onlyonceerrorhandler.h

功能非常强的写日志程序

/*
 * Copyright 2003,2004 The Apache Software Foundation.
 * 
 * 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 _LOG4CXX_HELPERS_ONLY_ONCE_ERROR_HANDLER_H
#define _LOG4CXX_HELPERS_ONLY_ONCE_ERROR_HANDLER_H

#include <log4cxx/spi/errorhandler.h>
#include <log4cxx/helpers/objectimpl.h>

namespace log4cxx
{
	namespace helpers
	{
		/**
		The <code>OnlyOnceErrorHandler</code> implements log4cxx's default
		error handling policy which consists of emitting a message for the
		first error in an appender and ignoring all following errors.

		<p>The error message is printed on <code>System.err</code>.

		<p>This policy aims at protecting an otherwise working application
		from being flooded with error messages when logging fails
		*/
		class LOG4CXX_EXPORT OnlyOnceErrorHandler : 
			public virtual spi::ErrorHandler,
			public virtual ObjectImpl
		{
		private:
			String WARN_PREFIX;
			String ERROR_PREFIX;
			mutable bool firstTime;

		public:
			DECLARE_LOG4CXX_OBJECT(OnlyOnceErrorHandler)
			BEGIN_LOG4CXX_CAST_MAP()
				LOG4CXX_CAST_ENTRY(spi::OptionHandler)
				LOG4CXX_CAST_ENTRY(spi::ErrorHandler)
			END_LOG4CXX_CAST_MAP()

			OnlyOnceErrorHandler();

			/**
			 Does not do anything.
			 */
            void setLogger(const LoggerPtr& logger);


            /**
            No options to activate.
            */
            void activateOptions();
            void setOption(const String& name, const String& value);


            /**
            Prints the message and the stack trace of the exception on
            <code>System.err</code>.  */
            void error(const String& message, Exception& e,
				int errorCode) const;
            /**
            Prints the message and the stack trace of the exception on
            <code>System.err</code>.
            */
            void error(const String& message, Exception& e,
				int errorCode, const spi::LoggingEventPtr& event) const;
            
            /**
            Print a the error message passed as parameter on
            <code>System.err</code>.
            */
             void error(const String& message) const;

            /**
            Does not do anything.
            */
            void setAppender(const AppenderPtr& appender);

            /**
            Does not do anything.
            */
            void setBackupAppender(const AppenderPtr& appender);
		};
	}  // namespace helpers
}; // namespace log4cxx

#endif //_LOG4CXX_HELPERS_ONLY_ONCE_ERROR_HANDLER_H