private Task TransitionTo(NodeRole newRole, IDictionary <string, string[]> hostArguments)
{
var startTasks = new ConcurrentBag <Task>();
Parallel.ForEach(_appStarters, starter =>
{
AppFunc chain = null;
if (Chains.ContainsKey(starter.Chain))
{
chain = Chains[starter.Chain];
}
chain = chain ?? starter.GetDefaultChain(GetAppFunctionBuilder(starter.Chain), Environment, ApplicationEnvironment);
if (chain != null)
{
startTasks.Add(starter.BringToState(chain, Environment, ApplicationEnvironment, newRole, hostArguments));
}
});
return(Task.WhenAll(startTasks));
}