Source Code Cross Referenced for ThreadManagerImpl.java in  » EJB-Server-JBoss-4.2.1 » aspects » org » jboss » aspects » asynchronous » concurrent » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » aspects » org.jboss.aspects.asynchronous.concurrent 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.aspects.asynchronous.concurrent;
023:
024:        import EDU.oswego.cs.dl.util.concurrent.PooledExecutor;
025:        import EDU.oswego.cs.dl.util.concurrent.ThreadFactoryUser;
026:        import org.jboss.aspects.asynchronous.AsynchronousConstants;
027:        import org.jboss.aspects.asynchronous.AsynchronousParameters;
028:        import org.jboss.aspects.asynchronous.AsynchronousTask;
029:        import org.jboss.aspects.asynchronous.AsynchronousUserTask;
030:        import org.jboss.aspects.asynchronous.ThreadManager;
031:        import org.jboss.aspects.asynchronous.ThreadManagerRequest;
032:        import org.jboss.aspects.asynchronous.ThreadManagerResponse;
033:        import org.jboss.aspects.asynchronous.common.AsynchronousEmptyTask;
034:        import org.jboss.aspects.asynchronous.common.ThreadManagerResponseImpl;
035:
036:        /**
037:         * @author <a href="mailto:chussenet@yahoo.com">{Claude Hussenet Independent Consultant}</a>.
038:         * @version <tt>$Revision: 57186 $</tt>
039:         */
040:
041:        public class ThreadManagerImpl
042:
043:        extends ThreadFactoryUser
044:
045:        implements  AsynchronousConstants, ThreadManager {
046:
047:            protected PooledExecutor _pooledExecutor = null;
048:
049:            protected boolean waitWhenPoolSizeIsFull = true;
050:
051:            protected boolean isPooling = true;
052:
053:            /**
054:             * Create a new pool with all default settings
055:             */
056:
057:            public ThreadManagerImpl() {
058:
059:                _pooledExecutor = new PooledExecutor();
060:
061:                setWaitWhenPoolSizeIsFull(false);
062:
063:            }
064:
065:            /**
066:             * Create a new pool with all default settings except
067:             * <p/>
068:             * for maximum pool size.
069:             */
070:
071:            public ThreadManagerImpl(int maximumPoolSize) {
072:
073:                _pooledExecutor = new PooledExecutor(maximumPoolSize);
074:
075:                setWaitWhenPoolSizeIsFull(false);
076:
077:            }
078:
079:            /**
080:             * Set the minimum number of threads to use.
081:             *
082:             * @throws IllegalArgumentException if less than zero. (It is not
083:             *                                  <p/>
084:             *                                  considered an error to set the minimum to be greater than the
085:             *                                  <p/>
086:             *                                  maximum. However, in this case there are no guarantees about
087:             *                                  <p/>
088:             *                                  behavior.)
089:             */
090:
091:            public void setMaximumPoolSize(int maximumPoolSize) {
092:
093:                _pooledExecutor.setMaximumPoolSize(maximumPoolSize);
094:
095:            }
096:
097:            /**
098:             * Set the policy for blocked execution to be to wait until a thread
099:             * <p/>
100:             * is available.
101:             * <p/>
102:             * <p/>
103:             * <p/>
104:             * OR
105:             * <p/>
106:             * <p/>
107:             * <p/>
108:             * Set the policy for blocked execution to be to
109:             * <p/>
110:             * throw a RuntimeException.
111:             */
112:
113:            public void setWaitWhenPoolSizeIsFull(boolean value) {
114:
115:                if (value)
116:
117:                    _pooledExecutor.waitWhenBlocked();
118:
119:                else
120:
121:                    _pooledExecutor.abortWhenBlocked();
122:
123:                waitWhenPoolSizeIsFull = value;
124:
125:            }
126:
127:            /**
128:             * return the policy when the pool is full
129:             */
130:
131:            public boolean getWaitWhenPoolSizeIsFull() {
132:
133:                return waitWhenPoolSizeIsFull;
134:
135:            }
136:
137:            /**
138:             * Return the maximum number of threads to simultaneously execute
139:             */
140:
141:            public int getMaximumPoolSize() {
142:
143:                return _pooledExecutor.getMaximumPoolSize();
144:
145:            }
146:
147:            /**
148:             * Set the minimum number of threads to use.
149:             *
150:             * @throws IllegalArgumentException if less than zero. (It is not
151:             *                                  <p/>
152:             *                                  considered an error to set the minimum to be greater than the
153:             *                                  <p/>
154:             *                                  maximum. However, in this case there are no guarantees about
155:             *                                  <p/>
156:             *                                  behavior.)
157:             */
158:
159:            public void setMinimumPoolSize(int minimumPoolSize) {
160:
161:                _pooledExecutor.setMinimumPoolSize(minimumPoolSize);
162:
163:            }
164:
165:            /**
166:             * Return the minimum number of threads to simultaneously execute.
167:             * <p/>
168:             * (Default value is 1).  If fewer than the mininum number are
169:             * <p/>
170:             * running upon reception of a new request, a new thread is started
171:             * <p/>
172:             * to handle this request.
