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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/base/error_codes.h"
#include "mongo/db/query/plan_executor.h"
namespace mongo {
/**
* A custom yield policy that always reports the plan should yield, and always returns
* ErrorCodes::ExceededTimeLimit from yield().
*/
class AlwaysTimeOutYieldPolicy final : public PlanYieldPolicy {
public:
AlwaysTimeOutYieldPolicy(PlanExecutor* exec)
: PlanYieldPolicy(PlanYieldPolicy::YieldPolicy::ALWAYS_TIME_OUT,
exec->getOpCtx()->getServiceContext()->getFastClockSource(),
0,
Milliseconds{0}) {}
AlwaysTimeOutYieldPolicy(ClockSource* cs)
: PlanYieldPolicy(PlanYieldPolicy::YieldPolicy::ALWAYS_TIME_OUT, cs, 0, Milliseconds{0}) {}
bool shouldYieldOrInterrupt(OperationContext*) override {
return true;
}
Status yield(OperationContext*, std::function<void()> whileYieldingFn) override {
return {ErrorCodes::ExceededTimeLimit, "Using AlwaysTimeOutYieldPolicy"};
}
};
/**
* A custom yield policy that always reports the plan should yield, and always returns
* ErrorCodes::QueryPlanKilled from yield().
*/
class AlwaysPlanKilledYieldPolicy final : public PlanYieldPolicy {
public:
AlwaysPlanKilledYieldPolicy(PlanExecutor* exec)
: PlanYieldPolicy(PlanYieldPolicy::YieldPolicy::ALWAYS_MARK_KILLED,
exec->getOpCtx()->getServiceContext()->getFastClockSource(),
0,
Milliseconds{0}) {}
AlwaysPlanKilledYieldPolicy(ClockSource* cs)
: PlanYieldPolicy(
PlanYieldPolicy::YieldPolicy::ALWAYS_MARK_KILLED, cs, 0, Milliseconds{0}) {}
bool shouldYieldOrInterrupt(OperationContext*) override {
return true;
}
Status yield(OperationContext*, std::function<void()> whileYieldingFn) override {
return {ErrorCodes::QueryPlanKilled, "Using AlwaysPlanKilledYieldPolicy"};
}
};
class NoopYieldPolicy final : public PlanYieldPolicy {
public:
NoopYieldPolicy(ClockSource* clockSource)
: PlanYieldPolicy(PlanYieldPolicy::YieldPolicy::NO_YIELD, clockSource, 0, Milliseconds{0}) {
}
bool shouldYieldOrInterrupt(OperationContext*) override {
return false;
}
Status yield(OperationContext*, std::function<void()> whileYieldingFn) override {
MONGO_UNREACHABLE;
}
};
} // namespace mongo
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