78 lines
2.1 KiB
Java
78 lines
2.1 KiB
Java
/*
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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.download;
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import android.os.Handler;
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import android.os.Looper;
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import java.util.concurrent.Executor;
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import java.util.concurrent.Executors;
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/**
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* Global executor pools for the whole application.
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* <p>
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* Grouping tasks like this avoids the effects of task starvation (e.g. disk reads don't wait behind
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* webservice requests).
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*/
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public class AppExecutors {
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private static AppExecutors appExecutors;
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private final Executor diskIO;
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private final Executor networkIO;
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private final Executor mainThread;
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private AppExecutors(Executor diskIO, Executor networkIO, Executor mainThread) {
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this.diskIO = diskIO;
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this.networkIO = networkIO;
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this.mainThread = mainThread;
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}
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private AppExecutors() {
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this(Executors.newSingleThreadExecutor(), Executors.newFixedThreadPool(3),
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new MainThreadExecutor());
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}
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public static AppExecutors getAppExecutors() {
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if (appExecutors == null)
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return new AppExecutors();
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else
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return appExecutors;
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}
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public Executor diskIO() {
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return diskIO;
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}
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public Executor networkIO() {
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return networkIO;
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}
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public Executor mainThread() {
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return mainThread;
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}
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private static class MainThreadExecutor implements Executor {
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private Handler mainThreadHandler = new Handler(Looper.getMainLooper());
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@Override
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public void execute(Runnable command) {
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mainThreadHandler.post(command);
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}
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}
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}
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