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arangodb/lib/Logger/LoggerStream.h

103 lines
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C++

////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2013 triAGENS GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
////////////////////////////////////////////////////////////////////////////////
#ifndef ARANGODB_LOGGER_LOGGER_STREAM_H
#define ARANGODB_LOGGER_LOGGER_STREAM_H 1
#include "Logger/LogTopic.h"
#include "Logger/Logger.h"
#include <sstream>
namespace arangodb {
class LoggerStream {
LoggerStream(LoggerStream const&) = delete;
LoggerStream& operator=(LoggerStream const&) = delete;
public:
LoggerStream()
: _topicId(LogTopic::MAX_LOG_TOPICS),
_level(LogLevel::DEFAULT),
_line(0),
_file(nullptr),
_function(nullptr) {}
~LoggerStream();
public:
LoggerStream& operator<<(LogLevel level) {
_level = level;
return *this;
}
LoggerStream& operator<<(LogTopic topic) {
_topicId = topic.id();
_out << topic.displayName();
return *this;
}
LoggerStream& operator<<(Logger::BINARY const& binary);
LoggerStream& operator<<(Logger::CHARS const& chars);
LoggerStream& operator<<(Logger::RANGE const& range);
LoggerStream& operator<<(Logger::FIXED const& duration);
LoggerStream& operator<<(Logger::LINE const& line) {
_line = line._line;
return *this;
}
LoggerStream& operator<<(Logger::FILE const& file) {
_file = file._file;
return *this;
}
LoggerStream& operator<<(Logger::FUNCTION const& function) {
_function = function._function;
return *this;
}
template <typename T>
LoggerStream& operator<<(T const& obj) {
try {
_out << obj;
} catch (...) {
// ignore any errors here. logging should not have side effects
}
return *this;
}
private:
std::stringstream _out;
size_t _topicId;
LogLevel _level;
int _line;
char const* _file;
char const* _function;
};
} // namespace arangodb
#endif