loggerとは？ わかりやすく解説

Public MustInherit Class
 Logger
    Implements ILogger

Dim instance As Logger

public abstract class Logger : ILogger

public ref class Logger abstract : ILogger

public abstract class Logger implements ILogger

public abstract class Logger implements ILogger

using System;
using System.IO;
using System.Security;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;

namespace MyLoggers
{
    // This logger will derive from the Microsoft.Build.Utilities.Logger
 class,
    // which provides it with getters and setters for Verbosity and
 Parameters,
    // and a default empty Shutdown() implementation.
    public class BasicFileLogger : Logger
    {
        /// <summary>
        /// Initialize is guaranteed to be called by MSBuild at the
 start of the build
        /// before any events are raised.
        /// </summary>
        public override void Initialize(IEventSource
 eventSource)
        {
            // The name of the log file should be passed as the first
 item in the
            // "parameters" specification in the /logger switch.
  It is required
            // to pass a log file to this logger. Other loggers may
 have zero or more than 
            // one parameters.
            if (null == Parameters)
            {
                throw new LoggerException("Log file was not
 set.");
            }
            string[] parameters = Parameters.Split(';');
            
            string logFile = parameters[0];
            if (String.IsNullOrEmpty(logFile))
            {
                throw new LoggerException("Log file was not
 set.");
            }
            
            if (parameters.Length > 1)
            {
                throw new LoggerException("Too many parameters
 passed.");
            }
            
            try
            {
                // Open the file
                this.streamWriter = new StreamWriter(logFile);
            }
            catch (Exception ex)
            {
                if
                (
                    ex is UnauthorizedAccessException
                    || ex is ArgumentNullException
                    || ex is PathTooLongException
                    || ex is DirectoryNotFoundException
                    || ex is NotSupportedException
                    || ex is ArgumentException
                    || ex is SecurityException
                    || ex is IOException
                )
                {
                    throw new LoggerException("Failed to
 create log file: " + ex.Message);
                }
                else
                {
                    // Unexpected failure
                    throw;
                }
            }

            // For brevity, we'll only register for certain event types.
 Loggers can also
            // register to handle TargetStarted/Finished and other events.
            eventSource.ProjectStarted += new ProjectStartedEventHandler(eventSource_ProjectStarted);
            eventSource.TaskStarted += new TaskStartedEventHandler(eventSource_TaskStarted);
            eventSource.MessageRaised += new BuildMessageEventHandler(eventSource_MessageRaised);
            eventSource.WarningRaised += new BuildWarningEventHandler(eventSource_WarningRaised);
            eventSource.ErrorRaised += new BuildErrorEventHandler(eventSource_ErrorRaised);
            eventSource.ProjectFinished += new ProjectFinishedEventHandler(eventSource_ProjectFinished);
        }

        void eventSource_ErrorRaised(object sender, BuildErrorEventArgs
 e)
        {
            // BuildErrorEventArgs adds LineNumber, ColumnNumber, File,
 amongst other parameters
            string line = String.Format(": ERROR {0}({1},{2}):
 ", e.File, e.LineNumber, e.ColumnNumber);
            WriteLineWithSenderAndMessage(line, e);
        }
        
        void eventSource_WarningRaised(object sender, BuildWarningEventArgs
 e)
        {
            // BuildWarningEventArgs adds LineNumber, ColumnNumber,
 File, amongst other parameters
            string line = String.Format(": Warning {0}({1},{2}):
 ", e.File, e.LineNumber, e.ColumnNumber);
            WriteLineWithSenderAndMessage(line, e);
        }

        void eventSource_MessageRaised(object sender, BuildMessageEventArgs
 e)
        {
            // BuildMessageEventArgs adds Importance to BuildEventArgs
            // Let's take account of the verbosity setting we've been
 passed in deciding whether to log the message
            if ((e.Importance == MessageImportance.High &&
 IsVerbosityAtLeast(LoggerVerbosity.Minimal))
                || (e.Importance == MessageImportance.Normal && IsVerbosityAtLeast(LoggerVerbosity.Normal))
                || (e.Importance == MessageImportance.Low && IsVerbosityAtLeast(LoggerVerbosity.Detailed))
                
                )
            {
                WriteLineWithSenderAndMessage(String.Empty, e);
            }
        }

        void eventSource_TaskStarted(object sender, TaskStartedEventArgs
 e)
        {
            // TaskStartedEventArgs adds ProjectFile, TaskFile, TaskName
            // To keep this log clean, this logger will ignore these
 events.
        }
        
        void eventSource_ProjectStarted(object sender, ProjectStartedEventArgs
 e)
        {
            // ProjectStartedEventArgs adds ProjectFile, TargetNames
            // Just the regular message string is good enough here,
 so just display that.
            WriteLine(String.Empty, e);
            indent++;
        }

        void eventSource_ProjectFinished(object sender, ProjectFinishedEventArgs
 e)
        {
            // The regular message string is good enough here too.
            indent--;
            WriteLine(String.Empty, e);
        }
        
        /// <summary>
        /// Write a line to the log, adding the SenderName and Message
        /// (these parameters are on all MSBuild event argument objects)
        /// </summary>
        private void WriteLineWithSenderAndMessage(string
 line, BuildEventArgs e)
        {
            if (0 == String.Compare(e.SenderName, "MSBuild",
 true /*ignore case*/))
            {
                // Well, if the sender name is MSBuild, let's leave
 it out for prettiness
                WriteLine(line, e);
            }
            else
            {
                WriteLine(e.SenderName + ": " + line, e);
            }
        }
        
        /// <summary>
        /// Just write a line to the log
        /// </summary>
        private void WriteLine(string
 line, BuildEventArgs e)
        {
            for (int i = indent; i > 0;
 i--)
            {
                streamWriter.Write("\t");
            }
            streamWriter.WriteLine(line + e.Message);
        }
        
        /// <summary>
        /// Shutdown() is guaranteed to be called by MSBuild at the
 end of the build, after all 
        /// events have been raised.
        /// </summary>
        public override void Shutdown()
        {
            // Done logging, let go of the file
            streamWriter.Close();
        }

        private StreamWriter streamWriter;
        private int indent;
    }
}

Protected Sub New

Dim instance As New Logger

protected Logger ()

protected:
Logger ()

protected Logger ()

protected function Logger ()