Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Utils / CacheDict.cs / 1305376 / CacheDict.cs
/* **************************************************************************** * * Copyright (c) Microsoft Corporation. * * This source code is subject to terms and conditions of the Microsoft Public License. A * copy of the license can be found in the License.html file at the root of this distribution. If * you cannot locate the Microsoft Public License, please send an email to * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound * by the terms of the Microsoft Public License. * * You must not remove this notice, or any other, from this software. * * * ***************************************************************************/ using System; using System.Collections.Generic; using System.Text; using System.Diagnostics; namespace System.Dynamic.Utils { ////// Provides a dictionary-like object used for caches which holds onto a maximum /// number of elements specified at construction time. /// /// This class is not thread safe. /// internal class CacheDict{ private readonly Dictionary _dict = new Dictionary (); private readonly LinkedList _list = new LinkedList (); private readonly int _maxSize; /// /// Creates a dictionary-like object used for caches. /// /// The maximum number of elements to store. internal CacheDict(int maxSize) { _maxSize = maxSize; } ////// Tries to get the value associated with 'key', returning true if it's found and /// false if it's not present. /// internal bool TryGetValue(TKey key, out TValue value) { KeyInfo storedValue; if (_dict.TryGetValue(key, out storedValue)) { LinkedListNodenode = storedValue.List; if (node.Previous != null) { // move us to the head of the list... _list.Remove(node); _list.AddFirst(node); } value = storedValue.Value; return true; } value = default(TValue); return false; } /// /// Adds a new element to the cache, replacing and moving it to the front if the /// element is already present. /// internal void Add(TKey key, TValue value) { KeyInfo keyInfo; if (_dict.TryGetValue(key, out keyInfo)) { // remove original entry from the linked list _list.Remove(keyInfo.List); } else if (_list.Count == _maxSize) { // we've reached capacity, remove the last used element... LinkedListNodenode = _list.Last; _list.RemoveLast(); bool res = _dict.Remove(node.Value); Debug.Assert(res); } // add the new entry to the head of the list and into the dictionary LinkedListNode listNode = new LinkedListNode (key); _list.AddFirst(listNode); _dict[key] = new CacheDict .KeyInfo(value, listNode); } /// /// Returns the value associated with the given key, or throws KeyNotFoundException /// if the key is not present. /// internal TValue this[TKey key] { get { TValue res; if (TryGetValue(key, out res)) { return res; } throw new KeyNotFoundException(); } set { Add(key, value); } } private struct KeyInfo { internal readonly TValue Value; internal readonly LinkedListNodeList; internal KeyInfo(TValue value, LinkedListNode list) { Value = value; List = list; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. /* **************************************************************************** * * Copyright (c) Microsoft Corporation. * * This source code is subject to terms and conditions of the Microsoft Public License. A * copy of the license can be found in the License.html file at the root of this distribution. If * you cannot locate the Microsoft Public License, please send an email to * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound * by the terms of the Microsoft Public License. * * You must not remove this notice, or any other, from this software. * * * ***************************************************************************/ using System; using System.Collections.Generic; using System.Text; using System.Diagnostics; namespace System.Dynamic.Utils { /// /// Provides a dictionary-like object used for caches which holds onto a maximum /// number of elements specified at construction time. /// /// This class is not thread safe. /// internal class CacheDict{ private readonly Dictionary _dict = new Dictionary (); private readonly LinkedList _list = new LinkedList (); private readonly int _maxSize; /// /// Creates a dictionary-like object used for caches. /// /// The maximum number of elements to store. internal CacheDict(int maxSize) { _maxSize = maxSize; } ////// Tries to get the value associated with 'key', returning true if it's found and /// false if it's not present. /// internal bool TryGetValue(TKey key, out TValue value) { KeyInfo storedValue; if (_dict.TryGetValue(key, out storedValue)) { LinkedListNodenode = storedValue.List; if (node.Previous != null) { // move us to the head of the list... _list.Remove(node); _list.AddFirst(node); } value = storedValue.Value; return true; } value = default(TValue); return false; } /// /// Adds a new element to the cache, replacing and moving it to the front if the /// element is already present. /// internal void Add(TKey key, TValue value) { KeyInfo keyInfo; if (_dict.TryGetValue(key, out keyInfo)) { // remove original entry from the linked list _list.Remove(keyInfo.List); } else if (_list.Count == _maxSize) { // we've reached capacity, remove the last used element... LinkedListNodenode = _list.Last; _list.RemoveLast(); bool res = _dict.Remove(node.Value); Debug.Assert(res); } // add the new entry to the head of the list and into the dictionary LinkedListNode listNode = new LinkedListNode (key); _list.AddFirst(listNode); _dict[key] = new CacheDict .KeyInfo(value, listNode); } /// /// Returns the value associated with the given key, or throws KeyNotFoundException /// if the key is not present. /// internal TValue this[TKey key] { get { TValue res; if (TryGetValue(key, out res)) { return res; } throw new KeyNotFoundException(); } set { Add(key, value); } } private struct KeyInfo { internal readonly TValue Value; internal readonly LinkedListNodeList; internal KeyInfo(TValue value, LinkedListNode list) { Value = value; List = list; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- PropertyEmitterBase.cs
- OutOfProcStateClientManager.cs
- MethodBody.cs
- SystemColorTracker.cs
- RoleGroupCollection.cs
- dbenumerator.cs
- SafeThreadHandle.cs
- WindowsFormsSynchronizationContext.cs
- ToolStripGripRenderEventArgs.cs
- SerializationStore.cs
- NumberFunctions.cs
- GPRECT.cs
- TreeNodeConverter.cs
- PreloadedPackages.cs
- WinCategoryAttribute.cs
- LoopExpression.cs
- Misc.cs
- SystemResourceKey.cs
- DocumentPageHost.cs
- SplitterEvent.cs
- MethodAccessException.cs
- CacheEntry.cs
- MailSettingsSection.cs
- TrustManagerPromptUI.cs
- CategoryValueConverter.cs
- Int32CollectionConverter.cs
- SemaphoreSecurity.cs
- ReadOnlyDataSource.cs
- LifetimeMonitor.cs
- DataServiceQueryOfT.cs
- ListBoxAutomationPeer.cs
- NativeMethods.cs
- cryptoapiTransform.cs
- ObjectCloneHelper.cs
- SymLanguageType.cs
- RequestCachePolicy.cs
- EmbeddedMailObjectsCollection.cs
- PageParserFilter.cs
- EnumDataContract.cs
- OptimisticConcurrencyException.cs
- StringResourceManager.cs
- SendMailErrorEventArgs.cs
- SHA512Managed.cs
- CustomWebEventKey.cs
- HwndProxyElementProvider.cs
- ColorAnimation.cs
- TextAutomationPeer.cs
- TwoPhaseCommit.cs
- FlowDocument.cs
- IdentityModelDictionary.cs
- DataControlLinkButton.cs
- MethodCallExpression.cs
- SessionViewState.cs
- MouseEventArgs.cs
- XmlElementList.cs
- InputLanguageSource.cs
- ExpressionBinding.cs
- dbenumerator.cs
- ConstraintStruct.cs
- ScrollBar.cs
- MethodCallConverter.cs
- WebPartZone.cs
- DataGridViewCellMouseEventArgs.cs
- RevocationPoint.cs
- StylusTip.cs
- ContractSearchPattern.cs
- WebConfigurationFileMap.cs
- AttachedPropertyDescriptor.cs
- UnsafeNativeMethods.cs
- ReliableInputConnection.cs
- MethodRental.cs
- SqlResolver.cs
- SliderAutomationPeer.cs
- XmlCDATASection.cs
- PropertyFilterAttribute.cs
- StreamingContext.cs
- Attributes.cs
- MemoryMappedView.cs
- DataRecordInfo.cs
- MethodExpression.cs
- ProcessProtocolHandler.cs
- SqlFacetAttribute.cs
- MTConfigUtil.cs
- SymmetricKey.cs
- TransformedBitmap.cs
- Item.cs
- HtmlTitle.cs
- StringUtil.cs
- HeaderCollection.cs
- SQLConvert.cs
- NullExtension.cs
- ObjectRef.cs
- CancellableEnumerable.cs
- ZipIORawDataFileBlock.cs
- JsonObjectDataContract.cs
- NullableDoubleMinMaxAggregationOperator.cs
- WebPartDescriptionCollection.cs
- Stackframe.cs
- DataGridViewComboBoxEditingControl.cs
- Schema.cs