PerfCounters.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / PerfCounters.cs / 1 / PerfCounters.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * PerfCounters class 
 */
namespace System.Web { 

    using System.Web.Util;
    using System.Threading;
    using System.Runtime.InteropServices; 

    internal sealed class PerfInstanceDataHandle: SafeHandle { 
        internal PerfInstanceDataHandle() : base(IntPtr.Zero, true) { 
        }
 
        internal IntPtr UnsafeHandle {
            get { return handle; }
        }
 
        public override bool IsInvalid {
            get { return handle == IntPtr.Zero; } 
        } 

        override protected bool ReleaseHandle() { 
            UnsafeNativeMethods.PerfCloseAppCounters(handle);
            handle = IntPtr.Zero;
            return true;
        } 
    }
 
    internal sealed class PerfCounters { 

        private static PerfInstanceDataHandle _instance = null; 
        private static IntPtr _global = IntPtr.Zero;
        private static IntPtr _stateService = IntPtr.Zero;

        private PerfCounters () {} 

        internal static void Open(string appName) { 
            Debug.Assert(appName != null); 

            OpenCounter(appName); 
        }

        internal static void OpenStateCounters() {
            OpenCounter(null); 
        }
 
 
        // The app name should either be a valid app name or be 'null' to get the state service
        // counters initialized 
        private static void OpenCounter(string appName) {
            try {
                // Don't activate perf counters if webengine.dll isn't loaded
                if (! HttpRuntime.IsEngineLoaded) 
                    return;
 
                // Open the global counters 
                if (_global == IntPtr.Zero) {
                    _global = UnsafeNativeMethods.PerfOpenGlobalCounters(); 
                }

                // If appName is null, then we want the state counters
                if (appName == null) { 
                    if (_stateService == IntPtr.Zero) {
                        _stateService = UnsafeNativeMethods.PerfOpenStateCounters(); 
                    } 
                }
                else { 
                    if (appName != null) {
                        _instance = UnsafeNativeMethods.PerfOpenAppCounters(appName);
                    }
                } 
            }
            catch (Exception e) { 
                Debug.Trace("Perfcounters", "Exception: " + e.StackTrace); 
            }
        } 

        // Make sure webengine.dll is loaded before attempting to call into it (ASURT 98531)

        internal static void IncrementCounter(AppPerfCounter counter) { 
            if (_instance != null)
                UnsafeNativeMethods.PerfIncrementCounter(_instance.UnsafeHandle, (int) counter); 
        } 

        internal static void DecrementCounter(AppPerfCounter counter) { 
            if (_instance != null)
                UnsafeNativeMethods.PerfDecrementCounter(_instance.UnsafeHandle, (int) counter);
        }
 
        internal static void IncrementCounterEx(AppPerfCounter counter, int delta) {
            if (_instance != null) 
                UnsafeNativeMethods.PerfIncrementCounterEx(_instance.UnsafeHandle, (int) counter, delta); 
        }
 
        internal static void SetCounter(AppPerfCounter counter, int value) {
            if (_instance != null)
                UnsafeNativeMethods.PerfSetCounter(_instance.UnsafeHandle, (int) counter, value);
        } 

        // It's important that this be debug only. We don't want production 
        // code to access shared memory that another process could corrupt. 
#if DBG
        internal static int GetCounter(AppPerfCounter counter) { 
            if (_instance != null)
                return UnsafeNativeMethods.PerfGetCounter(_instance.UnsafeHandle, (int) counter);
            else
                return -1; 
        }
#endif 
 
        internal static int GetGlobalCounter(GlobalPerfCounter counter) {
            if (_global != IntPtr.Zero) 
                return UnsafeNativeMethods.PerfGetCounter(_global, (int) counter);
            else
                return -1;
        } 

        internal static void IncrementGlobalCounter(GlobalPerfCounter counter) { 
            if (_global != IntPtr.Zero) 
                UnsafeNativeMethods.PerfIncrementCounter(_global, (int) counter);
        } 

        internal static void DecrementGlobalCounter(GlobalPerfCounter counter) {
            if (_global != IntPtr.Zero)
                UnsafeNativeMethods.PerfDecrementCounter(_global, (int) counter); 
        }
 
