/// <summary>
/// Executes the query represented by a specified expression tree to cache its results.
/// </summary>
/// <param name="expression">An expression tree that represents a LINQ query.</param>
/// <param name="materializer">How to run the query.</param>
/// <returns>The value that results from executing the specified query.</returns>
public object Materialize(Expression expression, Func <object> materializer)
{
var cacheKey = _cacheKeyProvider.GetEFCacheKey(
_query,
expression,
_efCachePolicy.KeyHashPrefix,
_efCachePolicy.SaltKey);
_debugInfo.EFCacheKey = cacheKey;
var queryCacheKey = cacheKey.KeyHash;
var result = _cacheServiceProvider.GetValue(queryCacheKey);
if (result != null)
{
_debugInfo.IsCacheHit = true;
return(result);
}
result = materializer();
_cacheServiceProvider.StoreRootCacheKeys(cacheKey.CacheDependencies);
if (_efCachePolicy.AbsoluteExpiration == null)
{
_efCachePolicy.AbsoluteExpiration = DateTime.Now.AddMinutes(20);
}
_cacheServiceProvider.InsertValue(
queryCacheKey,
result,
cacheKey.CacheDependencies,
_efCachePolicy.AbsoluteExpiration.Value,
_efCachePolicy.Priority);
return(result);
}
public void TestCacheInvalidationWithTwoRoots()
{
_cacheService.StoreRootCacheKeys(new[] { "entity1.model", "entity2.model" });
_cacheService.InsertValue("EF_key1", "value1", new[] { "entity1.model", "entity2.model" }, DateTime.Now.AddMinutes(10));
_cacheService.StoreRootCacheKeys(new[] { "entity1.model", "entity2.model" });
_cacheService.InsertValue("EF_key2", "value2", new[] { "entity1.model", "entity2.model" }, DateTime.Now.AddMinutes(10));
var value1 = _cacheService.GetValue("EF_key1");
Assert.IsNotNull(value1);
var value2 = _cacheService.GetValue("EF_key2");
Assert.IsNotNull(value2);
_cacheService.InvalidateCacheDependencies(new[] { "entity2.model" });
value1 = _cacheService.GetValue("EF_key1");
Assert.IsNull(value1);
value2 = _cacheService.GetValue("EF_key2");
Assert.IsNull(value2);
var keys = _cacheService.GetAllEFCachedKeys();
var key1 = keys.FirstOrDefault(key => key == "EF_key1");
Assert.IsNull(key1);
Assert.AreEqual(0, keys.Count);
}
