pos/is4c-nf/scale-drivers/drivers/NewMagellan/Newtonsoft.Json/Serialization/MemoryTraceWriter.cs
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Text;
namespace Newtonsoft.Json.Serialization
{
/// <summary>
/// Represents a trace writer that writes to memory. When the trace message limit is
/// reached then old trace messages will be removed as new messages are added.
/// </summary>
public class MemoryTraceWriter : ITraceWriter
{
private readonly Queue<string> _traceMessages;
/// <summary>
/// Gets the <see cref="TraceLevel"/> that will be used to filter the trace messages passed to the writer.
/// For example a filter level of <code>Info</code> will exclude <code>Verbose</code> messages and include <code>Info</code>,
/// <code>Warning</code> and <code>Error</code> messages.
/// </summary>
/// <value>
/// The <see cref="TraceLevel"/> that will be used to filter the trace messages passed to the writer.
/// </value>
public TraceLevel LevelFilter { get; set; }
/// <summary>
/// Initializes a new instance of the <see cref="MemoryTraceWriter"/> class.
/// </summary>
public MemoryTraceWriter()
{
LevelFilter = TraceLevel.Verbose;
_traceMessages = new Queue<string>();
}
/// <summary>
/// Writes the specified trace level, message and optional exception.
/// </summary>
/// <param name="level">The <see cref="TraceLevel"/> at which to write this trace.</param>
/// <param name="message">The trace message.</param>
/// <param name="ex">The trace exception. This parameter is optional.</param>
public void Trace(TraceLevel level, string message, Exception ex)
{
string traceMessage = DateTime.Now.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff", CultureInfo.InvariantCulture) + " " + level.ToString("g") + " " + message;
if (_traceMessages.Count >= 1000)
_traceMessages.Dequeue();
_traceMessages.Enqueue(traceMessage);
}
/// <summary>
/// Returns an enumeration of the most recent trace messages.
/// </summary>
/// <returns>An enumeration of the most recent trace messages.</returns>
public IEnumerable<string> GetTraceMessages()
{
return _traceMessages;
}
/// <summary>
/// Returns a <see cref="String"/> of the most recent trace messages.
/// </summary>
/// <returns>
/// A <see cref="String"/> of the most recent trace messages.
/// </returns>
public override string ToString()
{
StringBuilder sb = new StringBuilder();
foreach (string traceMessage in _traceMessages)
{
if (sb.Length > 0)
sb.AppendLine();
sb.Append(traceMessage);
}
return sb.ToString();
}
}
}