/*
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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.launcher3.util;
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import android.os.Looper;
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import android.os.MessageQueue;
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/**
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* Utility class to block execution until the UI looper is idle.
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*/
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public class LooperIdleLock implements MessageQueue.IdleHandler, Runnable {
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private final Object mLock;
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private boolean mIsLocked;
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public LooperIdleLock(Object lock, Looper looper) {
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mLock = lock;
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mIsLocked = true;
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looper.getQueue().addIdleHandler(this);
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}
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@Override
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public void run() {
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Looper.myQueue().addIdleHandler(this);
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}
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@Override
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public boolean queueIdle() {
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synchronized (mLock) {
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mIsLocked = false;
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mLock.notify();
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}
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return false;
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}
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public boolean awaitLocked(long ms) {
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if (mIsLocked) {
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try {
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// Just in case mFlushingWorkerThread changes but we aren't woken up,
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// wait no longer than 1sec at a time
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mLock.wait(ms);
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} catch (InterruptedException ex) {
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// Ignore
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}
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}
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return mIsLocked;
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}
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}
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