public static IActionExecutor GetActionExecutor(ActionToken actionToken)
{
if (actionToken == null)
{
throw new ArgumentNullException("actionToken");
}
IActionExecutor actionExecutor;
if (_actionExecutorCache.TryGetValue(actionToken.GetType(), out actionExecutor) == false)
{
object[] attributes = actionToken.GetType().GetCustomAttributes(typeof(ActionExecutorAttribute), true);
if (attributes.Length == 0)
{
throw new InvalidOperationException(string.Format("Missing {0} attribute on the flow token {1}", typeof(ActionExecutorAttribute), actionToken.GetType()));
}
ActionExecutorAttribute attribute = (ActionExecutorAttribute)attributes[0];
if (attribute.ActionExecutorType == null)
{
throw new InvalidOperationException(string.Format("Action executor type can not be null on the action token {0}", actionToken.GetType()));
}
if (typeof(IActionExecutor).IsAssignableFrom(attribute.ActionExecutorType) == false)
{
throw new InvalidOperationException(string.Format("Action executor {0} should implement the interface {1}", attribute.ActionExecutorType, typeof(IActionExecutor)));
}
actionExecutor = (IActionExecutor)Activator.CreateInstance(attribute.ActionExecutorType);
_actionExecutorCache.Add(actionToken.GetType(), actionExecutor);
}
return(actionExecutor);
}