public void TestLruPolicy()
{
var hundredBytes = new byte[100];
ICache cache = new MemoryCache(1000, new LruCacheEvictionPolicy(), 900, 700);
for(int i = 0; i < 9;i++)
{
cache.Insert("Entry " + i, hundredBytes, CachePriority.Normal);
Thread.Sleep(20);
}
// Cache size is now 900 bytes
cache.Insert("Entry 10", hundredBytes, CachePriority.Normal);
Assert.IsFalse(cache.ContainsKey("Entry 0"));
Assert.IsFalse(cache.ContainsKey("Entry 1"));
Assert.IsTrue(cache.ContainsKey("Entry 2"));
Assert.IsTrue(cache.ContainsKey("Entry 10"));
// Cache size should now be 800 bytes
cache.Lookup("Entry 2");
cache.Insert("Entry 11", hundredBytes, CachePriority.Normal);
cache.Insert("Entry 12", hundredBytes, CachePriority.Normal); // This insert should force eviction
Assert.IsFalse(cache.ContainsKey("Entry 0")); // was previously evicted
Assert.IsFalse(cache.ContainsKey("Entry 1")); // was previously evicted
Assert.IsTrue(cache.ContainsKey("Entry 2"), "Expected Entry2 to remain in cache after second eviction"); // Won't be evicted due to recent access
Assert.IsFalse(cache.ContainsKey("Entry 3")); // newly evicted
Assert.IsFalse(cache.ContainsKey("Entry 4")); // newly evicted
Assert.IsTrue(cache.ContainsKey("Entry 5"), "Expected Entry 5 to remain in cache after second eviction"); // shouldn't be evicted
Assert.IsTrue(cache.ContainsKey("Entry 11"), "Expected Entry 11 to remain in cache after second eviction"); // should have been added before eviction
Assert.IsTrue(cache.ContainsKey("Entry 12"), "Expected Entry 12 to be added to cache after second eviction"); // should have been added after eviction
}
public void TestQueryCacheInsertAndInvalidation()
{
var testCache = new MemoryCache(8192, new LruCacheEvictionPolicy());
var client = GetClient(testCache);
var storeName = "Client.TestQueryCacheInvalidation_" + DateTime.Now.Ticks;
client.CreateStore(storeName);
const string query = "SELECT ?s WHERE { ?s ?p ?o }";
client.ExecuteQuery(storeName, query);
var cacheKey = storeName + "_" + query.GetHashCode();
Assert.IsTrue(testCache.ContainsKey(cacheKey));
testCache.Insert(cacheKey, new CachedQueryResult(DateTime.UtcNow, "This is a test"), CachePriority.Normal);
var resultStream = client.ExecuteQuery(storeName, query);
string result;
using (var resultReader = new StreamReader(resultStream))
{
result = resultReader.ReadToEnd();
}
Assert.AreEqual("This is a test", result);
client.ExecuteTransaction(storeName, null, null,
"<http://example.org/s> <http://example.org/p> <http://example.org/o> .",
Constants.DefaultGraphUri, true);
resultStream = client.ExecuteQuery(storeName, query);
using (var resultReader = new StreamReader(resultStream))
{
result = resultReader.ReadToEnd();
}
// We should not get the test result we inserted into the cache this time.
Assert.AreNotEqual("This is a test", result);
// The cache should have been updated with the result received from the server.
var cacheResult = testCache.Lookup<CachedQueryResult>(cacheKey);
Assert.AreEqual(result, cacheResult.Result);
}
public void TestLruPriority()
{
var hundredBytes = new byte[100];
ICache cache = new MemoryCache(1000, new LruCacheEvictionPolicy(), 900, 700);
for (int i = 0; i < 9; i++)
{
cache.Insert("Entry " + i, hundredBytes, i%2 == 0 ? CachePriority.High : CachePriority.Normal);
Thread.Sleep(20);
}
// Cache size is now 900 bytes
cache.Insert("Entry 10", hundredBytes, CachePriority.High);
Assert.IsTrue(cache.ContainsKey("Entry 0"), "Expected Entry 0 to remain after first eviction");
Assert.IsFalse(cache.ContainsKey("Entry 1"), "Expected Entry 1 to be removed after first eviction");
Assert.IsTrue(cache.ContainsKey("Entry 2"), "Expected Entry 2 to remain after first eviction");
Assert.IsFalse(cache.ContainsKey("Entry 3"), "Expected Entry 3 to be removed after first eviction");
Assert.IsTrue(cache.ContainsKey("Entry 4"));
Assert.IsTrue(cache.ContainsKey("Entry 5"));
Assert.IsTrue(cache.ContainsKey("Entry 10"));
cache.Insert("Entry 11", hundredBytes, CachePriority.High);
cache.Insert("Entry 12", hundredBytes, CachePriority.High);
Assert.IsFalse(cache.ContainsKey("Entry 5"), "Expected Entry 5 to be removed after second eviction");
Assert.IsFalse(cache.ContainsKey("Entry 7"), "Expected Entry 7 to be removed after second eviction");
Assert.IsNotNull(cache.Lookup("Entry 2"));
cache.Insert("Entry 13", hundredBytes, CachePriority.High);
cache.Insert("Entry 14", hundredBytes, CachePriority.High);
Assert.IsFalse(cache.ContainsKey("Entry 0")); // Should now start evicting high priority items
Assert.IsTrue(cache.ContainsKey("Entry 2"), "Expected Entry 2 to remain after third eviction due to recent access");
Assert.IsFalse(cache.ContainsKey("Entry 4"), "Expected Entry 4 to be removed after third eviction");
}
public void TestTwoLevelCache()
{
var hundredBytes = new byte[100];
ICache primary = new MemoryCache(500, new LruCacheEvictionPolicy(), 400, 300);
ICache secondary = new MemoryCache(1000, new LruCacheEvictionPolicy(), 900, 700);
ICache cache = new TwoLevelCache(primary, secondary);
for (int i = 0; i < 9; i++)
{
cache.Insert("Entry " + i, hundredBytes, CachePriority.Normal);
Thread.Sleep(20);
}
for(int i = 0; i < 9; i++)
{
Assert.IsTrue(secondary.ContainsKey("Entry " + i), "Expected secondary cache to contain Entry {0} after initialization");
if (i < 5) Assert.IsFalse(primary.ContainsKey("Entry " + i), "Expected primary cache to NOT contain Entry {0} after initialization", i);
else Assert.IsTrue(primary.ContainsKey("Entry " + i), "Expected primary cache to contain Entry {0} after initialization", i);
}
cache.Insert("Entry 10", hundredBytes, CachePriority.Normal);
Assert.IsFalse(cache.ContainsKey("Entry 0"));
Assert.IsFalse(cache.ContainsKey("Entry 1"));
Assert.IsTrue(cache.ContainsKey("Entry 2"));
Assert.IsTrue(cache.ContainsKey("Entry 10"));
Assert.IsTrue(primary.ContainsKey("Entry 10"));
Assert.IsTrue(secondary.ContainsKey("Entry 10"));
}