/* Copyright 2017 Google Inc.
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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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* 2019.12.15-Changed method releaseExecutor
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* Huawei Technologies Co., Ltd.
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*
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*/
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package com.huawei.push.messaging;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ThreadFactory;
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/** Default ThreadManager implementations used by the HCM SDK */
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public class HuaweiThreadManager {
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public static final ThreadManager DEFAULT_THREAD_MANAGER = new DefaultThreadManager();
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/**
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* An abstract ThreadManager implementation that uses the same executor service
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* across all active apps. The executor service is initialized when the first app is initialized,
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* and terminated when the last app is deleted. This class is thread safe.
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*/
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abstract static class GlobalThreadManager extends ThreadManager {
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private final Object lock = new Object();
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private final Set<String> apps = new HashSet<>();
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private ExecutorService executorService;
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@Override
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protected ExecutorService getExecutor(HuaweiApp app) {
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synchronized (lock) {
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if (executorService == null) {
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executorService = doInit();
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}
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apps.add(app.getOption().getCredential().getAppId());
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return executorService;
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}
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}
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@Override
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protected void releaseExecutor(HuaweiApp app, ExecutorService executor) {
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synchronized (lock) {
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String appId = app.getOption().getCredential().getAppId();
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if (apps.remove(appId) && apps.isEmpty()) {
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doCleanup(executorService);
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executorService = null;
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}
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}
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}
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/**
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* Initializes the executor service. Called when the first application is initialized.
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*/
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protected abstract ExecutorService doInit();
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/**
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* Cleans up the executor service. Called when the last application is deleted.
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*/
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protected abstract void doCleanup(ExecutorService executorService);
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}
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private static class DefaultThreadManager extends GlobalThreadManager {
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@Override
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protected ExecutorService doInit() {
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ThreadFactory threadFactory = HuaweiScheduledExecutor.getThreadFactoryWithName(getThreadFactory(), "huawei-default-%d");
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return Executors.newCachedThreadPool(threadFactory);
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}
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@Override
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protected void doCleanup(ExecutorService executorService) {
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executorService.shutdown();
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}
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@Override
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protected ThreadFactory getThreadFactory() {
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return Executors.defaultThreadFactory();
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}
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}
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}
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