Proposed Graph API psuedo-code

TestGraphSpec.java

class GraphSpec<T> {}
class NodeSpec<T> {}
class State<T> {}

GraphSpec<T> graph = Graphs.compose()
	.env(env)
	.dispatcher(dispatcher)
	.create("bad arg handler", new Consumer<State<Throwable>>(){})
	.create("global err handler", new Consumer<State<Throwable>>(){});

NodeSpec<T> n1 = graph.when("condition name", new Predicate<State<T>>(){}) 
	.swap(new Function<State<T>, State<V>>(){})
		.then().end(new Consumer<State<V>>(){})
	.otherwise()
		.end(new Function<State<T>, State<V>>(){});

NodeSpec<T> n2 = graph.when(IllegalArgumentException.class)
	.then(new Consumer<State<IllegalArgumentException>>(){}, dispatcher)
	.otherwise()
		.end("global err handler");

graph.get().accept(value);