log.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Diagnostics / log.cs / 1 / log.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
namespace System.Diagnostics {
 	using System.Runtime.Remoting; 
	using System; 
    using System.Security.Permissions;
	using System.IO; 
	using System.Collections;
 	using System.Runtime.CompilerServices;
    using Encoding = System.Text.Encoding;
    using System.Runtime.Versioning; 

   // LogMessageEventHandlers are triggered when a message is generated which is 
   // "on" per its switch. 
   //
   // By default, the debugger (if attached) is the only event handler. 
   // There is also a "built-in" console device which can be enabled
   // programatically, by registry (specifics....) or environment
   // variables.
	[Serializable()] 
    [HostProtection(Synchronization=true, ExternalThreading=true)]
    internal delegate void LogMessageEventHandler(LoggingLevels level, LogSwitch category, 
    												String message, 
    												StackTrace location);
 

   // LogSwitchLevelHandlers are triggered when the level of a LogSwitch is modified
   // NOTE: These are NOT triggered when the log switch setting is changed from the
   // attached debugger. 
   //
 	[Serializable()] 
    internal delegate void LogSwitchLevelHandler(LogSwitch ls, LoggingLevels newLevel); 

 
    internal static class Log
    {

    	// Switches allow relatively fine level control of which messages are 
    	// actually shown.  Normally most debugging messages are not shown - the
    	// user will typically enable those which are relevant to what is being 
    	// investigated. 
    	//
    	// An attached debugger can enable or disable which messages will 
    	// actually be reported to the user through the COM+ debugger
    	// services API.  This info is communicated to the runtime so only
    	// desired events are actually reported to the debugger.
    	internal static Hashtable m_Hashtable; 
    	private static bool m_fConsoleDeviceEnabled;
    	private static Stream[] m_rgStream; 
    	private static int m_iNumOfStreamDevices; 
    	private static int m_iStreamArraySize;
    	//private static StreamWriter pConsole; 
    	internal static int iNumOfSwitches;
    	//private static int iNumOfMsgHandlers;
    	//private static int iMsgHandlerArraySize;
        private static LogMessageEventHandler   _LogMessageEventHandler; 
        private static LogSwitchLevelHandler   _LogSwitchLevelHandler;
        private static Object locker; 
 
    	// Constant representing the global switch
    	public static readonly LogSwitch GlobalSwitch; 


    	static Log()
    	{ 
    		m_Hashtable = new Hashtable();
    		m_fConsoleDeviceEnabled = false; 
    		m_rgStream = null; 
    		m_iNumOfStreamDevices = 0;
    		m_iStreamArraySize = 0; 
    		//pConsole = null;
    		//iNumOfMsgHandlers = 0;
    		//iMsgHandlerArraySize = 0;
            locker = new Object(); 

    		// allocate the GlobalSwitch object 
    		GlobalSwitch = new LogSwitch ("Global", "Global Switch for this log"); 

    		GlobalSwitch.MinimumLevel = LoggingLevels.ErrorLevel; 
    	}

    	public static void AddOnLogMessage(LogMessageEventHandler handler)
    	{ 
            lock (locker)
                _LogMessageEventHandler = 
                    (LogMessageEventHandler) MulticastDelegate.Combine(_LogMessageEventHandler, handler); 
    	}
 
    	public static void RemoveOnLogMessage(LogMessageEventHandler handler)
    	{

            lock (locker) 
                _LogMessageEventHandler =
                    (LogMessageEventHandler) MulticastDelegate.Remove(_LogMessageEventHandler, handler); 
    	} 

    	public static void AddOnLogSwitchLevel(LogSwitchLevelHandler handler) 
    	{
            lock (locker)
                _LogSwitchLevelHandler =
                    (LogSwitchLevelHandler) MulticastDelegate.Combine(_LogSwitchLevelHandler, handler); 
    	}
 
    	public static void RemoveOnLogSwitchLevel(LogSwitchLevelHandler handler) 
    	{
            lock (locker) 
                _LogSwitchLevelHandler =
                    (LogSwitchLevelHandler) MulticastDelegate.Remove(_LogSwitchLevelHandler, handler);
    	}
 
    	internal static void InvokeLogSwitchLevelHandlers (LogSwitch ls, LoggingLevels newLevel)
    	{ 
            LogSwitchLevelHandler handler = _LogSwitchLevelHandler; 
    		if (handler != null)
    			handler(ls, newLevel); 
    	}


        // Property to Enable/Disable ConsoleDevice. Enabling the console device 
        // adds the console device as a log output, causing any
        // log messages which make it through filters to be written to the 
        // application console.  The console device is enabled by default if the 
        // ??? registry entry or ??? environment variable is set.
        public static bool IsConsoleEnabled 
        {
            get { return m_fConsoleDeviceEnabled; }
            set { m_fConsoleDeviceEnabled = value; }
        } 

    	// AddStream uses the given stream to create and add a new log 
    	// device.  Any log messages which make it through filters will be written 
    	// to the stream.
    	// 
    	public static void AddStream(Stream stream)
    	{
    		if (stream==null)
    			throw new ArgumentNullException("stream"); 
    		if (m_iStreamArraySize <= m_iNumOfStreamDevices)
    		{ 
    				// increase array size in chunks of 4 
    				Stream[] newArray = new Stream [m_iStreamArraySize+4];
 
    				// copy the old array objects into the new one.
    	            if (m_iNumOfStreamDevices > 0)
    					Array.Copy(m_rgStream, newArray, m_iNumOfStreamDevices);
 
    				m_iStreamArraySize += 4;
 
    		        m_rgStream = newArray; 
    		}
 
    		m_rgStream [m_iNumOfStreamDevices++] = stream;
    	}

 
    	// Generates a log message. If its switch (or a parent switch) allows the
    	// level for the message, it is "broadcast" to all of the log 
    	// devices. 
    	//
    	public static void LogMessage(LoggingLevels level, String message) 
    	{
    		LogMessage (level, GlobalSwitch, message);
    	}
 
    	// Generates a log message. If its switch (or a parent switch) allows the
    	// level for the message, it is "broadcast" to all of the log 
    	// devices. 
    	//
        [ResourceExposure(ResourceScope.None)] 
        [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)]
    	public static void LogMessage(LoggingLevels level, LogSwitch logswitch, String message)
    	{
    		if (logswitch == null) 
    			throw new ArgumentNullException ("LogSwitch");
 
    		if (level < 0) 
    			throw new ArgumentOutOfRangeException("level", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
 
    		// Is logging for this level for this switch enabled?
    		if (logswitch.CheckLevel (level) == true)
    		{
    			// Send message for logging 
    			
    			// first send it to the debugger 
    			Debugger.Log ((int) level, logswitch.strName, message); 

    			// Send to the console device 
    			if (m_fConsoleDeviceEnabled)
    			{
    				Console.Write(message);				
    			} 

    			// Send it to the streams 
    			for (int i=0; i

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