public void Put(DbCacheKey key, DbCacheEntry value, DbCachingPolicy policy)
{
var cacheKey = BuildKey(key.Key);
using (_cache.AcquireKeyLock(cacheKey))
{
_cache.Put(cacheKey, value, new CacheEntryOptions().ExpiresIn(policy.ExpirationTimeout.Value));
foreach (var set in key.EntitySets)
{
var lookup = GetLookupSet(set);
lookup.Add(cacheKey);
}
}
}
public virtual DbCacheKey GenerateQueryKey(Expression expression, DbCachingPolicy policy)
{
var hash = GetExpressionHash(expression);
var key = _keysCache.GetOrAdd(hash.CombinedHash, key =>
{
var visitor = new DependencyVisitor();
visitor.ExtractDependencies(expression);
return(new DbCacheKey
{
Key = hash.CombinedHashString,
EntitySets = visitor.Types.Select(x => GenerateDependencyKey(x)).ToArray()
});
});
return(key);
}
/// <summary>
/// Returns a new query where the result will be cached.
/// Only untracked entities will be cached.
/// </summary>
/// <typeparam name="T">The type of entity being queried.</typeparam>
/// <param name="source">The source query.</param>
/// <param name="options">Options how to handle cached query results.</param>
/// <returns>A new query where the result set will be cached.</returns>
public static IQueryable <T> AsCaching <T>(this IQueryable <T> source, [NotParameterized] DbCachingPolicy policy)
where T : BaseEntity
{
Guard.NotNull(source, nameof(source));
Guard.NotNull(policy, nameof(policy));
if (source.Provider is not CachingQueryProvider)
{
// The AsCaching() method expression will result in a LINQ translation error
// if ef caching is not active.
return(source);
}
return
(source.Provider.CreateQuery <T>(
Expression.Call(
instance: null,
method: AsCachingMethodInfo.MakeGenericMethod(typeof(T)),
arg0: source.Expression,
arg1: Expression.Constant(policy))));
}
public DbCacheEntry Get(DbCacheKey key, DbCachingPolicy policy)
{
return(_cache.Get <DbCacheEntry>(BuildKey(key.Key)));
}
