logger.h

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// Copyright 2017-2020, Schlumberger
//
// 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.
 
#pragma once
 
#include "../declspec.h"
 
#include <string>
#include <sstream>
#include <functional>
 
namespace InternalZGY {
#if 0
}
#endif
 
class OPENZGY_API LoggerBase
{
public:
  typedef std::function<bool(int, const std::string&)> LoggerFn;
  static int getVerboseFromEnv(const char *envname);
  static bool logger(const LoggerFn& logger, int priority, const std::string& str = std::string());
  static bool logger(const LoggerFn& logger, int priority, const std::ios& ss);
  static LoggerFn emptyCallback();
  static LoggerFn standardCallback(int level, const std::string& prefix, const std::string& suffix);
};
 
 
class OPENZGY_API Logger : public LoggerBase
{
public:
  Logger();
  static Logger* instance();
  const LoggerFn& getCallback() const;
  static const LoggerFn& getForwarder();
  void setCallback(const LoggerFn& callback);
  void setCallback(int currentlevel);
private:
  LoggerFn callback_;
};
 
extern OPENZGY_API bool newlogger(int priority, const std::string& str);
extern OPENZGY_API bool newlogger(int priority, const std::ios& ss);
 
} // namespace