public async Task CollectGcSnapshots()
{
var d = new SnapDictionary <int, string>();
d.Test.CollectAuto = false;
// gen 1
d.Set(1, "one");
Assert.AreEqual(1, d.Test.GetValues(1).Length);
Assert.AreEqual(1, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
var s1 = d.CreateSnapshot();
Assert.AreEqual(1, d.Test.LiveGen);
Assert.IsFalse(d.Test.NextGen);
// gen 2
d.Set(1, "two");
Assert.AreEqual(2, d.Test.GetValues(1).Length);
Assert.AreEqual(2, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
var s2 = d.CreateSnapshot();
Assert.AreEqual(2, d.Test.LiveGen);
Assert.IsFalse(d.Test.NextGen);
// gen 3
d.Set(1, "three");
Assert.AreEqual(3, d.Test.GetValues(1).Length);
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
var s3 = d.CreateSnapshot();
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsFalse(d.Test.NextGen);
Assert.AreEqual(3, d.SnapCount);
s1 = s2 = s3 = null;
await d.CollectAsync();
Assert.AreEqual(3, d.SnapCount);
Assert.AreEqual(3, d.Test.GetValues(1).Length);
GC.Collect();
await d.CollectAsync();
Assert.AreEqual(0, d.SnapCount);
Assert.AreEqual(1, d.Test.GetValues(1).Length);
}
public async Task RandomTest2()
{
var d = new SnapDictionary <int, string>();
d.Test.CollectAuto = false;
d.Set(1, "one");
d.Set(2, "two");
var s1 = d.CreateSnapshot();
var v1 = s1.Get(1);
Assert.AreEqual("one", v1);
d.Clear(1);
var s2 = d.CreateSnapshot();
var v2 = s2.Get(1);
Assert.AreEqual(null, v2);
v1 = s1.Get(1);
Assert.AreEqual("one", v1);
Assert.AreEqual(2, d.SnapCount);
s1 = null;
GC.Collect();
await d.CollectAsync();
// in Release mode, it works, but in Debug mode, the weak reference is still alive
// and for some reason we need to do this to ensure it is collected
#if DEBUG
GC.Collect();
await d.CollectAsync();
#endif
Assert.AreEqual(1, d.SnapCount);
v2 = s2.Get(1);
Assert.AreEqual(null, v2);
s2 = null;
GC.Collect();
await d.CollectAsync();
Assert.AreEqual(0, d.SnapCount);
}
public async Task ProperlyCollects()
{
var d = new SnapDictionary <int, string>();
d.Test.CollectAuto = false;
for (var i = 0; i < 32; i++)
{
d.Set(i, i.ToString());
d.CreateSnapshot().Dispose();
}
Assert.AreEqual(32, d.GenCount);
Assert.AreEqual(0, d.SnapCount); // because we've disposed them
await d.CollectAsync();
Assert.AreEqual(32, d.Test.LiveGen);
Assert.IsFalse(d.Test.NextGen);
Assert.AreEqual(0, d.GenCount);
Assert.AreEqual(0, d.SnapCount);
Assert.AreEqual(32, d.Count);
for (var i = 0; i < 32; i++)
{
d.Set(i, null);
}
d.CreateSnapshot().Dispose();
// because we haven't collected yet, but disposed nevertheless
Assert.AreEqual(1, d.GenCount);
Assert.AreEqual(0, d.SnapCount);
Assert.AreEqual(32, d.Count);
// once we collect, they are all gone
// since noone is interested anymore
await d.CollectAsync();
Assert.AreEqual(0, d.GenCount);
Assert.AreEqual(0, d.SnapCount);
Assert.AreEqual(0, d.Count);
}
public async Task RandomTest2()
{
var d = new SnapDictionary <int, string>();
d.Test.CollectAuto = false;
d.Set(1, "one");
d.Set(2, "two");
var s1 = d.CreateSnapshot();
var v1 = s1.Get(1);
Assert.AreEqual("one", v1);
d.Clear(1);
var s2 = d.CreateSnapshot();
var v2 = s2.Get(1);
Assert.AreEqual(null, v2);
v1 = s1.Get(1);
Assert.AreEqual("one", v1);
Assert.AreEqual(2, d.SnapCount);
s1 = null;
GC.Collect();
await d.CollectAsync();
GC.Collect();
await d.CollectAsync();
Assert.AreEqual(1, d.SnapCount);
v2 = s2.Get(1);
Assert.AreEqual(null, v2);
s2 = null;
GC.Collect();
await d.CollectAsync();
Assert.AreEqual(0, d.SnapCount);
}
public async Task EventuallyCollectNulls()
{
var d = new SnapDictionary <int, string>();
d.Test.CollectAuto = false;
Assert.AreEqual(0, d.Test.GetValues(1).Length);
// gen 1
d.Set(1, "one");
Assert.AreEqual(1, d.Test.GetValues(1).Length);
Assert.AreEqual(1, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
await d.CollectAsync();
var tv = d.Test.GetValues(1);
Assert.AreEqual(1, tv.Length);
Assert.AreEqual(1, tv[0].Gen);
var s = d.CreateSnapshot();
Assert.AreEqual("one", s.Get(1));
