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/**
* Copyright (C) 2013 10gen 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/db/exec/queued_data_stage.h"
#include "mongo/db/exec/scoped_timer.h"
#include "mongo/db/exec/working_set_common.h"
namespace mongo {
using std::auto_ptr;
using std::vector;
const char* QueuedDataStage::kStageType = "QUEUED_DATA";
QueuedDataStage::QueuedDataStage(WorkingSet* ws)
: _ws(ws),
_commonStats(kStageType)
{}
PlanStage::StageState QueuedDataStage::work(WorkingSetID* out) {
++_commonStats.works;
// Adds the amount of time taken by work() to executionTimeMillis.
ScopedTimer timer(&_commonStats.executionTimeMillis);
if (isEOF()) { return PlanStage::IS_EOF; }
StageState state = _results.front();
_results.pop();
if (PlanStage::ADVANCED == state) {
++_commonStats.advanced;
*out = _members.front();
_members.pop();
}
else if (PlanStage::NEED_TIME == state) {
++_commonStats.needTime;
}
return state;
}
bool QueuedDataStage::isEOF() { return _results.empty(); }
void QueuedDataStage::saveState() {
++_commonStats.yields;
}
void QueuedDataStage::restoreState(OperationContext* opCtx) {
++_commonStats.unyields;
}
void QueuedDataStage::invalidate(OperationContext* txn,
const RecordId& dl,
InvalidationType type) {
++_commonStats.invalidates;
}
PlanStageStats* QueuedDataStage::getStats() {
_commonStats.isEOF = isEOF();
auto_ptr<PlanStageStats> ret(new PlanStageStats(_commonStats, STAGE_QUEUED_DATA));
ret->specific.reset(new MockStats(_specificStats));
return ret.release();
}
const CommonStats* QueuedDataStage::getCommonStats() { return &_commonStats; }
const SpecificStats* QueuedDataStage::getSpecificStats() { return &_specificStats; }
void QueuedDataStage::pushBack(const PlanStage::StageState state) {
invariant(PlanStage::ADVANCED != state);
_results.push(state);
}
void QueuedDataStage::pushBack(const WorkingSetMember& member) {
_results.push(PlanStage::ADVANCED);
WorkingSetID id = _ws->allocate();
WorkingSetMember* ourMember = _ws->get(id);
WorkingSetCommon::initFrom(ourMember, member);
// member lives in _ws. We'll return it when _results hits ADVANCED.
_members.push(id);
}
vector<PlanStage*> QueuedDataStage::getChildren() const {
vector<PlanStage*> empty;
return empty;
}
} // namespace mongo
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