Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/Cache/CacheEntry.cs

@@ -0,0 +1,431 @@
+//------------------------------------------------------------------------------
+// <copyright file="CacheEntry.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ * CacheEntry
+ * 
+ * Copyright (c) 1998-1999, Microsoft Corporation
+ * 
+ */
+
+namespace System.Web.Caching {
+    using System.Text;
+    using System.Threading;
+    using System.Web;
+    using System.Web.Util;
+    using System.Collections;
+    using System.Web.Management;
+    using System.Web.Hosting;
+    using System.Globalization;
+
+    internal class CacheKey {
+        protected const byte BitPublic = 0x20;
+        protected const byte BitOutputCache = 0x40;
+
+        protected string    _key;   /* key to the item */
+        protected byte      _bits;  /* cache lifetime state and public property */
+        int                 _hashCode;
+
+        internal CacheKey(String key, bool isPublic) {
+            if (key == null) {
+                throw new ArgumentNullException("key");
+            }
+    
+            _key = key;
+            if (isPublic) {
+                _bits = BitPublic;
+            }
+            else if (key[0] == CacheInternal.PrefixOutputCache[0]) {
+                _bits |= BitOutputCache;
+            }
+
+#if DBG
+            if (!isPublic) {
+                Debug.Assert(CacheInternal.PrefixFIRST[0] <= key[0] && key[0] <= CacheInternal.PrefixLAST[0],
+                             "CacheInternal.PrefixFIRST[0] <= key[0] && key[0] <= CacheInternal.PrefixLAST[0], key=" + key);
+            }
+#endif
+        }
+
+        internal String Key {
+            get {return _key;}
+        }
+
+        internal bool IsOutputCache {
+            get { return (_bits & BitOutputCache) != 0; }
+        }
+
+        internal bool IsPublic {
+            get { return (_bits & BitPublic) != 0; }
+        }
+
+        public override int GetHashCode() {
+            if (_hashCode == 0) {
+                _hashCode = _key.GetHashCode();
+            }
+
+            return _hashCode;
+        }
+
+#if DBG
+        public override string ToString() {
+            return (IsPublic ? "P:" : "I:") + _key;
+        }
+#endif
+    }
+
+    /*
+     * An entry in the cache.
+     * Overhead is 68 bytes + object header.
+     */
+    internal sealed class CacheEntry : CacheKey, ICacheDependencyChanged {
+        static readonly DateTime    NoAbsoluteExpiration = DateTime.MaxValue;
+        static readonly TimeSpan    NoSlidingExpiration = TimeSpan.Zero;
+        const CacheItemPriority     CacheItemPriorityMin = CacheItemPriority.Low;
+        const CacheItemPriority     CacheItemPriorityMax = CacheItemPriority.NotRemovable;
+        static readonly TimeSpan    OneYear = new TimeSpan(365, 0, 0, 0);
+
+
+        internal enum EntryState : byte {
+            NotInCache         = 0x00,  // Created but not in hashtable
+            AddingToCache      = 0x01,  // In hashtable only
+            AddedToCache       = 0x02,  // In hashtable + expires + usage
+            RemovingFromCache  = 0x04,  // Removed from hashtable only
+            RemovedFromCache   = 0x08,  // Removed from hashtable & expires & usage
+            Closed             = 0x10, 
+        }
+
+        const byte EntryStateMask   = 0x1f;
+//        protected const byte BitPublic = 0x20;
+
+        // item
+        object                      _value;                 /* value */
+        DateTime                    _utcCreated;            /* creation date */
+
+
+        // expiration
+        DateTime                    _utcExpires;            /* when this item expires */
+        TimeSpan                    _slidingExpiration;     /* expiration interval */
+        byte                        _expiresBucket;         /* index of the expiration list (bucket) */
+        ExpiresEntryRef             _expiresEntryRef;       /* ref into the expiration list */
+
+        // usage
+        byte                        _usageBucket;           /* index of the usage list (== priority-1) */
+        UsageEntryRef               _usageEntryRef;         /* ref into the usage list */
+        DateTime                    _utcLastUpdate;         /* time we last updated usage */
+
+        // dependencies
+        CacheDependency             _dependency;            /* dependencies this item has */
+        object                      _onRemovedTargets;      /* targets of OnRemove notification */
+
+        /*
+         * ctor.
+         */
+
+        internal CacheEntry(
+                   String                   key, 
+                   Object                   value, 
+                   CacheDependency          dependency,
+                   CacheItemRemovedCallback onRemovedHandler,
+                   DateTime                 utcAbsoluteExpiration,              
+                   TimeSpan                 slidingExpiration,      
+                   CacheItemPriority        priority,
+                   bool                     isPublic) : 
+
+                base(key, isPublic) {
+
+            if (value == null) {
+                throw new ArgumentNullException("value");
+            }
+