Assert.AreEqual(1, d.Test.LiveGen);
Assert.IsFalse(d.Test.NextGen);
Assert.AreEqual(1, d.Count);
Assert.AreEqual(1, d.SnapCount);
Assert.AreEqual(1, d.GenCount);
// gen 2
d.Clear(1);
tv = d.Test.GetValues(1);
Assert.AreEqual(2, tv.Length);
Assert.AreEqual(2, tv[0].Gen);
Assert.AreEqual(2, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
Assert.AreEqual(1, d.Count);
Assert.AreEqual(1, d.SnapCount);
Assert.AreEqual(1, d.GenCount);
// nothing to collect
await d.CollectAsync();
GC.KeepAlive(s);
Assert.AreEqual(2, d.Test.GetValues(1).Length);
Assert.AreEqual(1, d.Count);
Assert.AreEqual(1, d.SnapCount);
Assert.AreEqual(1, d.GenCount);
Assert.AreEqual(2, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
// collect snapshot
// don't collect liveGen+
s = null; // without being disposed
GC.Collect(); // should release the generation reference
await d.CollectAsync();
Assert.AreEqual(1, d.Test.GetValues(1).Length); // "one" value is gone
Assert.AreEqual(1, d.Count); // still have 1 item
Assert.AreEqual(0, d.SnapCount); // snapshot is gone
Assert.AreEqual(0, d.GenCount); // and generation has been dequeued
// liveGen/nextGen
s = d.CreateSnapshot();
s = null;
// collect liveGen
GC.Collect();
Assert.IsTrue(d.Test.GenObjs.TryPeek(out var genObj));
genObj = null;
// in Release mode, it works, but in Debug mode, the weak reference is still alive
// and for some reason we need to do this to ensure it is collected
#if DEBUG
await d.CollectAsync();
GC.Collect();
#endif
Assert.IsTrue(d.Test.GenObjs.TryPeek(out genObj));
Assert.IsFalse(genObj.WeakGenRef.IsAlive); // snapshot is gone, along with its reference
await d.CollectAsync();
Assert.AreEqual(0, d.Test.GetValues(1).Length); // null value is gone
Assert.AreEqual(0, d.Count); // item is gone
Assert.AreEqual(0, d.Test.GenObjs.Count);
Assert.AreEqual(0, d.SnapCount); // snapshot is gone
Assert.AreEqual(0, d.GenCount); // and generation has been dequeued
}
public async Task CollectNulls()
{
var d = new SnapDictionary <int, string>();
d.Test.CollectAuto = false;
// gen 1
d.Set(1, "one");
Assert.AreEqual(1, d.Test.GetValues(1).Length);
d.Set(1, "one");
Assert.AreEqual(1, d.Test.GetValues(1).Length);
d.Set(1, "uno");
Assert.AreEqual(1, d.Test.GetValues(1).Length);
Assert.AreEqual(1, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
var s1 = d.CreateSnapshot();
Assert.AreEqual(1, d.Test.LiveGen);
Assert.IsFalse(d.Test.NextGen);
// gen 2
Assert.AreEqual(1, d.Test.GetValues(1).Length);
d.Set(1, "one");
Assert.AreEqual(2, d.Test.GetValues(1).Length);
d.Set(1, "uno");
Assert.AreEqual(2, d.Test.GetValues(1).Length);
Assert.AreEqual(2, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
var s2 = d.CreateSnapshot();
Assert.AreEqual(2, d.Test.LiveGen);
Assert.IsFalse(d.Test.NextGen);
// gen 3
Assert.AreEqual(2, d.Test.GetValues(1).Length);
d.Set(1, "one");
Assert.AreEqual(3, d.Test.GetValues(1).Length);
d.Set(1, "uno");
Assert.AreEqual(3, d.Test.GetValues(1).Length);
d.Clear(1);
Assert.AreEqual(3, d.Test.GetValues(1).Length);
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
var tv = d.Test.GetValues(1);
Assert.AreEqual(3, tv[0].Gen);
Assert.AreEqual(2, tv[1].Gen);
Assert.AreEqual(1, tv[2].Gen);
Assert.AreEqual(0, d.Test.FloorGen);
// nothing to collect
await d.CollectAsync();
GC.KeepAlive(s1);
GC.KeepAlive(s2);
Assert.AreEqual(0, d.Test.FloorGen);
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
Assert.AreEqual(2, d.SnapCount);
Assert.AreEqual(3, d.Test.GetValues(1).Length);
// one snapshot to collect
s1 = null;
GC.Collect();
GC.KeepAlive(s2);
await d.CollectAsync();
Assert.AreEqual(1, d.Test.FloorGen);
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
Assert.AreEqual(1, d.SnapCount);
Assert.AreEqual(2, d.Test.GetValues(1).Length);
// another snapshot to collect
s2 = null;
GC.Collect();
await d.CollectAsync();
Assert.AreEqual(2, d.Test.FloorGen);
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
Assert.AreEqual(0, d.SnapCount);
// and everything is gone?
