100 lines
3.5 KiB
C#
100 lines
3.5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Globalization;
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using System.Text;
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namespace LC.Newtonsoft.Json.Serialization
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{
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/// <summary>
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/// Represents a trace writer that writes to memory. When the trace message limit is
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/// reached then old trace messages will be removed as new messages are added.
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/// </summary>
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public class MemoryTraceWriter : ITraceWriter
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{
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private readonly Queue<string> _traceMessages;
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private readonly object _lock;
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/// <summary>
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/// Gets the <see cref="TraceLevel"/> that will be used to filter the trace messages passed to the writer.
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/// For example a filter level of <see cref="TraceLevel.Info"/> will exclude <see cref="TraceLevel.Verbose"/> messages and include <see cref="TraceLevel.Info"/>,
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/// <see cref="TraceLevel.Warning"/> and <see cref="TraceLevel.Error"/> messages.
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/// </summary>
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/// <value>
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/// The <see cref="TraceLevel"/> that will be used to filter the trace messages passed to the writer.
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/// </value>
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public TraceLevel LevelFilter { get; set; }
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/// <summary>
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/// Initializes a new instance of the <see cref="MemoryTraceWriter"/> class.
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/// </summary>
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public MemoryTraceWriter()
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{
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LevelFilter = TraceLevel.Verbose;
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_traceMessages = new Queue<string>();
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_lock = new object();
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}
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/// <summary>
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/// Writes the specified trace level, message and optional exception.
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/// </summary>
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/// <param name="level">The <see cref="TraceLevel"/> at which to write this trace.</param>
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/// <param name="message">The trace message.</param>
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/// <param name="ex">The trace exception. This parameter is optional.</param>
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public void Trace(TraceLevel level, string message, Exception ex)
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{
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StringBuilder sb = new StringBuilder();
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sb.Append(DateTime.Now.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff", CultureInfo.InvariantCulture));
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sb.Append(" ");
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sb.Append(level.ToString("g"));
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sb.Append(" ");
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sb.Append(message);
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string s = sb.ToString();
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lock (_lock)
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{
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if (_traceMessages.Count >= 1000)
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{
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_traceMessages.Dequeue();
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}
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_traceMessages.Enqueue(s);
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}
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}
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/// <summary>
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/// Returns an enumeration of the most recent trace messages.
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/// </summary>
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/// <returns>An enumeration of the most recent trace messages.</returns>
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public IEnumerable<string> GetTraceMessages()
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{
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return _traceMessages;
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}
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/// <summary>
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/// Returns a <see cref="String"/> of the most recent trace messages.
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/// </summary>
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/// <returns>
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/// A <see cref="String"/> of the most recent trace messages.
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/// </returns>
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public override string ToString()
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{
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lock (_lock)
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{
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StringBuilder sb = new StringBuilder();
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foreach (string traceMessage in _traceMessages)
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{
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if (sb.Length > 0)
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{
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sb.AppendLine();
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}
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sb.Append(traceMessage);
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}
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return sb.ToString();
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}
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}
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}
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} |