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diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/core/src/main/java/org/apache/tuscany/sca/core/work/impl/ThreadPoolWorkManager.java b/sca-java-2.x/tags/2.0.1-RC1/modules/core/src/main/java/org/apache/tuscany/sca/core/work/impl/ThreadPoolWorkManager.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.core.work.impl;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.RejectedExecutionException;
+import java.util.concurrent.ThreadFactory;
+
+import org.apache.tuscany.sca.work.WorkSchedulerException;
+
+/**
+ * A thread-pool based implementation for the JSR-237 work manager.
+ * <p/>
+ * <p/>
+ * This implementation supports only local work.
+ * <p/>
+ * TODO Elaborate the implementation. </p>
+ *
+ * @version $Rev$ $Date$
+ */
+public class ThreadPoolWorkManager {
+
+ // Map of work items currently handled by the work manager
+ private Map<WorkItem, WorkListener> workItems = new ConcurrentHashMap<WorkItem, WorkListener>();
+
+ // Thread-pool
+ protected ExecutorService executor;
+
+ /**
+ * Initializes the thread-pool.
+ *
+ * @param threadPoolSize Thread-pool size. If the size <1, then a cached pool is created
+ */
+ public ThreadPoolWorkManager(int threadPoolSize) {
+ ThreadFactory factory = new ThreadFactory() {
+ public Thread newThread(Runnable r) {
+ Thread thread = new Thread(r);
+ thread.setDaemon(true);
+ return thread;
+ }
+ };
+ if (threadPoolSize <= 0) {
+
+ // Creates a new Executor, use a custom ThreadFactory that
+ // creates daemon threads.
+ executor = Executors.newCachedThreadPool(factory);
+ } else {
+ executor = Executors.newFixedThreadPool(threadPoolSize, factory);
+ }
+ }
+
+ /**
+ * Schedules a unit of work asynchronously.
+ *
+ * @param work Work that needs to be scheduled.
+ * @return Work Work item representing the asynchronous work
+ */
+ public WorkItem schedule(Work work) throws IllegalArgumentException {
+ return schedule(work, null);
+ }
+
+ /**
+ * Schedules a unit of work asynchronously.
+ *
+ * @param work Work that needs to be scheduled.
+ * @param workListener Work listener for callbacks.
+ * @return Work Work item representing the asynchronous work
+ */
+ public WorkItem schedule(Work work, WorkListener workListener) throws IllegalArgumentException {
+
+ WorkItem workItem = new WorkItem(UUID.randomUUID().toString(), work);
+ if (workListener != null) {
+ workItems.put(workItem, workListener);
+ }
+ workAccepted(workItem, work);
+ if (scheduleWork(work, workItem)) {
+ return workItem;
+ } else {
+ workItem.setStatus(WorkEvent.WORK_REJECTED);
+ if (workListener != null) {
+ workListener.workRejected(new WorkEvent(workItem));
+ }
+ throw new IllegalArgumentException("Unable to schedule work");
+ }
+ }
+
+ /**
+ * Wait for all the specified units of work to finish.
+ *
+ * @param works Units of the work that need to finish.
+ * @param timeout Timeout for waiting for the units of work to finish.
+ */
+ public boolean waitForAll(Collection works, long timeout) {
+ throw new UnsupportedOperationException("waitForAll not supported");
+ }
+
+ /**
+ * Wait for any of the specified units of work to finish.
+ *
+ * @param works Units of the work that need to finish.
+ * @param timeout Timeout for waiting for the units of work to finish.
+ */
+ public Collection waitForAny(Collection works, long timeout) {
+ throw new UnsupportedOperationException("waitForAny not supported");
+ }
+
+ /**
+ * Method provided for subclasses to indicate a work acceptance.
+ *
+ * @param workItem Work item representing the work that was accepted.
+ * @param work Work that was accepted.
+ */
+ private void workAccepted(final WorkItem workItem, final Work work) {
+ WorkListener listener = workItems.get(workItem);
+ if (listener != null) {
+ workItem.setStatus(WorkEvent.WORK_ACCEPTED);
+ WorkEvent event = new WorkEvent(workItem);
+ listener.workAccepted(event);
+ }
+ }
+
+ /*
+ * Method to indicate a work start.
+ */
+ private void workStarted(final WorkItem workItem, final Work work) {
+ WorkListener listener = workItems.get(workItem);
+ if (listener != null) {
+ workItem.setStatus(WorkEvent.WORK_STARTED);
+ WorkEvent event = new WorkEvent(workItem);
+ listener.workStarted(event);
+ }
+ }
+
+ /*
+ * Method to indicate a work completion.
+ */
+ private void workCompleted(final WorkItem workItem, final Work work) {
+ workCompleted(workItem, work, null);
+ }
+
+ /*
+ * Method to indicate a work completion.
+ */
+ private void workCompleted(final WorkItem workItem, final Work work, final WorkSchedulerException exception) {
+ WorkListener listener = workItems.get(workItem);
+ if (listener != null) {
+ workItem.setStatus(WorkEvent.WORK_COMPLETED);
+ workItem.setResult(work);
+ workItem.setException(exception);
+ WorkEvent event = new WorkEvent(workItem);
+ listener.workCompleted(event);
+ workItems.remove(workItem);
+ }
+ }
+
+ /*
+ * Schedules the work using the ThreadPool.
+ */
+ private boolean scheduleWork(final Work work, final WorkItem workItem) {
+ try {
+ executor.execute(new DecoratingWork(workItem, work));
+ return true;
+ } catch (RejectedExecutionException ex) {
+ return false;
+ }
+ }
+
+ /*
+ * Class that decorates the original worker so that it can get callbacks when work is done.
+ */
+ private final class DecoratingWork implements Runnable {
+
+ // Work item for this work.
+ private WorkItem workItem;
+
+ // The original work.
+ private Work decoratedWork;
+
+ /*
+ * Initializes the work item and underlying work.
+ */
+ private DecoratingWork(final WorkItem workItem, final Work decoratedWork) {
+ this.workItem = workItem;
+ this.decoratedWork = decoratedWork;
+ }
+
+ /*
+ * Overrides the run method.
+ */
+ public void run() {
+ workStarted(workItem, decoratedWork);
+ try {
+ decoratedWork.run();
+ workCompleted(workItem, decoratedWork);
+ } catch (Throwable th) {
+ workCompleted(workItem, decoratedWork, new WorkSchedulerException(th.getMessage(), th));
+ }
+ }
+
+ }
+
+ public void destroy() {
+ executor.shutdown();
+ }
+
+ public ExecutorService getExecutorService() {
+ return executor;
+ }
+
+}
+