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/**
* Copyright (C) 2014 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/db/exec/pipeline_proxy.h"
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/expression_context.h"
namespace mongo {
using boost::intrusive_ptr;
using std::shared_ptr;
using std::vector;
const char* PipelineProxyStage::kStageType = "PIPELINE_PROXY";
PipelineProxyStage::PipelineProxyStage(intrusive_ptr<Pipeline> pipeline,
const std::shared_ptr<PlanExecutor>& child,
WorkingSet* ws)
: _pipeline(pipeline)
, _includeMetaData(_pipeline->getContext()->inShard) // send metadata to merger
, _childExec(child)
, _ws(ws)
{}
PlanStage::StageState PipelineProxyStage::work(WorkingSetID* out) {
if (!out) {
return PlanStage::FAILURE;
}
if (!_stash.empty()) {
*out = _ws->allocate();
WorkingSetMember* member = _ws->get(*out);
member->obj = Snapshotted<BSONObj>(SnapshotId(), _stash.back());
_stash.pop_back();
member->state = WorkingSetMember::OWNED_OBJ;
return PlanStage::ADVANCED;
}
if (boost::optional<BSONObj> next = getNextBson()) {
*out = _ws->allocate();
WorkingSetMember* member = _ws->get(*out);
member->obj = Snapshotted<BSONObj>(SnapshotId(), *next);
member->state = WorkingSetMember::OWNED_OBJ;
return PlanStage::ADVANCED;
}
return PlanStage::IS_EOF;
}
bool PipelineProxyStage::isEOF() {
if (!_stash.empty())
return false;
if (boost::optional<BSONObj> next = getNextBson()) {
_stash.push_back(*next);
return false;
}
return true;
}
void PipelineProxyStage::invalidate(OperationContext* txn,
const RecordId& dl,
InvalidationType type) {
// propagate to child executor if still in use
if (std::shared_ptr<PlanExecutor> exec = _childExec.lock()) {
exec->invalidate(txn, dl, type);
}
}
void PipelineProxyStage::saveState() {
_pipeline->getContext()->opCtx = NULL;
}
void PipelineProxyStage::restoreState(OperationContext* opCtx) {
invariant(_pipeline->getContext()->opCtx == NULL);
_pipeline->getContext()->opCtx = opCtx;
}
void PipelineProxyStage::pushBack(const BSONObj& obj) {
_stash.push_back(obj);
}
vector<PlanStage*> PipelineProxyStage::getChildren() const {
vector<PlanStage*> empty;
return empty;
}
PlanStageStats* PipelineProxyStage::getStats() {
std::unique_ptr<PlanStageStats> ret(new PlanStageStats(CommonStats(kStageType),
STAGE_PIPELINE_PROXY));
ret->specific.reset(new CollectionScanStats());
return ret.release();
}
boost::optional<BSONObj> PipelineProxyStage::getNextBson() {
if (boost::optional<Document> next = _pipeline->output()->getNext()) {
if (_includeMetaData) {
return next->toBsonWithMetaData();
}
else {
return next->toBson();
}
}
return boost::none;
}
shared_ptr<PlanExecutor> PipelineProxyStage::getChildExecutor() {
return _childExec.lock();
}
} // namespace mongo
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