private static void ScanForExpiredItems(CacheTable cache)
{
var expiredEntries = new List <object>();
var now = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
var entries = cache.RemoveByAbsoluteExpiryLessThan(now).Union(
cache.RemoveBySlidingExpiry(now));
// F
// For each expired entry yielded fire off the callback
foreach (var entry in entries)
{
entry._EvictionReason = EvictionReason.Expired;
cache.InvokeEvictionCallbacks(entry);
}
/*
* foreach (var entry in cache._entries.Values)
* {
* if (entry.CheckExpired(now))
* {
* expiredEntries.Add(entry);
* }
* }
*
*
* cache.RemoveEntries(expiredEntries);
*/
}
static void Main(string[] args)
{
// todo:
// In production make one of these a runtime variable
// so there is no overlap if multiple processes are running
/*
* using (var cache = new SubscriberTable())
* {
* cache.Subscribe("sub1", new[] { "chan1", "chan2" });
* cache.Subscribe("sub1", new[] { "chanx", "chan2" });
* cache.Unsubscribe("sub1", "chan2");
* var sub1Chans = cache.GetSubscriberChannels("sub1").ToList();
*
* cache.Subscribe("sub2", new[] { "chan1", "chan3" });
* cache.Subscribe("sub3", new[] { "chan1", "chan4" });
*
* cache.UnsubscribeAll("sub2");
*
* var chanXSubs = cache.GetSubscribers("chanx").ToList();
* var chan1Subs = cache.GetSubscribers("chan1").ToList();
* var chan2Subs = cache.GetSubscribers("chan2").ToList();
* var chan3Subs = cache.GetSubscribers("chan3").ToList();
* var chan4Subs = cache.GetSubscribers("chan4").ToList();
*
* Console.ReadLine();
* }*/
using (var cache = new CacheTable(256))
{
// Test the ram usage
// Add 12,000 88kb sample pages
var bytes = System.IO.File.ReadAllBytes("Cache\\cache-sample.html");
var sw = System.Diagnostics.Stopwatch.StartNew();
for (int i = 0; i < 12000; i++)
{
var test = Lz4.CompressBytes(bytes, 0, bytes.Length, Lz4Mode.Fast);
// Todo:
// Make sure they have at least 3 depdenencies
cache.Set(
$"hash:test:{i}",
test,
new CacheEntryOptions()
// .SetSlidingExpiration(TimeSpan.FromSeconds(5))
.RegisterPostEvictionCallback(OnPostEvication)
);
}
Console.WriteLine($"Writing 12k records took {sw.Elapsed.TotalSeconds}");
sw.Restart();
for (int i = 0; i < 12000; i++)
{
var data = cache.GetData(
$"hash:test:{i}"
);
var test = Lz4.DecompressBytes(data);
}
Console.WriteLine($"Reading 12k records took {sw.Elapsed.TotalSeconds}");
sw.Restart();
// Access the first 1000 a few times to cache them
for (int k = 0; k < 12; k++)
{
for (int i = 0; i < 1000; i++)
{
var data = cache.GetData(
$"hash:test:{i}"
);
var test = Lz4.DecompressBytes(data);
}
}
Console.WriteLine($"Reading 1k hot records 12 times took {sw.Elapsed.TotalMilliseconds}");
sw.Restart();
Console.ReadLine();
cache.Set(
$"hash:test:slide5",
new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 },
new CacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromSeconds(5))
.RegisterPostEvictionCallback(OnPostEvication)
);
cache.Set(
$"hash:test:slide10",
new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 },
new CacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromSeconds(10))
.RegisterPostEvictionCallback(OnPostEvication)
);
cache.Set(
$"hash:test:slide60",
new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 },
new CacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromSeconds(60))
.RegisterPostEvictionCallback(OnPostEvication)
);
cache.Set(
$"hash:test",
new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 },
new CacheEntryOptions()
.SetAbsoluteExpiration(TimeSpan.FromSeconds(5))
.RegisterPostEvictionCallback(OnPostEvication)
);
cache.Set(
$"hash:test1",
new byte[] { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
new CacheEntryOptions()
.SetAbsoluteExpiration(TimeSpan.FromSeconds(10))
.RegisterPostEvictionCallback(OnPostEvication)
);
cache.Set(
$"hash:test2",
new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 },
new CacheEntryOptions()
.SetAbsoluteExpiration(TimeSpan.FromSeconds(60))
.RegisterPostEvictionCallback(OnAnotherPostEvication)
);
cache.Set(
$"hash:test3",
new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 },
new CacheEntryOptions()
.RegisterPostEvictionCallback(OnAnotherPostEvication)
);
System.Threading.Thread.Sleep(TimeSpan.FromSeconds(10));
cache.StartScanForExpiredItems(true);
Console.ReadLine();
// test the cleanup, should onlu remove one
// cache.GetData()
cache.RemoveByDependency("dep:0001");
// RemoveByKey
// RemoveByDependency
// GetByKey
// Cursor
// -> GetPostEvictionDelegate
// ->
// Remove all the test keys which remain
for (int i = 0; i < 12000; i++)
{
cache.RemoveByKey($"{i}");
}
// Dump the whole cache without callbacks
cache.Clear();
}
}