+            if (slidingExpiration < TimeSpan.Zero || OneYear < slidingExpiration) {
+                throw new ArgumentOutOfRangeException("slidingExpiration");
+            }
+
+            if (utcAbsoluteExpiration != Cache.NoAbsoluteExpiration && slidingExpiration != Cache.NoSlidingExpiration) {
+                throw new ArgumentException(SR.GetString(SR.Invalid_expiration_combination));
+            }
+
+            if (priority < CacheItemPriorityMin || CacheItemPriorityMax < priority) {
+                throw new ArgumentOutOfRangeException("priority");
+            }
+
+            _value = value;
+            _dependency = dependency;
+            _onRemovedTargets = onRemovedHandler;
+
+            _utcCreated = DateTime.UtcNow;
+            _slidingExpiration = slidingExpiration;
+            if (_slidingExpiration > TimeSpan.Zero) {
+                _utcExpires = _utcCreated + _slidingExpiration;
+            }
+            else {
+                _utcExpires = utcAbsoluteExpiration;
+            } 
+
+            _expiresEntryRef = ExpiresEntryRef.INVALID;
+            _expiresBucket = 0xff;
+
+            _usageEntryRef = UsageEntryRef.INVALID;
+            if (priority == CacheItemPriority.NotRemovable) {
+                _usageBucket = 0xff;
+            }
+            else {
+                _usageBucket = (byte) (priority - 1);
+            }
+        }
+
+        internal Object Value {
+            get {return _value;}
+        }
+
+        internal DateTime UtcCreated {
+            get {return _utcCreated;}
+        }
+
+        internal EntryState State {
+            get { return (EntryState) (_bits & EntryStateMask); }
+            set { _bits = (byte) (((uint) _bits & ~(uint)EntryStateMask) | (uint) value); }
+        }
+
+        internal DateTime UtcExpires {
+            get {return _utcExpires;}
+            set {_utcExpires = value;}
+        }
+
+        internal TimeSpan SlidingExpiration {
+            get {return _slidingExpiration;}
+        }
+
+        internal byte ExpiresBucket {
+            get {return _expiresBucket;}
+            set {_expiresBucket = value;}
+        }
+
+        internal ExpiresEntryRef ExpiresEntryRef {
+            get {return _expiresEntryRef;}
+            set {_expiresEntryRef = value;}
+        }
+
+        internal bool HasExpiration() {
+            return _utcExpires < DateTime.MaxValue;
+        }
+
+        internal bool InExpires() {
+            return !_expiresEntryRef.IsInvalid;
+        }
+
+        internal byte UsageBucket {
+            get {return _usageBucket;}
+        }
+
+        internal UsageEntryRef UsageEntryRef {
+            get {return _usageEntryRef;}
+            set {_usageEntryRef = value;}
+        }
+
+        internal DateTime UtcLastUsageUpdate {
+            get {return _utcLastUpdate;}
+            set {_utcLastUpdate = value;}
+        }
+
+        internal bool HasUsage() {
+            return _usageBucket != 0xff;
+        }
+
+        internal bool InUsage() {
+            return !_usageEntryRef.IsInvalid;
+        }
+
+        internal CacheDependency Dependency {
+            get {return _dependency;}
+        }
+
+        internal void MonitorDependencyChanges() {
+            // need to protect against the item being closed
+            CacheDependency dependency = _dependency;
+            if (dependency != null && State == EntryState.AddedToCache) {
+                if (!dependency.Use()) {
+                    throw new InvalidOperationException(
+                            SR.GetString(SR.Cache_dependency_used_more_that_once));
+                }
+
+                dependency.SetCacheDependencyChanged(this);
+            }
+        }
+
+        /*
+         * The entry has changed, so remove ourselves from the cache.
+         */
+        void ICacheDependencyChanged.DependencyChanged(Object sender, EventArgs e) {
+            if (State == EntryState.AddedToCache) {
+                HttpRuntime.CacheInternal.Remove(this, CacheItemRemovedReason.DependencyChanged);
+            }
+        }
+
+        /*
+         * Helper to call the on-remove callback
+         */
+
+        private void CallCacheItemRemovedCallback(CacheItemRemovedCallback callback, CacheItemRemovedReason reason) {
+            if (IsPublic) {
+                try {
+                    // for public need to impersonate if called outside of request context
+                    if (HttpContext.Current == null) {
+                        using (new ApplicationImpersonationContext()) {
+                            callback(_key, _value, reason);
+                        }
+                    }
+                    else {
+                        callback(_key, _value, reason);
+                    }
+                }
+                catch (Exception e) {
+                    // for public need to report application error
+                    HttpApplicationFactory.RaiseError(e);
+
+                    try {
+                        WebBaseEvent.RaiseRuntimeError(e, this);
+                    }
+                    catch {
+                    }
+                }
+            }
+            else {
+                // for private items just make the call and eat any exceptions
