public void TestScavengingOfOldestAccessedItem()
{
const int MaxCacheItemCount = 200;
const decimal ScavengePercentage = 50;
ScavengedExpirableCacheStore cacheStore = new ScavengedExpirableCacheStore(new CacheOptions { ExpirationPollInterval = TimeSpan.FromMinutes(2), MaxCacheItemCount = MaxCacheItemCount, ScavengePercentage = ScavengePercentage });
for (int i = 0; i < 190; i++)
{
cacheStore.Set(new CacheItem(String.Format("key{0}", i), null, 0, null));
}
Thread.Sleep(100);
for (int i = 0; i < 100; i++)
{
Assert.IsNotNull(cacheStore.Get(String.Format("key{0}", i), false));
}
_ReflectivelyTriggerScavenging(cacheStore);
for (int i = 0; i < 100; i++)
{
Assert.IsNotNull(cacheStore.Get(String.Format("key{0}", i), false));
}
for (int i = 100; i < 190; i++)
{
Assert.IsNull(cacheStore.Get(String.Format("key{0}", i), false));
}
}
private void _CacheBombard(ScavengedExpirableCacheStore cacheStore, Random random)
{
object data = new object();
try
{
for (int i = 0; i < 500000; i++)
{
double dice = random.NextDouble();
if (dice <= 0.3)
{
cacheStore.Set(new CacheItem(TagCacheTestUtil.GetRandomKey(random), data, 0, null));
}
else if (dice <= 0.8)
{
cacheStore.Get(TagCacheTestUtil.GetRandomKey(random), false);
}
else
{
cacheStore.Remove(TagCacheTestUtil.GetRandomKey(random));
}
}
}
catch (Exception ex)
{
Assert.Fail(ex.ToString());
}
}
public void TestPriorityBasedScavenging()
{
const int MaxCacheItemCount = 1000;
const decimal ScavengePercentage = 50;
const int MaxItemsAfterScavenging = (int)(MaxCacheItemCount * ScavengePercentage / 100);
const int NumberOfItemsToInsert = MaxCacheItemCount + 1;
ScavengedExpirableCacheStore cacheStore = new ScavengedExpirableCacheStore(new CacheOptions { ExpirationPollInterval = TimeSpan.FromSeconds(1), MaxCacheItemCount = MaxCacheItemCount, ScavengePercentage = ScavengePercentage });
// insert with increasing priority
for (int i = 0; i < NumberOfItemsToInsert; i++)
{
CacheItem cacheItem = new CacheItem(String.Format("key{0}", i), null, i + 1, null);
cacheStore.Set(cacheItem);
}
Thread.Sleep(3000);
int cacheItemCount = cacheStore.CacheItemCount;
Assert.IsTrue(cacheItemCount == MaxItemsAfterScavenging, "scavenging did not occur as expected");
for (int i = 0; i < cacheItemCount; i++)
{
CacheItem cacheItem = cacheStore.Get(String.Format("key{0}", i), false);
Assert.IsNotNull(cacheItem, "cache item is expected to be present");
}
for (int i = cacheItemCount; i < NumberOfItemsToInsert; i++)
{
CacheItem cacheItem = cacheStore.Get(String.Format("key{0}", i), false);
Assert.IsNull(cacheItem, "cache item is expected to be absent");
}
// insert with max priority
for (int i = cacheItemCount; i < NumberOfItemsToInsert; i++)
{
CacheItem cacheItem = new CacheItem(String.Format("key{0}", i), null, 0, null);
cacheStore.Set(cacheItem);
}
_ReflectivelyTriggerScavenging(cacheStore);
cacheItemCount = cacheStore.CacheItemCount;
Assert.IsTrue(cacheItemCount == MaxItemsAfterScavenging, "scavenging did not occur as expected");
int numMissing = 0;
for (int i = NumberOfItemsToInsert - 1; i >= NumberOfItemsToInsert - cacheItemCount; i--)
{
CacheItem cacheItem = cacheStore.Get(String.Format("key{0}", i), false);
numMissing += (cacheItem != null ? 0 : 1);
Assert.IsTrue(numMissing <= 1, "more than expected number of items missing");
}
int numFound = 0;
for (int i = NumberOfItemsToInsert - cacheItemCount - 1; i >= 0; i--)
{
CacheItem cacheItem = cacheStore.Get(String.Format("key{0}", i), false);
numFound += (cacheItem != null ? 1 : 0);
Assert.IsTrue(numFound <= 1, "more than expected number of items found");
}
}
public void TestScavengingWithExpiry()
{
const int MaxCacheItemCount = 1000;
const decimal ScavengePercentage = 50;
const int MaxItemsAfterScavenging = (int)(MaxCacheItemCount * ScavengePercentage / 100);
const int NumberOfItemsToInsert = MaxCacheItemCount + 1;
ScavengedExpirableCacheStore cacheStore = new ScavengedExpirableCacheStore(new CacheOptions { ExpirationPollInterval = TimeSpan.FromMinutes(2), MaxCacheItemCount = MaxCacheItemCount, ScavengePercentage = ScavengePercentage });
TestExpirationSpecifier testExpirationSpecifier = new TestExpirationSpecifier();
for (int i = 0; i < NumberOfItemsToInsert; i++)
{
IExpirationSpecifier[] expirationSpecifiers = i >= MaxItemsAfterScavenging ? new IExpirationSpecifier[] { testExpirationSpecifier } : null;
CacheItem cacheItem = new CacheItem(String.Format("key{0}", i), null, 0, expirationSpecifiers);
cacheStore.Set(cacheItem);
}
testExpirationSpecifier.Expired = true;
Thread.Sleep(3000);
int cacheItemCount = cacheStore.CacheItemCount;
Assert.IsTrue(cacheItemCount == MaxItemsAfterScavenging, "scavenging improper");
for (int i = 0; i < cacheItemCount; i++)
{
CacheItem cacheItem = cacheStore.Get(String.Format("key{0}", i), false);
Assert.IsNotNull(cacheItem, "cacheItem expected");
}
}
