LoggerUtil.h

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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
 
#ifndef ICE_LOGGER_UTIL_H
#define ICE_LOGGER_UTIL_H
 
#include <Ice/Logger.h>
#include <Ice/CommunicatorF.h>
#include <Ice/Plugin.h>
#include <Ice/Exception.h>
 
namespace Ice
{

class ICE_API LoggerOutputBase : private IceUtil::noncopyable
{
public:

    std::string str() const;

    std::ostringstream& _stream(); // For internal use only. Don't use in your code.
 
private:
 
    std::ostringstream _os;
};

ICE_API LoggerOutputBase& loggerInsert(LoggerOutputBase& out, const IceUtil::Exception& ex);
 
template<typename T>
struct IsException
{
    static char testex(IceUtil::Exception*);
    static long testex(...);
 
    static const bool value = sizeof(testex(static_cast<T*>(0))) == sizeof(char);
};
 
template<typename T, bool = false>
struct LoggerOutputInserter
{
    static inline LoggerOutputBase&
    insert(LoggerOutputBase& out, const T& val)
    {
        out._stream() << val;
        return out;
    }
};
 
// Partial specialization
template<typename T>
struct LoggerOutputInserter<T, true>
{
    static inline LoggerOutputBase&
    insert(LoggerOutputBase& out, const T& ex)
    {
        return loggerInsert(out, ex);
    }
};
 
template<typename T>
inline LoggerOutputBase&
operator<<(LoggerOutputBase& out, const T& val)
{
    return LoggerOutputInserter<T, IsException<T>::value>::insert(out, val);
}
 
#ifdef ICE_CPP11_MAPPING
template<typename T, typename ::std::enable_if<::std::is_base_of<::Ice::ObjectPrx, T>::value>::type* = nullptr>
inline LoggerOutputBase&
operator<<(LoggerOutputBase& os, const ::std::shared_ptr<T>& p)
#else
template<typename T>
inline LoggerOutputBase&
operator<<(LoggerOutputBase& os, const ::IceInternal::ProxyHandle<T>& p)
#endif
{
    return os << (p ? p->ice_toString() : "");
}
 
inline LoggerOutputBase&
operator<<(LoggerOutputBase& out, const ::std::exception& ex)
{
    out._stream() << ex.what();
    return out;
}
 
ICE_API LoggerOutputBase& operator<<(LoggerOutputBase&, std::ios_base& (*)(std::ios_base&));

template<class L, class LPtr, void (L::*output)(const std::string&)>
class LoggerOutput : public LoggerOutputBase
{
public:
    inline LoggerOutput(const LPtr& lptr) :
        _logger(lptr)
    {}
 
    inline ~LoggerOutput()
    {
        flush();
    }

    inline void flush()
    {
        std::string s = _stream().str();
        if(!s.empty())
        {
            L& ref = *_logger;
            (ref.*output)(s);
        }
        _stream().str("");
    }
 
private:
 
    LPtr _logger;
};

typedef LoggerOutput<Logger, LoggerPtr, &Logger::print> Print;

typedef LoggerOutput<Logger, LoggerPtr, &Logger::warning> Warning;

typedef LoggerOutput<Logger, LoggerPtr, &Logger::error> Error;

class ICE_API Trace : public LoggerOutputBase
{
public:
    Trace(const LoggerPtr&, const std::string&);
    ~Trace();
    void flush();
 
private:
 
    LoggerPtr _logger;
    std::string _category;
};

class ICE_API LoggerPlugin : public Ice::Plugin
{
public:

    LoggerPlugin(const CommunicatorPtr& communicator, const LoggerPtr& logger);

    virtual void initialize();

    virtual void destroy();
};
 
}
 
#endif