relativetimedateformat.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_RELATIVE_TIME_DATE_FORMAT_H
#define _LOG4CXX_HELPERS_RELATIVE_TIME_DATE_FORMAT_H

#include <log4cxx/helpers/dateformat.h>
#include <log4cxx/helpers/system.h>

namespace log4cxx
{
	namespace helpers
	{
		/**
		Formats a date by printing the number of seconds
		elapsed since the start of the application. This is the fastest
		printing DateFormat in the package.
		*/
		class LOG4CXX_EXPORT RelativeTimeDateFormat : public DateFormat
		{
		protected:
			int64_t startTime;
			
		public:
			RelativeTimeDateFormat()
			 : DateFormat(_T(""), 0), startTime(System::currentTimeMillis())
			{
			}
			
			virtual void format(ostream& os, int64_t time) const
			{
				os << (time - startTime);
			}
		};
	}  // namespace helpers
}; // namespace log4cxx

#endif // _LOG4CXX_HELPERS_RELATIVE_TIME_DATE_FORMAT_H