_NetworkingPerfCounters.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / _NetworkingPerfCounters.cs / 1305376 / _NetworkingPerfCounters.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net 
{ 
    using System;
    using System.Reflection; 
    using System.Net.Sockets;
    using System.Diagnostics;
    using System.Security.Permissions;
    using System.ComponentModel; 
    using System.Globalization;
    using System.Text; 
    using System.Runtime.Versioning; 
    using System.Threading;
    using System.Net.Configuration; 

    internal enum NetworkingPerfCounterName
    {
        SocketConnectionsEstablished = 0, // these enum values are used as index 
        SocketBytesReceived,
        SocketBytesSent, 
        SocketDatagramsReceived, 
        SocketDatagramsSent,
        HttpWebRequestCreated, 
        HttpWebRequestAvgLifeTime,
        HttpWebRequestAvgLifeTimeBase,
        HttpWebRequestQueued,
        HttpWebRequestAvgQueueTime, 
        HttpWebRequestAvgQueueTimeBase,
        HttpWebRequestAborted, 
        HttpWebRequestFailed 
    }
 
    internal sealed class NetworkingPerfCounters
    {

        private class CounterPair 
        {
            private PerformanceCounter instanceCounter; 
            private PerformanceCounter globalCounter; 

            public PerformanceCounter InstanceCounter 
            {
                get { return instanceCounter; }
            }
 
            public PerformanceCounter GlobalCounter
            { 
                get { return globalCounter; } 
            }
 
            public CounterPair(PerformanceCounter instanceCounter, PerformanceCounter globalCounter)
            {
                Debug.Assert(instanceCounter != null);
                Debug.Assert(globalCounter != null); 

                this.instanceCounter = instanceCounter; 
                this.globalCounter = globalCounter; 
            }
        } 

        private const int instanceNameMaxLength = 127;
        private const string categoryName = ".NET CLR Networking 4.0.0.0";
        private const string globalInstanceName = "_Global_"; 
        private static readonly string[] counterNames = {
                                                            "Connections Established", 
                                                            "Bytes Received", 
                                                            "Bytes Sent",
                                                            "Datagrams Received", 
                                                            "Datagrams Sent",
                                                            "HttpWebRequests Created/Sec",
                                                            "HttpWebRequests Average Lifetime",
                                                            "HttpWebRequests Average Lifetime Base", 
                                                            "HttpWebRequests Queued/Sec",
                                                            "HttpWebRequests Average Queue Time", 
                                                            "HttpWebRequests Average Queue Time Base", 
                                                            "HttpWebRequests Aborted/Sec",
                                                            "HttpWebRequests Failed/Sec", 
                                                        };

        private static NetworkingPerfCounters instance;
        private static object lockObject = new object(); 

        private volatile bool initDone; // keep this volatile to prevent load-load reordering 
        private bool initSuccessful; 
        private CounterPair[] counters;
        private bool enabled; 
        private volatile bool cleanupCalled;

        private NetworkingPerfCounters()
        { 
            enabled = SettingsSectionInternal.Section.PerformanceCountersEnabled;
        } 
 
        public static NetworkingPerfCounters Instance
        { 
            get
            {
                if (instance == null)
                { 
                    lock (lockObject)
                    { 
                        if (instance == null) 
                        {
                            CreateInstance(); 
                        }
                    }
                }
                return instance; 
            }
        } 
 
        public static long GetTimestamp()
        { 
            return Stopwatch.GetTimestamp();
        }

        public bool Enabled 
        {
            get { return enabled; } 
        } 

        public void Increment(NetworkingPerfCounterName perfCounter) 
        {
            Increment(perfCounter, 1);
        }
 
        public void Increment(NetworkingPerfCounterName perfCounter, long amount)
        { 
            if (CounterAvailable()) 
            {
                try 
                {
                    CounterPair cp = counters[(int)perfCounter];
                    Debug.Assert(cp != null);
                    cp.InstanceCounter.IncrementBy(amount); 
                    cp.GlobalCounter.IncrementBy(amount);
                } 
                // in case there is something wrong with the counter instance, just log and continue 
                catch (InvalidOperationException e)
                { 
                    if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters", "Increment", e);
                }
                catch (Win32Exception e)
                { 
                    if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters", "Increment", e);
                } 
            } 
        }
 
