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/**
* Copyright (C) 2020-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 "mongo/executor/async_request_executor.h"
#include "mongo/db/client_strand.h"
#include "mongo/db/operation_context.h"
#include "mongo/logv2/log.h"
#include "mongo/platform/compiler.h"
#include "mongo/util/fail_point.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kExecutor
namespace mongo {
MONGO_FAIL_POINT_DEFINE(hangBeforeRunningAsyncRequestExecutorTask);
AsyncRequestExecutor::AsyncRequestExecutor(std::string name) : _name(std::move(name)) {
ThreadPool::Options options;
options.minThreads = 0;
options.maxThreads = 1;
_pool = std::make_unique<ThreadPool>(std::move(options));
}
void AsyncRequestExecutor::start() {
_pool->startup();
LOGV2_DEBUG(
4910801, kDiagnosticLogLevel, "Started asynchronous request executor", "name"_attr = _name);
}
void AsyncRequestExecutor::stop() {
_pool->shutdown();
_pool->join();
LOGV2_DEBUG(
4910802, kDiagnosticLogLevel, "Stopped asynchronous request executor", "name"_attr = _name);
}
Future<void> AsyncRequestExecutor::schedule(std::shared_ptr<RequestExecutionContext> rec) {
auto opCtx = rec->getOpCtx();
auto [promise, future] = makePromiseFuture<void>();
// `this` remains valid as it owns the instance of thread pool.
_pool->schedule([this,
strand = ClientStrand::get(opCtx->getClient()),
promise = std::move(promise),
rec = std::move(rec)](Status status) mutable {
hangBeforeRunningAsyncRequestExecutorTask.pauseWhileSet();
strand->run([&] {
promise.setWith([&] {
if (MONGO_unlikely(!status.isOK()))
return status.withContext("Unable to schedule asynchronous request");
auto opCtx = rec->getOpCtx();
if (opCtx->isKillPending())
return Status(opCtx->getKillStatus(), "Asynchronous operation was interrupted");
return handleRequest(std::move(rec));
});
});
});
return std::move(future);
}
} // namespace mongo
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