/// <summary>
/// Register a singleton.
/// </summary>
/// <param name="singleton">The instance.</param>
/// <param name="allowReplace">If true, allow replacement without warning.</param>
public static void AddSingleton(T singleton, bool allowReplace)
{
if (singleton == null)
{
Release();
return;
}
Assert.IsFalse(!allowReplace && Exists, "Replacing a singleton that already exists. Check the stack trace for more info. If you would like to allow replacement, call AddSingleton and set allowReplace to true.");
_singleton = singleton;
if (_onAdd != null)
{
_onAdd(singleton);
_onAdd = null;
}
}
/// <summary>
/// Get a singleton whenever it is available.
/// </summary>
/// <param name="onAdd">The callback to run when singleton Exists</param>
public static void GetSingletonDeferred(SingletonReady onAdd)
{
if (onAdd == null)
{
return;
}
if (Exists)
{
onAdd(GetSingleton());
}
else if (_onAdd == null)
{
_onAdd = onAdd;
}
else
{
_onAdd += onAdd;
}
}
/// <summary>
/// Release the singleton so others can use it.
/// </summary>
public static void Release()
{
_singleton = null;
_onAdd = null;
}
