PerformanceCounterCategory.cs source code in C# .NET

                        
Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Services / Monitoring / system / Diagnosticts / PerformanceCounterCategory.cs / 1 / PerformanceCounterCategory.cs
                        

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

namespace System.Diagnostics { 
    using System.Runtime.Serialization.Formatters; 
    using System.ComponentModel;
    using System.Diagnostics; 
    using System;
    using System.Threading;
    using System.Security;
    using System.Security.Permissions; 
    using System.Collections;
    using Microsoft.Win32; 
    using System.Globalization; 
    using System.Runtime.CompilerServices;
 
    /// 
    ///     A Performance counter category object.
    /// 
    [ 
    HostProtection(Synchronization=true, SharedState=true)
    ] 
    public sealed class PerformanceCounterCategory { 
        private string categoryName;
        private string categoryHelp; 
        private string machineName;
        internal const int MaxNameLength = 80;
        internal const int MaxHelpLength = 255;
        private const string perfMutexName = "netfxperf.1.0"; 

        ///  
        ///    [To be supplied.] 
        /// 
        public PerformanceCounterCategory() { 
            machineName = ".";
        }

        ///  
        ///     Creates a PerformanceCounterCategory object for given category.
        ///     Uses the local machine. 
        ///  
        public PerformanceCounterCategory(string categoryName)
            : this(categoryName, ".") { 
        }

        /// 
        ///     Creates a PerformanceCounterCategory object for given category. 
        ///     Uses the given machine name.
        ///  
        public PerformanceCounterCategory(string categoryName, string machineName) { 
            if (categoryName == null)
                throw new ArgumentNullException("categoryName"); 

            if (categoryName.Length == 0)
                throw new ArgumentException(SR.GetString(SR.InvalidParameter, "categoryName", categoryName));
 
            if (!SyntaxCheck.CheckMachineName(machineName))
                throw new ArgumentException(SR.GetString(SR.InvalidParameter, "machineName", machineName)); 
 
            PerformanceCounterPermission permission = new PerformanceCounterPermission(PerformanceCounterPermissionAccess.Read, machineName, categoryName);
            permission.Demand(); 

            this.categoryName = categoryName;
            this.machineName = machineName;
         } 

        ///  
        ///     Gets/sets the Category name 
        /// 
        public string CategoryName { 
            get {
                return categoryName;
            }
 
            set {
                if (value == null) 
                    throw new ArgumentNullException("value"); 

                if (value.Length == 0) 
                    throw new ArgumentException(SR.GetString(SR.InvalidProperty, "CategoryName", value));

                // there lock prevents a race between setting CategoryName and MachineName, since this permission
                // checks depend on both pieces of info. 
                lock (this) {
                    PerformanceCounterPermission permission = new PerformanceCounterPermission(PerformanceCounterPermissionAccess.Read, machineName, value); 
                    permission.Demand(); 

                    this.categoryName = value; 
                }
            }
        }
 
        /// 
        ///     Gets/sets the Category help 
        ///  
        public string CategoryHelp {
            get { 
                if (this.categoryName == null)
                    throw new InvalidOperationException(SR.GetString(SR.CategoryNameNotSet));

                if (categoryHelp == null) 
                    categoryHelp = PerformanceCounterLib.GetCategoryHelp(this.machineName, this.categoryName);
 
                return categoryHelp; 
            }
        } 

        public PerformanceCounterCategoryType CategoryType{
            get {
                CategorySample categorySample = PerformanceCounterLib.GetCategorySample(machineName, categoryName); 

                // If we get MultiInstance, we can be confident it is correct.  If it is single instance, though 
                // we need to check if is a custom category and if the IsMultiInstance value is set in the registry. 
                // If not we return Unknown
                if (categorySample.IsMultiInstance) 
                    return PerformanceCounterCategoryType.MultiInstance;
                else {
                    if (PerformanceCounterLib.IsCustomCategory(".", categoryName))
                        return PerformanceCounterLib.GetCategoryType(".", categoryName); 
                    else
                        return PerformanceCounterCategoryType.SingleInstance; 
                } 
            }
        } 


        /// 
        ///     Gets/sets the Machine name 
        /// 
        public string MachineName { 
            get { 
                return machineName;
            } 
            set {
                if (!SyntaxCheck.CheckMachineName(value))
                    throw new ArgumentException(SR.GetString(SR.InvalidProperty, "MachineName", value));
 
