/* 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 getHuaweiExecutors
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* 2019.12.15-changed method releaseHuaweiExecutors
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* 2019.12.15-changed method getExecutor
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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 com.huawei.push.util.ValidatorUtils;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.ThreadFactory;
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/**
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* An interface that controls the thread pools and thread factories used by the HCM SDK. Each
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* instance of HuaweiApp uses an implementation of this interface to create and manage
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* threads.
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*/
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public abstract class ThreadManager {
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final HuaweiExecutors getHuaweiExecutors(HuaweiApp app) {
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return new HuaweiExecutors(getExecutor(app));
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}
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final void releaseHuaweiExecutors(HuaweiApp app, HuaweiExecutors executor) {
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releaseExecutor(app, executor.userExecutor);
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}
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/**
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* Returns the main thread pool for an app.
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*
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* @param app A {@link HuaweiApp} instance.
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* @return A non-null <code>ExecutorService</code> instance.
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*/
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protected abstract ExecutorService getExecutor(HuaweiApp app);
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/**
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* Cleans up the thread pool associated with an app.
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* This method is invoked when an app is deleted.
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*
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* @param app A {@link HuaweiApp} instance.
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* @return A non-null <code>ExecutorService</code> instance.
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*/
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protected abstract void releaseExecutor(HuaweiApp app, ExecutorService executor);
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/**
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* Returns the <code>ThreadFactory</code> to be used for creating long-lived threads. This is
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* used mainly to create the long-lived worker threads for the scheduled (periodic) tasks started by the SDK.
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* The SDK guarantees clean termination of all threads started via this <code>ThreadFactory</code>, when the user
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* calls {@link HuaweiApp#delete()}.
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*
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* <p>If long-lived threads cannot be supported in the current runtime, this method may
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* throw a {@code RuntimeException}.
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*
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* @return A non-null <code>ThreadFactory</code>.
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*/
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protected abstract ThreadFactory getThreadFactory();
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static final class HuaweiExecutors {
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private ExecutorService userExecutor;
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private HuaweiExecutors(ExecutorService userExecutor) {
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ValidatorUtils.checkArgument(userExecutor != null, "ExecutorService must not be null");
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this.userExecutor = userExecutor;
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}
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}
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}
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