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/**
* Copyright (C) 2014 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.
*/
/**
* This file tests near search functionality.
*/
#include <boost/shared_ptr.hpp>
#include "mongo/base/owned_pointer_vector.h"
#include "mongo/db/exec/near.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/unittest/unittest.h"
namespace {
using namespace mongo;
using boost::shared_ptr;
using std::vector;
/**
* Stage which takes in an array of BSONObjs and returns them.
* If the BSONObj is in the form of a Status, returns the Status as a FAILURE.
*/
class MockStage : public PlanStage {
public:
MockStage(const vector<BSONObj>& data, WorkingSet* workingSet) :
_data(data), _pos(0), _workingSet(workingSet), _stats("MOCK_STAGE") {
}
virtual ~MockStage() {
}
virtual StageState work(WorkingSetID* out) {
++_stats.works;
if (isEOF())
return PlanStage::IS_EOF;
BSONObj next = _data[_pos++];
if (WorkingSetCommon::isValidStatusMemberObject(next)) {
Status status = WorkingSetCommon::getMemberObjectStatus(next);
*out = WorkingSetCommon::allocateStatusMember(_workingSet, status);
return PlanStage::FAILURE;
}
*out = _workingSet->allocate();
WorkingSetMember* member = _workingSet->get(*out);
member->state = WorkingSetMember::OWNED_OBJ;
member->obj = next;
return PlanStage::ADVANCED;
}
virtual bool isEOF() {
return _pos == static_cast<int>(_data.size());
}
virtual void saveState() {
}
virtual void restoreState(OperationContext* opCtx) {
}
virtual void invalidate(OperationContext* txn, const RecordId& dl, InvalidationType type) {
}
virtual vector<PlanStage*> getChildren() const {
return vector<PlanStage*>();
}
virtual StageType stageType() const {
return STAGE_UNKNOWN;
}
virtual PlanStageStats* getStats() {
return new PlanStageStats(_stats, STAGE_UNKNOWN);
}
virtual const CommonStats* getCommonStats() {
return &_stats;
}
virtual const SpecificStats* getSpecificStats() {
return NULL;
}
private:
vector<BSONObj> _data;
int _pos;
// Not owned here
WorkingSet* const _workingSet;
CommonStats _stats;
};
/**
* Stage which implements a basic distance search, and interprets the "distance" field of
* fetched documents as the distance.
*/
class MockNearStage : public NearStage {
public:
struct MockInterval {
MockInterval(const vector<BSONObj>& data, double min, double max) :
data(data), min(min), max(max) {
}
vector<BSONObj> data;
double min;
double max;
};
MockNearStage(WorkingSet* workingSet) :
NearStage(NULL, workingSet, NULL,
new PlanStageStats(CommonStats("MOCK_DISTANCE_SEARCH_STAGE"), STAGE_UNKNOWN)),
_pos(0) {
}
virtual ~MockNearStage() {
}
void addInterval(vector<BSONObj> data, double min, double max) {
_intervals.mutableVector().push_back(new MockInterval(data, min, max));
}
virtual StatusWith<CoveredInterval*> nextInterval(OperationContext* txn,
WorkingSet* workingSet,
Collection* collection) {
if (_pos == static_cast<int>(_intervals.size()))
return StatusWith<CoveredInterval*>(NULL);
const MockInterval& interval = *_intervals.vector()[_pos++];
bool lastInterval = _pos == static_cast<int>(_intervals.vector().size());
return StatusWith<CoveredInterval*>(new CoveredInterval(new MockStage(interval.data,
workingSet),
true,
interval.min,
interval.max,
lastInterval));
}
virtual StatusWith<double> computeDistance(WorkingSetMember* member) {
ASSERT(member->hasObj());
return StatusWith<double>(member->obj["distance"].numberDouble());
}
private:
OwnedPointerVector<MockInterval> _intervals;
int _pos;
};
static vector<BSONObj> advanceStage(PlanStage* stage, WorkingSet* workingSet) {
vector<BSONObj> results;
WorkingSetID nextMemberID;
PlanStage::StageState state = PlanStage::NEED_TIME;
while (PlanStage::NEED_TIME == state) {
while (PlanStage::ADVANCED == (state = stage->work(&nextMemberID))) {
results.push_back(workingSet->get(nextMemberID)->obj);
}
}
return results;
}
static void assertAscendingAndValid(const vector<BSONObj>& results) {
double lastDistance = -1.0;
for (vector<BSONObj>::const_iterator it = results.begin(); it != results.end(); ++it) {
double distance = (*it)["distance"].numberDouble();
bool shouldInclude = (*it)["$included"].eoo() || (*it)["$included"].trueValue();
ASSERT(shouldInclude);
ASSERT_GREATER_THAN_OR_EQUALS(distance, lastDistance);
lastDistance = distance;
}
}
TEST(query_stage_near, Basic) {
vector<BSONObj> mockData;
WorkingSet workingSet;
MockNearStage nearStage(&workingSet);
// First set of results
mockData.clear();
mockData.push_back(BSON("distance" << 0.5));
mockData.push_back(BSON("distance" << 2.0 << "$included" << false)); // Not included
mockData.push_back(BSON("distance" << 0.0));
nearStage.addInterval(mockData, 0.0, 1.0);
// Second set of results
mockData.clear();
mockData.push_back(BSON("distance" << 1.5));
mockData.push_back(BSON("distance" << 2.0 << "$included" << false)); // Not included
mockData.push_back(BSON("distance" << 1.0));
nearStage.addInterval(mockData, 1.0, 2.0);
// Last set of results
mockData.clear();
mockData.push_back(BSON("distance" << 2.5));
mockData.push_back(BSON("distance" << 3.0)); // Included
mockData.push_back(BSON("distance" << 2.0));
nearStage.addInterval(mockData, 2.0, 3.0);
vector<BSONObj> results = advanceStage(&nearStage, &workingSet);
ASSERT_EQUALS(results.size(), 7u);
assertAscendingAndValid(results);
}
TEST(query_stage_near, EmptyResults) {
vector<BSONObj> mockData;
WorkingSet workingSet;
MockNearStage nearStage(&workingSet);
// Empty set of results
mockData.clear();
nearStage.addInterval(mockData, 0.0, 1.0);
// Non-empty sest of results
mockData.clear();
mockData.push_back(BSON("distance" << 1.5));
mockData.push_back(BSON("distance" << 2.0));
mockData.push_back(BSON("distance" << 1.0));
nearStage.addInterval(mockData, 1.0, 2.0);
vector<BSONObj> results = advanceStage(&nearStage, &workingSet);
ASSERT_EQUALS(results.size(), 3u);
assertAscendingAndValid(results);
}
}
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