75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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*/
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#include <glog/logging.h>
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namespace folly {
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namespace detail {
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template <typename Callback>
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class ExecutorWithPriorityImpl : public virtual Executor {
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public:
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static Executor::KeepAlive<ExecutorWithPriorityImpl<std::decay_t<Callback>>>
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create(Executor::KeepAlive<Executor> executor, Callback&& callback) {
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return makeKeepAlive(new ExecutorWithPriorityImpl<std::decay_t<Callback>>(
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executor, std::move(callback)));
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}
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ExecutorWithPriorityImpl(ExecutorWithPriorityImpl const&) = delete;
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ExecutorWithPriorityImpl& operator=(ExecutorWithPriorityImpl const&) = delete;
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ExecutorWithPriorityImpl(ExecutorWithPriorityImpl&&) = delete;
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ExecutorWithPriorityImpl& operator=(ExecutorWithPriorityImpl&&) = delete;
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void add(Func func) override {
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int8_t priority = callback_();
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executor_->addWithPriority(std::move(func), priority);
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}
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protected:
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bool keepAliveAcquire() override {
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auto keepAliveCounter =
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keepAliveCounter_.fetch_add(1, std::memory_order_relaxed);
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DCHECK(keepAliveCounter > 0);
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return true;
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}
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void keepAliveRelease() override {
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auto keepAliveCounter =
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keepAliveCounter_.fetch_sub(1, std::memory_order_acq_rel);
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DCHECK(keepAliveCounter > 0);
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if (keepAliveCounter == 1) {
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delete this;
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}
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}
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private:
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ExecutorWithPriorityImpl(
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Executor::KeepAlive<Executor> executor,
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Callback&& callback)
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: executor_(std::move(executor)), callback_(std::move(callback)) {}
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std::atomic<ssize_t> keepAliveCounter_{1};
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Executor::KeepAlive<Executor> executor_;
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Callback callback_;
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};
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} // namespace detail
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template <typename Callback>
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Executor::KeepAlive<> ExecutorWithPriority::createDynamic(
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Executor::KeepAlive<Executor> executor,
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Callback&& callback) {
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return detail::ExecutorWithPriorityImpl<std::decay_t<Callback>>::create(
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executor, std::move(callback));
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}
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} // namespace folly
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