public SharedCachingStrategy(int cacheSize)
{
cacheSize &= (int)(CachedPage._outPageBits & 0x7fffffff);
_dirtyPages = new HashSet();
_pagesCache = new ObjectCache(cacheSize >> CachedPage._pageShiftBits);
_pagesCache.ObjectRemoved += new ObjectCacheEventHandler(_pagesCache_ObjectRemoved);
_searchKey = new CachedPageKey(null, 0);
}
public void Flush(CachedStream owner)
{
if (_dirtyPages.Count > 0)
{
if (_dirtyPages.Count == 1)
{
foreach (HashSet.Entry e in _dirtyPages)
{
CachedPageKey key = (CachedPageKey)e.Key;
if (Object.ReferenceEquals(key._owner, owner))
{
((CachedPage)_pagesCache.TryKey(key)).Save();
}
}
}
else
{
IntArrayList pageOffsets = IntArrayListPool.Alloc();
try
{
foreach (HashSet.Entry e in _dirtyPages)
{
CachedPageKey key = (CachedPageKey)e.Key;
if (Object.ReferenceEquals(key._owner, owner))
{
pageOffsets.Add(key._offset);
}
}
pageOffsets.Sort();
_searchKey._owner = owner;
for (int i = 0; i < pageOffsets.Count; ++i)
{
_searchKey._offset = pageOffsets[i];
((CachedPage)_pagesCache.TryKey(_searchKey)).Save();
}
}
finally
{
IntArrayListPool.Dispose(pageOffsets);
}
}
}
if (owner.GetUnderlyingStream().CanWrite)
{
owner.GetUnderlyingStream().Flush();
}
}
public override bool Equals(object o)
{
CachedPageKey right = (CachedPageKey)o;
return(Object.ReferenceEquals(right._owner, _owner) && right._offset == _offset);
}
