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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/delete.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/repl/repl_coordinator_global.h"
#include "mongo/util/log.h"
namespace mongo {
// static
const char* DeleteStage::kStageType = "DELETE";
DeleteStage::DeleteStage(OperationContext* txn,
const DeleteStageParams& params,
WorkingSet* ws,
Collection* collection,
PlanStage* child)
: _txn(txn),
_params(params),
_ws(ws),
_collection(collection),
_child(child),
_commonStats(kStageType) { }
DeleteStage::~DeleteStage() {}
bool DeleteStage::isEOF() {
if (!_collection) {
return true;
}
if (!_params.isMulti && _specificStats.docsDeleted > 0) {
return true;
}
return _child->isEOF();
}
PlanStage::StageState DeleteStage::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; }
invariant(_collection); // If isEOF() returns false, we must have a collection.
WorkingSetID id = WorkingSet::INVALID_ID;
StageState status = _child->work(&id);
if (PlanStage::ADVANCED == status) {
WorkingSetMember* member = _ws->get(id);
if (!member->hasLoc()) {
_ws->free(id);
const std::string errmsg = "delete stage failed to read member w/ loc from child";
*out = WorkingSetCommon::allocateStatusMember(_ws, Status(ErrorCodes::InternalError,
errmsg));
return PlanStage::FAILURE;
}
DiskLoc rloc = member->loc;
_ws->free(id);
BSONObj deletedDoc;
WriteUnitOfWork wunit(_txn);
// TODO: Do we want to buffer docs and delete them in a group rather than
// saving/restoring state repeatedly?
saveState();
const bool deleteCappedOK = false;
const bool deleteNoWarn = false;
_collection->deleteDocument(_txn, rloc, deleteCappedOK, deleteNoWarn,
_params.shouldCallLogOp ? &deletedDoc : NULL);
restoreState(_txn);
++_specificStats.docsDeleted;
if (_params.shouldCallLogOp) {
if (deletedDoc.isEmpty()) {
log() << "Deleted object without id in collection " << _collection->ns()
<< ", not logging.";
}
else {
bool replJustOne = true;
repl::logOp(_txn, "d", _collection->ns().ns().c_str(), deletedDoc, 0,
&replJustOne);
}
}
wunit.commit();
_txn->recoveryUnit()->commitIfNeeded();
++_commonStats.needTime;
return PlanStage::NEED_TIME;
}
else if (PlanStage::FAILURE == status) {
*out = id;
// If a stage fails, it may create a status WSM to indicate why it failed, in which case
// 'id' is valid. If ID is invalid, we create our own error message.
if (WorkingSet::INVALID_ID == id) {
const std::string errmsg = "delete stage failed to read in results from child";
*out = WorkingSetCommon::allocateStatusMember(_ws, Status(ErrorCodes::InternalError,
errmsg));
return PlanStage::FAILURE;
}
return status;
}
else {
if (PlanStage::NEED_TIME == status) {
++_commonStats.needTime;
}
return status;
}
}
void DeleteStage::saveState() {
++_commonStats.yields;
_child->saveState();
}
void DeleteStage::restoreState(OperationContext* opCtx) {
++_commonStats.unyields;
_child->restoreState(opCtx);
}
void DeleteStage::invalidate(const DiskLoc& dl, InvalidationType type) {
++_commonStats.invalidates;
_child->invalidate(dl, type);
}
vector<PlanStage*> DeleteStage::getChildren() const {
vector<PlanStage*> children;
children.push_back(_child.get());
return children;
}
PlanStageStats* DeleteStage::getStats() {
_commonStats.isEOF = isEOF();
auto_ptr<PlanStageStats> ret(new PlanStageStats(_commonStats, STAGE_DELETE));
ret->specific.reset(new DeleteStats(_specificStats));
ret->children.push_back(_child->getStats());
return ret.release();
}
const CommonStats* DeleteStage::getCommonStats() {
return &_commonStats;
}
const SpecificStats* DeleteStage::getSpecificStats() {
return &_specificStats;
}
} // namespace mongo
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