Beispiel #1
0
        private static string ExtractKeyFromExpression <TResult>(Expression <Func <TResult> > func)
        {
            string key;
            MethodCallExpression method = func.Body as MethodCallExpression;

            if (method == null)
            {
                throw new InvalidCachedFuncException("Body must be MethodCallExpression to auto generate a cache key");
            }

            key = CacheKeyGenerator.GenerateKey(method);
            return(key);
        }
Beispiel #2
0
        public static TResult FromCacheOrExecute <TResult>(FujiyBlogDatabase db, Expression <Func <TResult> > func, string key = null, MemoryCacheEntryOptions cacheItemPolicy = null, bool condition = true)
        {
            string lastDatabaseChangeAtDb = db.LastDatabaseChange;

            if (lastDatabaseChangeAtDb != lastDatabaseChange)
            {
                lastDatabaseChange = lastDatabaseChangeAtDb;
                ClearCache();
            }

            if (!condition)
            {
                return(func.Compile()());
            }

            if (func == null)
            {
                throw new ArgumentNullException("func");
            }

            if (string.IsNullOrEmpty(key))
            {
                MethodCallExpression method = func.Body as MethodCallExpression;

                if (method == null)
                {
                    throw new InvalidCachedFuncException("Body must be MethodCallExpression to auto generate a cache key");
                }

                key = CacheKeyGenerator.GenerateKey(method);
            }

            object returnObject = DefaultCache.Get(key);

            if (!(returnObject is TResult))
            {
                returnObject = func.Compile()();
                if (returnObject != null)
                {
                    DefaultCache.Set(key, returnObject, cacheItemPolicy);
                }
            }

            return((TResult)returnObject);
        }