Source Code Cross Referenced for SimpleTaskWorkManager.java in  » J2EE » spring-framework-2.0.6 » org » springframework » jca » work » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.jca.work 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.jca.work;
018:
019:        import javax.resource.spi.work.ExecutionContext;
020:        import javax.resource.spi.work.Work;
021:        import javax.resource.spi.work.WorkAdapter;
022:        import javax.resource.spi.work.WorkCompletedException;
023:        import javax.resource.spi.work.WorkEvent;
024:        import javax.resource.spi.work.WorkException;
025:        import javax.resource.spi.work.WorkListener;
026:        import javax.resource.spi.work.WorkManager;
027:        import javax.resource.spi.work.WorkRejectedException;
028:
029:        import org.springframework.core.task.AsyncTaskExecutor;
030:        import org.springframework.core.task.SimpleAsyncTaskExecutor;
031:        import org.springframework.core.task.SyncTaskExecutor;
032:        import org.springframework.core.task.TaskExecutor;
033:        import org.springframework.core.task.TaskRejectedException;
034:        import org.springframework.core.task.TaskTimeoutException;
035:        import org.springframework.util.Assert;
036:
037:        /**
038:         * Simple JCA 1.5 {@link javax.resource.spi.work.WorkManager} implementation that
039:         * delegates to a Spring {@link org.springframework.core.task.TaskExecutor}.
040:         * Provides simple task execution including start timeouts, but without support
041:         * for a JCA ExecutionContext (i.e. without support for imported transactions).
042:         *
043:         * <p>Uses a {@link org.springframework.core.task.SyncTaskExecutor} for {@link #doWork}
044:         * calls and a {@link org.springframework.core.task.SimpleAsyncTaskExecutor}
045:         * for {@link #startWork} and {@link #scheduleWork} calls, by default.
046:         * These default task executors can be overridden through configuration.
047:         *
048:         * <p><b>NOTE: This WorkManager does not provide thread pooling by default!</b>
049:         * Specify a {@link org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor}
050:         * (or any other thread-pooling TaskExecutor) as "asyncTaskExecutor" in order to
051:         * achieve actual thread pooling.
052:         *
053:         * <p>This WorkManager automatically detects a specified
054:         * {@link org.springframework.core.task.AsyncTaskExecutor} implementation
055:         * and uses its extended timeout functionality where appropriate.
056:         * JCA WorkListeners are fully supported in any case.
057:         *
058:         * @author Juergen Hoeller
059:         * @since 2.0.3
060:         * @see #setSyncTaskExecutor
061:         * @see #setAsyncTaskExecutor
062:         */
063:        public class SimpleTaskWorkManager implements  WorkManager {
064:
065:            private TaskExecutor syncTaskExecutor = new SyncTaskExecutor();
066:
067:            private TaskExecutor asyncTaskExecutor = new SimpleAsyncTaskExecutor();
068:
069:            /**
070:             * Specify the TaskExecutor to use for <i>synchronous</i> work execution
071:             * (i.e. {@link #doWork} calls).
072:             * <p>Default is a {@link org.springframework.core.task.SyncTaskExecutor}.
073:             */
074:            public void setSyncTaskExecutor(TaskExecutor syncTaskExecutor) {
075:                this .syncTaskExecutor = syncTaskExecutor;
076:            }
077:
078:            /**
079:             * Specify the TaskExecutor to use for <i>asynchronous</i> work execution
080:             * (i.e. {@link #startWork} and {@link #scheduleWork} calls).
081:             * <p>This will typically (but not necessarily) be an
082:             * {@link org.springframework.core.task.AsyncTaskExecutor} implementation.
083:             * Default is a {@link org.springframework.core.task.SimpleAsyncTaskExecutor}.
084:             */
085:            public void setAsyncTaskExecutor(TaskExecutor asyncTaskExecutor) {
086:                this .asyncTaskExecutor = asyncTaskExecutor;
087:            }
088:
089:            public void doWork(Work work) throws WorkException {
090:                doWork(work, WorkManager.INDEFINITE, null, null);
091:            }
092:
093:            public void doWork(Work work, long startTimeout,
094:                    ExecutionContext executionContext, WorkListener workListener)
095:                    throws WorkException {
096:
097:                Assert.state(this .syncTaskExecutor != null,
098:                        "No 'syncTaskExecutor' set");
099:                executeWork(this .syncTaskExecutor, work, startTimeout, false,
100:                        executionContext, workListener);
101:            }
102:
103:            public long startWork(Work work) throws WorkException {
104:                return startWork(work, WorkManager.INDEFINITE, null, null);
105:            }
106:
107:            public long startWork(Work work, long startTimeout,
108:                    ExecutionContext executionContext, WorkListener workListener)
109:                    throws WorkException {
110:
111:                Assert.state(this .asyncTaskExecutor != null,
112:                        "No 'asyncTaskExecutor' set");
113:                return executeWork(this .asyncTaskExecutor, work, startTimeout,
114:                        true, executionContext, workListener);
115:            }
116:
117:            public void scheduleWork(Work work) throws WorkException {
118:                scheduleWork(work, WorkManager.INDEFINITE, null, null);
119:            }
120:
121:            public void scheduleWork(Work work, long startTimeout,
122:                    ExecutionContext executionContext, WorkListener workListener)
123:                    throws WorkException {
124:
125:                Assert.state(this .asyncTaskExecutor != null,
126:                        "No 'asyncTaskExecutor' set");
127:                executeWork(this .asyncTaskExecutor, work, startTimeout, false,
128:                        executionContext, workListener);
129:            }
130:
131:            /**
132:             * Execute the given Work on the specified TaskExecutor.
