java - Starting Services -- Directed Acyclic Graph -

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The structure I am working with includes state services, which depend on other services, a guided escie Create graphs

I want to start services as efficiently as possible. It means starting services in parallel, where possible. For example, in the article on the Wikipedia link, I will start 3, 5 and 7 at the same time because they have no dependencies, I have seen the topological types, but alone you do not tell what can be started in parallel is. I am looking for group services for a library / API, like something: 

 ab, c, d, e f, g, h  
 where it calls me "a" First, then says "B", "C", and "D" in parallel, then "E" and so on.  
 I have got some libraries which are model videos, but the grouping I am looking for did not get anything. So far, I have received some implementations for the guided graph, however, I need an approved license (eg non-GPL). I have got a ComputeNode order (from Equine org.eclipse.osgi_3.6.2.R36x_v20110210), Jeffroft (LGPL), Jung, Forged, but not sure if anybody / I want what I want   
 
 
 This seems like a tree using the fourth search for me parallel to the services at each level Can be started in; Later dependency is done in the tree and below.

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