Merge QP1A.181119.002

Change-Id: Ieb6ae3730e8b01f867f9b5120de1ab3067653d21

1 files changed, 53 insertions, 0 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/InitController.java b/packages/SystemUI/src/com/android/systemui/InitController.java
new file mode 100644
index 000000000000..81d32517b27a
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/InitController.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2018 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.systemui;
+
+import java.util.ArrayList;
+
+/**
+ * Created by {@link Dependency} on SystemUI startup. Add tasks which need to be executed only
+ * after all other dependencies have been created.
+ */
+public class InitController {
+
+    /**
+     * If a task is added after all tasks are executed, then we've done something terribly wrong
+     */
+    private boolean mTasksExecuted = false;
+
+    private final ArrayList<Runnable> mTasks = new ArrayList<>();
+
+    /**
+     * Add a task to be executed after {@link Dependency#start()}
+     * @param runnable the task to be executed
+     */
+    public void addPostInitTask(Runnable runnable) {
+        if (mTasksExecuted) {
+            throw new IllegalStateException("post init tasks have already been executed!");
+        }
+        mTasks.add(runnable);
+    }
+
+    /**
+     * Run post-init tasks and remove them from the tasks list
+     */
+    public void executePostInitTasks() {
+        while (!mTasks.isEmpty()) {
+            mTasks.remove(0).run();
+        }
+
+        mTasksExecuted = true;
+    }
+}