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// server_parameters_inline.h
/**
* Copyright (C) 2012 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.
*/
#include "mongo/util/stringutils.h"
namespace mongo {
// We create template specializations for each possible value type which is supported at runtime.
// The only value types which are supported at runtime are types which can be stored in
// AtomicWord<T> or AtomicProxy<T> which both have explicit load and store methods. The storage type
// for a value type is chosen by the server_parameter_storage_type type trait. Since there is no
// support for partial template specialization of member functions, we generate 4 (the Atomic types)
// x 2 (RuntimeOnly, StartupAndRuntime) implementations of append and set.
#define EXPORTED_ATOMIC_SERVER_PARAMETER_TYPE(VALUE_TYPE, PARAM_TYPE) \
template <> \
inline void ExportedServerParameter<VALUE_TYPE, PARAM_TYPE>::append( \
OperationContext* txn, BSONObjBuilder& b, const std::string& name) { \
b.append(name, _value->load()); \
} \
\
template <> \
inline Status ExportedServerParameter<VALUE_TYPE, PARAM_TYPE>::set( \
const VALUE_TYPE& newValue) { \
Status v = validate(newValue); \
if (!v.isOK()) \
return v; \
\
_value->store(newValue); \
return Status::OK(); \
}
#define EXPORTED_ATOMIC_SERVER_PARAMETER(PARAM_TYPE) \
EXPORTED_ATOMIC_SERVER_PARAMETER_TYPE(bool, PARAM_TYPE) \
EXPORTED_ATOMIC_SERVER_PARAMETER_TYPE(int, PARAM_TYPE) \
EXPORTED_ATOMIC_SERVER_PARAMETER_TYPE(long long, PARAM_TYPE) \
EXPORTED_ATOMIC_SERVER_PARAMETER_TYPE(double, PARAM_TYPE)
EXPORTED_ATOMIC_SERVER_PARAMETER(ServerParameterType::kRuntimeOnly);
EXPORTED_ATOMIC_SERVER_PARAMETER(ServerParameterType::kStartupAndRuntime);
template <typename T, ServerParameterType paramType>
inline Status ExportedServerParameter<T, paramType>::set(const BSONElement& newValueElement) {
T newValue;
if (!newValueElement.coerce(&newValue))
return Status(ErrorCodes::BadValue, "can't set value");
return set(newValue);
}
template <typename T, ServerParameterType paramType>
inline Status ExportedServerParameter<T, paramType>::set(const T& newValue) {
Status v = validate(newValue);
if (!v.isOK())
return v;
*_value = newValue;
return Status::OK();
}
template <typename T, ServerParameterType paramType>
void ExportedServerParameter<T, paramType>::append(OperationContext* txn,
BSONObjBuilder& b,
const std::string& name) {
b.append(name, *_value);
}
} // namespace mongo
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