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CHAPTER 6 ■ MANAGING WCF SERVICES 201ramrameshreddy.blog.comprivate PerformanceCounterCategory counterCategory = null;private PerformanceCounter totalCounter = null;private PerformanceCounter microsoftCounter = null;const double IBM_Price = 80.50D;const double MSFT_Price = 30.25D;public TradePerfMon(){if (PerformanceCounterCategory.Exists(CounterCategoryName)){PerformanceCounterCategory.Delete(CounterCategoryName);}CounterCreationData totalCounter = new CounterCreationData(TotalCounterName, "Total Dollar value of Trade Servicetransactions.",PerformanceCounterType.NumberOfItemsHEX32);CounterCreationData microsoftCounter = newCounterCreationData(MicrosoftCounterName, "Total Microsoftsecurities being traded", PerformanceCounterType.NumberOfItemsHEX32);CounterCreationDataCollection counterCollection = newCounterCreationDataCollection(new CounterCreationData[]{ totalCounter, microsoftCounter });this.counterCategory = PerformanceCounterCategory.Create(CounterCategoryName,"Trade Service PerfMon Counters",PerformanceCounterCategoryType.MultiInstance,counterCollection);totalValue = 0;microsoftVolume = 0;}}}In this code, first you initialize the variables to implement the Total Value counter and theMicrosoft Volume counter. Then you create the foundations for the performance counters inthe TradePerfMon constructor. You will first check whether the performance counter category(that is, Trade Service PerfMon) is available. If so, delete it because you will create it again.Then you create the Total Value counter and the Microsoft Volume counter and add them tothe performance counter collection.The next step is to initialize the counters. The following code illustrates this concept:public void InitializeCounters(System.ServiceModel.Description.ServiceEndpointCollection endpoints){List names = new List();foreach (ServiceEndpoint endpoint in endpoints){names.Add(string.Format("{0}@{1}",this.GetType().Name, endpoint.Address.ToString()));}ramrameshreddyramrameshreddy
amrameshreddy.blog.com202 CHAPTER 6 ■ MANAGING WCF SERVICESramrameshreddy.blog.com}while (true){try{foreach (string name in names){string condition = string.Format("SELECT * FROMService WHERE Name=\"{0}\"", name);SelectQuery query = new SelectQuery(condition);ManagementScope managementScope = newManagementScope(@"\\.\root\ServiceModel",new ConnectionOptions());ManagementObjectSearcher searcher = newManagementObjectSearcher(managementScope, query);ManagementObjectCollection instances = searcher.Get();foreach (ManagementBaseObject instance in instances){PropertyData data = instance.Properties["CounterInstanceName"];break;}}break;}catch(COMException){}this.totalCounter = new PerformanceCounter(CounterCategoryName, TotalCounterName,data.Value.ToString());this.totalCounter.ReadOnly = false;this.totalCounter.RawValue = 0;this.microsoftCounter = new PerformanceCounter(CounterCategoryName, MicrosoftCounterName,data.Value.ToString());this.microsoftCounter.ReadOnly = false;this.microsoftCounter.RawValue = 0;ramrameshreddyramrameshreddy}Console.WriteLine("Counters initialized.");In this code, you use a Windows Management Instrumentation Query Language (WQL)query to select the counters that are available to the runtime. Therefore, the query at runtime
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amrameshreddy.blog.comTHE EXPERT’
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amrameshreddy.blog.comPro WCF: Prac
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amrameshreddy.blog.comramrameshredd
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amrameshreddy.blog.comApplying Beha
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amrameshreddy.blog.comxii ■CONTEN
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amrameshreddy.blog.comxiv ■CONTEN
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amrameshreddy.blog.comxviii ■FORE
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amrameshreddy.blog.comxx ■ABOUT T
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amrameshreddy.blog.comxxviii ■INT
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amrameshreddy.blog.com4 CHAPTER 1
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amrameshreddy.blog.com426 APPENDIX
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amrameshreddy.blog.com456 ■INDEXr
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