MemoryTraceWriter
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.
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Text;
namespace Newtonsoft.Json.Serialization
{
[System.Runtime.CompilerServices.NullableContext(1)]
[System.Runtime.CompilerServices.Nullable(0)]
public class MemoryTraceWriter : ITraceWriter
{
private readonly Queue<string> _traceMessages;
private readonly object _lock;
public TraceLevel LevelFilter { get; set; }
public MemoryTraceWriter()
{
LevelFilter = TraceLevel.Verbose;
_traceMessages = new Queue<string>();
_lock = new object();
}
public void Trace(TraceLevel level, string message, [System.Runtime.CompilerServices.Nullable(2)] Exception ex)
{
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append(DateTime.Now.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff", CultureInfo.InvariantCulture));
stringBuilder.Append(" ");
stringBuilder.Append(level.ToString("g"));
stringBuilder.Append(" ");
stringBuilder.Append(message);
string item = stringBuilder.ToString();
lock (_lock) {
if (_traceMessages.Count >= 1000)
_traceMessages.Dequeue();
_traceMessages.Enqueue(item);
}
}
public IEnumerable<string> GetTraceMessages()
{
return _traceMessages;
}
public override string ToString()
{
lock (_lock) {
StringBuilder stringBuilder = new StringBuilder();
foreach (string traceMessage in _traceMessages) {
if (stringBuilder.Length > 0)
stringBuilder.AppendLine();
stringBuilder.Append(traceMessage);
}
return stringBuilder.ToString();
}
}
}
}