+                try {
+                    using (new ApplicationImpersonationContext()) {
+                        callback(_key, _value, reason);
+                    }
+                }
+                catch {
+                }
+            }
+        }
+
+        /*
+         * Close the item to complete its removal from cache.
+         * 
+         * @param reason The reason the item is removed.
+         */
+        internal void Close(CacheItemRemovedReason reason) {
+            Debug.Assert(State == EntryState.RemovedFromCache, "State == EntryState.RemovedFromCache");
+            State = EntryState.Closed;
+
+            object      onRemovedTargets = null;
+            object[]    targets = null;
+
+            lock (this) {
+                if (_onRemovedTargets != null) {
+                    onRemovedTargets = _onRemovedTargets;
+                    if (onRemovedTargets is Hashtable) {
+                        ICollection col = ((Hashtable) onRemovedTargets).Keys;
+                        targets = new object[col.Count];
+                        col.CopyTo(targets, 0);
+                    }
+                }
+            }
+
+            if (onRemovedTargets != null) {
+                if (targets != null) {
+                    foreach (object target in targets) {
+                        if (target is CacheDependency) {
+                            ((CacheDependency)target).ItemRemoved();
+                        }
+                        else {
+                            CallCacheItemRemovedCallback((CacheItemRemovedCallback) target, reason);
+                        }
+                    }
+                }
+                else if (onRemovedTargets is CacheItemRemovedCallback) {
+                    CallCacheItemRemovedCallback((CacheItemRemovedCallback) onRemovedTargets, reason);
+                }
+                else {
+                    ((CacheDependency) onRemovedTargets).ItemRemoved();
+                }
+            }
+
+            if (_dependency != null) {
+                _dependency.DisposeInternal();
+            }
+        }
+
+#if DBG
+        internal /*public*/ string DebugDescription(string indent) {
+            StringBuilder sb = new StringBuilder();
+            String      nlindent = "\n" + indent + "    ";
+
+            sb.Append(indent + "CacheItem");
+            sb.Append(nlindent); sb.Append("_key=");        sb.Append(_key);
+            sb.Append(nlindent); sb.Append("_value=");      sb.Append(Debug.GetDescription(_value, indent));
+            sb.Append(nlindent); sb.Append("_utcExpires="); sb.Append(Debug.FormatUtcDate(_utcExpires));
+            sb.Append(nlindent); sb.Append("_bits=0x");     sb.Append(((int)_bits).ToString("x", CultureInfo.InvariantCulture));
+            sb.Append("\n");
+
+            return sb.ToString();
+        }
+#endif
+
+        internal void AddCacheDependencyNotify(CacheDependency dependency) {
+            lock (this) {
+                if (_onRemovedTargets == null) {
+                    _onRemovedTargets = dependency;
+                }
+                else if (_onRemovedTargets is Hashtable) {
+                    Hashtable h = (Hashtable) _onRemovedTargets;
+                    h[dependency] = dependency;
+                }
+                else {
+                    Hashtable h = new Hashtable(2);
+                    h[_onRemovedTargets] = _onRemovedTargets;
+                    h[dependency] = dependency;
+                    _onRemovedTargets = h;
+                }
+            }
+        }
+
+        internal void RemoveCacheDependencyNotify(CacheDependency dependency) {
+            lock (this) {
+                if (_onRemovedTargets != null) {
+                    if (_onRemovedTargets == dependency) {
+                        _onRemovedTargets = null;
+                    }
+                    else {
+                        // We assume the dependency must exist, so we don't need
+                        // to test for a cast.
+                        Hashtable h = (Hashtable) _onRemovedTargets;
+                        h.Remove(dependency);
+                        if (h.Count == 0) {
+                            _onRemovedTargets = null;
+                        }
+                    }
+                }
+            }
+        }
+
+#if USE_MEMORY_CACHE
+        internal CacheItemRemovedCallback CacheItemRemovedCallback {
+            get {
+                CacheItemRemovedCallback callback = null;
+                lock (this) {
+                    if (_onRemovedTargets != null) {
+                        if (_onRemovedTargets is Hashtable) {
+                            foreach (DictionaryEntry e in (Hashtable)_onRemovedTargets) {
+                                callback = e.Value as CacheItemRemovedCallback;
+                                break;
+                            }
+                        }
+                        else {
+                            callback = _onRemovedTargets as CacheItemRemovedCallback;   
+                        }
+                    }
+                }
+                return callback;
+            }
+        }
+#endif
+    }
+}

