#region Apache License
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//
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// Licensed to the Apache Software Foundation (ASF) under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// The ASF licenses this file to you under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#endregion
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using System;
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using System.Text;
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using System.IO;
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using log4net.Core;
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namespace log4net.Layout.Pattern
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{
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/// <summary>
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/// Converter to output the relative time of the event
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/// </summary>
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/// <remarks>
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/// <para>
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/// Converter to output the time of the event relative to the start of the program.
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/// </para>
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/// </remarks>
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/// <author>Nicko Cadell</author>
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internal sealed class RelativeTimePatternConverter : PatternLayoutConverter
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{
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/// <summary>
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/// Write the relative time to the output
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/// </summary>
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/// <param name="writer"><see cref="TextWriter" /> that will receive the formatted result.</param>
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/// <param name="loggingEvent">the event being logged</param>
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/// <remarks>
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/// <para>
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/// Writes out the relative time of the event in milliseconds.
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/// That is the number of milliseconds between the event <see cref="LoggingEvent.TimeStamp"/>
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/// and the <see cref="LoggingEvent.StartTime"/>.
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/// </para>
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/// </remarks>
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override protected void Convert(TextWriter writer, LoggingEvent loggingEvent)
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{
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writer.Write( TimeDifferenceInMillis(LoggingEvent.StartTime, loggingEvent.TimeStamp).ToString(System.Globalization.NumberFormatInfo.InvariantInfo) );
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}
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/// <summary>
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/// Helper method to get the time difference between two DateTime objects
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/// </summary>
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/// <param name="start">start time (in the current local time zone)</param>
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/// <param name="end">end time (in the current local time zone)</param>
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/// <returns>the time difference in milliseconds</returns>
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private static long TimeDifferenceInMillis(DateTime start, DateTime end)
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{
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// We must convert all times to UTC before performing any mathematical
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// operations on them. This allows use to take into account discontinuities
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// caused by daylight savings time transitions.
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return (long)(end.ToUniversalTime() - start.ToUniversalTime()).TotalMilliseconds;
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}
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}
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}
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