        public void Decrement(NetworkingPerfCounterName perfCounter)
        {
            Increment(perfCounter, -1);
        } 

        public void Decrement(NetworkingPerfCounterName perfCounter, long amount) 
        { 
            Increment(perfCounter, -amount);
        } 

        public void IncrementAverage(NetworkingPerfCounterName perfCounter, long startTimestamp)
        {
            if (CounterAvailable()) 
            {
                long stopTimestamp = GetTimestamp(); 
                int avgCounterIndex = (int)perfCounter; 
                Debug.Assert(avgCounterIndex + 1 < counters.Length);
 
                long duration = ((stopTimestamp - startTimestamp) * 1000) / Stopwatch.Frequency;
                Increment(perfCounter, duration);

                // base counter is always the next one (otherwise we wouldn't even be able to initialize the counters) 
                Increment(perfCounter + 1, 1);
            } 
        } 

        private void Initialize(object state) 
        {
            if (Logging.On) Logging.PrintInfo(Logging.Web, SR.GetString(SR.net_perfcounter_initialization_started));

            PerformanceCounterPermission perfCounterPermission = new PerformanceCounterPermission(PermissionState.Unrestricted); 
            perfCounterPermission.Assert();
            try 
            { 
                if (!PerformanceCounterCategory.Exists(categoryName))
                { 
                    // if the perf. counter category doesn't exist, just log this information and exit.
                    if (Logging.On) Logging.PrintError(Logging.Web, SR.GetString(SR.net_perfcounter_nocategory, categoryName));
                    return;
                } 

                string instanceName = GetInstanceName(); 
 
                Debug.Assert(counterNames.Length == Enum.GetValues(typeof(NetworkingPerfCounterName)).Length,
                    "The number of NetworkingPerfCounterName items must match the number of CounterNames"); 

                // create the counters, this will check for the right permissions (false)
                // means the counter is not readonly (it's read/write) and cache them while
                // we're under the Assert(), which will be reverted in the finally below. 
                counters = new CounterPair[counterNames.Length];
                for (int i = 0; i < counterNames.Length; i++) 
                { 
                    counters[i] = CreateCounterPair(counterNames[i], instanceName);
                } 

                AppDomain.CurrentDomain.DomainUnload += new EventHandler(UnloadEventHandler);
                AppDomain.CurrentDomain.ProcessExit += new EventHandler(ExitEventHandler);
                AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(ExceptionEventHandler); 

                initSuccessful = true; 
            } 
            catch (Win32Exception e)
            { 
                if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters", "Initialize", e);
                Cleanup();
                return;
            } 
            catch (InvalidOperationException e)
            { 
                if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters", "Initialize", e); 
                Cleanup();
                return; 
            }
            finally
            {
                PerformanceCounterPermission.RevertAssert(); 

                initDone = true; 
 
                if (Logging.On)
                { 
                    if (initSuccessful)
                    {
                        Logging.PrintInfo(Logging.Web, SR.GetString(SR.net_perfcounter_initialized_success));
                    } 
                    else
                    { 
                        Logging.PrintInfo(Logging.Web, SR.GetString(SR.net_perfcounter_initialized_error)); 
                    }
                } 
            }
        }

        private static void CreateInstance() 
        {
            instance = new NetworkingPerfCounters(); 
            if (instance.Enabled) 
            {
                // as recommended by the perf. counter team: initialize perf. counters in background thread 
                // since initialization may take a long time. Therefore we should not block.
                if (!ThreadPool.QueueUserWorkItem(instance.Initialize))
                {
                    if (Logging.On) Logging.PrintError(Logging.Web, SR.GetString(SR.net_perfcounter_cant_queue_workitem)); 
                }
            } 
        } 

        private static CounterPair CreateCounterPair(string counterName, string instanceName) 
        {
            // first create global counter. If it throws we don't create an instance counter. If creating
            // the instance counter throws, we don't need to cleanup the global counter (done by perf. counter
            // infrastructure) 

            // use this ctor for global counters: it makes sure the counter is actually initialized. If 
            // we would use the ctor without params, as for the instance counters, the global counter 
            // would not be initialized => only when we increment it the first time it gets initialized. But
            // at that point, we're no more under the permission assertion. 
            PerformanceCounter globalCounter = new PerformanceCounter(categoryName, counterName,
                globalInstanceName, false);