                // there lock prevents a race between setting CategoryName and MachineName, since this permission
                // checks depend on both pieces of info. 
                lock (this) { 
                    if (categoryName != null) {
                        PerformanceCounterPermission permission = new PerformanceCounterPermission(PerformanceCounterPermissionAccess.Read, value, categoryName); 
                        permission.Demand();
                    }

                    machineName = value; 
                }
            } 
        } 

        ///  
        ///     Returns true if the counter is registered for this category
        /// 
        public bool CounterExists(string counterName) {
            if (counterName == null) 
                throw new ArgumentNullException("counterName");
 
            if (this.categoryName == null) 
                    throw new InvalidOperationException(SR.GetString(SR.CategoryNameNotSet));
 
            return PerformanceCounterLib.CounterExists(machineName, categoryName, counterName);
        }

        ///  
        ///     Returns true if the counter is registered for this category on the current machine.
        ///  
        public static bool CounterExists(string counterName, string categoryName) { 
            return CounterExists(counterName, categoryName, ".");
        } 

        /// 
        ///     Returns true if the counter is registered for this category on a particular machine.
        ///  
        public static bool CounterExists(string counterName, string categoryName, string machineName) {
            if (counterName == null) 
                throw new ArgumentNullException("counterName"); 

            if (categoryName == null) 
                throw new ArgumentNullException("categoryName");

            if (categoryName.Length == 0)
                throw new ArgumentException(SR.GetString(SR.InvalidParameter, "categoryName", categoryName)); 

            if (!SyntaxCheck.CheckMachineName(machineName)) 
                throw new ArgumentException(SR.GetString(SR.InvalidParameter, "machineName", machineName)); 

            PerformanceCounterPermission permission = new PerformanceCounterPermission(PerformanceCounterPermissionAccess.Read,  machineName, categoryName); 
            permission.Demand();

            return PerformanceCounterLib.CounterExists(machineName, categoryName, counterName);
         } 

        ///  
        ///     Registers one extensible performance category of type NumberOfItems32 with the system 
        /// 
        [Obsolete("This method has been deprecated.  Please use System.Diagnostics.PerformanceCounterCategory.Create(string categoryName, string categoryHelp, PerformanceCounterCategoryType categoryType, string counterName, string counterHelp) instead.  http://go.microsoft.com/fwlink/?linkid=14202")] 
        public static PerformanceCounterCategory Create(string categoryName, string categoryHelp, string counterName, string counterHelp) {
            CounterCreationData customData = new CounterCreationData(counterName, counterHelp, PerformanceCounterType.NumberOfItems32);
            return Create(categoryName, categoryHelp, PerformanceCounterCategoryType.Unknown, new CounterCreationDataCollection(new CounterCreationData [] {customData}));
        } 

        public static PerformanceCounterCategory Create(string categoryName, string categoryHelp, PerformanceCounterCategoryType categoryType, string counterName, string counterHelp) { 
            CounterCreationData customData = new CounterCreationData(counterName, counterHelp, PerformanceCounterType.NumberOfItems32); 
            return Create(categoryName, categoryHelp, categoryType, new CounterCreationDataCollection(new CounterCreationData [] {customData}));
        } 

        /// 
        ///     Registers the extensible performance category with the system on the local machine
        ///  
        [Obsolete("This method has been deprecated.  Please use System.Diagnostics.PerformanceCounterCategory.Create(string categoryName, string categoryHelp, PerformanceCounterCategoryType categoryType, CounterCreationDataCollection counterData) instead.  http://go.microsoft.com/fwlink/?linkid=14202")]
        public static PerformanceCounterCategory Create(string categoryName, string categoryHelp, CounterCreationDataCollection counterData) { 
            return Create(categoryName, categoryHelp, PerformanceCounterCategoryType.Unknown, counterData); 
        }
 
        public static PerformanceCounterCategory Create(string categoryName, string categoryHelp, PerformanceCounterCategoryType categoryType, CounterCreationDataCollection counterData) {
            if (categoryType < PerformanceCounterCategoryType.Unknown || categoryType > PerformanceCounterCategoryType.MultiInstance)
                throw new ArgumentOutOfRangeException("categoryType");
            if (counterData == null) 
                throw new ArgumentNullException("counterData");
 
            CheckValidCategory(categoryName); 
            string machineName = ".";
 
            PerformanceCounterPermission permission = new PerformanceCounterPermission(PerformanceCounterPermissionAccess.Administer,  machineName, categoryName);
            permission.Demand();

            SharedUtils.CheckNtEnvironment(); 

            Mutex mutex = null; 
            RuntimeHelpers.PrepareConstrainedRegions(); 
            try {
                SharedUtils.EnterMutex(perfMutexName, ref mutex); 
                if (PerformanceCounterLib.IsCustomCategory(machineName, categoryName) || PerformanceCounterLib.CategoryExists(machineName , categoryName))
                    throw new InvalidOperationException(SR.GetString(SR.PerformanceCategoryExists, categoryName));

