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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 <map>
#include <string>
#include "mongo/base/disallow_copying.h"
#include "mongo/bson/timestamp.h"
#include "mongo/s/ns_targeter.h"
#include "mongo/s/shard_resolver.h"
#include "mongo/s/write_ops/batched_command_request.h"
#include "mongo/s/write_ops/batched_command_response.h"
namespace mongo {
class BatchWriteExecStats;
class MultiCommandDispatch;
/**
* The BatchWriteExec is able to execute client batch write requests, resulting in a batch
* response to send back to the client.
*
* There are two main interfaces the exec uses to "run" the batch:
*
* - the "targeter" used to generate child batch operations to send to particular shards
*
* - the "dispatcher" used to send child batches to several shards at once, and retrieve the
* results
*
* Both the targeter and dispatcher are assumed to be dedicated to this particular
* BatchWriteExec instance.
*
*/
class BatchWriteExec {
MONGO_DISALLOW_COPYING (BatchWriteExec);
public:
BatchWriteExec( NSTargeter* targeter,
ShardResolver* resolver,
MultiCommandDispatch* dispatcher );
/**
* Executes a client batch write request by sending child batches to several shard
* endpoints, and returns a client batch write response.
*
* This function does not throw, any errors are reported via the clientResponse.
*/
void executeBatch( const BatchedCommandRequest& clientRequest,
BatchedCommandResponse* clientResponse );
const BatchWriteExecStats& getStats();
BatchWriteExecStats* releaseStats();
private:
// Not owned here
NSTargeter* _targeter;
// Not owned here
ShardResolver* _resolver;
// Not owned here
MultiCommandDispatch* _dispatcher;
// Stats
std::unique_ptr<BatchWriteExecStats> _stats;
};
struct HostOpTime {
HostOpTime(Timestamp ot, OID e) : opTime(ot), electionId(e) {};
HostOpTime() {};
Timestamp opTime;
OID electionId;
};
typedef std::map<ConnectionString, HostOpTime> HostOpTimeMap;
class BatchWriteExecStats {
public:
BatchWriteExecStats() :
numRounds( 0 ), numTargetErrors( 0 ), numResolveErrors( 0 ), numStaleBatches( 0 ) {
}
void noteWriteAt(const ConnectionString& host, Timestamp opTime, const OID& electionId);
const HostOpTimeMap& getWriteOpTimes() const;
// Expose via helpers if this gets more complex
// Number of round trips required for the batch
int numRounds;
// Number of times targeting failed
int numTargetErrors;
// Number of times host resolution failed
int numResolveErrors;
// Number of stale batches
int numStaleBatches;
private:
HostOpTimeMap _writeOpTimes;
};
}
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