mcs/class/referencesource/System.Web/Cache/DependencyChangeMonitor.cs

@@ -0,0 +1,50 @@
+// <copyright file="DependencyChangeMonitor.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+#if USE_MEMORY_CACHE
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.Caching;
+using System.Web.Util;
+
+namespace System.Web.Caching {
+    internal sealed class DependencyChangeMonitor: ChangeMonitor, ICacheDependencyChanged {
+        private CacheDependency _dependency;
+        
+        public override string UniqueId { 
+            get {
+                return _dependency.GetUniqueID();
+            }
+        }
+
+        internal DependencyChangeMonitor(CacheDependency dependency) {
+            if (dependency == null) {
+                throw new ArgumentNullException("dependency");
+            }
+            if (!dependency.Use()) {
+                throw new InvalidOperationException(
+                    SR.GetString(SR.Cache_dependency_used_more_that_once));
+            }
+            _dependency = dependency;
+            _dependency.SetCacheDependencyChanged(this);
+            if (_dependency.HasChanged) {
+                OnChanged(null);
+            }
+            InitializationComplete();
+        }
+
+        void ICacheDependencyChanged.DependencyChanged(Object sender, EventArgs e) {
+            OnChanged(null);
+        }
+
+        [SuppressMessage("Microsoft.Usage", "CA2215:DisposeMethodsShouldCallBaseClassDispose", Justification="suppressed because fxcop is suffering from despotism")]
+        protected override void Dispose(bool disposing) {
+            if (disposing) {
+                if (_dependency != null) {
+                    _dependency.DisposeInternal();
+                }
+            }
+        }
+    }
+}
+#endif

mcs/class/referencesource/System.Web/Cache/FileResponseElement.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Security.Permissions;
+using System.Web;
+using System.Web.Caching;
+
+namespace System.Web.Caching {
+    [Serializable]
+    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Unrestricted)]
+    public class FileResponseElement: ResponseElement {
+        private  String               _path;
+        private  long                 _offset;
+        private  long                 _length;
+
+        public   String               Path     { get { return _path; } }
+        public   long                 Offset   { get { return _offset; } }
+        public   long                 Length   { get { return _length; } }
+
+        private FileResponseElement() { } // hide default constructor
+
+        public FileResponseElement(String path, long offset, long length) {
+            if (path == null)
+                throw new ArgumentNullException("path");
+            if (offset < 0)
+                throw new ArgumentOutOfRangeException("offset");
+            if (length < 0)
+                throw new ArgumentOutOfRangeException("length");
+
+            _path = path;
+            _offset = offset;
+            _length = length;
+        }
+    }
+}

mcs/class/referencesource/System.Web/Cache/HeaderElement.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Security.Permissions;
+using System.Web;
+using System.Web.Caching;
+
+namespace System.Web.Caching {
+    // A header element holds the header name and value.
+    [Serializable]
+    public sealed class HeaderElement {
+        private  string                     _name;
+        private  string                     _value;
+
+        public   string                     Name    { get { return _name; } }
+        public   string                     Value   { get { return _value; } }
+
+        private HeaderElement() { } // hide default constructor
+
+        public HeaderElement(string name, string value) {
+            if (name == null)
+                throw new ArgumentNullException("name");
+            if (value == null)
+                throw new ArgumentNullException("value");
+
+            _name = name;
+            _value = value;
+        }
+    }
+}

mcs/class/referencesource/System.Web/Cache/IOutputCacheEntry.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Security.Permissions;
+using System.Web;
+
+namespace System.Web.Caching {
+    public interface IOutputCacheEntry {
+
+        [SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly", Justification = "This can be set by the user to support inline dictionary intializers")]
+        List<HeaderElement>        HeaderElements    { get; set; }
+
+        [SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly", Justification = "This can be set by the user to support inline dictionary intializers")]
+        List<ResponseElement>      ResponseElements  { get; set; }
+    }
+}
+

