Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / xsp / System / Web / PartitionResolver.cs / 2 / 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; } } } }; } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- MetadataItemSerializer.cs
- InvalidDataException.cs
- XmlQueryContext.cs
- InvokeProviderWrapper.cs
- RuleSettingsCollection.cs
- BamlResourceDeserializer.cs
- RtfNavigator.cs
- OperatingSystem.cs
- BitmapFrameDecode.cs
- Int16AnimationUsingKeyFrames.cs
- AttachedAnnotation.cs
- ColumnResizeUndoUnit.cs
- SafeHandles.cs
- ArrayConverter.cs
- SafeNativeMethods.cs
- Bidi.cs
- ClientOperation.cs
- Listbox.cs
- Executor.cs
- DispatcherProcessingDisabled.cs
- ConstraintConverter.cs
- StyleXamlTreeBuilder.cs
- Point3DConverter.cs
- manifestimages.cs
- FormViewCommandEventArgs.cs
- URLAttribute.cs
- IpcServerChannel.cs
- DataKeyCollection.cs
- ExceptionCollection.cs
- __ComObject.cs
- BitmapEffectGeneralTransform.cs
- FixedSOMGroup.cs
- LinkUtilities.cs
- DictionaryBase.cs
- SpotLight.cs
- AvTraceDetails.cs
- PreloadedPackages.cs
- DataControlPagerLinkButton.cs
- ResourcesBuildProvider.cs
- SQLInt32.cs
- ProcessHostServerConfig.cs
- TreeIterators.cs
- Size.cs
- SemaphoreFullException.cs
- SmiEventSink_Default.cs
- ACL.cs
- TemplateAction.cs
- QilName.cs
- Int32.cs
- InOutArgumentConverter.cs
- DataGridBoolColumn.cs
- ValidatorCompatibilityHelper.cs
- StructuredProperty.cs
- XmlBinaryReader.cs
- SchemaInfo.cs
- TextElementAutomationPeer.cs
- MenuItemCollection.cs
- ChannelServices.cs
- RuleSettingsCollection.cs
- _Win32.cs
- MimeXmlReflector.cs
- TraceHandler.cs
- LoginCancelEventArgs.cs
- _NetRes.cs
- PersonalizablePropertyEntry.cs
- GetIndexBinder.cs
- DesignerCategoryAttribute.cs
- WebPartConnection.cs
- Transform.cs
- NameValuePair.cs
- FastEncoderWindow.cs
- BigInt.cs
- Int32Storage.cs
- FactoryMaker.cs
- PolyBezierSegment.cs
- StringSource.cs
- QuaternionKeyFrameCollection.cs
- StringToken.cs
- XmlSchemaSubstitutionGroup.cs
- ApplicationBuildProvider.cs
- PairComparer.cs
- DomainLiteralReader.cs
- Marshal.cs
- ManualResetEvent.cs
- ToolStripLabel.cs
- TypefaceCollection.cs
- ConnectionManagementElementCollection.cs
- Logging.cs
- EventToken.cs
- TextParaLineResult.cs
- ContentType.cs
- SchemaTableOptionalColumn.cs
- Descriptor.cs
- XsltContext.cs
- FormatConvertedBitmap.cs
- WebPartRestoreVerb.cs
- ClientBuildManagerCallback.cs
- WindowsScrollBar.cs
- DataGridViewIntLinkedList.cs
- PersonalizationProvider.cs