internal V Get <V>(UserDataSlot <V> slot, V defaultValue)
{
using (synchronizer.AcquireReadLock())
{
return(slot.GetUserData(this, defaultValue));
}
}
internal bool Remove <V>(UserDataSlot <V> slot)
{
using (synchronizer.AcquireWriteLock())
{
return(slot.RemoveUserData(this));
}
}
internal void Set <V>(UserDataSlot <V> slot, V userData)
{
using (synchronizer.AcquireWriteLock())
{
slot.SetUserData(this, userData);
}
}
internal bool Get <V>(UserDataSlot <V> slot, out V userData)
{
using (synchronizer.AcquireReadLock())
{
return(slot.GetUserData(this, out userData));
}
}
public static void UserDataStorageGetOrSetSimpleFactory()
{
string CreateString() => "Hello, world!";
var obj = new object();
var slot = UserDataSlot <string> .Allocate();
Equal("Hello, world!", obj.GetUserData().GetOrSet(slot, CreateString));
}
public static void UserDataStorageGetOrSet()
{
string ToStr(int value) => value.ToString();
var obj = new object();
var slot = UserDataSlot <string> .Allocate();
Equal("42", obj.GetUserData().GetOrSet(slot, 42, ToStr));
}
public static void UserDataStorage()
{
var slot = UserDataSlot <long> .Allocate();
var str = new string('a', 3);
str.GetUserData().Set(slot, 42);
Equal(42, str.GetUserData().Get(slot));
str = null;
GC.Collect();
GC.WaitForFullGCComplete();
str = new string('a', 3);
Equal(0, str.GetUserData().Get(slot));
}
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));
}
}
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);
}
}
