1 files changed, 167 insertions, 0 deletions
diff --git a/engine/src/core/com/jme3/app/AppTask.java b/engine/src/core/com/jme3/app/AppTask.java
new file mode 100644
index 0000000..1b1b68c
--- /dev/null
+++ b/engine/src/core/com/jme3/app/AppTask.java
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2009-2010 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * 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.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS 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 COPYRIGHT OWNER OR
+ * 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.
+ */
+package com.jme3.app;
+
+import java.util.concurrent.*;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * <code>AppTask</code> is used in <code>AppTaskQueue</code> to manage tasks that have
+ * yet to be accomplished. The AppTask system is used to execute tasks either
+ * in the OpenGL/Render thread, or outside of it.
+ *
+ * @author Matthew D. Hicks, lazloh
+ */
+public class AppTask<V> implements Future<V> {
+    private static final Logger logger = Logger.getLogger(AppTask.class
+            .getName());
+
+    private final Callable<V> callable;
+
+    private V result;
+    private ExecutionException exception;
+    private boolean cancelled, finished;
+    private final ReentrantLock stateLock = new ReentrantLock();
+    private final Condition finishedCondition = stateLock.newCondition();
+
+    /**
+     * Create an <code>AppTask</code> that will execute the given 
+     * {@link Callable}.
+     * 
+     * @param callable The callable to be executed
+     */
+    public AppTask(Callable<V> callable) {
+        this.callable = callable;
+    }
+
+    public boolean cancel(boolean mayInterruptIfRunning) {
+        stateLock.lock();
+        try {
+            if (result != null) {
+                return false;
+            }
+            cancelled = true;
+
+            finishedCondition.signalAll();
+
+            return true;
+        } finally {
+            stateLock.unlock();
+        }
+    }
+
+    public V get() throws InterruptedException, ExecutionException {
+        stateLock.lock();
+        try {
+            while (!isDone()) {
+                finishedCondition.await();
+            }
+            if (exception != null) {
+                throw exception;
+            }
+            return result;
+        } finally {
+            stateLock.unlock();
+        }
+    }
+
+    public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
+        stateLock.lock();
+        try {
+            if (!isDone()) {
+                finishedCondition.await(timeout, unit);
+            }
+            if (exception != null) {
+                throw exception;
+            }
+            if (result == null) {
+                throw new TimeoutException("Object not returned in time allocated.");
+            }
+            return result;
+        } finally {
+            stateLock.unlock();
+        }
+    }
+
+    public boolean isCancelled() {
+        stateLock.lock();
+        try {
+            return cancelled;
+        } finally {
+            stateLock.unlock();
+        }
+    }
+
+    public boolean isDone() {
+        stateLock.lock();
+        try {
+            return finished || cancelled || (exception != null);
+        } finally {
+            stateLock.unlock();
+        }
+    }
+
+    public Callable<V> getCallable() {
+        return callable;
+    }
+
+    public void invoke() {
+        try {
+            final V tmpResult = callable.call();
+
+            stateLock.lock();
+            try {
+                result = tmpResult;
+                finished = true;
+
+                finishedCondition.signalAll();
+            } finally {
+                stateLock.unlock();
+            }
+        } catch (Exception e) {
+            logger.logp(Level.SEVERE, this.getClass().toString(), "invoke()", "Exception", e);
+
+            stateLock.lock();
+            try {
+                exception = new ExecutionException(e);
+
+                finishedCondition.signalAll();
+            } finally {
+                stateLock.unlock();
+            }
+        }
+    }
+
+}
+\ No newline at end of file