private static void ClearEntry(DeltaBaseCache.Slot e)
{
openByteCount -= e.sz;
e.provider = null;
e.data = DEAD;
e.sz = 0;
}
internal virtual void Store(PackFile pack, long position, byte[] data, int objectType
)
{
if (data.Length > maxByteCount)
{
return;
}
// Too large to cache.
DeltaBaseCache.Slot e = cache[Hash(position)];
if (e == null)
{
e = new DeltaBaseCache.Slot();
cache[Hash(position)] = e;
}
else
{
ClearEntry(e);
}
openByteCount += data.Length;
ReleaseMemory();
e.provider = pack;
e.position = position;
e.sz = data.Length;
e.data = new SoftReference <DeltaBaseCache.Entry>(new DeltaBaseCache.Entry(data, objectType
));
MoveToHead(e);
}
static DeltaBaseCache()
{
DEAD = new SoftReference<DeltaBaseCache.Entry>(null);
maxByteCount = new WindowCacheConfig().GetDeltaBaseCacheLimit();
cache = new DeltaBaseCache.Slot[CACHE_SZ];
for (int i = 0; i < CACHE_SZ; i++)
{
cache[i] = new DeltaBaseCache.Slot();
}
}
static DeltaBaseCache()
{
DEAD = new SoftReference <DeltaBaseCache.Entry>(null);
maxByteCount = new WindowCacheConfig().GetDeltaBaseCacheLimit();
cache = new DeltaBaseCache.Slot[CACHE_SZ];
for (int i = 0; i < CACHE_SZ; i++)
{
cache[i] = new DeltaBaseCache.Slot();
}
}
private static void Unlink(DeltaBaseCache.Slot e)
{
DeltaBaseCache.Slot prev = e.lruPrev;
DeltaBaseCache.Slot next = e.lruNext;
if (prev != null)
{
prev.lruNext = next;
}
if (next != null)
{
next.lruPrev = prev;
}
}
private static void MoveToHead(DeltaBaseCache.Slot e)
{
Unlink(e);
e.lruPrev = null;
e.lruNext = lruHead;
if (lruHead != null)
{
lruHead.lruPrev = e;
}
else
{
lruTail = e;
}
lruHead = e;
}
internal static DeltaBaseCache.Entry Get(PackFile pack, long position)
{
lock (typeof(DeltaBaseCache))
{
DeltaBaseCache.Slot e = cache[Hash(position)];
if (e.provider == pack && e.position == position)
{
DeltaBaseCache.Entry buf = e.data.Get();
if (buf != null)
{
MoveToHead(e);
return(buf);
}
}
return(null);
}
}
internal virtual DeltaBaseCache.Entry Get(PackFile pack, long position)
{
DeltaBaseCache.Slot e = cache[Hash(position)];
if (e == null)
{
return(null);
}
if (e.provider == pack && e.position == position)
{
DeltaBaseCache.Entry buf = e.data.Get();
if (buf != null)
{
MoveToHead(e);
return(buf);
}
}
return(null);
}
private static void ReleaseMemory()
{
while (openByteCount > maxByteCount && lruTail != null)
{
DeltaBaseCache.Slot currOldest = lruTail;
DeltaBaseCache.Slot nextOldest = currOldest.lruPrev;
ClearEntry(currOldest);
currOldest.lruPrev = null;
currOldest.lruNext = null;
if (nextOldest == null)
{
lruHead = null;
}
else
{
nextOldest.lruNext = null;
}
lruTail = nextOldest;
}
}
internal static void Store(PackFile pack, long position, byte[] data, int objectType
)
{
lock (typeof(DeltaBaseCache))
{
if (data.Length > maxByteCount)
{
return;
}
// Too large to cache.
DeltaBaseCache.Slot e = cache[Hash(position)];
ClearEntry(e);
openByteCount += data.Length;
ReleaseMemory();
e.provider = pack;
e.position = position;
e.sz = data.Length;
e.data = new SoftReference <DeltaBaseCache.Entry>(new DeltaBaseCache.Entry(data, objectType
));
MoveToHead(e);
}
}
private static void MoveToHead(DeltaBaseCache.Slot e)
{
Unlink(e);
e.lruPrev = null;
e.lruNext = lruHead;
if (lruHead != null)
{
lruHead.lruPrev = e;
}
else
{
lruTail = e;
}
lruHead = e;
}
private static void ReleaseMemory()
{
while (openByteCount > maxByteCount && lruTail != null)
{
DeltaBaseCache.Slot currOldest = lruTail;
DeltaBaseCache.Slot nextOldest = currOldest.lruPrev;
ClearEntry(currOldest);
currOldest.lruPrev = null;
currOldest.lruNext = null;
if (nextOldest == null)
{
lruHead = null;
}
else
{
nextOldest.lruNext = null;
}
lruTail = nextOldest;
}
}
internal virtual void Store(PackFile pack, long position, byte[] data, int objectType
)
{
if (data.Length > maxByteCount)
{
return;
}
// Too large to cache.
DeltaBaseCache.Slot e = cache[Hash(position)];
if (e == null)
{
e = new DeltaBaseCache.Slot();
cache[Hash(position)] = e;
}
else
{
ClearEntry(e);
}
openByteCount += data.Length;
ReleaseMemory();
e.provider = pack;
e.position = position;
e.sz = data.Length;
e.data = new SoftReference<DeltaBaseCache.Entry>(new DeltaBaseCache.Entry(data, objectType
));
MoveToHead(e);
}