// no, cannot collect the live gen because we'd need to lock
Assert.AreEqual(1, d.Test.GetValues(1).Length);
d.CreateSnapshot();
GC.Collect();
await d.CollectAsync();
// poof, gone
Assert.AreEqual(0, d.Test.GetValues(1).Length);
}
public async Task CollectValues()
{
var d = new SnapDictionary <int, string>();
d.Test.CollectAuto = false;
// gen 1
d.Set(1, "one");
Assert.AreEqual(1, d.Test.GetValues(1).Length);
d.Set(1, "one");
Assert.AreEqual(1, d.Test.GetValues(1).Length);
d.Set(1, "uno");
Assert.AreEqual(1, d.Test.GetValues(1).Length);
Assert.AreEqual(1, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
SnapDictionary <int, string> .Snapshot s1 = d.CreateSnapshot();
Assert.AreEqual(1, d.Test.LiveGen);
Assert.IsFalse(d.Test.NextGen);
// gen 2
Assert.AreEqual(1, d.Test.GetValues(1).Length);
d.Set(1, "one");
Assert.AreEqual(2, d.Test.GetValues(1).Length);
d.Set(1, "uno");
Assert.AreEqual(2, d.Test.GetValues(1).Length);
Assert.AreEqual(2, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
SnapDictionary <int, string> .Snapshot s2 = d.CreateSnapshot();
Assert.AreEqual(2, d.Test.LiveGen);
Assert.IsFalse(d.Test.NextGen);
// gen 3
Assert.AreEqual(2, d.Test.GetValues(1).Length);
d.Set(1, "one");
Assert.AreEqual(3, d.Test.GetValues(1).Length);
d.Set(1, "uno");
Assert.AreEqual(3, d.Test.GetValues(1).Length);
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
SnapDictionary <int, string> .TestHelper.GenVal[] tv = d.Test.GetValues(1);
Assert.AreEqual(3, tv[0].Gen);
Assert.AreEqual(2, tv[1].Gen);
Assert.AreEqual(1, tv[2].Gen);
Assert.AreEqual(0, d.Test.FloorGen);
// nothing to collect
await d.CollectAsync();
GC.KeepAlive(s1);
GC.KeepAlive(s2);
Assert.AreEqual(0, d.Test.FloorGen);
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
Assert.AreEqual(2, d.SnapCount);
Assert.AreEqual(3, d.Test.GetValues(1).Length);
// one snapshot to collect
s1 = null;
GC.Collect();
GC.KeepAlive(s2);
await d.CollectAsync();
Assert.AreEqual(1, d.Test.FloorGen);
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
Assert.AreEqual(1, d.SnapCount);
Assert.AreEqual(2, d.Test.GetValues(1).Length);
// another snapshot to collect
s2 = null;
GC.Collect();
await d.CollectAsync();
Assert.AreEqual(2, d.Test.FloorGen);
Assert.AreEqual(3, d.Test.LiveGen);
Assert.IsTrue(d.Test.NextGen);
Assert.AreEqual(0, d.SnapCount);
Assert.AreEqual(1, d.Test.GetValues(1).Length);
}
