90 lines
2.3 KiB
C++
90 lines
2.3 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 <folly/executors/MeteredExecutor.h>
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#include <limits>
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#include <folly/io/async/AtomicNotificationQueue.h>
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namespace folly {
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MeteredExecutor::MeteredExecutor(KeepAlive keepAlive)
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: kaInner_(std::move(keepAlive)) {
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queue_.setMaxReadAtOnce(1);
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queue_.arm();
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}
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MeteredExecutor::MeteredExecutor(std::unique_ptr<Executor> executor)
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: MeteredExecutor(getKeepAliveToken(*executor)) {
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ownedExecutor_ = std::move(executor);
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}
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void MeteredExecutor::setMaxReadAtOnce(uint32_t maxAtOnce) {
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queue_.setMaxReadAtOnce(maxAtOnce);
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}
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void MeteredExecutor::add(Func func) {
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if (queue_.push(std::move(func))) {
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scheduleCallback();
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}
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}
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void MeteredExecutor::loopCallback() {
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Consumer consumer(*this);
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if (queue_.drive(consumer) || !queue_.arm()) {
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scheduleCallback();
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}
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consumer.executeIfNotEmpty();
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}
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void MeteredExecutor::scheduleCallback() {
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folly::RequestContextScopeGuard g{std::shared_ptr<RequestContext>()};
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kaInner_->add([self = getKeepAliveToken(this)] { self->loopCallback(); });
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}
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MeteredExecutor::~MeteredExecutor() {
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joinKeepAlive();
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}
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MeteredExecutor::Consumer::~Consumer() {
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DCHECK(!first_);
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}
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void MeteredExecutor::Consumer::executeIfNotEmpty() {
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if (first_) {
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RequestContextScopeGuard guard(std::move(firstRctx_));
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auto first = std::move(first_);
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first();
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}
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}
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void MeteredExecutor::Consumer::operator()(
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Func&& func, std::shared_ptr<RequestContext>&& rctx) {
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if (!first_) {
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first_ = std::move(func);
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firstRctx_ = std::move(rctx);
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} else {
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self_.kaInner_->add(
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[func = std::move(func), rctx = std::move(rctx)]() mutable {
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RequestContextScopeGuard guard(std::move(rctx));
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func();
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});
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}
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}
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} // namespace folly
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