84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
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/*
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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/TimekeeperScheduledExecutor.h>
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#include <folly/futures/Future.h>
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namespace folly {
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/* static */ Executor::KeepAlive<TimekeeperScheduledExecutor>
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TimekeeperScheduledExecutor::create(
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Executor::KeepAlive<> parent,
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Function<std::shared_ptr<Timekeeper>()> getTimekeeper) {
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return makeKeepAlive<TimekeeperScheduledExecutor>(
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new TimekeeperScheduledExecutor(
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std::move(parent), std::move(getTimekeeper)));
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}
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void TimekeeperScheduledExecutor::run(Func func) {
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try {
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func();
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} catch (std::exception const& ex) {
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LOG(ERROR) << "func threw unhandled exception " << folly::exceptionStr(ex);
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} catch (...) {
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LOG(ERROR) << "func threw unhandled non-exception object";
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}
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}
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void TimekeeperScheduledExecutor::add(Func func) {
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parent_->add(
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[keepAlive = getKeepAliveToken(this), f = std::move(func)]() mutable {
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keepAlive->run(std::move(f));
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});
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}
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void TimekeeperScheduledExecutor::scheduleAt(
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Func&& func,
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ScheduledExecutor::TimePoint const& t) {
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auto delay = std::chrono::duration_cast<folly::Duration>(
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t - std::chrono::steady_clock::now());
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if (delay.count() > 0) {
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auto tk = getTimekeeper_();
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if (UNLIKELY(!tk)) {
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throw TimekeeperScheduledExecutorNoTimekeeper();
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}
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tk->after(delay)
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.via(parent_.copy())
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.thenValue([keepAlive = getKeepAliveToken(this), f = std::move(func)](
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auto&&) mutable { keepAlive->run(std::move(f)); });
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} else {
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add(std::move(func));
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}
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}
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bool TimekeeperScheduledExecutor::keepAliveAcquire() {
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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 TimekeeperScheduledExecutor::keepAliveRelease() {
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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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} // namespace folly
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