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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
{
/**
* Base class for logger output utility classes.
* \headerfile Ice/Ice.h
*/
class ICE_API LoggerOutputBase : private IceUtil::noncopyable
{
public:
/** Obtains the collected output. */
std::string str() const;
/// \cond INTERNAL
std::ostringstream& _stream(); // For internal use only. Don't use in your code.
/// \endcond
private:
std::ostringstream _os;
};
/// \cond INTERNAL
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&));
/// \endcond
/**
* Collects output and flushes it via a logger method.
* \headerfile Ice/Ice.h
*/
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();
}
/** Flushes the colleted output to the logger method. */
inline void flush()
{
std::string s = _stream().str();
if(!s.empty())
{
L& ref = *_logger;
(ref.*output)(s);
}
_stream().str("");
}
private:
LPtr _logger;
};
/** Flushes output to Logger::print. */
typedef LoggerOutput<Logger, LoggerPtr, &Logger::print> Print;
/** Flushes output to Logger::warning. */
typedef LoggerOutput<Logger, LoggerPtr, &Logger::warning> Warning;
/** Flushes output to Logger::error. */
typedef LoggerOutput<Logger, LoggerPtr, &Logger::error> Error;
/**
* Flushes output to Logger::trace.
* \headerfile Ice/Ice.h
*/
class ICE_API Trace : public LoggerOutputBase
{
public:
Trace(const LoggerPtr&, const std::string&);
~Trace();
void flush();
private:
LoggerPtr _logger;
std::string _category;
};
/**
* A special plug-in that installs a logger during a communicator's initialization.
* Both initialize and destroy are no-op. See Ice::InitializationData.
* \headerfile Ice/Ice.h
*/
class ICE_API LoggerPlugin : public Ice::Plugin
{
public:
/**
* Constructs the plug-in with a target communicator and a logger.
* @param communicator The communicator in which to install the logger.
* @param logger The logger to be installed.
*/
LoggerPlugin(const CommunicatorPtr& communicator, const LoggerPtr& logger);
/** This method is a no-op. */
virtual void initialize();
/** This method is a no-op. */
virtual void destroy();
};
}
#endif
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