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/**
* Copyright (C) 2019-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/base/status.h"
namespace mongo {
/**
* The result of checking a thing's readConcern support. There are two parts:
* - Whether or not the thing supports the given readConcern.
* - Whether or not the thing permits having the default readConcern applied.
*
* The thing is a command invocation, an aggregation pipeline, or an aggregation stage.
*/
struct ReadConcernSupportResult {
/**
* Convenience method to explicitly return a ReadConcernSupportResult which both supports the
* given read concern and permits the default cluster-wide read concern to be applied.
*/
static ReadConcernSupportResult allSupportedAndDefaultPermitted() {
return {Status::OK(), Status::OK(), Status::OK()};
}
/**
* Whether this thing supports the requested readConcern level (and if not, why not).
*/
Status readConcernSupport;
/**
* Whether this thing permits the default readConcern to be applied (and if not, why not).
*/
Status defaultReadConcernPermit;
/*
* Whether this permits the implicit default readConcern to be applied (and if not, why not).
*/
Status implicitDefaultReadConcernPermit;
/**
* Construct with the given Statuses, or default to Status::OK if omitted.
*/
ReadConcernSupportResult(boost::optional<Status> readConcernStatus,
boost::optional<Status> defaultReadConcernStatus)
: readConcernSupport(readConcernStatus.value_or(Status::OK())),
defaultReadConcernPermit(defaultReadConcernStatus.value_or(Status::OK())),
implicitDefaultReadConcernPermit(Status::OK()) {}
/**
* Construct with the given Statuses, or default to Status::OK if omitted.
*/
ReadConcernSupportResult(boost::optional<Status> readConcernStatus,
boost::optional<Status> defaultReadConcernStatus,
boost::optional<Status> implicitDefaultReadConcernStatus)
: readConcernSupport(readConcernStatus.value_or(Status::OK())),
defaultReadConcernPermit(defaultReadConcernStatus.value_or(Status::OK())),
implicitDefaultReadConcernPermit(
implicitDefaultReadConcernStatus.value_or(Status::OK())) {}
/**
* Combine the contents of another ReadConcernSupportResult with this one. The outcome is that,
* for each of supported and permitted, this ReadConcernSupportResult will be non-OK if either
* it or the other one is non-OK. If both are non-OK then preference is given to this one's
* Status.
*/
void merge(const ReadConcernSupportResult& other) {
if (readConcernSupport.isOK()) {
readConcernSupport = other.readConcernSupport;
}
if (defaultReadConcernPermit.isOK()) {
defaultReadConcernPermit = other.defaultReadConcernPermit;
}
}
};
} // namespace mongo
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