mcs/class/referencesource/System.Web/Cache/MemCache.cs

@@ -0,0 +1,198 @@
+// <copyright file="MemCache.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+#if USE_MEMORY_CACHE
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Globalization;
+using System.Security;
+using System.Security.Permissions;
+using System.Reflection;
+using System.Runtime.Caching;
+using System.Text;
+using System.Web.Configuration;
+using System.Web.Util;
+
+namespace System.Web.Caching {
+    internal sealed class MemCache: CacheInternal {
+        private volatile bool _inited;
+        private static object _initLock = new object();
+        private MemoryCache _cacheInternal;
+        private MemoryCache _cachePublic;
+        private volatile bool _disposed;
+
+        internal MemCache(CacheCommon cacheCommon) : base(cacheCommon) {
+            // config initialization is done by Init.
+            Assembly asm = Assembly.Load("System.Runtime.Caching, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL");
+            Type t = asm.GetType("System.Runtime.Caching.MemoryCache", true, false);
+            _cacheInternal = HttpRuntime.CreateNonPublicInstance(t, new object[] {"asp_icache", null, true}) as MemoryCache;
+            _cachePublic = HttpRuntime.CreateNonPublicInstance(t, new object[] {"asp_pcache", null, true}) as MemoryCache;
+        }
+
+        protected override void Dispose(bool disposing) {
+            try {
+                _disposed = true;
+                if (disposing) {
+                    if (_cacheInternal != null) {
+                        _cacheInternal.Dispose();
+                    }
+                    if (_cachePublic != null) {
+                        _cachePublic.Dispose();
+                    }
+                }
+            }
+            finally {
+                base.Dispose(disposing);
+            }
+        }
+
+        internal override int PublicCount {
+            get { 
+                return (_cachePublic != null) ? (int)_cachePublic.GetCount() : 0;
+            }
+        }
+
+        internal override long TotalCount {
+            get {
+                long internalCount = (_cacheInternal != null) ? _cacheInternal.GetCount(null) : 0;
+                return internalCount + PublicCount;
+            }
+        }
+
+        internal void Init(CacheSection cacheSection) {
+            if (_inited) {
+                return;
+            }
+            
+            lock (_initLock) {
+                if (_inited) {
+                    return;
+                }
+                
+                NameValueCollection config = null;
+                if (cacheSection != null) {
+                    //_enableMemoryCollection = (!cacheSection.DisableMemoryCollection);
+                    //_enableExpiration = (!cacheSection.DisableExpiration);
+                    int physicalMemoryLimitPercentage = cacheSection.PercentagePhysicalMemoryUsedLimit;
+                    long cacheMemoryLimitMegabytes = cacheSection.PrivateBytesLimit << 20;
+                    TimeSpan pollingInterval = cacheSection.PrivateBytesPollTime;
+                    config = new NameValueCollection(3);
+                    config["physicalMemoryLimitPercentage"] = physicalMemoryLimitPercentage.ToString(CultureInfo.InvariantCulture);
+                    config["cacheMemoryLimitMegabytes"] = cacheMemoryLimitMegabytes.ToString(CultureInfo.InvariantCulture);
+                    config["pollingInterval"] = pollingInterval.ToString();
+                }
+
+                Type t = _cacheInternal.GetType();
+
+                t.InvokeMember("UpdateConfig",
+                               BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.InvokeMethod, 
+                               null, // binder
+                               _cacheInternal, // target
+                               new object[] {config}, // args
+                               CultureInfo.InvariantCulture);
+                t.InvokeMember("UpdateConfig",
+                               BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.InvokeMethod, 
+                               null, // binder
+                               _cachePublic, // target
+                               new object[] {config}, // args
+                               CultureInfo.InvariantCulture);
+
+                _inited = true;
+            }
+        }