                CheckValidCounterLayout(counterData); 
                PerformanceCounterLib.RegisterCategory(categoryName, categoryType, categoryHelp, counterData);
                return new PerformanceCounterCategory(categoryName, machineName); 
            } 
            finally {
                if (mutex != null) { 
                    mutex.ReleaseMutex();
                    mutex.Close();
                }
            } 
        }
 
        // there is an idential copy of CheckValidCategory in PerformnaceCounterInstaller 
        internal static void CheckValidCategory(string categoryName) {
            if (categoryName == null) 
                throw new ArgumentNullException("categoryName");

            if (!CheckValidId(categoryName))
                throw new ArgumentException(SR.GetString(SR.PerfInvalidCategoryName, 1, MaxNameLength)); 

            // 1026 chars is the size of the buffer used in perfcounter.dll to get this name. 
            // If the categoryname plus prefix is too long, we won't be able to read the category properly. 
            if (categoryName.Length > (1024 - SharedPerformanceCounter.DefaultFileMappingName.Length))
                throw new ArgumentException(SR.GetString(SR.CategoryNameTooLong)); 
        }

        internal static void CheckValidCounter(string counterName) {
            if (counterName == null) 
                throw new ArgumentNullException("counterName");
 
            if (!CheckValidId(counterName)) 
                throw new ArgumentException(SR.GetString(SR.PerfInvalidCounterName, 1, MaxNameLength));
        } 

        // there is an idential copy of CheckValidId in PerformnaceCounterInstaller
        internal static bool CheckValidId(string id) {
            if (id.Length == 0 || id.Length > MaxNameLength) 
                return false;
 
            for (int index = 0; index < id.Length; ++index) { 
                char current = id[index];
 
                if ((index == 0 || index == (id.Length -1)) && current == ' ')
                    return false;

                if (current == '\"') 
                    return false;
 
                if (char.IsControl(current)) 
                    return false;
            } 

            return true;
        }
 
        internal static void CheckValidHelp(string help) {
            if (help == null) 
                throw new ArgumentNullException("help"); 

            if (help.Length > MaxHelpLength) 
                throw new ArgumentException(SR.GetString(SR.PerfInvalidHelp, 0, MaxHelpLength));
        }

        internal static void CheckValidCounterLayout(CounterCreationDataCollection counterData) { 
            // Ensure that there are no duplicate counter names being created
            Hashtable h = new Hashtable(); 
            for (int i = 0; i < counterData.Count; i++) { 
                if (counterData[i].CounterName == null || counterData[i].CounterName.Length == 0) {
                    throw new ArgumentException(SR.GetString(SR.InvalidCounterName)); 
                }

                int currentSampleType = (int)counterData[i].CounterType;
                if (    (currentSampleType  == NativeMethods.PERF_AVERAGE_BULK) || 
                        (currentSampleType  == NativeMethods.PERF_100NSEC_MULTI_TIMER) ||
                        (currentSampleType  == NativeMethods.PERF_100NSEC_MULTI_TIMER_INV) || 
                        (currentSampleType  == NativeMethods.PERF_COUNTER_MULTI_TIMER) || 
                        (currentSampleType  == NativeMethods.PERF_COUNTER_MULTI_TIMER_INV) ||
                        (currentSampleType  == NativeMethods.PERF_RAW_FRACTION) || 
                        (currentSampleType  == NativeMethods.PERF_SAMPLE_FRACTION) ||
                        (currentSampleType  == NativeMethods.PERF_AVERAGE_TIMER)) {

                    if (counterData.Count <= (i + 1)) 
                        throw new InvalidOperationException(SR.GetString(SR.CounterLayout));
                    else { 
                        currentSampleType = (int)counterData[i + 1].CounterType; 

 
                        if (!PerformanceCounterLib.IsBaseCounter(currentSampleType))
                            throw new InvalidOperationException(SR.GetString(SR.CounterLayout));
                    }
                } 
                else if (PerformanceCounterLib.IsBaseCounter(currentSampleType)) {
                    if (i == 0) 
                        throw new InvalidOperationException(SR.GetString(SR.CounterLayout)); 
                    else {
                        currentSampleType = (int)counterData[i - 1].CounterType; 

