public void TestKeepAliveMax()
{
WeakReference r;
ObjectKeepAlive keep = new ObjectKeepAlive(25, 50, TimeSpan.FromSeconds(1));
if(true)
{
object target = new MyObject();
r = new WeakReference(target);
keep.Add(target);
target = null;
}
_destroyed = false;
Assert.IsTrue(r.IsAlive);
for (int i = 0; i < 49; i++)
keep.Add(i);
Assert.IsTrue(r.IsAlive);
GC.GetTotalMemory(true);
GC.WaitForPendingFinalizers();
Assert.IsTrue(r.IsAlive);
Assert.IsFalse(_destroyed);
keep.Add(new object());
keep.Add(new object());
GC.GetTotalMemory(true);
GC.WaitForPendingFinalizers();
Assert.IsFalse(r.IsAlive);
Assert.IsTrue(_destroyed);
}
public void TestTruncateLarge()
{
TimeSpan timeout = TimeSpan.FromMilliseconds(25);
ObjectKeepAlive keep = new ObjectKeepAlive(100, 10000, timeout);
for (int i = 0; i < 100000; i++)
keep.Add(i);
System.Threading.Thread.Sleep(timeout);
for (int i = 0; i < 10000; i++)
keep.Add(i);
}
public void TestKeepAliveTime()
{
WeakReference r;
TimeSpan timeout = TimeSpan.FromMilliseconds(100);
ObjectKeepAlive keep = new ObjectKeepAlive(1, 10, timeout, false);
if (true)
{
object target = new MyObject();
r = new WeakReference(target);
keep.Add(target);
target = null;
}
_destroyed = false;
Assert.IsTrue(r.IsAlive);
for (int i = 0; i < 5; i++)
{
keep.Add(i);
}
Assert.IsTrue(r.IsAlive);
GC.GetTotalMemory(true);
GC.WaitForPendingFinalizers();
Assert.IsTrue(r.IsAlive);
Assert.IsFalse(_destroyed);
long start = DateTime.UtcNow.Ticks;
while ((start + timeout.Ticks) > DateTime.UtcNow.Ticks)
{
System.Threading.Thread.SpinWait(100);
}
//Time has elapsed, yet it nothing is added, and Tick() is not called, it remains in memory
GC.GetTotalMemory(true);
GC.WaitForPendingFinalizers();
Assert.IsTrue(r.IsAlive);
Assert.IsFalse(_destroyed);
//Once the collection is touched with either a call to Add or Tick, timeout will expire
keep.Add(new object());
GC.GetTotalMemory(true);
GC.WaitForPendingFinalizers();
Assert.IsFalse(r.IsAlive);
Assert.IsTrue(_destroyed);
}
public void TestKeepAliveMin()
{
WeakReference r;
ObjectKeepAlive keep = new ObjectKeepAlive(1, 10, TimeSpan.FromTicks(1), true);
for (int i = 0; i < 35; i++)
{
keep.Add(i);
}
if (true)
{
object target = new MyObject();
r = new WeakReference(target);
keep.Add(target);
target = null;
}
_destroyed = false;
Assert.IsTrue(r.IsAlive);
for (int i = 0; i < 100; i++)
{
keep.Tick();
}
Assert.IsTrue(r.IsAlive);
GC.GetTotalMemory(true);
GC.WaitForPendingFinalizers();
Assert.IsTrue(r.IsAlive);
Assert.IsFalse(_destroyed);
System.Threading.Thread.Sleep(1);
GC.GetTotalMemory(true);
GC.WaitForPendingFinalizers();
Assert.IsTrue(r.IsAlive);
Assert.IsFalse(_destroyed);
keep.Clear();
GC.GetTotalMemory(true);
GC.WaitForPendingFinalizers();
Assert.IsFalse(r.IsAlive);
Assert.IsTrue(_destroyed);
}
public NodeCacheNormal(BPlusTreeOptions <TKey, TValue> options) : base(options)
{
_keepAlive = new ObjectKeepAlive(options.CacheKeepAliveMinimumHistory, options.CacheKeepAliveMaximumHistory, TimeSpan.FromMilliseconds(options.CacheKeepAliveTimeout));
_cache = new Dictionary <NodeHandle, WeakReference <CacheEntry> >();
_cacheLock = new SimpleReadWriteLocking();
}