+
+        // return enumerator for public entries
+        internal override IDictionaryEnumerator CreateEnumerator() {
+            return (IDictionaryEnumerator)((IEnumerable)_cachePublic).GetEnumerator();
+        }
+
+        internal CacheEntryChangeMonitor CreateCacheEntryChangeMonitor(IEnumerable<String> keys, bool isPublic) {
+            return (isPublic) ? _cachePublic.CreateCacheEntryChangeMonitor(keys, null) : _cacheInternal.CreateCacheEntryChangeMonitor(keys, null);
+        }
+
+        private CacheItemPolicy GetPolicy(CacheEntry newEntry) {
+            CacheItemPolicy policy = new CacheItemPolicy();
+            policy.SlidingExpiration = newEntry.SlidingExpiration;
+            if (policy.SlidingExpiration == ObjectCache.NoSlidingExpiration) {
+                policy.AbsoluteExpiration = (newEntry.UtcExpires != Cache.NoAbsoluteExpiration) ? newEntry.UtcExpires : ObjectCache.InfiniteAbsoluteExpiration;
+            }
+            if (newEntry.Dependency != null) {
+                policy.ChangeMonitors.Add(new DependencyChangeMonitor(newEntry.Dependency));
+            }
+            policy.Priority = (newEntry.UsageBucket == 0xff) ? System.Runtime.Caching.CacheItemPriority.NotRemovable : System.Runtime.Caching.CacheItemPriority.Default;
+            CacheItemRemovedCallback callback = newEntry.CacheItemRemovedCallback;
+            if (callback != null) {
+                policy.RemovedCallback = (new RemovedCallback(callback)).CacheEntryRemovedCallback;
+            }            
+            return policy;
+        }
+
+        internal override CacheEntry UpdateCache(CacheKey cacheKey,
+                                                 CacheEntry newEntry,
+                                                 bool replace,
+                                                 CacheItemRemovedReason removedReason,
+                                                 out object valueOld) {
+            valueOld = null;
+            CacheEntry entry = null;
+            string key = cacheKey.Key;
+            bool isPublic = cacheKey.IsPublic;
+            if (_disposed) {
+                return null;
+            }
+
+            MemoryCache cache = (isPublic) ? _cachePublic : _cacheInternal;
+            if (newEntry == null && !replace) {
+                // get
+                object o = cache.Get(key);
+                if (o != null) {
+                    entry = new CacheEntry(key, o, null, null, 
+                                           Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,
+                                           CacheItemPriority.Default, isPublic);
+                    entry.State = CacheEntry.EntryState.AddedToCache;
+                }
+            }
+            else if (newEntry != null && replace) {
+                // set
+                try {
+                }
+                finally {
+                    // prevent ThreadAbortEx from interrupting these calls
+                    CacheItemPolicy policy = GetPolicy(newEntry);
+                    cache.Set(key, newEntry.Value, policy);
+                }
+            }
+            else if (newEntry != null && !replace) {
+                // add
+                try {
+                }
+                finally {
+                    // prevent ThreadAbortEx from interrupting these calls
+                    CacheItemPolicy policy = GetPolicy(newEntry);
+                    Object o = cache.AddOrGetExisting(key, newEntry.Value, policy);
+                    if (o != null) {
+                        entry = new CacheEntry(key, o, null, null, 
+                                               Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,
+                                               CacheItemPriority.Default, isPublic);
+                        entry.State = CacheEntry.EntryState.AddedToCache;
+                    }
+                }
+            }
+            else {
+                // remove
+                valueOld = cache.Remove(key);
+            }
+            return entry;
+        }
+
+        internal override long TrimIfNecessary(int percent) {
+            return _cachePublic.Trim(percent) + _cacheInternal.Trim(percent);            
+        }
+
+        internal override void EnableExpirationTimer(bool enable) {
+            // This is done by Dispose, so it's a no-op here
+        }
+    }
+}
+#endif

