loggerinstance.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
 
#ifndef LOG4CXX_LOGGER_INSTANCE_HDR_
#define LOG4CXX_LOGGER_INSTANCE_HDR_
 
#include <log4cxx/logmanager.h>
#include <log4cxx/logger.h>
 
namespace LOG4CXX_NS
{

 class LoggerInstancePtr
{
    bool m_hadConfiguration; 
    LoggerPtr m_logger;
public: // ...structors
    LoggerInstancePtr() : m_hadConfiguration(false)
    {}

    template <class StringType>
    LoggerInstancePtr(const StringType& instanceName)
        : m_hadConfiguration(LogManager::exists(instanceName))
        , m_logger(LogManager::getLogger(instanceName))
    {
    }

    ~LoggerInstancePtr()
    {
        reset();
    }
 
    const LoggerPtr& operator->() const noexcept
    {
        return m_logger;
    }
 
    explicit operator bool() const noexcept
    {
        return !!m_logger;
    }
 
    operator LoggerPtr&() noexcept
    {
        return m_logger;
    }
 
    operator const LoggerPtr&() const noexcept
    {
        return m_logger;
    }
 
    Logger* get() noexcept
    {
        return m_logger.get();
    }
 
    const Logger* get() const noexcept
    {
        return m_logger.get();
    }

    void reset()
    {
        if (m_logger && !m_hadConfiguration)
        {
            auto name = m_logger->getName();
            m_logger.reset(); // Decrease reference count
            LogManager::removeLogger(name);
        }
        else
        {
            m_hadConfiguration = false;
            m_logger.reset();
        }
    }

    template <class StringType>
    void reset(const StringType& instanceName)
    {
        reset();
        m_hadConfiguration = !!LogManager::exists(instanceName);
        m_logger = LogManager::getLogger(instanceName);
    }
};
 
} // namespace LOG4CXX_NS
 
#endif // LOG4CXX_LOGGER_INSTANCE_HDR_