public Iterator<ModuleDescriptor> getDeploymentOrderIterator() {
		return descriptors.descendingIterator();
	}
Return an iterator that indicates the order of module deployments for this
stream. The modules are returned in reverse order; i.e. the sink is returned
first followed by the processors in reverse order followed by the
source.

@return iterator that iterates over the modules in deployment order
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/core/Stream.java