/// <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">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="tags">
/// A variable-length parameters list containing tags to expire cached
/// entries.
/// </param>
/// <returns>The result of the query.</returns>
public static T FromCache <T>(this QueryDeferred <T> query, DateTimeOffset absoluteExpiration, params string[] tags)
{
var key = QueryCacheManager.GetCacheKey(query, tags);
var item = QueryCacheManager.Cache.Get(key);
if (item == null)
{
item = query.Execute();
item = QueryCacheManager.Cache.AddOrGetExisting(key, item ?? DBNull.Value, absoluteExpiration) ?? item;
QueryCacheManager.AddCacheTag(key, tags);
}
item = item.IfDbNullThenNull();
return((T)item);
}
public override void ExecuteInMemory()
{
if (InMemoryDeferredQuery != null)
{
_result = InMemoryDeferredQuery.Execute();
HasValue = true;
}
else
{
var enumerator = Query.GetEnumerator();
// Enumerate on first item only
enumerator.MoveNext();
_result = (TResult)enumerator.Current;
HasValue = true;
}
}
/// <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="options">The cache entry options to use to cache the query.</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 T FromCache <T>(this QueryDeferred <T> query, MemoryCacheEntryOptions options, params string[] tags)
{
var key = QueryCacheManager.GetCacheKey(query, tags);
object item;
if (!QueryCacheManager.Cache.TryGetValue(key, out item))
{
item = query.Execute();
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 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="tags">
/// A variable-length parameters list containing tags to expire cached
/// entries.
/// </param>
/// <returns>The result of the query.</returns>
public static Task <T> FromCacheAsync <T>(this QueryDeferred <T> query, MemoryCacheEntryOptions options, params string[] tags)
{
var key = QueryCacheManager.GetCacheKey(query, tags);
var result = Task.Run(() =>
{
object item;
if (!QueryCacheManager.Cache.TryGetValue(key, out item))
{
item = query.Execute();
item = QueryCacheManager.Cache.Set(key, item, options);
QueryCacheManager.AddCacheTag(key, tags);
}
return((T)item);
});
return(result);
}
/// <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="tags">
/// A variable-length parameters list containing tags to expire cached
/// entries.
/// </param>
/// <returns>The result of the query.</returns>
public static Task <T> FromCacheAsync <T>(this QueryDeferred <T> query, DateTimeOffset absoluteExpiration, params string[] tags)
{
var key = QueryCacheManager.GetCacheKey(query, tags);
var result = Task.Run(() =>
{
var item = QueryCacheManager.Cache.Get(key);
if (item == null)
{
item = query.Execute();
item = QueryCacheManager.Cache.AddOrGetExisting(key, item, absoluteExpiration) ?? item;
QueryCacheManager.AddCacheTag(key, tags);
}
return((T)item);
});
return(result);
}
/// <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="tags">
/// A variable-length parameters list containing tags to expire cached
/// entries.
/// </param>
/// <returns>The result of the query.</returns>
public static Task <T> FromCacheAsync <T>(this QueryDeferred <T> query, CacheItemPolicy policy, params string[] tags)
{
var key = QueryCacheManager.GetCacheKey(query, tags);
var result = Task.Run(() =>
{
var item = QueryCacheManager.Cache.Get(key);
if (item == null)
{
item = query.Execute();
item = QueryCacheManager.Cache.AddOrGetExisting(key, item ?? DBNull.Value, policy) ?? item;
QueryCacheManager.AddCacheTag(key, tags);
}
item = item.IfDbNullThenNull();
return((T)item);
});
return(result);
}
/// <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="policy">The policy to use to cache the query.</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 T FromCache <T>(this QueryDeferred <T> query, CacheItemPolicy policy, params string[] tags)
{
var key = QueryCacheManager.GetCacheKey(query, tags);
var item = QueryCacheManager.Cache.Get(key);
if (item == null)
{
item = query.Execute();
item = QueryCacheManager.Cache.AddOrGetExisting(key, item ?? DBNull.Value, policy) ?? item;
QueryCacheManager.AddCacheTag(key, tags);
}
else
{
if (item == DBNull.Value)
{
item = null;
}
}
return((T)item);
}