            // for instance counters we use the default ctor, since we also need to set the lifetime. The 
            // counter gets actually initialized when we set RawValue.
            PerformanceCounter instanceCounter = new PerformanceCounter(); 
            instanceCounter.CategoryName = categoryName; 
            instanceCounter.CounterName = counterName;
            instanceCounter.InstanceName = instanceName; 
            instanceCounter.InstanceLifetime = PerformanceCounterInstanceLifetime.Process;
            instanceCounter.ReadOnly = false;
            instanceCounter.RawValue = 0;
 
            return new CounterPair(instanceCounter, globalCounter);
        } 
 
        private void ExceptionEventHandler(object sender, UnhandledExceptionEventArgs e)
        { 
            if (e.IsTerminating)
            {
                Cleanup();
            } 
        }
 
        // Keep the UnloadEventHandler and ExitEventHandler methods separate in order to 
        // facilitate better debugging and crash troubleshooting during call stack analysis
        // of ProcessExit and DomainUnload events from the AppDomain. 

        private void UnloadEventHandler(object sender, EventArgs e)
        {
            Cleanup(); 
        }
 
        private void ExitEventHandler(object sender, EventArgs e) 
        {
            Cleanup(); 
        }

        // Need to check for Environment.HasShutdownStarted.  This flag is ONLY
        // set when the CLR is running the GC Finalize thread and thus it is invalid 
        // to access the static performanceCounter objects and their methods.
        private void Cleanup() 
        { 
            // In cases where Cleanup() gets called simultaneously on different threads,
            // we use the lock to make sure it gets executed only once. 
            lock (lockObject)
            {
                if (!cleanupCalled)
                { 
                    cleanupCalled = true;
 
                    // counters may be null if Initialize() throws before counters gets created 
                    if (counters != null)
                    { 
                        foreach (CounterPair cp in counters)
                        {
                            // cp != null check: if the loop creating the counters in Initialize() throws
                            // an excpetion, some CounterPairs may not be created yet, thus the null check below. 
                            if (!Environment.HasShutdownStarted && cp != null)
                            { 
                                try 
                                {
                                    cp.InstanceCounter.RemoveInstance(); 
                                }
                                // in case there is something wrong with the counter instance, just log.
                                catch (InvalidOperationException e)
                                { 
                                    if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters",
                                        "Cleanup", e); 
                                } 
                                catch (Win32Exception e)
                                { 
                                    if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters",
                                        "Cleanup", e);
                                }
                            } 
                        }
                    } 
 
                    // No need to clean up global counters.
                } 
            }
        }

        private static string GetInstanceName() 
        {
            string friendlyName = ReplaceInvalidChars(AppDomain.CurrentDomain.FriendlyName); 
            string postfix = VersioningHelper.MakeVersionSafeName(string.Empty, ResourceScope.Machine, 
                ResourceScope.AppDomain);
 
            string result = friendlyName + postfix;

            if (result.Length > instanceNameMaxLength)
            { 
                result = friendlyName.Substring(0, instanceNameMaxLength - postfix.Length) + postfix;
            } 
 
            return result;
        } 

        private static string ReplaceInvalidChars(string instanceName)
        {
            // map invalid characters as suggested by MSDN (see PerformanceCounter.InstanceName Property help) 

            StringBuilder result = new StringBuilder(instanceName); 
            for (int i = 0; i < result.Length; i++) 
            {
                switch (result[i]) 
                {
                    case '(':
                        result[i] = '[';
                        break; 
                    case ')':
                        result[i] = ']'; 
                        break; 
                    case '/':
                    case '\\': 
                    case '#':
                        result[i] = '_';
                        break;
                } 
            }
 
            return result.ToString(); 
        }
 
        private bool CounterAvailable()
        {
            // Checking cleanupCalled below is not really necessary, since incrementing an already released
            // PerformanceCounter object is allowed. But since there is no point in incrementing a released 
            // counter, we return false.
            // The only scenario where we increment a released counter is: Cleanup() is called after the 
            // cleanupCalled check below, but before the counter is incremented. 
            if (!enabled || cleanupCalled)
            { 
                return false;
            }

            if (initDone) 
            {
                return initSuccessful; 
            } 

