1 files changed, 172 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/WorkerAnt.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/WorkerAnt.java
new file mode 100644
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+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/WorkerAnt.java
@@ -0,0 +1,172 @@
+/*
+ *  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.tools.ant.util;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.Task;
+
+/**
+ * A worker ant executes a single task in a background thread.
+ * After the run, any exception thrown is turned into a buildexception, which can be
+ * rethrown, the finished attribute is set, then notifyAll() is called,
+ * so that anyone waiting on the same notify object gets woken up.
+ * <p>
+ * This class is effectively a superset of
+ * {@link org.apache.tools.ant.taskdefs.Parallel.TaskRunnable}
+ *
+ * @since Ant 1.8
+ */
+
+public class WorkerAnt extends Thread {
+
+    private Task task;
+    private Object notify;
+    private volatile boolean finished = false;
+    private volatile BuildException buildException;
+    private volatile Throwable exception;
+
+    /**
+     * Error message if invoked with no task
+     */
+    public static final String ERROR_NO_TASK = "No task defined";
+
+
+    /**
+     * Create the worker.
+     * <p>
+     * This does not start the thread, merely configures it.
+     * @param task the task
+     * @param notify what to notify
+     */
+    public WorkerAnt(Task task, Object notify) {
+        this.task = task;
+        this.notify = notify != null ? notify : this;
+    }
+
+    /**
+     * Create the worker, using the worker as the notification point.
+     * <p>
+     * This does not start the thread, merely configures it.
+     * @param task the task
+     */
+    public WorkerAnt(Task task) {
+        this(task, null);
+    }
+
+    /**
+     * Get any build exception.
+     * This would seem to be oversynchronised, but know that Java pre-1.5 can
+     * reorder volatile access.
+     * The synchronized attribute is to force an ordering.
+     *
+     * @return the exception or null
+     */
+    public synchronized BuildException getBuildException() {
+        return buildException;
+    }
+
+    /**
+     * Get whatever was thrown, which may or may not be a buildException.
+     * Assertion: getException() instanceof BuildException &lt;=&gt; getBuildException()==getException()
+     * @return the exception.
+     */
+    public synchronized Throwable getException() {
+        return exception;
+    }
+
+
+    /**
+     * Get the task
+     * @return the task
+     */
+    public Task getTask() {
+        return task;
+    }
+
+
+    /**
+     * Query the task/thread for being finished.
+     * This would seem to be oversynchronised, but know that Java pre-1.5 can
+     * reorder volatile access.
+     * The synchronized attribute is to force an ordering.
+     * @return true if the task is finished.
+     */
+    public synchronized boolean isFinished() {
+        return finished;
+    }
+
+    /**
+     * Block on the notify object and so wait until the thread is finished.
+     * @param timeout timeout in milliseconds
+     * @throws InterruptedException if the execution was interrupted
+     */
+    public void waitUntilFinished(long timeout) throws InterruptedException {
+        synchronized (notify) {
+            if (!finished) {
+                notify.wait(timeout);
+            }
+        }
+    }
+
+    /**
+     * Raise an exception if one was caught
+     *
+     * @throws BuildException if one has been picked up
+     */
+    public void rethrowAnyBuildException() {
+        BuildException ex = getBuildException();
+        if (ex != null) {
+            throw ex;
+        }
+    }
+
+
+    /**
+     * Handle a caught exception, by recording it and possibly wrapping it
+     * in a BuildException for later rethrowing.
+     * @param thrown what was caught earlier
+     */
+    private synchronized void caught(Throwable thrown) {
+        exception = thrown;
+        buildException = (thrown instanceof BuildException)
+            ? (BuildException) thrown
+            : new BuildException(thrown);
+    }
+
+    /**
+     * Run the task, which is skipped if null.
+     * When invoked again, the task is re-run.
+     */
+    public void run() {
+        try {
+            if (task != null) {
+                task.execute();
+            }
+        } catch (Throwable thrown) {
+            caught(thrown);
+        } finally {
+            synchronized (notify) {
+                finished = true;
+                //reset the task.
+                //wake up our owner, if it is waiting
+                notify.notifyAll();
+            }
+        }
+    }
+}