97 lines
2.3 KiB
C++
97 lines
2.3 KiB
C++
/*
|
|
* AsyncTaskThread.h
|
|
*
|
|
* This source file is part of the FoundationDB open source project
|
|
*
|
|
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
|
|
*
|
|
* 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 __ASYNC_TASK_THREAD_H__
|
|
#define __ASYNC_TASK_THREAD_H__
|
|
|
|
#include <future>
|
|
#include <thread>
|
|
#include <memory>
|
|
|
|
#include "flow/network.h"
|
|
#include "flow/ThreadHelper.actor.h"
|
|
#include "flow/ThreadSafeQueue.h"
|
|
|
|
class IAsyncTask {
|
|
public:
|
|
virtual void operator()() = 0;
|
|
virtual ~IAsyncTask() = default;
|
|
};
|
|
|
|
template <class F>
|
|
class AsyncTask : public IAsyncTask {
|
|
F func;
|
|
|
|
public:
|
|
AsyncTask(const F& func) : func(func) {}
|
|
|
|
void operator()() override { func(); }
|
|
};
|
|
|
|
class AsyncTaskThread {
|
|
ThreadSafeQueue<std::shared_ptr<IAsyncTask>> queue;
|
|
std::promise<void> wakeUp;
|
|
std::thread thread;
|
|
|
|
static void run(AsyncTaskThread* conn) {
|
|
while (true) {
|
|
std::shared_ptr<IAsyncTask> task;
|
|
{
|
|
if (conn->queue.canSleep()) {
|
|
conn->wakeUp.get_future().get();
|
|
conn->wakeUp = {};
|
|
}
|
|
task = conn->queue.pop().get();
|
|
}
|
|
}
|
|
}
|
|
|
|
template <class F>
|
|
void addTask(const F& func) {
|
|
if (queue.push(std::make_shared<AsyncTask<F>>(func))) {
|
|
wakeUp.set_value();
|
|
}
|
|
}
|
|
|
|
public:
|
|
AsyncTaskThread() : thread([this] { run(this); }) {}
|
|
|
|
template <class F>
|
|
auto execAsync(const F& func, TaskPriority priority = TaskPriority::DefaultOnMainThread)
|
|
-> Future<decltype(func())> {
|
|
if (g_network->isSimulated()) {
|
|
// TODO: Add some random delay
|
|
return func();
|
|
}
|
|
Promise<decltype(func())> promise;
|
|
addTask([&promise, &func, priority] {
|
|
try {
|
|
auto funcResult = func();
|
|
onMainThreadVoid([&promise, &funcResult] { promise.send(funcResult); }, nullptr, priority);
|
|
} catch (Error& e) {
|
|
onMainThreadVoid([&promise, &e] { promise.sendError(e); }, nullptr, priority);
|
|
}
|
|
});
|
|
return promise.getFuture();
|
|
}
|
|
};
|
|
|
|
#endif
|