code: private boolean includedInJobGraph(final JobVertexID id) {
  
  		if (this.inputVertices.containsKey(id)) {
  			return true;
  		}
  
  		if (this.outputVertices.containsKey(id)) {
  			return true;
  		}
  
  		if (this.taskVertices.containsKey(id)) {
  			return true;
  		}
  
  		return false;
  	}
docs: Checks if the job vertex with the given ID is registered with the job graph.
  
  @param id
  the ID of the vertex to search for
  @return <code>true</code> if a vertex with the given ID is registered with the job graph, <code>false</code>
  otherwise.