                        if (
                        (currentSampleType  != NativeMethods.PERF_AVERAGE_BULK) &&
                        (currentSampleType  != NativeMethods.PERF_100NSEC_MULTI_TIMER) && 
                        (currentSampleType  != NativeMethods.PERF_100NSEC_MULTI_TIMER_INV) &&
                        (currentSampleType  != NativeMethods.PERF_COUNTER_MULTI_TIMER) && 
                        (currentSampleType  != NativeMethods.PERF_COUNTER_MULTI_TIMER_INV) && 
                        (currentSampleType  != NativeMethods.PERF_RAW_FRACTION) &&
                        (currentSampleType  != NativeMethods.PERF_SAMPLE_FRACTION) && 
                        (currentSampleType  != NativeMethods.PERF_AVERAGE_TIMER))
                            throw new InvalidOperationException(SR.GetString(SR.CounterLayout));
                    }
 
                }
 
                if (h.ContainsKey(counterData[i].CounterName)) { 
                    throw new ArgumentException(SR.GetString(SR.DuplicateCounterName, counterData[i].CounterName));
                } 
                else {
                    h.Add(counterData[i].CounterName, String.Empty);

                    // Ensure that all counter help strings aren't null or empty 
                    if (counterData[i].CounterHelp == null || counterData[i].CounterHelp.Length == 0) {
                        counterData[i].CounterHelp = counterData[i].CounterName; 
                    } 
                }
            } 
        }

        /// 
        ///     Removes the counter (category) from the system 
        /// 
        public static void Delete(string categoryName) { 
            CheckValidCategory(categoryName); 
            string machineName = ".";
 
            PerformanceCounterPermission permission = new PerformanceCounterPermission(PerformanceCounterPermissionAccess.Administer,  machineName, categoryName);
            permission.Demand();

            SharedUtils.CheckNtEnvironment(); 

            categoryName = categoryName.ToLower(CultureInfo.InvariantCulture); 
 
            Mutex mutex = null;
            RuntimeHelpers.PrepareConstrainedRegions(); 
            try {
                SharedUtils.EnterMutex(perfMutexName, ref mutex);
                if (!PerformanceCounterLib.IsCustomCategory(machineName, categoryName))
                    throw new InvalidOperationException(SR.GetString(SR.CantDeleteCategory)); 

                SharedPerformanceCounter.RemoveAllInstances(categoryName); 
 
                PerformanceCounterLib.UnregisterCategory(categoryName);
                PerformanceCounterLib.CloseAllLibraries(); 
            }
            finally {
                if (mutex != null) {
                    mutex.ReleaseMutex(); 
                    mutex.Close();
                } 
            } 

        } 

        /// 
        ///     Returns true if the category is registered on the current machine.
        ///  
        public static bool Exists(string categoryName) {
            return Exists(categoryName, "."); 
        } 

        ///  
        ///     Returns true if the category is registered in the machine.
        /// 
        public static bool Exists(string categoryName, string machineName) {
            if (categoryName == null) 
                throw new ArgumentNullException("categoryName");
 
            if (categoryName.Length == 0) 
                throw new ArgumentException(SR.GetString(SR.InvalidParameter, "categoryName", categoryName));
 
            if (!SyntaxCheck.CheckMachineName(machineName))
                    throw new ArgumentException(SR.GetString(SR.InvalidParameter, "machineName", machineName));

            PerformanceCounterPermission permission = new PerformanceCounterPermission(PerformanceCounterPermissionAccess.Read,  machineName, categoryName); 
            permission.Demand();
 
            if (PerformanceCounterLib.IsCustomCategory(machineName , categoryName)) 
                return true;
 
            return PerformanceCounterLib.CategoryExists(machineName , categoryName);
        }

        ///  
        ///     Returns the instance names for a given category
        ///  
        ///  
        internal static string[] GetCounterInstances(string categoryName, string machineName) {
            PerformanceCounterPermission permission = new PerformanceCounterPermission(PerformanceCounterPermissionAccess.Read, machineName, categoryName); 
            permission.Demand();

            CategorySample categorySample = PerformanceCounterLib.GetCategorySample(machineName, categoryName);
            if (categorySample.InstanceNameTable.Count == 0) 
                return new string[0];
 
            string[] instanceNames = new string[categorySample.InstanceNameTable.Count]; 
            categorySample.InstanceNameTable.Keys.CopyTo(instanceNames, 0);
            if (instanceNames.Length == 1 && instanceNames[0].CompareTo(PerformanceCounterLib.SingleInstanceName) == 0) 
                return new string[0];

            return instanceNames;
        } 

        ///  
        ///     Returns an array of counters in this category.  The counter must have only one instance. 
        /// 
        public PerformanceCounter[] GetCounters() { 
            if (GetInstanceNames().Length != 0)
                throw new ArgumentException(SR.GetString(SR.InstanceNameRequired));
            return GetCounters("");
        } 

