add front demo in this project

LFtid1056/cloudfront/code/log4cplus/mdc.h

@@ -0,0 +1,77 @@
+// -*- C++ -*-
+//  Copyright (C) 2010-2017, Vaclav Haisman. All rights reserved.
+//  
+//  Redistribution and use in source and binary forms, with or without modifica-
+//  tion, are permitted provided that the following conditions are met:
+//  
+//  1. Redistributions of  source code must  retain the above copyright  notice,
+//     this list of conditions and the following disclaimer.
+//  
+//  2. Redistributions in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//  
+//  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
+//  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+//  FITNESS  FOR A PARTICULAR  PURPOSE ARE  DISCLAIMED.  IN NO  EVENT SHALL  THE
+//  APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
+//  INDIRECT, INCIDENTAL, SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLU-
+//  DING, BUT NOT LIMITED TO, PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS
+//  OF USE, DATA, OR  PROFITS; OR BUSINESS  INTERRUPTION)  HOWEVER CAUSED AND ON
+//  ANY  THEORY OF LIABILITY,  WHETHER  IN CONTRACT,  STRICT LIABILITY,  OR TORT
+//  (INCLUDING  NEGLIGENCE OR  OTHERWISE) ARISING IN  ANY WAY OUT OF THE  USE OF
+//  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef LOG4CPLUS_MDC_H_HEADER
+#define LOG4CPLUS_MDC_H_HEADER
+
+#include <log4cplus/config.hxx>
+
+#if defined (LOG4CPLUS_HAVE_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <log4cplus/tstring.h>
+
+#include <map>
+
+
+namespace log4cplus
+{
+
+
+typedef std::map<tstring, tstring> MappedDiagnosticContextMap;
+
+
+class LOG4CPLUS_EXPORT MDC
+{
+public:
+    /**
+     * Clear any nested diagnostic information if any. This method is
+     * useful in cases where the same thread can be potentially used
+     * over and over in different unrelated contexts.
+     */
+    void clear();
+
+    void put (tstring const & key, tstring const & value);
+    bool get (tstring * value, tstring const & key) const;
+    void remove (tstring const & key);
+
+    MappedDiagnosticContextMap const & getContext () const;
+
+    // Public ctor and dtor but only to be used by internal::DefaultContext.
+    MDC ();
+    virtual ~MDC ();
+
+private:
+    LOG4CPLUS_PRIVATE static MappedDiagnosticContextMap * getPtr ();
+};
+
+
+LOG4CPLUS_EXPORT MDC & getMDC ();
+
+
+} // namespace log4cplus
+
+
+#endif // LOG4CPLUS_MDC_H_HEADER