TaskManager API first pass.

This is a very barebones first pass, meant to ensure we're all on the
same page, and also get feedback.

Change-Id: I7d5492dc5aafbe583f7c2d97ebf1444b6d2e068a

1 files changed, 66 insertions, 0 deletions

diff --git a/core/java/android/content/TaskManager.java b/core/java/android/content/TaskManager.java
new file mode 100644
index 0000000..d28d78a
--- /dev/null
+++ b/core/java/android/content/TaskManager.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2014 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 android.content;
+
+import java.util.List;
+
+/**
+ * Class for scheduling various types of tasks with the scheduling framework on the device.
+ *
+ * Get an instance of this class through {@link Context#getSystemService(String)}.
+ */
+public abstract class TaskManager {
+    /*
+     * Returned from {@link #schedule(Task)} when an invalid parameter was supplied. This can occur
+     * if the run-time for your task is too short, or perhaps the system can't resolve the
+     * requisite {@link TaskService} in your package.
+     */
+    static final int RESULT_INVALID_PARAMETERS = -1;
+    /**
+     * Returned from {@link #schedule(Task)} if this application has made too many requests for
+     * work over too short a time.
+     */
+    // TODO: Determine if this is necessary.
+    static final int RESULT_OVER_QUOTA = -2;
+
+    /*
+     * @param task The task you wish scheduled. See {@link Task#TaskBuilder} for more detail on
+     * the sorts of tasks you can schedule.
+     * @return If >0, this int corresponds to the taskId of the successfully scheduled task.
+     * Otherwise you have to compare the return value to the error codes defined in this class.
+     */
+    public abstract int schedule(Task task);
+
+    /**
+     * Cancel a task that is pending in the TaskManager.
+     * @param taskId unique identifier for this task. Obtain this value from the tasks returned by
+     * {@link #getAllPendingTasks()}.
+     * @return
+     */
+    public abstract void cancel(int taskId);
+
+    /**
+     * Cancel all tasks that have been registered with the TaskManager by this package.
+     */
+    public abstract void cancelAll();
+
+    /**
+     * @return a list of all the tasks registered by this package that have not yet been executed.
+     */
+    public abstract List<Task> getAllPendingTasks();
+
+}