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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FRAMEWORK_NATIVE_CMD_TASKQUEUE_H_
#define FRAMEWORK_NATIVE_CMD_TASKQUEUE_H_
#include <mutex>
#include <queue>
#include <android-base/macros.h>
namespace android {
namespace os {
namespace dumpstate {
/*
* A task queue for dumpstate to collect tasks such as adding file to the zip
* which are needed to run in a single thread. The task is a callable function
* included a cancel task boolean parameter. The TaskQueue could
* cancel the task in the destructor if the task has never been called.
*/
class TaskQueue {
public:
TaskQueue() = default;
~TaskQueue();
/*
* Adds a task into the queue.
*
* |f| Callable function to execute the task. The function must include a
* boolean parameter for TaskQueue to notify whether the task is
* cancelled or not.
* |args| A list of arguments.
*/
template<class F, class... Args> void add(F&& f, Args&&... args) {
auto func = std::bind(std::forward<F>(f), std::forward<Args>(args)...);
std::unique_lock lock(lock_);
tasks_.emplace([=](bool cancelled) {
std::invoke(func, cancelled);
});
}
/*
* Invokes all tasks in the task queue.
*
* |do_cancel| true to cancel all tasks in the queue.
*/
void run(bool do_cancel);
private:
using Task = std::function<void(bool)>;
std::mutex lock_;
std::queue<Task> tasks_;
DISALLOW_COPY_AND_ASSIGN(TaskQueue);
};
} // namespace dumpstate
} // namespace os
} // namespace android
#endif //FRAMEWORK_NATIVE_CMD_TASKQUEUE_H_
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