/// <summary> /// Return the result of the <paramref name="query" /> from the cache. If the query is not cached /// yet, the query is materialized asynchronously and cached before being returned. /// </summary> /// <typeparam name="T">Generic type parameter.</typeparam> /// <param name="query">The query to cache in the QueryCacheManager.</param> /// <param name="absoluteExpiration">The fixed date and time at which the cache entry will expire.</param> /// <param name="cancellationToken">The cancellation token.</param> /// <param name="tags"> /// A variable-length parameters list containing tags to expire cached /// entries. /// </param> /// <returns>The result of the query.</returns> public static async Task <T> FromCacheAsync <T>(this QueryDeferred <T> query, DateTimeOffset absoluteExpiration, CancellationToken cancellationToken = default(CancellationToken), params string[] tags) { if (!QueryCacheManager.IsEnabled) { return(await query.ExecuteAsync(cancellationToken).ConfigureAwait(false)); } var key = QueryCacheManager.GetCacheKey(query, tags); var item = QueryCacheManager.GetDeferred(key); if (item == null) { using (var handler = new QueryCacheItemTracker().Initialize(query)) { item = await query.ExecuteAsync(cancellationToken).ConfigureAwait(false); item = QueryCacheManager.AddOrGetExistingDeferred <T>(key, item ?? DBNull.Value, absoluteExpiration) ?? item; QueryCacheManager.AddCacheTag(handler, key, tags); QueryCacheManager.AddCacheTag(key, typeof(T).Name + QueryCacheManager.CacheTypeSuffix); } } item = item.IfDbNullThenNull(); return((T)item); }
/// <summary> /// Return the result of the <paramref name="query" /> from the cache. If the query is not cached /// yet, the query is materialized and cached before being returned. /// </summary> /// <typeparam name="T">The generic type of the query.</typeparam> /// <param name="query">The query to cache in the QueryCacheManager.</param> /// <param name="options">The cache entry options to use to cache the query.</param> /// <param name="cancellationToken">The cancellation token.</param> /// <param name="tags"> /// A variable-length parameters list containing tags to expire cached /// entries. /// </param> /// <returns>The result of the query.</returns> public static async Task <T> FromCacheAsync <T>(this QueryDeferred <T> query, MemoryCacheEntryOptions options, CancellationToken cancellationToken = default(CancellationToken), params string[] tags) { if (!QueryCacheManager.IsEnabled) { return(await query.ExecuteAsync(cancellationToken).ConfigureAwait(false)); } var key = QueryCacheManager.GetCacheKey(query, tags); object item; if (!QueryCacheManager.Cache.TryGetValue(key, out item)) { item = await query.ExecuteAsync(cancellationToken).ConfigureAwait(false); item = QueryCacheManager.Cache.Set(key, item ?? DBNull.Value, options); QueryCacheManager.AddCacheTag(key, tags); } item = item.IfDbNullThenNull(); return((T)item); }
/// <summary> /// Return the result of the <paramref name="query" /> from the cache. If the query is not cached /// yet, the query is materialized asynchronously and cached before being returned. /// </summary> /// <typeparam name="T">Generic type parameter.</typeparam> /// <param name="query">The query to cache in the QueryCacheManager.</param> /// <param name="absoluteExpiration">The fixed date and time at which the cache entry will expire.</param> /// <param name="cancellationToken">The cancellation token.</param> /// <param name="tags"> /// A variable-length parameters list containing tags to expire cached /// entries. /// </param> /// <returns>The result of the query.</returns> public static async Task <T> FromCacheAsync <T>(this QueryDeferred <T> query, DateTimeOffset absoluteExpiration, CancellationToken cancellationToken = default(CancellationToken), params string[] tags) { if (!QueryCacheManager.IsEnabled) { return(await query.ExecuteAsync(cancellationToken).ConfigureAwait(false)); } var key = QueryCacheManager.GetCacheKey(query, tags); var item = QueryCacheManager.Cache.Get(key); if (item == null) { item = await query.ExecuteAsync(cancellationToken).ConfigureAwait(false); item = QueryCacheManager.Cache.AddOrGetExisting(key, item ?? DBNull.Value, absoluteExpiration) ?? item; QueryCacheManager.AddCacheTag(key, tags); } item = item.IfDbNullThenNull(); return((T)item); }
/// <summary> /// Return the result of the <paramref name="query" /> from the cache. If the query is not cached /// yet, the query is materialized asynchronously and cached before being returned. /// </summary> /// <typeparam name="T">The generic type of the query.</typeparam> /// <param name="query">The query to cache in the QueryCacheManager.</param> /// <param name="policy">The policy to use to cache the query.</param> /// <param name="cancellationToken">The cancellation token.</param> /// <param name="tags"> /// A variable-length parameters list containing tags to expire cached /// entries. /// </param> /// <returns>The result of the query.</returns> public static async Task <T> FromCacheAsync <T>(this QueryDeferred <T> query, CacheItemPolicy policy, CancellationToken cancellationToken = default(CancellationToken), params string[] tags) { var key = QueryCacheManager.GetCacheKey(query, tags); var item = QueryCacheManager.Cache.Get(key); if (item == null) { item = await query.ExecuteAsync(cancellationToken).ConfigureAwait(false); item = QueryCacheManager.Cache.AddOrGetExisting(key, item ?? DBNull.Value, policy) ?? item; QueryCacheManager.AddCacheTag(key, tags); } item = item.IfDbNullThenNull(); return((T)item); }