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/******************************************************************************
*
* package: Log4Qt
* file: mdc.h
* created: September 2007
* author: Martin Heinrich
*
*
* Copyright 2007 Martin Heinrich
*
* 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.
*
******************************************************************************/
#ifndef LOG4QT_MDC_H
#define LOG4QT_MDC_H
/******************************************************************************
* Dependencies
******************************************************************************/
#include <QtCore/QString>
#include <QtCore/QHash>
#include <QtCore/QThreadStorage>
#include "log4qt.h"
/******************************************************************************
* Declarations
******************************************************************************/
namespace Log4Qt
{
/*!
* \brief The class MDC implements a mapped diagnostic context.
*
* \note All the functions declared in this class are thread-safe.
*/
class LOG4QT_EXPORT MDC
{
private:
MDC();
MDC(const MDC &rOther); // Not implemented
// virtual ~MDC(); // Use compiler default
MDC &operator=(const MDC &rOther); // Not implemented
public:
static QString get(const QString &rKey);
static QHash<QString, QString> context();
/*!
* Returns the MDC instance.
*/
static MDC *instance();
static void put(const QString &rKey, const QString &rValue);
static void remove(const QString &rKey);
private:
static QHash<QString, QString> *localData();
private:
QThreadStorage< QHash<QString, QString> * > mHash;
};
/**************************************************************************
* Operators, Helper
**************************************************************************/
#ifndef QT_NO_DEBUG_STREAM
/*!
* \relates MDC
*
* Writes all object member variables to the given debug stream \a rDebug
* and returns the stream.
*
* <tt>
* %MDC(thread:"main" context:QHash(("login", "Peter")("database", "UAT")) )
* </tt>
* \sa QDebug
*/
QDebug operator<<(QDebug debug,
const MDC &rMDC);
#endif // QT_NO_DEBUG_STREAM
/**************************************************************************
* Inline
**************************************************************************/
inline MDC::MDC() :
mHash()
{}
inline void MDC::put(const QString &rKey, const QString &rValue)
{ localData()->insert(rKey, rValue); }
inline void MDC::remove(const QString &rKey)
{ localData()->remove(rKey); }
} // namespace Log4Qt
// Q_DECLARE_TYPEINFO(Log4Qt::MDC, Q_COMPLEX_TYPE); // Use default
#endif // LOG4QT_MDC_H
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