1 files changed, 35 insertions, 0 deletions
diff --git a/gallerycommon/src/com/android/gallery3d/util/Future.java b/gallerycommon/src/com/android/gallery3d/util/Future.java
new file mode 100644
index 000000000..580a2a120
--- /dev/null
+++ b/gallerycommon/src/com/android/gallery3d/util/Future.java
@@ -0,0 +1,35 @@
+/*
+ * 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;
+
+// This Future differs from the java.util.concurrent.Future in these aspects:
+//
+// - Once cancel() is called, isCancelled() always returns true. It is a sticky
+//   flag used to communicate to the implementation. The implmentation may
+//   ignore that flag. Regardless whether the Future is cancelled, a return
+//   value will be provided to get(). The implementation may choose to return
+//   null if it finds the Future is cancelled.
+//
+// - get() does not throw exceptions.
+//
+public interface Future<T> {
+    public void cancel();
+    public boolean isCancelled();
+    public boolean isDone();
+    public T get();
+    public void waitDone();
+}