Code:
/ FX-1434 / FX-1434 / 1.0 / 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
- XmlSchemaInfo.cs
- PtsHelper.cs
- BindingCompleteEventArgs.cs
- Color.cs
- Constants.cs
- AvtEvent.cs
- CustomWebEventKey.cs
- TraceSwitch.cs
- ReplyChannelBinder.cs
- SegmentTree.cs
- DictionaryTraceRecord.cs
- CodeFieldReferenceExpression.cs
- DependencyObject.cs
- ProcessModelSection.cs
- ListSourceHelper.cs
- ExtenderControl.cs
- RootProfilePropertySettingsCollection.cs
- PassportAuthenticationModule.cs
- ButtonColumn.cs
- AutoResetEvent.cs
- XPathAxisIterator.cs
- WebBrowserUriTypeConverter.cs
- SqlLiftIndependentRowExpressions.cs
- HostProtectionException.cs
- AccessorTable.cs
- OutputCacheSettings.cs
- BigInt.cs
- TextRunProperties.cs
- LeftCellWrapper.cs
- InkPresenter.cs
- StyleCollectionEditor.cs
- PersonalizationStateInfo.cs
- NativeCppClassAttribute.cs
- COM2Enum.cs
- ZipIOCentralDirectoryBlock.cs
- InstanceData.cs
- BrowserDefinition.cs
- LineMetrics.cs
- DataGridViewIntLinkedList.cs
- ItemChangedEventArgs.cs
- StructuredTypeEmitter.cs
- SignatureHelper.cs
- RootNamespaceAttribute.cs
- PersianCalendar.cs
- BufferedStream.cs
- AstNode.cs
- ToolZone.cs
- WeakHashtable.cs
- BaseParagraph.cs
- AlignmentXValidation.cs
- XamlFilter.cs
- OperatingSystem.cs
- BaseCollection.cs
- LoginView.cs
- KoreanLunisolarCalendar.cs
- TreeBuilder.cs
- WriteFileContext.cs
- wmiprovider.cs
- QueryCacheEntry.cs
- Utils.cs
- FlowDocumentReader.cs
- OutputWindow.cs
- XmlnsDictionary.cs
- StylusPointDescription.cs
- DBConnection.cs
- EntityContainer.cs
- Exceptions.cs
- ObjectViewEntityCollectionData.cs
- BidPrivateBase.cs
- FunctionMappingTranslator.cs
- DataServiceEntityAttribute.cs
- AppLevelCompilationSectionCache.cs
- Sql8ConformanceChecker.cs
- ColumnHeader.cs
- MatrixCamera.cs
- DesignBindingConverter.cs
- DataServiceStreamResponse.cs
- ListControl.cs
- LinkTarget.cs
- WorkflowServiceInstance.cs
- DataGrid.cs
- LongAverageAggregationOperator.cs
- DataListItemCollection.cs
- StreamResourceInfo.cs
- WebBrowserContainer.cs
- UInt64.cs
- ScriptComponentDescriptor.cs
- ToolStripControlHost.cs
- RepeaterCommandEventArgs.cs
- SqlDataSourceQueryConverter.cs
- CommandField.cs
- WrappedKeySecurityTokenParameters.cs
- RelationshipSet.cs
- SettingsProperty.cs
- FileIOPermission.cs
- XmlElementAttribute.cs
- IOThreadTimer.cs
- Int16AnimationUsingKeyFrames.cs
- EmptyQuery.cs
- RelationshipManager.cs