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/**
* Copyright (C) 2023-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include <functional>
#include "mongo/executor/inline_executor.h"
#include "mongo/base/error_codes.h"
#include "mongo/transport/baton.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/time_support.h"
namespace mongo::executor {
namespace {
class Scheduler : public OutOfLineExecutor {
public:
explicit Scheduler(std::shared_ptr<InlineExecutor::State>& state) : _state(state) {}
~Scheduler() = default;
void schedule(OutOfLineExecutor::Task func) override {
if (auto state = _state.lock()) {
try {
state->tasks.push(std::move(func));
return;
} catch (const ExceptionFor<ErrorCodes::ProducerConsumerQueueEndClosed>&) {
// The corresponding `InlineExecutor` can no longer accept work.
}
}
func({ErrorCodes::ShutdownInProgress, "The instance of InlineExecutor is shutdown!"});
}
private:
std::weak_ptr<InlineExecutor::State> _state;
};
} // namespace
InlineExecutor::InlineExecutor()
: _state(std::make_shared<State>()), _executor(std::make_shared<Scheduler>(_state)) {}
InlineExecutor::~InlineExecutor() {
_state->tasks.closeProducerEnd();
ON_BLOCK_EXIT([&] { _state->tasks.closeConsumerEnd(); });
try {
while (auto maybeTask = _state->tasks.tryPop()) {
(*maybeTask)({ErrorCodes::ShutdownInProgress, "Stopping the inline executor"});
}
} catch (const ExceptionFor<ErrorCodes::ProducerConsumerQueueConsumed>&) {
// Nothing to do as this is the result of calling `tryPop` on an empty queue.
}
}
void InlineExecutor::run(Predicate predicate, Interruptible* interruptible) {
while (!predicate()) {
_state->tasks.pop(interruptible)(Status::OK());
}
}
namespace {
class SleepableExecutorImpl : public InlineExecutor::SleepableExecutor {
public:
using Sleeper = std::function<SemiFuture<void>(Milliseconds, const CancellationToken&)>;
SleepableExecutorImpl() = delete;
SleepableExecutorImpl(std::shared_ptr<OutOfLineExecutor> executor, Sleeper sleeper)
: _executor(std::move(executor)), _sleeper(std::move(sleeper)) {}
void schedule(OutOfLineExecutor::Task task) override {
_executor->schedule(std::move(task));
}
ExecutorFuture<void> sleepFor(Milliseconds duration, const CancellationToken& token) override {
return _sleeper(duration, token).thenRunOn(_executor);
}
private:
std::shared_ptr<OutOfLineExecutor> _executor;
Sleeper _sleeper;
};
} // namespace
std::shared_ptr<InlineExecutor::SleepableExecutor> InlineExecutor::getSleepableExecutor(
const std::shared_ptr<TaskExecutor>& executor, const std::shared_ptr<Baton>& baton) {
SleepableExecutorImpl::Sleeper sleeper;
if (baton && baton->networking()) {
sleeper = [baton](Milliseconds duration, const CancellationToken& token) {
return baton->networking()->waitUntil(Date_t::now() + duration, token).semi();
};
} else {
invariant(executor);
sleeper = [executor](Milliseconds duration, const CancellationToken& token) {
return executor->sleepFor(duration, token).semi();
};
}
return std::make_shared<SleepableExecutorImpl>(getExecutor(), std::move(sleeper));
}
} // namespace mongo::executor
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