Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / PartitionResolver.cs / 3 / PartitionResolver.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web { using System; using System.Configuration; using System.Collections; using System.Threading; using System.IO; using System.Web; using System.Web.Caching; using System.Web.Util; using System.Data; using System.Data.SqlClient; using System.Text; using System.Security.Principal; using System.Xml; using System.Collections.Specialized; using System.Configuration.Provider; using System.Globalization; using System.Web.Management; using System.Web.Hosting; using System.Web.Configuration; using System.Security.Permissions; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public interface IPartitionResolver { void Initialize(); string ResolvePartition(Object key); } internal interface IPartitionInfo { string GetTracingPartitionString(); } internal delegate IPartitionInfo CreatePartitionInfo(string connectionString); class PartitionManager : IDisposable { internal PartitionManager(CreatePartitionInfo createCallback) { _createCallback = createCallback; } HybridDictionary _partitions = new HybridDictionary(); ReaderWriterLock _lock = new ReaderWriterLock(); CreatePartitionInfo _createCallback; internal object GetPartition(IPartitionResolver partitionResolver, string id) { if (EtwTrace.IsTraceEnabled(EtwTraceLevel.Verbose, EtwTraceFlags.Infrastructure)) EtwTrace.Trace(EtwTraceType.ETW_TYPE_SESSIONSTATE_PARTITION_START, HttpContext.Current.WorkerRequest, partitionResolver.GetType().FullName, id); string partitionString = null; string errorMessage = null; IPartitionInfo partitionInfo = null; try { try { partitionString = partitionResolver.ResolvePartition(id); if (partitionString == null) { throw new HttpException( SR.GetString(SR.Bad_partition_resolver_connection_string, partitionResolver.GetType().FullName)); } } catch (Exception e) { errorMessage = e.Message; throw; } try { _lock.AcquireReaderLock(-1); partitionInfo = (IPartitionInfo)_partitions[partitionString]; if (partitionInfo != null) { Debug.Trace("PartitionManager", "id=" + id + "; partitionString=" + partitionString); return partitionInfo; } } finally { if (_lock.IsReaderLockHeld) { _lock.ReleaseReaderLock(); } } // Not found. Has to add it. try { _lock.AcquireWriterLock(-1); // One more time partitionInfo = (IPartitionInfo)_partitions[partitionString]; if (partitionInfo == null) { partitionInfo = _createCallback(partitionString); Debug.Trace("PartitionManager", "Add a new partition; id=" + id + "; partitionString=" + partitionString); _partitions.Add(partitionString, partitionInfo); } Debug.Trace("PartitionManager", "id=" + id + "; partitionString=" + partitionString); return partitionInfo; } finally { if (_lock.IsWriterLockHeld) { _lock.ReleaseWriterLock(); } } } finally { if (EtwTrace.IsTraceEnabled(EtwTraceLevel.Verbose, EtwTraceFlags.Infrastructure)) { string msg = errorMessage; if (msg == null) { if (partitionInfo != null) { msg = partitionInfo.GetTracingPartitionString(); } else { msg = String.Empty; } } EtwTrace.Trace(EtwTraceType.ETW_TYPE_SESSIONSTATE_PARTITION_END, HttpContext.Current.WorkerRequest, msg); } } } public void Dispose() { if (_partitions == null) { return; } try { _lock.AcquireWriterLock(-1); if (_partitions != null) { foreach (PartitionInfo partitionInfo in _partitions.Values) { partitionInfo.Dispose(); } _partitions = null; } } catch { // ignore exceptions in dispose } finally { if (_lock.IsWriterLockHeld) { _lock.ReleaseWriterLock(); } } } } internal class PartitionInfo : IDisposable, IPartitionInfo { ResourcePool _rpool; internal PartitionInfo(ResourcePool rpool) { _rpool = rpool; } internal object RetrieveResource() { return _rpool.RetrieveResource(); } internal void StoreResource(IDisposable o) { _rpool.StoreResource(o); } protected virtual string TracingPartitionString { get { return String.Empty; } } string IPartitionInfo.GetTracingPartitionString() { return TracingPartitionString; } public void Dispose() { if (_rpool == null) { return; } lock (this) { if (_rpool != null) { _rpool.Dispose(); _rpool = null; } } } }; }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- Scene3D.cs
- ResourceManager.cs
- SplineKeyFrames.cs
- SourceFileInfo.cs
- ProviderSettingsCollection.cs
- DatatypeImplementation.cs
- SemaphoreFullException.cs
- TypeSource.cs
- WebServiceHost.cs
- PerfCounterSection.cs
- Classification.cs
- AccessDataSourceView.cs
- SpellerInterop.cs
- AudioSignalProblemOccurredEventArgs.cs
- XPathConvert.cs
- TextWriter.cs
- invalidudtexception.cs
- CustomErrorsSection.cs
- WmpBitmapDecoder.cs
- FlowDocumentPage.cs
- GB18030Encoding.cs
- ErrorStyle.cs
- PolicyDesigner.cs
- SerializationAttributes.cs
- SetStoryboardSpeedRatio.cs
- InstanceHandleReference.cs
- MediaSystem.cs
- VisualTransition.cs
- WebBrowserNavigatingEventHandler.cs
- TouchDevice.cs
- Point3D.cs
- AttributedMetaModel.cs
- HttpCapabilitiesSectionHandler.cs
- CriticalFinalizerObject.cs
- CodeSnippetCompileUnit.cs
- ItemMap.cs
- FixedHighlight.cs
- SQLSingleStorage.cs
- ShaderRenderModeValidation.cs
- InvalidFilterCriteriaException.cs
- RangeBase.cs
- MediaPlayer.cs
- EdmScalarPropertyAttribute.cs
- VariableQuery.cs
- WebPartZoneCollection.cs
- SymbolEqualComparer.cs
- Comparer.cs
- X509Chain.cs
- SystemSounds.cs
- BaseCodePageEncoding.cs
- MultiSelector.cs
- PermissionSet.cs
- DefaultMemberAttribute.cs
- IsolationInterop.cs
- SqlCachedBuffer.cs
- Rule.cs
- OracleNumber.cs
- PropertyOverridesTypeEditor.cs
- DirectionalLight.cs
- GeneralTransform3DCollection.cs
- TabPanel.cs
- RoutingService.cs
- LogEntrySerializationException.cs
- ClusterUtils.cs
- mediapermission.cs
- Vector3DConverter.cs
- MemberPath.cs
- PersonalizationStateInfoCollection.cs
- NativeMethodsOther.cs
- CounterSampleCalculator.cs
- TextMarkerSource.cs
- IImplicitResourceProvider.cs
- WmpBitmapDecoder.cs
- Predicate.cs
- RegularExpressionValidator.cs
- HitTestResult.cs
- DependencyPropertyAttribute.cs
- DivideByZeroException.cs
- SHA512Cng.cs
- KeyGestureValueSerializer.cs
- TextOutput.cs
- BinaryObjectWriter.cs
- ShaderEffect.cs
- RouteItem.cs
- IntSecurity.cs
- FlowDocumentView.cs
- ResourcePart.cs
- HttpCookiesSection.cs
- XmlSchemaComplexContentExtension.cs
- ConsoleKeyInfo.cs
- ContextStaticAttribute.cs
- BasicKeyConstraint.cs
- XmlC14NWriter.cs
- ServiceElement.cs
- InlineUIContainer.cs
- Propagator.cs
- DbXmlEnabledProviderManifest.cs
- BitmapPalette.cs
- ExtendedProperty.cs
- CursorConverter.cs