/// <summary>
/// Gets a dispatcher from the cache if available otherwise
/// invokes factory to produce one and then cache it.
/// </summary>
/// <param name="key">the dispatcher key</param>
/// <param name="factory">function to produce a dispatcher in case one it's not yet available</param>
/// <returns></returns>
public Dispatcher Get(DispatcherKey key, DispatcherFactory factory)
{
Dispatcher dispatcher;
if (!_cache.TryGetValue(key, out dispatcher))
{
lock (_cache)
{
if (!_cache.TryGetValue(key, out dispatcher))
{
dispatcher = factory();
_cache.Add(key, dispatcher);
}
}
}
return dispatcher;
}
private static Dispatcher GetDispatcher(object target, string cacheKeyName, Type[] cacheKeyTypes, DispatcherCache.DispatcherFactory factory)
{
var targetType = (target as Type) ?? target.GetType();
var key = new DispatcherKey(targetType, cacheKeyName, cacheKeyTypes);
return _cache.Get(key, factory);
}
private static object Dispatch(object target, string cacheKeyName, Type[] cacheKeyTypes, object[] args, DispatcherCache.DispatcherFactory factory)
{
Type targetType = (target as Type) ?? target.GetType();
DispatcherKey key = new DispatcherKey(targetType, cacheKeyName, cacheKeyTypes);
Dispatcher dispatcher = _cache.Get(key, factory);
return dispatcher(target, args);
}