1 files changed, 86 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/util/FutureTask.java b/src/com/android/gallery3d/util/FutureTask.java
new file mode 100644
index 000000000..9cfab27cb
--- /dev/null
+++ b/src/com/android/gallery3d/util/FutureTask.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed 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 com.android.gallery3d.util;
+
+import java.util.concurrent.Callable;
+
+// NOTE: If the Callable throws any Throwable, the result value will be null.
+public class FutureTask<T> implements Runnable, Future<T> {
+    private static final String TAG = "FutureTask";
+    private Callable<T> mCallable;
+    private FutureListener<T> mListener;
+    private volatile boolean mIsCancelled;
+    private boolean mIsDone;
+    private T mResult;
+
+    public FutureTask(Callable<T> callable, FutureListener<T> listener) {
+        mCallable = callable;
+        mListener = listener;
+    }
+
+    public FutureTask(Callable<T> callable) {
+        this(callable, null);
+    }
+
+    public void cancel() {
+        mIsCancelled = true;
+    }
+
+    public synchronized T get() {
+        while (!mIsDone) {
+            try {
+                wait();
+            } catch (InterruptedException t) {
+                // ignore.
+            }
+        }
+        return mResult;
+    }
+
+    public void waitDone() {
+        get();
+    }
+
+    public synchronized boolean isDone() {
+        return mIsDone;
+    }
+
+    public boolean isCancelled() {
+        return mIsCancelled;
+    }
+
+    public void run() {
+        T result = null;
+
+        if (!mIsCancelled) {
+            try {
+                result = mCallable.call();
+            } catch (Throwable ex) {
+                Log.w(TAG, "Exception in running a task", ex);
+            }
+        }
+
+        synchronized(this) {
+            mResult = result;
+            mIsDone = true;
+            if (mListener != null) {
+                mListener.onFutureDone(this);
+            }
+            notifyAll();
+        }
+    }
+}