            return false; 
        }
    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net 
{ 
    using System;
    using System.Reflection; 
    using System.Net.Sockets;
    using System.Diagnostics;
    using System.Security.Permissions;
    using System.ComponentModel; 
    using System.Globalization;
    using System.Text; 
    using System.Runtime.Versioning; 
    using System.Threading;
    using System.Net.Configuration; 

    internal enum NetworkingPerfCounterName
    {
        SocketConnectionsEstablished = 0, // these enum values are used as index 
        SocketBytesReceived,
        SocketBytesSent, 
        SocketDatagramsReceived, 
        SocketDatagramsSent,
        HttpWebRequestCreated, 
        HttpWebRequestAvgLifeTime,
        HttpWebRequestAvgLifeTimeBase,
        HttpWebRequestQueued,
        HttpWebRequestAvgQueueTime, 
        HttpWebRequestAvgQueueTimeBase,
        HttpWebRequestAborted, 
        HttpWebRequestFailed 
    }
 
    internal sealed class NetworkingPerfCounters
    {

        private class CounterPair 
        {
            private PerformanceCounter instanceCounter; 
            private PerformanceCounter globalCounter; 

            public PerformanceCounter InstanceCounter 
            {
                get { return instanceCounter; }
            }
 
            public PerformanceCounter GlobalCounter
            { 
                get { return globalCounter; } 
            }
 
            public CounterPair(PerformanceCounter instanceCounter, PerformanceCounter globalCounter)
            {
                Debug.Assert(instanceCounter != null);
                Debug.Assert(globalCounter != null); 

                this.instanceCounter = instanceCounter; 
                this.globalCounter = globalCounter; 
            }
        } 

        private const int instanceNameMaxLength = 127;
        private const string categoryName = ".NET CLR Networking 4.0.0.0";
        private const string globalInstanceName = "_Global_"; 
        private static readonly string[] counterNames = {
                                                            "Connections Established", 
                                                            "Bytes Received", 
                                                            "Bytes Sent",
                                                            "Datagrams Received", 
                                                            "Datagrams Sent",
                                                            "HttpWebRequests Created/Sec",
                                                            "HttpWebRequests Average Lifetime",
                                                            "HttpWebRequests Average Lifetime Base", 
                                                            "HttpWebRequests Queued/Sec",
                                                            "HttpWebRequests Average Queue Time", 
                                                            "HttpWebRequests Average Queue Time Base", 
                                                            "HttpWebRequests Aborted/Sec",
                                                            "HttpWebRequests Failed/Sec", 
                                                        };

        private static NetworkingPerfCounters instance;
        private static object lockObject = new object(); 

        private volatile bool initDone; // keep this volatile to prevent load-load reordering 
        private bool initSuccessful; 
        private CounterPair[] counters;
        private bool enabled; 
        private volatile bool cleanupCalled;

        private NetworkingPerfCounters()
        { 
            enabled = SettingsSectionInternal.Section.PerformanceCountersEnabled;
        } 
 
        public static NetworkingPerfCounters Instance
        { 
            get
            {
                if (instance == null)
                { 
                    lock (lockObject)
                    { 
                        if (instance == null) 
                        {
                            CreateInstance(); 
                        }
                    }
                }
                return instance; 
            }
        } 
 
        public static long GetTimestamp()
        { 
            return Stopwatch.GetTimestamp();
        }

        public bool Enabled 
        {
            get { return enabled; } 
        } 

        public void Increment(NetworkingPerfCounterName perfCounter) 
        {
            Increment(perfCounter, 1);
        }
 
        public void Increment(NetworkingPerfCounterName perfCounter, long amount)
        { 
            if (CounterAvailable()) 
            {
                try 
                {
                    CounterPair cp = counters[(int)perfCounter];
                    Debug.Assert(cp != null);
                    cp.InstanceCounter.IncrementBy(amount); 
                    cp.GlobalCounter.IncrementBy(amount);
                } 
                // in case there is something wrong with the counter instance, just log and continue 
                catch (InvalidOperationException e)
                { 
                    if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters", "Increment", e);
                }
                catch (Win32Exception e)
                { 
                    if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters", "Increment", e);
                } 
            } 
        }
 
        public void Decrement(NetworkingPerfCounterName perfCounter)
        {
            Increment(perfCounter, -1);
        } 

