public Deque<ModuleDescriptor> getModuleDescriptorsAsDeque() {
		return descriptors;
	}
Return the ordered list of modules for this stream. Modules
are maintained in stream flow order (source is first, sink is last).

@return list of module descriptors for this stream definition
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/core/Stream.java