The /atg/endeca/assembler/cartridge/manager/MdexResource component, of class com.endeca.infront.navigation.model.MdexResource, is a request-scoped component that represents a connection to a single MDEX. The NucleusAssembler uses this component to connect to the correct MDEX for content.

The MdexResource component has host and port properties that represent the MDEX host and port to use for the current request. The MdexResource component gets the values for these properties from the AssemblerApplicationConfiguration component, specifically, the AssemblerApplicationConfiguration.currentMdexHostName and AssemblerApplicationConfiguration.currentMdexPort properties.