add front demo in this project

LFtid1056/cloudfront/code/log4cplus/spi/loggerfactory.h

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+// -*- C++ -*-
+// Module:  Log4CPLUS
+// File:    loggerfactory.h
+// Created: 6/2001
+// Author:  Tad E. Smith
+//
+//
+// Copyright 2001-2017 Tad E. Smith
+//
+// 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.
+
+/** @file */
+
+#ifndef LOG4CPLUS_SPI_LOGGER_FACTORY_HEADER
+#define LOG4CPLUS_SPI_LOGGER_FACTORY_HEADER
+
+#include <log4cplus/config.hxx>
+
+#if defined (LOG4CPLUS_HAVE_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <log4cplus/tstring.h>
+
+
+namespace log4cplus {
+    // Forward Declarations
+    class Logger;
+    class Hierarchy;
+
+    namespace spi {
+        class LoggerImpl;
+
+        /**
+         * Implement this interface to create new instances of Logger or
+         * a sub-class of Logger.
+         */
+        class LOG4CPLUS_EXPORT LoggerFactory {
+        public:
+            /**
+             * Creates a new <code>Logger</code> object.
+             */
+            virtual Logger makeNewLoggerInstance(const log4cplus::tstring& name,
+                                                 Hierarchy& h) = 0;
+            virtual ~LoggerFactory() = 0;
+
+        protected:
+            virtual LoggerImpl * makeNewLoggerImplInstance(
+                const log4cplus::tstring& name, Hierarchy& h) = 0;
+        };
+
+    } // end namespace spi
+} // end namespace log4cplus
+
+#endif // LOG4CPLUS_SPI_LOGGER_FACTORY_HEADER