/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.server;
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import static android.os.Process.THREAD_PRIORITY_DISPLAY;
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import android.os.Handler;
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import android.os.Trace;
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/**
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* Thread for handling all legacy window animations, or anything that's directly impacting
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* animations like starting windows or traversals.
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*/
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public final class AnimationThread extends ServiceThread {
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private static AnimationThread sInstance;
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private static Handler sHandler;
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private AnimationThread() {
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super("android.anim", THREAD_PRIORITY_DISPLAY, false /*allowIo*/);
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}
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private static void ensureThreadLocked() {
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if (sInstance == null) {
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sInstance = new AnimationThread();
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sInstance.start();
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sInstance.getLooper().setTraceTag(Trace.TRACE_TAG_WINDOW_MANAGER);
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sHandler = new Handler(sInstance.getLooper());
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}
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}
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public static AnimationThread get() {
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synchronized (AnimationThread.class) {
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ensureThreadLocked();
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return sInstance;
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}
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}
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public static Handler getHandler() {
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synchronized (AnimationThread.class) {
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ensureThreadLocked();
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return sHandler;
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}
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}
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}
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