Started implementing static cache provider for the application cache... centralizing static cache.

src/Umbraco.Core/Cache/StaticCacheProvider.cs

@@ -0,0 +1,102 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.RegularExpressions;
+using System.Web.Caching;
+
+namespace Umbraco.Core.Cache
+{
+    /// <summary>
+    /// A cache provider that statically caches everything in an in memory dictionary
+    /// </summary>
+    internal class StaticCacheProvider : CacheProviderBase
+    {
+        private readonly ConcurrentDictionary<string, object> _staticCache = new ConcurrentDictionary<string, object>();
+
+        public override void ClearAllCache()
+        {
+            _staticCache.Clear();
+        }
+
+        public override void ClearCacheItem(string key)
+        {
+            object val;
+            _staticCache.TryRemove(key, out val);
+        }
+
+        public override void ClearCacheObjectTypes(string typeName)
+        {
+            foreach (var key in _staticCache.Keys)
+            {
+                if (_staticCache[key] != null
+                    && _staticCache[key].GetType().ToString().InvariantEquals(typeName))
+                {
+                    object val;
+                    _staticCache.TryRemove(key, out val);
+                }
+            }
+        }
+
+        public override void ClearCacheObjectTypes<T>()
+        {
+            foreach (var key in _staticCache.Keys)
+            {
+                if (_staticCache[key] != null
+                    && _staticCache[key].GetType() == typeof(T))
+                {
+                    object val;
+                    _staticCache.TryRemove(key, out val);
+                }
+            }
+        }
+
+        public override void ClearCacheByKeySearch(string keyStartsWith)
+        {
+            foreach (var key in _staticCache.Keys)
+            {
+                if (key.InvariantStartsWith(keyStartsWith))
+                {
+                    ClearCacheItem(key);
+                }
+            }
+        }
+
+        public override void ClearCacheByKeyExpression(string regexString)
+        {
+            foreach (var key in _staticCache.Keys)
+            {
+                if (Regex.IsMatch(key, regexString))
+                {
+                    ClearCacheItem(key);
+                }
+            }
+        }
+
+        public override IEnumerable<T> GetCacheItemsByKeySearch<T>(string keyStartsWith)
+        {
+            return (from KeyValuePair<string, object> c in _staticCache
+                    where c.Key.InvariantStartsWith(keyStartsWith)
+                    select c.Value.TryConvertTo<T>()
+                    into attempt
+                    where attempt.Success
+                    select attempt.Result).ToList();
+        }
+
+        public override T GetCacheItem<T>(string cacheKey)
+        {
+            var result = _staticCache[cacheKey];
+            if (result == null)
+            {
+                return default(T);
+            }
+            return result.TryConvertTo<T>().Result;
+        }
+
+        public override T GetCacheItem<T>(string cacheKey, Func<T> getCacheItem)
+        {
+            return (T)_staticCache.GetOrAdd(cacheKey, getCacheItem);
+        }
+        
+    }
+}