/*
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* Copyright (C) 2014 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.camera.async;
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import static com.google.common.base.Preconditions.checkState;
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import android.os.Handler;
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import android.os.Looper;
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import com.google.common.annotations.VisibleForTesting;
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import javax.annotation.Nonnull;
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public class MainThread extends HandlerExecutor {
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private MainThread(Handler handler) {
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super(handler);
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}
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public static MainThread create() {
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return new MainThread(new Handler(Looper.getMainLooper()));
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}
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/**
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* Caches whether or not the current thread is the main thread.
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*/
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private static final ThreadLocal<Boolean> sIsMainThread = new ThreadLocal<Boolean>() {
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@Override
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protected Boolean initialValue() {
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return Looper.getMainLooper().getThread() == Thread.currentThread();
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}
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};
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/**
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* Asserts that the current thread is the main thread.
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*/
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public static void checkMainThread() {
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checkState(sIsMainThread.get(), "Not main thread.");
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}
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/**
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* Returns true if the method is run on the main android thread.
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*/
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public static boolean isMainThread() {
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return sIsMainThread.get();
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}
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/**
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* Returns a fake MainThreadExecutor which executes immediately.
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*/
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@VisibleForTesting
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public static MainThread createFakeForTesting() {
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return new MainThread(null) {
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@Override
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public void execute(@Nonnull Runnable runnable) {
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//
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sIsMainThread.set(true);
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try {
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runnable.run();
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} finally {
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sIsMainThread.set(false);
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}
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}
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};
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}
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}
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