133:             * @param taskExecutor the TaskExecutor to use
134:             * @param work the Work to execute
135:             * @param startTimeout the time duration within which the Work is supposed to start
136:             * @param blockUntilStarted whether to block until the Work has started
137:             * @param executionContext the JCA ExecutionContext for the given Work
138:             * @param workListener the WorkListener to clal for the given Work
139:             * @return the time elapsed from Work acceptance until start of execution
140:             * (or -1 if not applicable or not known)
141:             * @throws WorkException if the TaskExecutor did not accept the Work
142:             */
143:            protected long executeWork(TaskExecutor taskExecutor, Work work,
144:                    long startTimeout, boolean blockUntilStarted,
145:                    ExecutionContext executionContext, WorkListener workListener)
146:                    throws WorkException {
147:
148:                if (executionContext != null
149:                        && executionContext.getXid() != null) {
150:                    throw new WorkException(
151:                            "SimpleTaskWorkManager does not supported imported XIDs: "
152:                                    + executionContext.getXid());
153:                }
154:                WorkListener workListenerToUse = workListener;
155:                if (workListenerToUse == null) {
156:                    workListenerToUse = new WorkAdapter();
157:                }
158:
159:                boolean isAsync = (taskExecutor instanceof  AsyncTaskExecutor);
160:                DelegatingWorkAdapter workHandle = new DelegatingWorkAdapter(
161:                        work, workListenerToUse, !isAsync);
162:                try {
163:                    if (isAsync) {
164:                        ((AsyncTaskExecutor) taskExecutor).execute(workHandle,
165:                                startTimeout);
166:                    } else {
167:                        taskExecutor.execute(workHandle);
168:                    }
169:                } catch (TaskTimeoutException ex) {
170:                    WorkException wex = new WorkRejectedException(
171:                            "TaskExecutor rejected Work because of timeout: "
172:                                    + work, ex);
173:                    wex.setErrorCode(WorkException.START_TIMED_OUT);
174:                    workListenerToUse.workRejected(new WorkEvent(this ,
175:                            WorkEvent.WORK_REJECTED, work, wex));
176:                    throw wex;
177:                } catch (TaskRejectedException ex) {
178:                    WorkException wex = new WorkRejectedException(
179:                            "TaskExecutor rejected Work: " + work, ex);
180:                    wex.setErrorCode(WorkException.INTERNAL);
181:                    workListenerToUse.workRejected(new WorkEvent(this ,
182:                            WorkEvent.WORK_REJECTED, work, wex));
183:                    throw wex;
184:                } catch (Throwable ex) {
185:                    WorkException wex = new WorkException(
186:                            "TaskExecutor failed to execute Work: " + work, ex);
187:                    wex.setErrorCode(WorkException.INTERNAL);
188:                    throw wex;
189:                }
190:                if (isAsync) {
191:                    workListenerToUse.workAccepted(new WorkEvent(this ,
192:                            WorkEvent.WORK_ACCEPTED, work, null));
193:                }
194:
195:                if (blockUntilStarted) {
196:                    long acceptanceTime = System.currentTimeMillis();
197:                    synchronized (workHandle.monitor) {
198:                        try {
199:                            while (!workHandle.started) {
200:                                workHandle.monitor.wait();
201:                            }
202:                        } catch (InterruptedException ex) {
203:                            Thread.currentThread().interrupt();
204:                        }
205:                    }
206:                    return (System.currentTimeMillis() - acceptanceTime);
207:                } else {
208:                    return WorkManager.UNKNOWN;
209:                }
210:            }
211:
212:            /**
213:             * Work adapter that supports start timeouts and WorkListener callbacks
214:             * for a given Work that it delegates to.
215:             */
216:            private static class DelegatingWorkAdapter implements  Work {
217:
218:                private final Work work;
219:
220:                private final WorkListener workListener;
221:
222:                private final boolean acceptOnExecution;
223:
224:                public final Object monitor = new Object();
225:
226:                public boolean started = false;
227:
228:                public DelegatingWorkAdapter(Work work,
229:                        WorkListener workListener, boolean acceptOnExecution) {
230:                    this .work = work;
231:                    this .workListener = workListener;
232:                    this .acceptOnExecution = acceptOnExecution;
233:                }
234:
235:                public void run() {
236:                    if (this .acceptOnExecution) {
237:                        this .workListener.workAccepted(new WorkEvent(this ,
238:                                WorkEvent.WORK_ACCEPTED, work, null));
239:                    }
240:                    synchronized (this .monitor) {
241:                        this .started = true;
242:                        this .monitor.notify();
243:                    }
244:                    this .workListener.workStarted(new WorkEvent(this ,
245:                            WorkEvent.WORK_STARTED, this .work, null));
246:                    try {
247:                        this .work.run();
248:                    } catch (RuntimeException ex) {
249:                        this .workListener.workCompleted(new WorkEvent(this ,
250:                                WorkEvent.WORK_COMPLETED, this .work,
251:                                new WorkCompletedException(ex)));
252:                        throw ex;
253:                    } catch (Error err) {
254:                        this .workListener.workCompleted(new WorkEvent(this ,
255:                                WorkEvent.WORK_COMPLETED, this .work,
256:                                new WorkCompletedException(err)));
257:                        throw err;
258:                    }
259:                    this .workListener.workCompleted(new WorkEvent(this ,
260:                            WorkEvent.WORK_COMPLETED, this .work, null));
261:                }
262:
263:                public void release() {
264:                    this.work.release();
265:                }
266:            }
267:
268:        }
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