Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Reflection / Cache / InternalCache.cs / 1 / InternalCache.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: InternalCache ** ** ** Purpose: A high-performance internal caching class. All key ** lookups are done on the basis of the CacheObjType enum. The ** cache is limited to one object of any particular type per ** instance. ** ** ============================================================*/ using System; using System.Threading; using System.Diagnostics; using System.Runtime.CompilerServices; using System.Runtime.Remoting.Metadata; namespace System.Reflection.Cache { [Serializable] internal enum CacheAction { AllocateCache = 1, AddItem = 2, ClearCache = 3, LookupItemHit = 4, LookupItemMiss = 5, GrowCache = 6, SetItemReplace = 7, ReplaceFailed = 8 } [Serializable] internal class InternalCache { private const int MinCacheSize = 2; //We'll start the cache as null and only grow it as we need it. private InternalCacheItem[] m_cache=null; private int m_numItems = 0; // private bool m_copying = false; //Knowing the name of the cache is very useful for debugging, but we don't //want to take the working-set hit in the debug build. We'll only include //the field in that build. #if _LOGGING private String m_cacheName; #endif internal InternalCache(String cacheName) { #if _LOGGING m_cacheName = cacheName; #endif //We won't allocate any items until the first time that they're requested. } internal Object this[CacheObjType cacheType] { get { //Let's snapshot a reference to the array up front so that //we don't have to worry about any writers. It's important //to grab the cache first and then numItems. In the event that //the cache gets cleared, m_numItems will be set to 0 before //we actually release the cache. Getting it second will cause //us to walk only 0 elements, but not to fault. InternalCacheItem[] cache = m_cache; int numItems = m_numItems; int position = FindObjectPosition(cache, numItems, cacheType, false); if (position>=0) { if (!BCLDebug.m_loggingNotEnabled) LogAction(CacheAction.LookupItemHit, cacheType, cache[position].Value); return cache[position].Value; } //Couldn't find it -- oh, well. if (!BCLDebug.m_loggingNotEnabled) LogAction(CacheAction.LookupItemMiss, cacheType); return null; } set { int position; if (!BCLDebug.m_loggingNotEnabled) LogAction(CacheAction.AddItem, cacheType, value); lock(this) { position = FindObjectPosition(m_cache, m_numItems, cacheType, true); if (position>0) { m_cache[position].Value = value; m_cache[position].Key = cacheType; if (position==m_numItems) { m_numItems++; } return; } if (m_cache==null) { if (!BCLDebug.m_loggingNotEnabled) LogAction(CacheAction.AllocateCache, cacheType); // m_copying = true; m_cache = new InternalCacheItem[MinCacheSize]; m_cache[0].Value = value; m_cache[0].Key = cacheType; m_numItems = 1; // m_copying = false; } else { if (!BCLDebug.m_loggingNotEnabled) LogAction(CacheAction.GrowCache, cacheType); // m_copying = true; InternalCacheItem[] tempCache = new InternalCacheItem[m_numItems * 2]; for (int i=0; icache.Length) { itemCount = cache.Length; } for (int i=0; i
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DropShadowBitmapEffect.cs
- SplashScreen.cs
- Scripts.cs
- RegistrationProxy.cs
- SqlWriter.cs
- ClientBuildManager.cs
- ClientTargetSection.cs
- ToolStripDropDownItem.cs
- InputElement.cs
- SurrogateSelector.cs
- PartialList.cs
- Identity.cs
- TextDecorationCollection.cs
- DataGridItemEventArgs.cs
- ProtocolsSection.cs
- WebHttpBindingCollectionElement.cs
- CodeConditionStatement.cs
- ContentValidator.cs
- IQueryable.cs
- EncodingDataItem.cs
- SqlUserDefinedAggregateAttribute.cs
- SweepDirectionValidation.cs
- QueryCursorEventArgs.cs
- DataGridViewCellEventArgs.cs
- IImplicitResourceProvider.cs
- SequenceFullException.cs
- PropertyGridCommands.cs
- ListViewUpdatedEventArgs.cs
- List.cs
- Panel.cs
- ContextBase.cs
- HuffModule.cs
- FormatterServices.cs
- DataSourceHelper.cs
- SerializableAttribute.cs
- XmlCollation.cs
- BigInt.cs
- SoapExtensionTypeElementCollection.cs
- AsyncDataRequest.cs
- XmlSchemaType.cs
- DeriveBytes.cs
- OleDbTransaction.cs
- Int64AnimationUsingKeyFrames.cs
- Style.cs
- StringUtil.cs
- x509store.cs
- WpfSharedXamlSchemaContext.cs
- HttpResponse.cs
- LineSegment.cs
- FragmentQueryKB.cs
- GenericUriParser.cs
- StringArrayConverter.cs
- ItemCollection.cs
- keycontainerpermission.cs
- ManagementDateTime.cs
- TrustManagerMoreInformation.cs
- AllMembershipCondition.cs
- Msmq4PoisonHandler.cs
- BevelBitmapEffect.cs
- TypeDefinition.cs
- DecoderFallbackWithFailureFlag.cs
- BreakRecordTable.cs
- IndexedEnumerable.cs
- LinkedResource.cs
- ConfigurationManagerHelper.cs
- DataFieldEditor.cs
- RegionData.cs
- ButtonFieldBase.cs
- XmlSchemaType.cs
- TypedOperationInfo.cs
- RequestDescription.cs
- XmlnsDefinitionAttribute.cs
- WebRequest.cs
- ObjectDataSourceView.cs
- DataGridLinkButton.cs
- DataGridLinkButton.cs
- MessagePartProtectionMode.cs
- XmlNodeReader.cs
- loginstatus.cs
- WebServiceErrorEvent.cs
- ProcessHostConfigUtils.cs
- XmlSchemaGroup.cs
- XPathConvert.cs
- CultureData.cs
- ContainerUIElement3D.cs
- HtmlTextArea.cs
- TdsParserSafeHandles.cs
- EntitySqlQueryCacheEntry.cs
- XsltQilFactory.cs
- ToolBarDesigner.cs
- CollectionViewGroupRoot.cs
- DataServiceProcessingPipelineEventArgs.cs
- DataGridViewMethods.cs
- CompositeControl.cs
- CompiledAction.cs
- DispatchChannelSink.cs
- Form.cs
- ResourceExpression.cs
- TextBoxLine.cs
- EDesignUtil.cs