/// <summary>Clear all entries related to a single file.</summary>
/// <remarks>
/// Clear all entries related to a single file.
/// <p>
/// Typically this method is invoked during
/// <see cref="PackFile.Close()">PackFile.Close()</see>
/// , when we
/// know the pack is never going to be useful to us again (for example, it no
/// longer exists on disk). A concurrent reader loading an entry from this
/// same pack may cause the pack to become stuck in the cache anyway.
/// </remarks>
/// <param name="pack">the file to purge all entries of.</param>
private void RemoveAll(PackFile pack)
{
for (int s = 0; s < tableSize; s++)
{
WindowCache.Entry e1 = table.Get(s);
bool hasDead = false;
for (WindowCache.Entry e = e1; e != null; e = e.next)
{
if ([email protected] == pack)
{
e.Kill();
hasDead = true;
}
else
{
if (e.dead)
{
hasDead = true;
}
}
}
if (hasDead)
{
table.CompareAndSet(s, e1, Clean(e1));
}
}
Gc();
}
private void Evict()
{
while (IsFull())
{
int ptr = rng.Next(tableSize);
WindowCache.Entry old = null;
int slot = 0;
for (int b = evictBatch - 1; b >= 0; b--, ptr++)
{
if (tableSize <= ptr)
{
ptr = 0;
}
for (WindowCache.Entry e = table.Get(ptr); e != null; e = e.next)
{
if (e.dead)
{
continue;
}
if (old == null || [email protected] < [email protected])
{
old = e;
slot = ptr;
}
}
}
if (old != null)
{
old.Kill();
Gc();
WindowCache.Entry e1 = table.Get(slot);
table.CompareAndSet(slot, e1, Clean(e1));
}
}
}
/// <summary>Clear every entry from the cache.</summary>
/// <remarks>
/// Clear every entry from the cache.
/// <p>
/// This is a last-ditch effort to clear out the cache, such as before it
/// gets replaced by another cache that is configured differently. This
/// method tries to force every cached entry through
/// <see cref="Clear(Ref)">Clear(Ref)</see>
/// to
/// ensure that resources are correctly accounted for and cleaned up by the
/// subclass. A concurrent reader loading entries while this method is
/// running may cause resource accounting failures.
/// </remarks>
private void RemoveAll()
{
for (int s = 0; s < tableSize; s++)
{
WindowCache.Entry e1;
do
{
e1 = table.Get(s);
for (WindowCache.Entry e = e1; e != null; e = e.next)
{
e.Kill();
}
}while (!table.CompareAndSet(s, e1, null));
}
Gc();
}
private ByteWindow Scan(WindowCache.Entry n, PackFile pack, long position)
{
for (; n != null; n = n.next)
{
WindowCache.Ref r = n.@ref;
if (r.pack == pack && r.position == position)
{
ByteWindow v = r.Get();
if (v != null)
{
Hit(r);
return(v);
}
n.Kill();
break;
}
}
return(null);
}
