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// Copyright (c) 2015 Baidu, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Author: Ge,Jun (gejun@baidu.com)
// Date: Sun Aug 9 12:26:03 CST 2015
#ifndef BVAR_GFLAG_H
#define BVAR_GFLAG_H
#include <string> // std::string
#include "bvar/variable.h"
namespace bvar {
// Expose important gflags as bvar so that they're monitored.
class GFlag : public Variable {
public:
GFlag(const butil::StringPiece& gflag_name);
GFlag(const butil::StringPiece& prefix,
const butil::StringPiece& gflag_name);
// Calling hide() in dtor manually is a MUST required by Variable.
~GFlag() { hide(); }
// Implement Variable::describe() and Variable::get_value().
void describe(std::ostream& os, bool quote_string) const;
#ifdef BAIDU_INTERNAL
void get_value(boost::any* value) const;
#endif
// Get value of the gflag.
// We don't bother making the return type generic. This function
// is just for consistency with other classes.
std::string get_value() const;
// Set the gflag with a new value.
// Returns true on success.
bool set_value(const char* value);
// name of the gflag.
const std::string& gflag_name() const {
return _gflag_name.empty() ? name() : _gflag_name;
}
private:
std::string _gflag_name;
};
} // namespace bvar
#endif //BVAR_GFLAG_H