        ///  
        ///     Returns an array of counters in this category for the given instance. 
        /// 
        public PerformanceCounter[] GetCounters(string instanceName) { 
            if (instanceName == null)
                throw new ArgumentNullException("instanceName");

            if (this.categoryName == null) 
                throw new InvalidOperationException(SR.GetString(SR.CategoryNameNotSet));
 
            if (instanceName.Length != 0 && !InstanceExists(instanceName)) 
                throw new InvalidOperationException(SR.GetString(SR.MissingInstance, instanceName, categoryName));
 
            string[] counterNames = PerformanceCounterLib.GetCounters(machineName, categoryName);
            PerformanceCounter[] counters = new PerformanceCounter[counterNames.Length];
            for (int index = 0; index < counters.Length; index++)
                counters[index] = new PerformanceCounter(categoryName, counterNames[index], instanceName, machineName, true); 

            return counters; 
        } 

 
        /// 
        ///     Returns an array of performance counter categories for the current machine.
        /// 
        public static PerformanceCounterCategory[] GetCategories() { 
            return GetCategories(".");
        } 
 
        /// 
        ///     Returns an array of performance counter categories for a particular machine. 
        /// 
        public static PerformanceCounterCategory[] GetCategories(string machineName) {
            if (!SyntaxCheck.CheckMachineName(machineName))
                    throw new ArgumentException(SR.GetString(SR.InvalidParameter, "machineName", machineName)); 

            PerformanceCounterPermission permission = new PerformanceCounterPermission(PerformanceCounterPermissionAccess.Read, machineName, "*"); 
            permission.Demand(); 

            string[] categoryNames = PerformanceCounterLib.GetCategories(machineName); 
            PerformanceCounterCategory[] categories = new PerformanceCounterCategory[categoryNames.Length];
            for (int index = 0; index < categories.Length; index++)
                categories[index] = new PerformanceCounterCategory(categoryNames[index], machineName);
 
            return categories;
        } 
 
        /// 
        ///     Returns an array of instances for this category 
        /// 
        public string[] GetInstanceNames() {
            if (this.categoryName == null)
                    throw new InvalidOperationException(SR.GetString(SR.CategoryNameNotSet)); 

            return GetCounterInstances(categoryName, machineName); 
        } 

        ///  
        ///     Returns true if the instance already exists for this category.
        /// 
        public bool InstanceExists(string instanceName) {
            if (instanceName == null) 
                throw new ArgumentNullException("instanceName");
 
            if (this.categoryName == null) 
                    throw new InvalidOperationException(SR.GetString(SR.CategoryNameNotSet));
 
            CategorySample categorySample = PerformanceCounterLib.GetCategorySample(machineName, categoryName);
            return categorySample.InstanceNameTable.ContainsKey(instanceName);
        }
 
        /// 
        ///     Returns true if the instance already exists for the category specified. 
        ///  
        public static bool InstanceExists(string instanceName, string categoryName) {
            return InstanceExists(instanceName, categoryName, "."); 
        }

        /// 
        ///     Returns true if the instance already exists for this category and machine specified. 
        /// 
        public static bool InstanceExists(string instanceName, string categoryName, string machineName) { 
            if (instanceName == null) 
                throw new ArgumentNullException("instanceName");
 
            if (categoryName == null)
                throw new ArgumentNullException("categoryName");

            if (categoryName.Length == 0) 
                throw new ArgumentException(SR.GetString(SR.InvalidParameter, "categoryName", categoryName));
 
            if (!SyntaxCheck.CheckMachineName(machineName)) 
                throw new ArgumentException(SR.GetString(SR.InvalidParameter, "machineName", machineName));
 
            PerformanceCounterCategory category = new PerformanceCounterCategory(categoryName, machineName);
            return category.InstanceExists(instanceName);
        }
 
        /// 
        ///     Reads all the counter and instance data of this performance category.  Note that reading the entire category 
        ///     at once can be as efficient as reading a single counter because of the way the system provides the data. 
        /// 
        public InstanceDataCollectionCollection ReadCategory() { 
            if (this.categoryName == null)
                    throw new InvalidOperationException(SR.GetString(SR.CategoryNameNotSet));

            CategorySample categorySample = PerformanceCounterLib.GetCategorySample(this.machineName, this.categoryName); 
            return categorySample.ReadCategory();
        } 
    } 

    [Flags] 
    internal enum PerformanceCounterCategoryOptions {
        EnableReuse = 0x1,
        UseUniqueSharedMemory = 0x2,
    } 
}
 
 


                        

                        

                        
                        

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