        public void Decrement(NetworkingPerfCounterName perfCounter, long amount) 
        { 
            Increment(perfCounter, -amount);
        } 

        public void IncrementAverage(NetworkingPerfCounterName perfCounter, long startTimestamp)
        {
            if (CounterAvailable()) 
            {
                long stopTimestamp = GetTimestamp(); 
                int avgCounterIndex = (int)perfCounter; 
                Debug.Assert(avgCounterIndex + 1 < counters.Length);
 
                long duration = ((stopTimestamp - startTimestamp) * 1000) / Stopwatch.Frequency;
                Increment(perfCounter, duration);

                // base counter is always the next one (otherwise we wouldn't even be able to initialize the counters) 
                Increment(perfCounter + 1, 1);
            } 
        } 

        private void Initialize(object state) 
        {
            if (Logging.On) Logging.PrintInfo(Logging.Web, SR.GetString(SR.net_perfcounter_initialization_started));

            PerformanceCounterPermission perfCounterPermission = new PerformanceCounterPermission(PermissionState.Unrestricted); 
            perfCounterPermission.Assert();
            try 
            { 
                if (!PerformanceCounterCategory.Exists(categoryName))
                { 
                    // if the perf. counter category doesn't exist, just log this information and exit.
                    if (Logging.On) Logging.PrintError(Logging.Web, SR.GetString(SR.net_perfcounter_nocategory, categoryName));
                    return;
                } 

                string instanceName = GetInstanceName(); 
 
                Debug.Assert(counterNames.Length == Enum.GetValues(typeof(NetworkingPerfCounterName)).Length,
                    "The number of NetworkingPerfCounterName items must match the number of CounterNames"); 

                // create the counters, this will check for the right permissions (false)
                // means the counter is not readonly (it's read/write) and cache them while
                // we're under the Assert(), which will be reverted in the finally below. 
                counters = new CounterPair[counterNames.Length];
                for (int i = 0; i < counterNames.Length; i++) 
                { 
                    counters[i] = CreateCounterPair(counterNames[i], instanceName);
                } 

                AppDomain.CurrentDomain.DomainUnload += new EventHandler(UnloadEventHandler);
                AppDomain.CurrentDomain.ProcessExit += new EventHandler(ExitEventHandler);
                AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(ExceptionEventHandler); 

                initSuccessful = true; 
            } 
            catch (Win32Exception e)
            { 
                if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters", "Initialize", e);
                Cleanup();
                return;
            } 
            catch (InvalidOperationException e)
            { 
                if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters", "Initialize", e); 
                Cleanup();
                return; 
            }
            finally
            {
                PerformanceCounterPermission.RevertAssert(); 

                initDone = true; 
 
                if (Logging.On)
                { 
                    if (initSuccessful)
                    {
                        Logging.PrintInfo(Logging.Web, SR.GetString(SR.net_perfcounter_initialized_success));
                    } 
                    else
                    { 
                        Logging.PrintInfo(Logging.Web, SR.GetString(SR.net_perfcounter_initialized_error)); 
                    }
                } 
            }
        }

        private static void CreateInstance() 
        {
            instance = new NetworkingPerfCounters(); 
            if (instance.Enabled) 
            {
                // as recommended by the perf. counter team: initialize perf. counters in background thread 
                // since initialization may take a long time. Therefore we should not block.
                if (!ThreadPool.QueueUserWorkItem(instance.Initialize))
                {
                    if (Logging.On) Logging.PrintError(Logging.Web, SR.GetString(SR.net_perfcounter_cant_queue_workitem)); 
                }
            } 
        } 

        private static CounterPair CreateCounterPair(string counterName, string instanceName) 
        {
            // first create global counter. If it throws we don't create an instance counter. If creating
            // the instance counter throws, we don't need to cleanup the global counter (done by perf. counter
            // infrastructure) 

            // use this ctor for global counters: it makes sure the counter is actually initialized. If 
            // we would use the ctor without params, as for the instance counters, the global counter 
            // would not be initialized => only when we increment it the first time it gets initialized. But
            // at that point, we're no more under the permission assertion. 
            PerformanceCounter globalCounter = new PerformanceCounter(categoryName, counterName,
                globalInstanceName, false);