#if UNUSED_CODE 
        internal static void IncrementGlobalCounterEx(GlobalPerfCounter counter, int delta) {
            if (_global != IntPtr.Zero) 
                UnsafeNativeMethods.PerfIncrementCounterEx(_global, (int) counter, delta);
        }
#endif
        internal static void SetGlobalCounter(GlobalPerfCounter counter, int value) { 
            if (_global != IntPtr.Zero)
                UnsafeNativeMethods.PerfSetCounter(_global, (int) counter, value); 
        } 

        internal static void IncrementStateServiceCounter(StateServicePerfCounter counter) { 
            if (_stateService == IntPtr.Zero)
                return;
            UnsafeNativeMethods.PerfIncrementCounter(_stateService, (int) counter);
 
            switch (counter) {
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_TOTAL: 
                    IncrementGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_TOTAL); 
                    break;
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_ACTIVE: 
                    IncrementGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_ACTIVE);
                    break;
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_TIMED_OUT:
                    IncrementGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_TIMED_OUT); 
                    break;
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_ABANDONED: 
                    IncrementGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_ABANDONED); 
                    break;
                default: 
                    break;
            }
        }
 
        internal static void DecrementStateServiceCounter(StateServicePerfCounter counter) {
            if (_stateService == IntPtr.Zero) 
                return; 
            UnsafeNativeMethods.PerfDecrementCounter(_stateService, (int) counter);
 
            switch (counter) {
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_TOTAL:
                    DecrementGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_TOTAL);
                    break; 
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_ACTIVE:
                    DecrementGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_ACTIVE); 
                    break; 
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_TIMED_OUT:
                    DecrementGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_TIMED_OUT); 
                    break;
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_ABANDONED:
                    DecrementGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_ABANDONED);
                    break; 
                default:
                    break; 
            } 
        }
 
#if UNUSED_CODE
        internal static void IncrementStateServiceCounterEx(StateServicePerfCounter counter, int delta) {
            if (_stateService == IntPtr.Zero)
                return; 
            UnsafeNativeMethods.PerfIncrementCounterEx(_stateService, (int) counter, delta);
 
            switch (counter) { 
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_TOTAL:
                    IncrementGlobalCounterEx(GlobalPerfCounter.STATE_SERVER_SESSIONS_TOTAL, delta); 
                    break;
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_ACTIVE:
                    IncrementGlobalCounterEx(GlobalPerfCounter.STATE_SERVER_SESSIONS_ACTIVE, delta);
                    break; 
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_TIMED_OUT:
                    IncrementGlobalCounterEx(GlobalPerfCounter.STATE_SERVER_SESSIONS_TIMED_OUT, delta); 
                    break; 
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_ABANDONED:
                    IncrementGlobalCounterEx(GlobalPerfCounter.STATE_SERVER_SESSIONS_ABANDONED, delta); 
                    break;
                default:
                    break;
            } 
        }
#endif 
 
        internal static void SetStateServiceCounter(StateServicePerfCounter counter, int value) {
            if (_stateService == IntPtr.Zero) 
                return;
            UnsafeNativeMethods.PerfSetCounter(_stateService, (int) counter, value);

            switch (counter) { 
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_TOTAL:
                    SetGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_TOTAL, value); 
                    break; 
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_ACTIVE:
                    SetGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_ACTIVE, value); 
                    break;
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_TIMED_OUT:
                    SetGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_TIMED_OUT, value);
                    break; 
                case StateServicePerfCounter.STATE_SERVICE_SESSIONS_ABANDONED:
                    SetGlobalCounter(GlobalPerfCounter.STATE_SERVER_SESSIONS_ABANDONED, value); 
                    break; 
                default:
                    break; 
            }
        }
    };
 
}
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