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Measuring and Monitoring WCF Web Service Performance

, 4 Oct 2012
Using ServiceMon to obtain performance statistics for web services
ServiceMonExtensionExample-noexe.zip
ServiceMonExtensionExample
ServiceMonExtensions
Properties
Service References
TempConvertWebService
configuration.svcinfo
configuration91.svcinfo
Reference.svcmap
tempconvert.wsdl
Tests
Properties
ServiceMonExtensionExample.zip
bin
Kaleida.ServiceMonitor.Framework.dll
configuration.svcinfo
configuration91.svcinfo
Reference.svcmap
tempconvert.wsdl
ServiceMon_v1.0.0_Source-noexe.zip
ServiceMon v1.0.0 Source
BuildTools
antlr-3.2.jar
nUnit
Failure.jpg
Ignored.jpg
NUnitTests.nunit
Success.jpg
tempfile.tmp
Everything.build
Kaleida.ServiceMonitor.CodePlexUploader
Kaleida.ServiceMonitor.Framework
Properties
Responses
Kaleida.ServiceMonitor.Model
Email
Layout
Parsing
ScriptGrammar.g
Properties
Runtime
ScriptDirectives
Statistics
StructuredSource
Kaleida.ServiceMonitor.Operations
PreparedRequests
Properties
ResponseHandlers
Kaleida.ServiceMonitor.UI
Application.ico
Icons
Application.ico
Error.ico
Running.ico
Stopped.ico
Kaleida.ProductBuilder.ServiceMonitor.csproj.DotSettings
Kaleida.ProductBuilder.ServiceMonitor.csproj.DotSettings.user
Kaleida.ProductBuilder.ServiceMonitor.csproj.ReSharper
NotificationPanels
Properties
Settings.settings
Scripts
Introductory Examples.mscr
More Examples.mscr
Kaleida.ServiceMonitor.UnitTests
Framework
Model
Email
Layout
Parsing
Runtime
Statistics
Operations
Scripts
Setup
DialogBackround.bmp
DialogBackround.pdn
DialogTopBanner.bmp
GPLv3License.rtf
Product.wxs
Setup.wixproj
ServiceMon_v1.0.0_Source.zip
bin
Antlr3.Runtime.dll
CodePlex.WebServices.Client.dll
JetBrains.Annotations.dll
log4net.dll
antlr-3.2.jar
Failure.jpg
fit.dll
Ignored.jpg
loadtest-assembly.dll
mock-assembly.dll
nonamespace-assembly.dll
notestfixtures-assembly.dll
nunit-console-runner.dll
nunit-console-x86.exe
nunit-console.exe
nunit-console.tests.dll
nunit-gui-runner.dll
nunit-gui.exe
nunit-gui.tests.dll
nunit-test-server.dll
nunit-x86.exe
nunit.core.dll
nunit.core.extensions.dll
nunit.core.interfaces.dll
nunit.core.tests.dll
nunit.exe
nunit.extensions.tests.dll
nunit.fixtures.dll
nunit.fixtures.tests.dll
nunit.framework.dll
nunit.framework.extensions.dll
nunit.framework.tests.dll
nunit.mocks.dll
nunit.mocks.tests.dll
nunit.testutilities.dll
nunit.uikit.dll
nunit.uikit.tests.dll
nunit.util.dll
nunit.util.tests.dll
NUnitTests.nunit
runFile.exe
Success.jpg
tempfile.tmp
test-assembly.dll
test-utilities.dll
timing-tests.dll
WixFileVersionExtension.dll
COPYING
Everything.build
Properties
ScriptGrammar.g
Application.ico
Application.ico
Error.ico
Running.ico
Stopped.ico
Kaleida.ProductBuilder.ServiceMonitor.csproj.DotSettings
Kaleida.ProductBuilder.ServiceMonitor.csproj.DotSettings.user
Kaleida.ProductBuilder.ServiceMonitor.csproj.ReSharper
Settings.settings
Introductory Examples.mscr
More Examples.mscr
DialogBackround.bmp
DialogBackround.pdn
DialogTopBanner.bmp
GPLv3License.rtf
Product.wxs
Setup.wixproj
using System;
using System.Diagnostics;
using System.Linq;
using Kaleida.ServiceMonitor.Model.Runtime;
using log4net;

namespace Kaleida.ServiceMonitor.Model
{
    public class Monitor
    {
        private static readonly ILog log = LogManager.GetLogger(typeof (Monitor));
        private static readonly ILog resultsLog = LogManager.GetLogger("ResultsLog");

        private readonly ScriptWorkspace workspace = new ScriptWorkspace();
        private readonly MonitorState state = new MonitorState();

