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
- DesignerActionItemCollection.cs
- EncoderNLS.cs
- GroupBoxAutomationPeer.cs
- MenuItemBindingCollection.cs
- ItemContainerGenerator.cs
- Stacktrace.cs
- Zone.cs
- WebScriptServiceHostFactory.cs
- _ProxyChain.cs
- SQLDecimalStorage.cs
- Token.cs
- StorageComplexTypeMapping.cs
- ToolStripSplitButton.cs
- GlyphsSerializer.cs
- BooleanFunctions.cs
- StringArrayConverter.cs
- DebugTraceHelper.cs
- CharacterString.cs
- SchemaAttDef.cs
- XmlSchemaSimpleTypeUnion.cs
- Repeater.cs
- DBNull.cs
- SrgsElementList.cs
- OpCopier.cs
- XpsFixedDocumentReaderWriter.cs
- ConcurrentQueue.cs
- WebPartConnectionsEventArgs.cs
- DesignerFrame.cs
- ConnectionPool.cs
- TransactionManager.cs
- DataRowView.cs
- X509Certificate.cs
- UpdateCompiler.cs
- Span.cs
- DependencyObjectValidator.cs
- QilSortKey.cs
- TemplateBindingExtensionConverter.cs
- TextTreeInsertElementUndoUnit.cs
- BindingValueChangedEventArgs.cs
- Compress.cs
- ProtectedConfiguration.cs
- TimeIntervalCollection.cs
- HtmlInputButton.cs
- TextElementCollectionHelper.cs
- FormatterConverter.cs
- ConfigurationSection.cs
- ConfigurationSectionGroup.cs
- ServiceDebugElement.cs
- StatusBarPanel.cs
- EmptyEnumerable.cs
- _KerberosClient.cs
- GeometryHitTestParameters.cs
- SafeCoTaskMem.cs
- Tile.cs
- SqlCaseSimplifier.cs
- EmptyQuery.cs
- PropertyPushdownHelper.cs
- SqlProfileProvider.cs
- FixedSOMPageConstructor.cs
- SmiEventSink_Default.cs
- SoapServerMethod.cs
- DesignColumn.cs
- TabPanel.cs
- SqlExpander.cs
- ToolStripDropTargetManager.cs
- Point3DValueSerializer.cs
- IdentifierService.cs
- EventProvider.cs
- CapabilitiesRule.cs
- MouseDevice.cs
- PageSetupDialog.cs
- Timeline.cs
- ObjectPersistData.cs
- KeyProperty.cs
- NonBatchDirectoryCompiler.cs
- TreeNode.cs
- GeometryHitTestResult.cs
- WebHttpDispatchOperationSelector.cs
- SingleAnimationBase.cs
- TraceLog.cs
- XmlSchemaComplexType.cs
- CharEntityEncoderFallback.cs
- ImageSource.cs
- DispatcherObject.cs
- ActionFrame.cs
- ListViewItem.cs
- ContextMenu.cs
- ISCIIEncoding.cs
- ActivityInstance.cs
- Group.cs
- InstancePersistenceEvent.cs
- StateMachineHelpers.cs
- WebServiceHost.cs
- CompModSwitches.cs
- WorkflowMessageEventHandler.cs
- DataGridViewColumnConverter.cs
- ErrorCodes.cs
- RuleProcessor.cs
- DynamicPropertyHolder.cs
- TimeBoundedCache.cs