mcs/class/referencesource/System.Web/Cache/MemoryResponseElement.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Security.Permissions;
+using System.Web;
+using System.Web.Caching;
+
+namespace System.Web.Caching {
+    [Serializable]
+    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Unrestricted)]
+    public class MemoryResponseElement: ResponseElement {
+        private  byte[]               _buffer;
+        private  long                 _length;
+
+        public   byte[]               Buffer   { get { return _buffer; } }
+        public   long                 Length   { get { return _length; } }
+
+        private MemoryResponseElement() { } // hide default constructor
+
+        public MemoryResponseElement(byte[] buffer, long length) {
+            if (buffer == null)
+                throw new ArgumentNullException("buffer");
+            if (length < 0 || length > buffer.Length)
+                throw new ArgumentOutOfRangeException("length");
+
+            _buffer = buffer;
+            _length = length;
+        }
+    }
+}

mcs/class/referencesource/System.Web/Cache/OutputCacheEntry.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Security.Permissions;
+using System.Web;
+
+namespace System.Web.Caching {
+    [Serializable]
+    internal class OutputCacheEntry: IOutputCacheEntry {
+        // fields that hold metadata for the entry
+        private Guid                      _cachedVaryId;
+        private HttpCachePolicySettings   _settings;
+        private string                    _kernelCacheUrl;
+        private string                    _dependenciesKey;
+        private string[]                  _dependencies; // file dependencies
+
+        //response fields
+        private int                       _statusCode;
+        private String                    _statusDescription;
+        private List<HeaderElement>       _headerElements;
+        private List<ResponseElement>     _responseElements;
+
+        internal Guid                    CachedVaryId      { get { return _cachedVaryId; } }
+        internal HttpCachePolicySettings Settings          { get { return _settings; } }
+        internal string                  KernelCacheUrl    { get { return _kernelCacheUrl; } }
+        internal string                  DependenciesKey   { get { return _dependenciesKey; } }
+        internal string[]                Dependencies      { get { return _dependencies; } }
+        internal int                     StatusCode        { get { return _statusCode; } }
+        internal string                  StatusDescription { get { return _statusDescription; } }
+
+        public   List<HeaderElement>     HeaderElements    { get { return _headerElements; } 
+                                                             set { _headerElements = value; } }
+
+        public   List<ResponseElement>   ResponseElements  { get { return _responseElements; }
+                                                             set { _responseElements = value; } }
+
+        private OutputCacheEntry() {
+            // hide default constructor
+        }
+        
+        internal OutputCacheEntry(Guid cachedVaryId,
+                                  HttpCachePolicySettings settings,
+                                  string kernelCacheUrl,
+                                  string dependenciesKey,
+                                  string[] dependencies,
+                                  int statusCode,
+                                  string statusDescription,
+                                  List<HeaderElement> headerElements,
+                                  List<ResponseElement> responseElements) {
+            _cachedVaryId = cachedVaryId;
+            _settings = settings;
+            _kernelCacheUrl = kernelCacheUrl;
+            _dependenciesKey = dependenciesKey;
+            _dependencies = dependencies;
+            _statusCode = statusCode;
+            _statusDescription = statusDescription;
+            _headerElements = headerElements;
+            _responseElements = responseElements;            
+        }
+    }
+}

mcs/class/referencesource/System.Web/Cache/OutputCacheProvider.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Configuration.Provider;
+using System.Security.Permissions;
+using System.Web;
+
+namespace System.Web.Caching {
+    // the abstract base class implemented by all output cache providers
+    public abstract class OutputCacheProvider: ProviderBase {
+        // Returns the specified entry, or null if it does not exist.
+        public abstract Object Get(String key);
+        // Inserts the specified entry into the cache if it does not already exist, otherwise returns the existing entry.
+        public abstract Object Add(String key, Object entry, DateTime utcExpiry);
+        // Inserts the specified entry into the cache, overwriting an existing entry if present.
+        public abstract void Set(String key, Object entry, DateTime utcExpiry);
+        // Removes the specified entry from the cache.
+        public abstract void Remove(String key);
+    }
+}

mcs/class/referencesource/System.Web/Cache/OutputCacheProviderCollection.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Configuration.Provider;
+using System.Security.Permissions;
+using System.Web;
+
+namespace System.Web.Caching {
+    public sealed class OutputCacheProviderCollection : ProviderCollection {
+
+        new public OutputCacheProvider this[string name] {
+            get {
+                return (OutputCacheProvider) base[name];
+            }
+        }
+        
+        public override void Add(ProviderBase provider) {
+            if (provider == null) {
+                throw new ArgumentNullException( "provider" );
+            }
+            
+            if (!(provider is OutputCacheProvider)) {
+                throw new ArgumentException(SR.GetString(SR.Provider_must_implement_type, typeof(OutputCacheProvider).Name),
+                                            "provider");
+            }
+            
+            base.Add(provider);
+        }
+        
+        public void CopyTo(OutputCacheProvider[] array, int index) {
+            base.CopyTo(array, index);
+        }
+    }
+}

mcs/class/referencesource/System.Web/Cache/RemovedCallback.cs

@@ -0,0 +1,41 @@
+// <copyright file="RemovedCallback.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+#if USE_MEMORY_CACHE
+using System;
+using System.Runtime.Caching;
+using System.Web.Util;
+
+namespace System.Web.Caching {
+    internal sealed class RemovedCallback {
+        CacheItemRemovedCallback _callback;
+        internal RemovedCallback(CacheItemRemovedCallback callback) {
+            _callback = callback;
+        }
+
+        internal void CacheEntryRemovedCallback(CacheEntryRemovedArguments arguments) {
+            string key = arguments.CacheItem.Key;
+            object value = arguments.CacheItem.Value;
+            CacheItemRemovedReason reason;
+            switch (arguments.RemovedReason) {
+                case CacheEntryRemovedReason.Removed :
+                    reason = CacheItemRemovedReason.Removed;
+                    break;
+                case CacheEntryRemovedReason.Expired :
+                    reason = CacheItemRemovedReason.Expired;
+                    break;
+                case CacheEntryRemovedReason.Evicted :
+                    reason = CacheItemRemovedReason.Underused;
+                    break;
+                case CacheEntryRemovedReason.ChangeMonitorChanged :
+                    reason = CacheItemRemovedReason.DependencyChanged;
+                    break;
+                default :
+                    reason = CacheItemRemovedReason.Removed;
+                    break;
+            }
+            _callback(key, value, reason);
+        }
+    }
+}
+#endif

