private LockingDictionary <StorageKey, ObjectDecorator> GetSingleKeySpace(DataBuffer keySpace)
{
var hash = keySpace.GetHashCode();
LockingDictionary <StorageKey, ObjectDecorator> keySpaceDct;
// upgradeable blocks other upgradeable, so try read first
using (_keySpaces.Lock(LockType.Read))
{
if (_keySpaces.TryGetValue(hash, out keySpaceDct))
{
return(keySpaceDct);
}
}
// didn't find it, so now try upgradeable to write if need be
using (_keySpaces.Lock(LockType.ReadUpgradable))
{
if (!_keySpaces.TryGetValue(hash, out keySpaceDct))
{
using (_keySpaces.Lock(LockType.Write))
{
keySpaceDct = new LockingDictionary <StorageKey, ObjectDecorator>();
_keySpaces.Add(hash, keySpaceDct);
}
}
return(keySpaceDct);
}
}