JD2022-TU1/main/tools/framework/JD.LogService/Loggers/TextWriterLogger.cs

using System;
using System.IO;
using JD.Kernel.Classes;
using JD.Kernel.StaticHelpers;

namespace JD.LogService.Loggers
{
    public class TextWriterLogger : AbstractDisposable, ILogger
    {
        #region Variables

        private TextWriter m_textWriter;
        private Converter<LogEvent, string> m_formatter = DefaultFormat;
        private bool m_immediateFlush = true;

        #endregion

        #region Constructor / Dispose

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                Reset();
            }

            base.Dispose(disposing);
        }

        #endregion

        #region Properties

        /// <summary>
        /// The writer used to write events.
        /// </summary>
        public TextWriter TextWriter
        {
            get { return m_textWriter; }
            set
            {
                if (m_textWriter != value)
                {
                    DisposeTextWriter();
                    m_textWriter = value;
                }
            }
        }

        /// <summary>
        /// Formatter used to render log events.
        /// </summary>
        public Converter<LogEvent, string> Formatter
        {
            get { return m_formatter; }
            set
            {
                Throw.IfNull(value, "Formatter");
                m_formatter = value;
            }
        }

        /// <summary>
        /// Whether to flush data after writing. True by default.
        /// </summary>
        public bool ImmediateFlush
        {
            get { return m_immediateFlush; }
            set { m_immediateFlush = value; }
        }

        #endregion

        #region Methods

        public virtual void Log(LogEvent @event)
        {
            WriteLine(m_formatter(@event));

            if (ImmediateFlush)
            {
                m_textWriter.Flush();
            }
        }

        protected virtual void WriteLine(string line)
        {
            m_textWriter.WriteLine(line);
        }

        protected virtual void Reset()
        {
            DisposeTextWriter();
        }

        private void DisposeTextWriter()
        {
            if (m_textWriter != null)
            {
                m_textWriter.Close();
                m_textWriter = null;
            }
        }

        private static string DefaultFormat(LogEvent @event)
        {
            return $"{@event.Timestamp:dd/MM/yy HH:mm:ss} : {@event.ToCanonicalString()}";
        }

        #endregion
    }
}