mcs/class/referencesource/System.Web/Cache/ResponseElement.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Security.Permissions;
+using System.Web;
+using System.Web.Caching;
+
+namespace System.Web.Caching {
+    [Serializable]
+    public abstract class ResponseElement {
+    }
+}

mcs/class/referencesource/System.Web/Cache/SRef.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Reflection;
+using System.Security.Permissions;
+using System.Web;
+
+namespace System.Web.Caching {
+    internal class SRef {
+        private static Type s_type = Type.GetType("System.SizedReference", true, false);
+        private Object _sizedRef;
+        
+        internal SRef(Object target) {
+            _sizedRef = HttpRuntime.CreateNonPublicInstance(s_type, new object[] {target});
+        }
+        
+        internal long ApproximateSize {
+            [PermissionSet(SecurityAction.Assert, Unrestricted=true)]
+            get {
+                object o = s_type.InvokeMember("ApproximateSize",
+                                               BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, 
+                                               null, // binder
+                                               _sizedRef, // target
+                                               null, // args
+                                               CultureInfo.InvariantCulture);
+                return (long) o;
+            }
+        }
+        
+        [PermissionSet(SecurityAction.Assert, Unrestricted=true)]
+        internal void Dispose() {
+            s_type.InvokeMember("Dispose",
+                                BindingFlags.Public | BindingFlags.Instance | BindingFlags.InvokeMethod, 
+                                null, // binder
+                                _sizedRef, // target
+                                null, // args
+                                CultureInfo.InvariantCulture);
+        }
+    }
+
+    internal class SRefMultiple {
+        private List<SRef> _srefs = new List<SRef>();
+
+        internal void AddSRefTarget(Object o) {
+            _srefs.Add(new SRef(o));
+        }
+
+        internal long ApproximateSize {
+            [PermissionSet(SecurityAction.Assert, Unrestricted = true)]
+            get {
+                return _srefs.Sum(s => s.ApproximateSize);
+            }
+        }
+
+        [PermissionSet(SecurityAction.Assert, Unrestricted = true)]
+        internal void Dispose() {
+            foreach (SRef s in _srefs) {
+                s.Dispose();
+            }
+        }
+    }
+}

mcs/class/referencesource/System.Web/Cache/SubstitutionResponseElement.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Runtime.Serialization;
+using System.Security.Permissions;
+using System.Web;
+using System.Web.Caching;
+using System.Web.Compilation;
+
+namespace System.Web.Caching {
+    [Serializable]
+    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Unrestricted)]
+    public class SubstitutionResponseElement: ResponseElement {
+        [NonSerialized]
+        private  HttpResponseSubstitutionCallback _callback;
+        private  string                           _targetTypeName;
+        private  string                           _methodName;
+
+        public   HttpResponseSubstitutionCallback Callback   { get { return _callback; } }
+
+        private SubstitutionResponseElement() { } // hide default constructor
+
+        public SubstitutionResponseElement(HttpResponseSubstitutionCallback callback) {
+            if (callback == null)
+                throw new ArgumentNullException("callback");
+
+            _callback = callback;
+        }
+
+        [OnSerializing()]
+        private void OnSerializingMethod(StreamingContext context) {
+            // create a string representation of the callback
+            _targetTypeName = System.Web.UI.Util.GetAssemblyQualifiedTypeName(_callback.Method.ReflectedType);
+            _methodName = _callback.Method.Name;
+        }
+
+        [OnDeserialized()]
+        private void OnDeserializedMethod(StreamingContext context) {
+            // re-create each ValidationCallbackInfo from its string representation
+            Type target = BuildManager.GetType(_targetTypeName, true /*throwOnFail*/, false /*ignoreCase*/);
+            _callback = (HttpResponseSubstitutionCallback) Delegate.CreateDelegate(typeof(HttpResponseSubstitutionCallback), target, _methodName);
+        }
+    }
+}