runnable job = null; | ||
| 170 | |||
| 171 | synchronized(jobList) { | ||
| 172 | if (jobList.size() > 0) { | ||
| 173 | job = jobList.remove(0); | ||
| 174 | if (jobList.size() > 0) { | ||
| 175 | jobList.notify(); | ||
| 176 | } | ||
| 177 | |||
| 178 | } else { | ||
| 179 | try { | ||
| 180 | jobList.wait(); | ||
| 181 | } catch (InterruptedException ie) { | ||
| 182 | // terminated ? | ||
| 183 | } finally { | ||
| 184 | } | ||
| 185 | continue; | ||
| 186 | } | ||
| 187 | } | ||
| 188 | if (job != null) { | ||
| 189 | try { | ||
| 190 | idle--; | ||
| 191 | job.run(); | ||
| 192 | } catch (Exception e) { | ||
| 193 | // TODO | ||
| 194 | e.printStackTrace(); | ||
| 195 | } finally { | ||
| 196 | idle++; | ||
| 197 | } | ||
| 198 | } | ||
| 199 | |||
| 200 | // re-init | ||
| 201 | this.setPriority(priority); | ||
| 202 | this.interrupted(); | ||
| 203 | this.setContextClassLoader(cloader); | ||
| 204 | } | ||
| 205 | } | ||
| 206 | } | ||
| 207 | |||
| 208 | // private methods | ||
| 209 | private void stateCheck() throws IllegalStateException { | ||
| 210 | if (terminated) { | ||
| 211 | throw new IllegalStateException("The thread service has been terminated."); | ||
| 212 | } | ||
| 213 | } | ||
| 214 | |||
| 215 | private void createThread() { | ||
| 216 | if (idle < 1) { | ||
| 217 | synchronized(threadList) { | ||
| 218 | if (jobList.size() > 0 && currThreds < minThreads) { | ||
| 219 | ExecutorThread et = new ExecutorThread(); | ||
| 220 | et.start(); | ||
| 221 | threadList[currThreds++] = et; | ||
| 222 | } | ||
| 223 | } | ||
| 224 | } | ||
| 225 | } | ||
| 226 | |||
| 227 | |||
| 228 | // protected or private variables | ||
| 229 | // ------------------------------ | ||
| 230 | private ArrayList<Runnable> jobList = new ArrayList<Runnable>(0); | ||
| 231 | |||
| 232 | private ExecutorThread[] threadList; | ||
| 233 | private int minThreads = 1; | ||
| 234 | private int currThreds = 0; | ||
| 235 | private int idle = 0; | ||
| 236 | |||
| 237 | private boolean terminated = false; | ||
| 238 | private int priority; | ||
| 239 | private ThreadGroup threadGroup = new ThreadGroup("ThreadService"); | ||
| 240 | private ClassLoader cloader; | ||
| 241 | |||
| 242 | private static long counter = 0; | ||
| 243 | |||
| 244 | private int addedJobs = 1; | ||
| 245 | private int doneJobs = 1; | ||
| 246 | } | ||