| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "The Jakarta Project", "Ant", and "Apache Software |
| * Foundation" must not be used to endorse or promote products derived |
| * from this software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| package org.apache.ant.antlib.system; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import org.apache.ant.common.antlib.AbstractTask; |
| import org.apache.ant.common.antlib.AntContext; |
| |
| import org.apache.ant.common.antlib.Task; |
| import org.apache.ant.common.antlib.TaskContainer; |
| import org.apache.ant.common.service.ExecService; |
| import org.apache.ant.common.util.ExecutionException; |
| import org.apache.ant.common.util.Location; |
| |
| /** |
| * Implements a multi threaded task execution. |
| * |
| * @author Thomas Christen <a href="mailto:chr@active.ch">chr@active.ch</a> |
| * @author <a href="mailto:conor@apache.org">Conor MacNeill </a> |
| * @created 27 February 2002 |
| */ |
| public class Parallel extends AbstractTask |
| implements TaskContainer { |
| |
| /** |
| * Class which stores information about the thread to which each task is |
| * associated |
| * |
| * @author <a href="mailto:conor@apache.org">Conor MacNeill</a> |
| * @created 27 February 2002 |
| */ |
| private class TaskThread extends Thread { |
| /** The exception thrown, if any, by the task running in this thread */ |
| private Throwable exception; |
| /** The task running is this thread */ |
| private Task task; |
| /** An identifier for the thread */ |
| private int taskNumber; |
| |
| /** |
| * Construct a new TaskThread |
| * |
| * @param task the Task to be executed in a seperate thread |
| * @param taskNumber the thread's identifier |
| */ |
| TaskThread(int taskNumber, Task task) { |
| this.task = task; |
| this.taskNumber = taskNumber; |
| } |
| |
| /** |
| * Get the exception thrown by the task, if any. |
| * |
| * @return the Throwable instance thrown by the task or null if |
| * nothing was thrown. |
| */ |
| public Throwable getException() { |
| return exception; |
| } |
| |
| /** |
| * Executes the task within a thread and takes care about Exceptions |
| * raised within the task. |
| */ |
| public void run() { |
| try { |
| AntContext context = getAntContext(); |
| ExecService execService |
| = (ExecService)context.getCoreService(ExecService.class); |
| execService.executeTask(task); |
| } catch (Throwable t) { |
| exception = t; |
| } |
| } |
| } |
| |
| /** Collection holding the nested tasks */ |
| private List nestedTasks = new ArrayList(); |
| |
| |
| /** |
| * Add a nested task to execute parallel (asynchron). |
| * |
| * @param nestedTask Nested task to be executed in parallel |
| */ |
| public void addNestedTask(Task nestedTask) { |
| nestedTasks.add(nestedTask); |
| } |
| |
| /** |
| * Block execution until the specified time or for a specified amount of |
| * milliseconds and if defined, execute the wait status. |
| * |
| * @exception ExecutionException if any of the nested tasks throws an |
| * exception |
| */ |
| public void execute() throws ExecutionException { |
| TaskThread[] threads = new TaskThread[nestedTasks.size()]; |
| int threadNumber = 0; |
| for (Iterator i = nestedTasks.iterator(); i.hasNext(); threadNumber++) { |
| Task nestedTask = (Task)i.next(); |
| threads[threadNumber] = new TaskThread(threadNumber, nestedTask); |
| } |
| |
| // now start all threads |
| for (int i = 0; i < threads.length; ++i) { |
| threads[i].start(); |
| } |
| |
| // now join to all the threads |
| for (int i = 0; i < threads.length; ++i) { |
| try { |
| threads[i].join(); |
| } catch (InterruptedException ie) { |
| // who would interrupt me at a time like this? |
| } |
| } |
| |
| // now did any of the threads throw an exception |
| StringBuffer exceptionMessage = new StringBuffer(); |
| String lSep = System.getProperty("line.separator"); |
| int numExceptions = 0; |
| Throwable firstException = null; |
| Location firstLocation = Location.UNKNOWN_LOCATION; |
| for (int i = 0; i < threads.length; ++i) { |
| Throwable t = threads[i].getException(); |
| if (t != null) { |
| numExceptions++; |
| if (firstException == null) { |
| firstException = t; |
| } |
| if (t instanceof ExecutionException && |
| firstLocation == Location.UNKNOWN_LOCATION) { |
| firstLocation = ((ExecutionException)t).getLocation(); |
| } |
| exceptionMessage.append(lSep); |
| exceptionMessage.append(t.getMessage()); |
| } |
| } |
| |
| if (numExceptions == 1) { |
| if (firstException instanceof ExecutionException) { |
| throw (ExecutionException)firstException; |
| } else { |
| throw new ExecutionException(firstException); |
| } |
| } else if (numExceptions > 1) { |
| throw new ExecutionException(exceptionMessage.toString(), |
| firstLocation); |
| } |
| } |
| } |
| |
