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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/db/exec/text_match.h"
#include <vector>
#include "mongo/db/exec/scoped_timer.h"
#include "mongo/db/exec/working_set.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/db/jsobj.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/stdx/memory.h"
namespace mongo {
using std::unique_ptr;
using std::vector;
using stdx::make_unique;
const char* TextMatchStage::kStageType = "TEXT_MATCH";
TextMatchStage::TextMatchStage(OperationContext* opCtx,
unique_ptr<PlanStage> child,
const FTSQuery& query,
const FTSSpec& spec,
WorkingSet* ws)
: PlanStage(kStageType, opCtx), _ftsMatcher(query, spec), _ws(ws) {
_children.emplace_back(std::move(child));
}
TextMatchStage::~TextMatchStage() {}
bool TextMatchStage::isEOF() {
return child()->isEOF();
}
std::unique_ptr<PlanStageStats> TextMatchStage::getStats() {
_commonStats.isEOF = isEOF();
unique_ptr<PlanStageStats> ret = make_unique<PlanStageStats>(_commonStats, STAGE_TEXT_MATCH);
ret->specific = make_unique<TextMatchStats>(_specificStats);
ret->children.push_back(child()->getStats().release());
return ret;
}
const SpecificStats* TextMatchStage::getSpecificStats() const {
return &_specificStats;
}
PlanStage::StageState TextMatchStage::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;
}
// Retrieve fetched document from child.
StageState stageState = child()->work(out);
if (stageState == PlanStage::ADVANCED) {
// We just successfully retrieved a fetched doc.
WorkingSetMember* wsm = _ws->get(*out);
// Filter for phrases and negated terms.
if (!_ftsMatcher.matches(wsm->obj.value())) {
_ws->free(*out);
*out = WorkingSet::INVALID_ID;
++_specificStats.docsRejected;
stageState = PlanStage::NEED_TIME;
}
} else if (stageState == PlanStage::FAILURE) {
// If a stage fails, it may create a status WSM to indicate why it
// failed, in which case '*out' is valid. If ID is invalid, we
// create our own error message.
if (WorkingSet::INVALID_ID == *out) {
str::stream ss;
ss << "TEXT_MATCH stage failed to read in results from child";
Status status(ErrorCodes::InternalError, ss);
*out = WorkingSetCommon::allocateStatusMember(_ws, status);
}
}
// Increment common stats counters that are specific to the return value of work().
switch (stageState) {
case PlanStage::ADVANCED:
++_commonStats.advanced;
break;
case PlanStage::NEED_TIME:
++_commonStats.needTime;
break;
case PlanStage::NEED_YIELD:
++_commonStats.needYield;
break;
default:
break;
}
return stageState;
}
} // namespace mongo
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