        internal event EventHandler<OperationSuccessfulEventArgs> OperationSuccessful;
        internal event EventHandler<OperationFailedEventArgs> OperationFailed;
        internal event EventHandler ErrorsAcknowledged;
        internal event EventHandler<ScriptCompilationCompleteEventArgs> ScriptCompilationComplete;

        private readonly LimitedList<RequestResult> recentResponses;
        private readonly LimitedList<RequestResult> recentErrors;
        private readonly OperationStatisticsMap statistics = new OperationStatisticsMap();

        private readonly object responseProcessingLock = new object();
        private readonly IConfiguration configuration;

        public Monitor(IConfiguration configuration)
        {
            this.configuration = configuration;

            recentResponses = new LimitedList<RequestResult>("Response", configuration.MaximumResponses);
            recentErrors = new LimitedList<RequestResult>("Error", configuration.MaximumErrors);

            workspace.CurrentScriptChanged += (s, e) => TryCompileCurrentScript();
            workspace.CurrentScriptContentChanged += (s, e) => TryCompileCurrentScript();

            state.MonitorStarted += (s, e) => statistics.Start();
        }

        public ScriptWorkspace Workspace
        {
            get { return workspace; }
        }

        public MonitorState State
        {
            get { return state; }
        }

        public OperationStatisticsMap Statistics
        {
            get { return statistics; }
        }

        private void TryCompileCurrentScript()
        {
            var scriptSource = workspace.CurrentScript;
            var compilation = scriptSource.Compile();

            if (ScriptCompilationComplete != null)
                ScriptCompilationComplete(this, new ScriptCompilationCompleteEventArgs(compilation));

            state.ScriptCompiled(compilation);
        }

        public LimitedList<RequestResult> RecentResponses
        {
            get { return recentResponses; }
        }

        public LimitedList<RequestResult> RecentErrors
        {
            get { return recentErrors; }
        }

        public IConfiguration Configuration
        {
            get { return configuration; }
        }

        public void InvokeNextOperation()
        {
            var currentCompilation = State.ScriptCompilation;
            if (currentCompilation == null || !currentCompilation.Succeeded || !currentCompilation.CompiledScript.Operations.Any())
                return;

            var operation = currentCompilation.CompiledScript.ExecutionOrder.SelectItem(currentCompilation.CompiledScript.Operations);
            log.DebugFormat("Calling operation {0}", operation.Description);

            var sentOn = DateTime.Now;

            try
            {
                var sw = Stopwatch.StartNew();
                var response = operation.Invoke();
                sw.Stop();

                string responseSummary = operation.ProcessResponse(response) ?? "";
                var result = new RequestSuccessResult(operation, sentOn, sw.Elapsed, responseSummary);

                OperationCompletedSuccessfully(operation, result);
            }
            catch (Exception exception)
            {
                var result = new RequestErrorResult(operation, sentOn, exception);
                OperationFailureOccurred(operation, result);
            }
        }

        private void OperationCompletedSuccessfully(IOperation operation, RequestSuccessResult result)
        {
            lock (responseProcessingLock)
            {
                Statistics.IncrementSuccessCount(operation, result.RequestDuration);

                AddResult(result);

                if (OperationSuccessful != null)
                    OperationSuccessful(this, new OperationSuccessfulEventArgs(operation, result));
            }
        }

        private void OperationFailureOccurred(IOperation operation, RequestErrorResult result)
        {
            lock (responseProcessingLock)
            {
                Statistics.IncrementFailureCount(operation);

                AddResult(result);

                var error = new OperationError(result.Exception.Message, DateTime.Now);
                State.FlagError(error);

                if (OperationFailed != null)
                    OperationFailed(this, new OperationFailedEventArgs(operation, result));
            }
        }

        private void AddResult(RequestResult request)
        {
            resultsLog.Info(request.ToClipboardItemText());

            recentResponses.AddToTop(request);
            
            if (request is RequestErrorResult)
            {
                recentErrors.AddToTop(request);
            }
        }

        public void AcknowledgeErrors()
        {
            State.ClearErrors();

            if (ErrorsAcknowledged != null)
                ErrorsAcknowledged(this, EventArgs.Empty);
        }
    }
}

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This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)

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About the Author

Stuart Wheelwright
Architect BlackJet Software Ltd
United Kingdom United Kingdom
Stuart Wheelwright is the Principal Architect and Software Developer at BlackJet Software Ltd.
 
He has over 16 years commercial experience producing robust, maintainable, web-based solutions and bespoke systems for Microsoft platforms.
 
His latest project is Shopping UK, an elegantly simple shopping list for iPhone.
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Web03 | 2.8.140826.1 | Last Updated 4 Oct 2012
Article Copyright 2012 by Stuart Wheelwright
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