internal V Get <V>(UserDataSlot <V> slot, V defaultValue)
{
using (synchronizer.AcquireReadLock())
{
return(slot.GetUserData(this, defaultValue));
}
}
internal bool Get <V>(UserDataSlot <V> slot, out V userData)
{
using (synchronizer.AcquireReadLock())
{
return(slot.GetUserData(this, out userData));
}
}
internal V GetOrSet <V, S>(UserDataSlot <V> slot, ref S valueFactory)
where S : struct, ISupplier <V>
{
V userData;
//fast path - read user data if it is already exists
//do not use UpgradeableReadLock due to performance reasons
using (synchronizer.AcquireReadLock())
{
if (slot.GetUserData(this, out userData))
{
return(userData);
}
}
//non-fast path, no user data presented
using (synchronizer.AcquireWriteLock())
{
if (!slot.GetUserData(this, out userData))
{
slot.SetUserData(this, userData = valueFactory.Supply());
}
return(userData);
}
}
internal bool Remove <V>(UserDataSlot <V> slot, out V userData)
{
//fast path if user data doesn't exist
using (synchronizer.AcquireReadLock())
{
if (!slot.Contains(this))
{
userData = default;
return(false);
}
}
//non-fast path, user data exists, so remove it
using (synchronizer.AcquireWriteLock())
{
userData = slot.GetUserData(this, default);
return(slot.RemoveUserData(this));
}
}