            // for instance counters we use the default ctor, since we also need to set the lifetime. The 
            // counter gets actually initialized when we set RawValue.
            PerformanceCounter instanceCounter = new PerformanceCounter(); 
            instanceCounter.CategoryName = categoryName; 
            instanceCounter.CounterName = counterName;
            instanceCounter.InstanceName = instanceName; 
            instanceCounter.InstanceLifetime = PerformanceCounterInstanceLifetime.Process;
            instanceCounter.ReadOnly = false;
            instanceCounter.RawValue = 0;
 
            return new CounterPair(instanceCounter, globalCounter);
        } 
 
        private void ExceptionEventHandler(object sender, UnhandledExceptionEventArgs e)
        { 
            if (e.IsTerminating)
            {
                Cleanup();
            } 
        }
 
        // Keep the UnloadEventHandler and ExitEventHandler methods separate in order to 
        // facilitate better debugging and crash troubleshooting during call stack analysis
        // of ProcessExit and DomainUnload events from the AppDomain. 

        private void UnloadEventHandler(object sender, EventArgs e)
        {
            Cleanup(); 
        }
 
        private void ExitEventHandler(object sender, EventArgs e) 
        {
            Cleanup(); 
        }

        // Need to check for Environment.HasShutdownStarted.  This flag is ONLY
        // set when the CLR is running the GC Finalize thread and thus it is invalid 
        // to access the static performanceCounter objects and their methods.
        private void Cleanup() 
        { 
            // In cases where Cleanup() gets called simultaneously on different threads,
            // we use the lock to make sure it gets executed only once. 
            lock (lockObject)
            {
                if (!cleanupCalled)
                { 
                    cleanupCalled = true;
 
                    // counters may be null if Initialize() throws before counters gets created 
                    if (counters != null)
                    { 
                        foreach (CounterPair cp in counters)
                        {
                            // cp != null check: if the loop creating the counters in Initialize() throws
                            // an excpetion, some CounterPairs may not be created yet, thus the null check below. 
                            if (!Environment.HasShutdownStarted && cp != null)
                            { 
                                try 
                                {
                                    cp.InstanceCounter.RemoveInstance(); 
                                }
                                // in case there is something wrong with the counter instance, just log.
                                catch (InvalidOperationException e)
                                { 
                                    if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters",
                                        "Cleanup", e); 
                                } 
                                catch (Win32Exception e)
                                { 
                                    if (Logging.On) Logging.Exception(Logging.Web, "NetworkingPerfCounters",
                                        "Cleanup", e);
                                }
                            } 
                        }
                    } 
 
                    // No need to clean up global counters.
                } 
            }
        }

        private static string GetInstanceName() 
        {
            string friendlyName = ReplaceInvalidChars(AppDomain.CurrentDomain.FriendlyName); 
            string postfix = VersioningHelper.MakeVersionSafeName(string.Empty, ResourceScope.Machine, 
                ResourceScope.AppDomain);
 
            string result = friendlyName + postfix;

            if (result.Length > instanceNameMaxLength)
            { 
                result = friendlyName.Substring(0, instanceNameMaxLength - postfix.Length) + postfix;
            } 
 
            return result;
        } 

        private static string ReplaceInvalidChars(string instanceName)
        {
            // map invalid characters as suggested by MSDN (see PerformanceCounter.InstanceName Property help) 

            StringBuilder result = new StringBuilder(instanceName); 
            for (int i = 0; i < result.Length; i++) 
            {
                switch (result[i]) 
                {
                    case '(':
                        result[i] = '[';
                        break; 
                    case ')':
                        result[i] = ']'; 
                        break; 
                    case '/':
                    case '\\': 
                    case '#':
                        result[i] = '_';
                        break;
                } 
            }
 
            return result.ToString(); 
        }
 
        private bool CounterAvailable()
        {
            // Checking cleanupCalled below is not really necessary, since incrementing an already released
            // PerformanceCounter object is allowed. But since there is no point in incrementing a released 
            // counter, we return false.
            // The only scenario where we increment a released counter is: Cleanup() is called after the 
            // cleanupCalled check below, but before the counter is incremented. 
            if (!enabled || cleanupCalled)
            { 
                return false;
            }

            if (initDone) 
            {
                return initSuccessful; 
            } 

            return false; 
        }
    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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