Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Hosting / ObjectCacheHost.cs / 1305376 / ObjectCacheHost.cs
//// Copyright (c) 2009 Microsoft Corporation. All rights reserved. // using System; using System.Runtime.Caching; using System.Runtime.Caching.Hosting; using System.Collections.Generic; using System.Web.Util; namespace System.Web.Hosting { internal sealed class ObjectCacheHost: IServiceProvider, IApplicationIdentifier, IFileChangeNotificationSystem, IMemoryCacheManager { private Object _lock = new Object(); private Dictionary_cacheInfos; internal sealed class FileChangeEventTarget { private OnChangedCallback _onChangedCallback; private FileChangeEventHandler _handler; private void OnChanged(Object sender, FileChangeEvent e) { _onChangedCallback(null); } internal FileChangeEventHandler Handler { get { return _handler; } } internal FileChangeEventTarget(OnChangedCallback onChangedCallback) { _onChangedCallback = onChangedCallback; _handler = new FileChangeEventHandler(this.OnChanged); } } internal sealed class MemoryCacheInfo { internal MemoryCache Cache; internal long Size; } Object IServiceProvider.GetService(Type service) { if (service == typeof(IFileChangeNotificationSystem)) { return this as IFileChangeNotificationSystem; } else if (service == typeof(IMemoryCacheManager)) { return this as IMemoryCacheManager; } else if (service == typeof(IApplicationIdentifier)) { return this as IApplicationIdentifier; } else { return null; } } String IApplicationIdentifier.GetApplicationId() { return HttpRuntime.AppDomainAppIdInternal; } void IFileChangeNotificationSystem.StartMonitoring(string filePath, OnChangedCallback onChangedCallback, out Object state, out DateTimeOffset lastWrite, out long fileSize) { if (filePath == null) { throw new ArgumentNullException("filePath"); } if (onChangedCallback == null) { throw new ArgumentNullException("onChangedCallback"); } FileChangeEventTarget target = new FileChangeEventTarget(onChangedCallback); FileAttributesData fad; HttpRuntime.FileChangesMonitor.StartMonitoringPath(filePath, target.Handler, out fad); if (fad == null) { fad = FileAttributesData.NonExistantAttributesData; } state = target; #if DBG Debug.Assert(fad.UtcLastWriteTime.Kind == DateTimeKind.Utc, "fad.UtcLastWriteTime.Kind == DateTimeKind.Utc"); #endif lastWrite = fad.UtcLastWriteTime; fileSize = fad.FileSize; } void IFileChangeNotificationSystem.StopMonitoring(string filePath, Object state) { if (filePath == null) { throw new ArgumentNullException("filePath"); } if (state == null) { throw new ArgumentNullException("state"); } HttpRuntime.FileChangesMonitor.StopMonitoringPath(filePath, state); } void IMemoryCacheManager.ReleaseCache(MemoryCache memoryCache) { if (memoryCache == null) { throw new ArgumentNullException("memoryCache"); } long delta = 0; lock (_lock) { if (_cacheInfos != null) { MemoryCacheInfo info = null; if (_cacheInfos.TryGetValue(memoryCache, out info)) { delta = 0 - info.Size; _cacheInfos.Remove(memoryCache); } } } if (delta != 0) { ApplicationManager appManager = HostingEnvironment.GetApplicationManager(); if (appManager != null) { appManager.GetUpdatedTotalCacheSize(delta); } } } void IMemoryCacheManager.UpdateCacheSize(long size, MemoryCache memoryCache) { if (memoryCache == null) { throw new ArgumentNullException("memoryCache"); } long delta = 0; lock (_lock) { if (_cacheInfos == null) { _cacheInfos = new Dictionary (); } MemoryCacheInfo info = null; if (!_cacheInfos.TryGetValue(memoryCache, out info)) { info = new MemoryCacheInfo(); info.Cache = memoryCache; _cacheInfos[memoryCache] = info; } delta = size - info.Size; info.Size = size; } ApplicationManager appManager = HostingEnvironment.GetApplicationManager(); if (appManager != null) { appManager.GetUpdatedTotalCacheSize(delta); } } internal long TrimCache(int percent) { long trimmedOrExpired = 0; Dictionary .KeyCollection caches = null; lock (_lock) { if (_cacheInfos != null && _cacheInfos.Count > 0) { caches = _cacheInfos.Keys; } } if (caches != null) { foreach (MemoryCache cache in caches) { trimmedOrExpired += cache.Trim(percent); } } return trimmedOrExpired; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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