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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* 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.
*/
#pragma once
#include <hicn/transport/config.h>
#include <hicn/transport/core/asio_wrapper.h>
#include <hicn/transport/errors/runtime_exception.h>
#include <memory>
#include <thread>
namespace utils {
class EventThread {
public:
EventThread(asio::io_service& io_service, bool detached = false)
: internal_io_service_(nullptr),
io_service_(std::ref(io_service)),
work_(std::make_unique<asio::io_service::work>(io_service_)),
thread_(nullptr),
detached_(detached) {
run();
}
EventThread(bool detached = false)
: internal_io_service_(std::make_unique<asio::io_service>()),
io_service_(std::ref(*internal_io_service_)),
work_(std::make_unique<asio::io_service::work>(io_service_)),
thread_(nullptr),
detached_(detached) {
run();
}
EventThread(const EventThread&) = delete;
EventThread& operator=(const EventThread&) = delete;
EventThread(EventThread&& other)
: internal_io_service_(std::move(other.internal_io_service_)),
io_service_(std::move(other.io_service_)),
work_(std::move(other.work_)),
thread_(std::move(other.thread_)),
detached_(std::move(other.detached_)) {}
EventThread& operator=(EventThread&& other) {
internal_io_service_ = std::move(other.internal_io_service_);
io_service_ = std::move(other.io_service_);
work_ = std::move(other.work_);
thread_ = std::move(other.thread_);
detached_ = other.detached_;
return *this;
}
~EventThread() { stop(); }
void run() {
if (stopped()) {
io_service_.get().stopped();
}
thread_ =
std::make_unique<std::thread>([this]() { io_service_.get().run(); });
if (detached_) {
thread_->detach();
}
}
std::thread::id getThreadId() const {
if (thread_) {
return thread_->get_id();
} else {
throw errors::RuntimeException("Event thread is not running.");
}
}
template <typename Func>
void add(Func&& f) {
io_service_.get().post(std::forward<Func&&>(f));
}
template <typename Func>
void tryRunHandlerNow(Func&& f) {
io_service_.get().dispatch(std::forward<Func&&>(f));
}
template <typename Func>
void addAndWaitForExecution(Func&& f) {
auto promise = std::promise<void>();
auto future = promise.get_future();
asio::dispatch(io_service_.get(), [&promise, f = std::forward<Func>(f)]() {
f();
promise.set_value();
});
future.wait();
}
void stop() {
work_.reset();
if (thread_ && thread_->joinable()) {
thread_->join();
}
thread_.reset();
}
bool stopped() { return io_service_.get().stopped(); }
asio::io_service& getIoService() { return io_service_; }
private:
std::unique_ptr<asio::io_service> internal_io_service_;
std::reference_wrapper<asio::io_service> io_service_;
std::unique_ptr<asio::io_service::work> work_;
std::unique_ptr<std::thread> thread_;
bool detached_;
};
} // namespace utils
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