@Override
	public List<ModuleDescriptor> getModuleDescriptors() {
		return descriptors;
	}
Return the ordered list of modules for this stream as a {@link List}.
This allows for retrieval of modules in the stream by index.
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