log.cs source code in C# .NET

Source code for the .NET framework in C#



/ DotNET / DotNET / 8.0 / 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.
    [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. 
    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. 
        [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)

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


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