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/**
* Copyright (C) 2015 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/client/query_fetcher.h"
namespace mongo {
QueryFetcher::QueryFetcher(executor::TaskExecutor* exec,
const HostAndPort& src,
const NamespaceString& nss,
const BSONObj& cmdBSON,
const CallbackFn& work)
: _exec(exec),
_fetcher(exec,
src,
nss.db().toString(),
cmdBSON,
stdx::bind(&QueryFetcher::_onFetchCallback,
this,
stdx::placeholders::_1,
stdx::placeholders::_2,
stdx::placeholders::_3)),
_responses(0),
_work(work) {
}
int QueryFetcher::_getResponses() const {
return _responses;
}
void QueryFetcher::_onFetchCallback(const Fetcher::QueryResponseStatus& fetchResult,
Fetcher::NextAction* nextAction,
BSONObjBuilder* getMoreBob) {
_delegateCallback(fetchResult, nextAction);
++_responses;
// The fetcher will continue to call with kGetMore until an error or the last batch.
if (fetchResult.isOK() && *nextAction == Fetcher::NextAction::kGetMore) {
const auto batchData(fetchResult.getValue());
invariant(getMoreBob);
getMoreBob->append("getMore", batchData.cursorId);
getMoreBob->append("collection", batchData.nss.coll());
}
}
void QueryFetcher::_onQueryResponse(const Fetcher::QueryResponseStatus& fetchResult,
Fetcher::NextAction* nextAction) {
_work(fetchResult, nextAction);
}
void QueryFetcher::_delegateCallback(const Fetcher::QueryResponseStatus& fetchResult,
Fetcher::NextAction* nextAction) {
_onQueryResponse(fetchResult, nextAction);
};
std::string QueryFetcher::getDiagnosticString() const {
return str::stream() << "QueryFetcher -"
<< " responses: " << _responses
<< " fetcher: " << _fetcher.getDiagnosticString();
}
} // namespace mongo
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