173:             */
174:
175:            public int getMinimumPoolSize() {
176:
177:                return _pooledExecutor.getMinimumPoolSize();
178:
179:            }
180:
181:            /**
182:             * Set the number of milliseconds to keep threads alive waiting for
183:             * <p/>
184:             * new commands. A negative value means to wait forever. A zero
185:             * <p/>
186:             * value means not to wait at all.
187:             */
188:
189:            public void setKeepAliveTime(long time) {
190:
191:                _pooledExecutor.setKeepAliveTime(time);
192:
193:            }
194:
195:            /**
196:             * Return the number of milliseconds to keep threads alive waiting
197:             * <p/>
198:             * for new commands. A negative value means to wait forever. A zero
199:             * <p/>
200:             * value means not to wait at all.
201:             */
202:
203:            public long getKeepAliveTime() {
204:
205:                return _pooledExecutor.getKeepAliveTime();
206:
207:            }
208:
209:            /**
210:             * Return the current number of active threads in the pool.  This
211:             * <p/>
212:             * number is just a snaphot, and may change immediately upon
213:             * <p/>
214:             * returning
215:             */
216:
217:            public long getPoolSize() {
218:
219:                return _pooledExecutor.getPoolSize();
220:
221:            }
222:
223:            /**
224:             * Return the response from an asynchronous task
225:             * <p/>
226:             * The call returns within the timeout defined
227:             * <p/>
228:             * in the process method
229:             */
230:
231:            public ThreadManagerResponse waitForResponse(AsynchronousTask input) {
232:
233:                AsynchronousTask[] tTask = { input };
234:
235:                return waitForResponses(tTask)[0];
236:
237:            }
238:
239:            /**
240:             * Return an array of responses from an array of asynchronous task
241:             * <p/>
242:             * The call returns within the maximum timeout from the array of tasks
243:             */
244:
245:            public ThreadManagerResponse[] waitForResponses(
246:                    AsynchronousTask[] inputImpl) {
247:
248:                if (inputImpl == null) {
249:
250:                    System.err
251:                            .println("PPMImpl:waitForResponses NULL PARAMETER");
252:
253:                    return null;
254:
255:                }
256:
257:                ThreadManagerResponse[] response =
258:
259:                new ThreadManagerResponseImpl[inputImpl.length];
260:
261:                for (int i = 0; i < inputImpl.length; i++) {
262:
263:                    AsynchronousTask fr = inputImpl[i];
264:
265:                    response[i] = fr.getResponse();
266:
267:                }
268:
269:                return response;
270:
271:            }
272:
273:            public AsynchronousTask process(ThreadManagerRequest ppmRequest) {
274:
275:                return process(ppmRequest.getId(),
276:
277:                ppmRequest.getTaskClassImpl(),
278:
279:                ppmRequest.getInputParameters(),
280:
281:                ppmRequest.getTimeout());
282:
283:            }
284:
285:            /**
286:             * Create, start and return a new asynchronous task from :
287:             * <p/>
288:             * <p/>
289:             * <p/>
290:             * <p><b>taskImpl</b> class instance defining the task to process
291:             * <p/>
292:             * <p><b>inputParametersImpl</b> class instance defining the input parameters
293:             * <p/>
294:             * <p><b>timeout</b> defined the given time limit to process the task
295:             */
296:
297:            private AsynchronousTask process(String id,
298:
299:            AsynchronousUserTask taskImpl,
300:
301:            AsynchronousParameters inputParametersImpl,
302:
303:            long timeout) {
304:
305:                try {
306:
307:                    if (this .getPoolSize() + 1 > this .getMaximumPoolSize())
308:
309:                        System.err
310:                                .println("process: The maximum pool size defined at "
311:
312:                                        + this .getMaximumPoolSize()
313:
314:                                        + " is reached before processing task["
315:
316:                                        + id
317:
318:                                        + "] !");
319:
320:                    org.jboss.aspects.asynchronous.concurrent.AsynchronousTask ft =
321:
322:                    new AsynchronousTaskImpl(id,
323:
324:                    taskImpl,
325:
326:                    inputParametersImpl,
327:
328:                    timeout);
329:
330:                    Runnable cmd = ft.add();
331:
332:                    if (isPooling())
333:
334:                        _pooledExecutor.execute(cmd);
335:
336:                    else {
337:
338:                        Thread thread = getThreadFactory().newThread(cmd);
339:
340:                        thread.start();
341:
342:                    }
343:
344:                    Thread.yield();
345:
346:                    Thread.sleep(0);
347:
348:                    Thread.yield();
349:
350:                    return ft;
351:
352:                } catch (Exception e) {
353:
354:                    return new AsynchronousEmptyTask(id,
355:
356:                    AsynchronousConstants.CAN_NOT_PROCESS,
357:
358:                    e,
359:
360:                    e.getMessage(),
361:
362:                    System.currentTimeMillis());
363:
364:                }
365:
366:            }
367:
368:            public boolean isPooling() {
369:
370:                return isPooling;
371:
372:            }
373:
374:            public void setPooling(boolean isPooling) {
375:
376:                this.isPooling = isPooling;
377:
378:            }
379:
380:        }
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