Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / 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 =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; i cache.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
- XmlDataSourceNodeDescriptor.cs
- MarshalByRefObject.cs
- WorkflowServiceNamespace.cs
- ToolStripContainerActionList.cs
- PropertyOverridesDialog.cs
- JapaneseLunisolarCalendar.cs
- RegistryConfigurationProvider.cs
- Odbc32.cs
- ColorConvertedBitmap.cs
- LayoutEvent.cs
- SqlTopReducer.cs
- Reference.cs
- SourceElementsCollection.cs
- EntityCommandCompilationException.cs
- AuthenticationModuleElementCollection.cs
- XmlWhitespace.cs
- EntityUtil.cs
- TabRenderer.cs
- EditBehavior.cs
- DataRecordInternal.cs
- TraceSection.cs
- ThreadInterruptedException.cs
- EventData.cs
- Menu.cs
- ReadOnlyDictionary.cs
- InvalidCardException.cs
- AppDomainProtocolHandler.cs
- HttpConfigurationContext.cs
- ClientSettingsSection.cs
- RowUpdatedEventArgs.cs
- CatalogPartChrome.cs
- ImageListStreamer.cs
- BrowserTree.cs
- ZoomComboBox.cs
- CodeTypeOfExpression.cs
- StringOutput.cs
- SettingsProviderCollection.cs
- ComboBox.cs
- LookupBindingPropertiesAttribute.cs
- SqlMethods.cs
- TextTreeDeleteContentUndoUnit.cs
- ConditionalAttribute.cs
- StringConcat.cs
- ContextProperty.cs
- InheritanceContextHelper.cs
- DataGrid.cs
- SectionUpdates.cs
- HostedHttpRequestAsyncResult.cs
- CreateUserErrorEventArgs.cs
- HttpException.cs
- DataObjectCopyingEventArgs.cs
- ConnectionManagementElementCollection.cs
- Hashtable.cs
- ThemeableAttribute.cs
- StorageConditionPropertyMapping.cs
- EndpointDiscoveryMetadataCD1.cs
- DefaultClaimSet.cs
- Rfc2898DeriveBytes.cs
- VirtualDirectoryMapping.cs
- ProjectedWrapper.cs
- ConfigXmlDocument.cs
- HtmlWindow.cs
- SoapHeader.cs
- TextRangeProviderWrapper.cs
- DataObjectCopyingEventArgs.cs
- ItemsControl.cs
- ForAllOperator.cs
- TextComposition.cs
- AutomationPatternInfo.cs
- AttributeCollection.cs
- RC2.cs
- DbConnectionPoolGroupProviderInfo.cs
- ComplusTypeValidator.cs
- NavigatingCancelEventArgs.cs
- FixUpCollection.cs
- LinqDataSourceInsertEventArgs.cs
- BaseProcessor.cs
- StyleCollection.cs
- linebase.cs
- DefaultAssemblyResolver.cs
- WorkflowInstance.cs
- XslAstAnalyzer.cs
- UserControlParser.cs
- HtmlMeta.cs
- SoapCodeExporter.cs
- Knowncolors.cs
- NavigationProgressEventArgs.cs
- ControlBuilderAttribute.cs
- WebControl.cs
- XPathException.cs
- DataSetUtil.cs
- ServiceDescriptionImporter.cs
- brushes.cs
- CalculatedColumn.cs
- Underline.cs
- InheritanceRules.cs
- URLIdentityPermission.cs
- TextBlockAutomationPeer.cs
- FrugalMap.cs
- GridToolTip.cs