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/**
* Copyright (C) 2013 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/db/commands.h"
#include "mongo/db/query/plan_cache.h"
namespace mongo {
/**
* DB commands for plan cache.
* These are in a header to facilitate unit testing. See plan_cache_commands_test.cpp.
*/
/**
* PlanCacheCommand
* Defines common attributes for all plan cache related commands
* such as slaveOk.
*/
class PlanCacheCommand : public BasicCommand {
public:
PlanCacheCommand(const std::string& name, const std::string& helpText, ActionType actionType);
/**
* Entry point from command subsystem.
* Implementation provides standardization of error handling
* such as adding error code and message to BSON result.
*
* Do not override in derived classes.
* Override runPlanCacheCommands instead to
* implement plan cache command functionality.
*/
bool run(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder& result);
virtual bool supportsWriteConcern(const BSONObj& cmd) const override;
virtual bool slaveOk() const;
virtual bool slaveOverrideOk() const;
virtual void help(std::stringstream& ss) const;
/**
* Two action types defined for plan cache commands:
* - planCacheRead
* - planCacheWrite
*/
virtual Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj);
/**
* Subset of command arguments used by plan cache commands
* Override to provide command functionality.
* Should contain just enough logic to invoke run*Command() function
* in plan_cache.h
*/
virtual Status runPlanCacheCommand(OperationContext* opCtx,
const std::string& ns,
const BSONObj& cmdObj,
BSONObjBuilder* bob) = 0;
/**
* Validatess query shape from command object and returns canonical query.
*/
static StatusWith<std::unique_ptr<CanonicalQuery>> canonicalize(OperationContext* opCtx,
const std::string& ns,
const BSONObj& cmdObj);
private:
std::string helpText;
ActionType actionType;
};
/**
* planCacheListQueryShapes
*
* { planCacheListQueryShapes: <collection> }
*
*/
class PlanCacheListQueryShapes : public PlanCacheCommand {
public:
PlanCacheListQueryShapes();
virtual Status runPlanCacheCommand(OperationContext* opCtx,
const std::string& ns,
const BSONObj& cmdObj,
BSONObjBuilder* bob);
/**
* Looks up cache keys for collection's plan cache.
* Inserts keys for query into BSON builder.
*/
static Status list(const PlanCache& planCache, BSONObjBuilder* bob);
};
/**
* planCacheClear
*
* {
* planCacheClear: <collection>,
* query: <query>,
* sort: <sort>,
* projection: <projection>
* }
*
*/
class PlanCacheClear : public PlanCacheCommand {
public:
PlanCacheClear();
virtual Status runPlanCacheCommand(OperationContext* opCtx,
const std::string& ns,
const BSONObj& cmdObj,
BSONObjBuilder* bob);
/**
* Clears collection's plan cache.
* If query shape is provided, clears plans for that single query shape only.
*/
static Status clear(OperationContext* opCtx,
PlanCache* planCache,
const std::string& ns,
const BSONObj& cmdObj);
};
/**
* planCacheListPlans
*
* {
* planCacheListPlans: <collection>,
* query: <query>,
* sort: <sort>,
* projection: <projection>
* }
*
*/
class PlanCacheListPlans : public PlanCacheCommand {
public:
PlanCacheListPlans();
virtual Status runPlanCacheCommand(OperationContext* opCtx,
const std::string& ns,
const BSONObj& cmdObj,
BSONObjBuilder* bob);
/**
* Displays the cached plans for a query shape.
*/
static Status list(OperationContext* opCtx,
const PlanCache& planCache,
const std::string& ns,
const BSONObj& cmdObj,
BSONObjBuilder* bob);
};
} // namespace mongo
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