Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / 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
- ProgressBarRenderer.cs
- DllNotFoundException.cs
- WhitespaceRuleLookup.cs
- ExclusiveCanonicalizationTransform.cs
- NextPreviousPagerField.cs
- SplayTreeNode.cs
- UrlAuthFailedErrorFormatter.cs
- BreadCrumbTextConverter.cs
- dsa.cs
- TaiwanLunisolarCalendar.cs
- listitem.cs
- DocumentOrderQuery.cs
- ArrayWithOffset.cs
- BinaryObjectInfo.cs
- ChangesetResponse.cs
- SupportingTokenListenerFactory.cs
- LongSumAggregationOperator.cs
- KeyGesture.cs
- BigInt.cs
- TrackingRecord.cs
- DesignerActionHeaderItem.cs
- EncoderReplacementFallback.cs
- MenuItemBinding.cs
- DetailsViewModeEventArgs.cs
- DiscoveryClientProtocol.cs
- MenuItemAutomationPeer.cs
- RequestCache.cs
- SingleSelectRootGridEntry.cs
- TypeSystem.cs
- ServiceBehaviorElement.cs
- ObjectTypeMapping.cs
- XsltQilFactory.cs
- ReliableChannelBinder.cs
- NavigationEventArgs.cs
- XmlDataImplementation.cs
- Encoder.cs
- XamlParser.cs
- XPathScanner.cs
- StringSource.cs
- ExpressionList.cs
- MessageSecurityOverTcp.cs
- SizeConverter.cs
- DashStyle.cs
- PersistStreamTypeWrapper.cs
- HtmlMeta.cs
- FormClosedEvent.cs
- UiaCoreProviderApi.cs
- DataStreams.cs
- XmlValidatingReader.cs
- TextTreeRootNode.cs
- BinaryReader.cs
- Resources.Designer.cs
- Mutex.cs
- InternalCache.cs
- CodePageEncoding.cs
- InvalidWMPVersionException.cs
- NameSpaceExtractor.cs
- ImageFormatConverter.cs
- CaretElement.cs
- ConfigXmlText.cs
- Message.cs
- WSHttpTransportSecurityElement.cs
- FormParameter.cs
- Stack.cs
- LinkButton.cs
- EndpointAddressElementBase.cs
- DelegateSerializationHolder.cs
- ScrollChangedEventArgs.cs
- ToolConsole.cs
- ModelServiceImpl.cs
- AppliedDeviceFiltersEditor.cs
- StylusDevice.cs
- SiteMap.cs
- NavigationExpr.cs
- BaseParagraph.cs
- ScrollableControl.cs
- WebPartMenu.cs
- __Filters.cs
- LockedHandleGlyph.cs
- TagPrefixAttribute.cs
- UpDownBase.cs
- CommandManager.cs
- TableRow.cs
- OleDbParameterCollection.cs
- AuthStoreRoleProvider.cs
- GridViewDeletedEventArgs.cs
- ParentQuery.cs
- CheckBox.cs
- DragDropManager.cs
- ToolStripHighContrastRenderer.cs
- documentsequencetextview.cs
- InvokeMethodActivity.cs
- PropertyMappingExceptionEventArgs.cs
- MustUnderstandBehavior.cs
- OpenFileDialog.cs
- GlobalAllocSafeHandle.cs
- StatusBar.cs
- GradientStop.cs
- NullableBoolConverter.cs
- NativeMethods.cs