Newtonsoft.Json/Serialization/MemoryTraceWriter.cs

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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;
        }