1 files changed, 88 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/filtershow/pipeline/ProcessingTask.java b/src/com/android/gallery3d/filtershow/pipeline/ProcessingTask.java
new file mode 100644
index 000000000..8d3e8110f
--- /dev/null
+++ b/src/com/android/gallery3d/filtershow/pipeline/ProcessingTask.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2013 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.filtershow.pipeline;
+
+import android.content.Context;
+import android.os.Handler;
+import android.os.Message;
+
+public abstract class ProcessingTask {
+    private ProcessingTaskController mTaskController;
+    private Handler mProcessingHandler;
+    private Handler mResultHandler;
+    private int mType;
+    private static final int DELAY = 300;
+
+    static interface Request {}
+    static interface Update {}
+    static interface Result {}
+
+    public boolean postRequest(Request message) {
+        Message msg = mProcessingHandler.obtainMessage(mType);
+        msg.obj = message;
+        if (isPriorityTask()) {
+            if (mProcessingHandler.hasMessages(getType())) {
+                return false;
+            }
+            mProcessingHandler.sendMessageAtFrontOfQueue(msg);
+        } else if (isDelayedTask()) {
+            if (mProcessingHandler.hasMessages(getType())) {
+                mProcessingHandler.removeMessages(getType());
+            }
+            mProcessingHandler.sendMessageDelayed(msg, DELAY);
+        } else {
+            mProcessingHandler.sendMessage(msg);
+        }
+        return true;
+    }
+
+    public void postUpdate(Update message) {
+        Message msg = mResultHandler.obtainMessage(mType);
+        msg.obj = message;
+        msg.arg1 = ProcessingTaskController.UPDATE;
+        mResultHandler.sendMessage(msg);
+    }
+
+    public void processRequest(Request message) {
+        Object result = doInBackground(message);
+        Message msg = mResultHandler.obtainMessage(mType);
+        msg.obj = result;
+        msg.arg1 = ProcessingTaskController.RESULT;
+        mResultHandler.sendMessage(msg);
+    }
+
+    public void added(ProcessingTaskController taskController) {
+        mTaskController = taskController;
+        mResultHandler = taskController.getResultHandler();
+        mProcessingHandler = taskController.getProcessingHandler();
+        mType = taskController.getReservedType();
+    }
+
+    public int getType() {
+        return mType;
+    }
+
+    public Context getContext() {
+        return mTaskController.getContext();
+    }
+
+    public abstract Result doInBackground(Request message);
+    public abstract void onResult(Result message);
+    public void onUpdate(Update message) {}
+    public boolean isPriorityTask() { return false; }
+    public boolean isDelayedTask() { return false; }
+}