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/**
* Copyright (C) 2022-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.
*/
#pragma once
#include "mongo/platform/basic.h"
#include "mongo/db/repl/primary_only_service_util.h"
#include "mongo/db/set_change_stream_state_coordinator_gen.h"
namespace mongo {
/**
* A 'PrimaryOnlyService::Instance' that runs in the replica sets and orchestrates the change stream
* requests in the serverless.
*
* At any time only one request is accepted, any subsequent request will be rejected by this
* instance type.
*/
class SetChangeStreamStateCoordinator : public DefaultPrimaryOnlyServiceInstance {
public:
explicit SetChangeStreamStateCoordinator(const BSONObj& stateDoc);
StringData getInstanceName() final;
boost::optional<BSONObj> reportForCurrentOp(
MongoProcessInterface::CurrentOpConnectionsMode connMode,
MongoProcessInterface::CurrentOpSessionsMode sessionMode) noexcept final;
void checkIfOptionsConflict(const BSONObj& stateDoc) const final;
private:
ExecutorFuture<void> _runImpl(std::shared_ptr<executor::ScopedTaskExecutor> executor,
const CancellationToken& token) noexcept;
void _removeStateDocument(OperationContext* opCtx) final;
// The state document of the 'PrimaryOnlyService'.
SetChangeStreamStateCoordinatorDocument _stateDoc;
// Stores the state document durably in the namespace 'config.change_stream_coordinator'.
PrimaryOnlyServiceStateStore<SetChangeStreamStateCoordinatorDocument> _stateDocStore;
};
/**
* A 'PrimaryOnlyService' that creates and gets an instance of the
* 'SetChangeStreamStateCoordinator'.
*/
class SetChangeStreamStateCoordinatorService final : public repl::PrimaryOnlyService {
public:
explicit SetChangeStreamStateCoordinatorService(ServiceContext* serviceContext)
: repl::PrimaryOnlyService(serviceContext) {}
~SetChangeStreamStateCoordinatorService() = default;
StringData getServiceName() const final;
NamespaceString getStateDocumentsNS() const final;
ThreadPool::Limits getThreadPoolLimits() const final;
std::shared_ptr<SetChangeStreamStateCoordinator> getOrCreateInstance(OperationContext* opCtx,
BSONObj coorDoc);
static SetChangeStreamStateCoordinatorService* getService(OperationContext* opCtx);
void checkIfConflictsWithOtherInstances(
OperationContext* opCtx,
BSONObj initialState,
const std::vector<const PrimaryOnlyService::Instance*>& existingInstances) final{};
std::shared_ptr<repl::PrimaryOnlyService::Instance> constructInstance(
BSONObj initialState) final;
};
} // namespace mongo
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