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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.
*/
#pragma once
#include "mongo/db/clientcursor.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/lite_parsed_query.h"
#include "mongo/db/query/plan_cache.h"
#include "mongo/db/query/plan_executor.h"
#include "mongo/db/query/runner.h"
#include "mongo/db/query/stage_builder.h"
namespace mongo {
/**
* This is a runner that was requested by an internal client of the query system, as opposed to
* runners that are built in response to a query entering the system. It is only used by
* internal clients of the query systems (e.g., chunk migration, index building, commands that
* traverse data such as md5, ... )
*
* The salient feature of this Runner is that it does not interact with the cache at all.
*/
class InternalRunner : public Runner {
public:
/**
* Takes ownership of all arguments.
*/
InternalRunner(const string& ns, PlanStage* root, WorkingSet* ws)
: _ns(ns), _exec(new PlanExecutor(ws, root)), _policy(Runner::YIELD_MANUAL) { }
virtual ~InternalRunner() {
if (Runner::YIELD_AUTO == _policy) {
ClientCursor::deregisterRunner(this);
}
}
Runner::RunnerState getNext(BSONObj* objOut, DiskLoc* dlOut) {
return _exec->getNext(objOut, dlOut);
}
virtual bool isEOF() { return _exec->isEOF(); }
virtual void saveState() { _exec->saveState(); }
virtual bool restoreState() { return _exec->restoreState(); }
virtual const string& ns() { return _ns; }
virtual void invalidate(const DiskLoc& dl) { _exec->invalidate(dl); }
virtual void setYieldPolicy(Runner::YieldPolicy policy) {
// No-op.
if (_policy == policy) { return; }
if (Runner::YIELD_AUTO == policy) {
// Going from manual to auto.
ClientCursor::registerRunner(this);
}
else {
// Going from auto to manual.
ClientCursor::deregisterRunner(this);
}
_policy = policy;
_exec->setYieldPolicy(policy);
}
virtual void kill() { _exec->kill(); }
private:
string _ns;
scoped_ptr<PlanExecutor> _exec;
Runner::YieldPolicy _policy;
};
} // namespace mongo
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