Relationship Terms
A Workers application is built up out of one or more Workers, connected together in a call-chain hierarchy that looks like a tree. Lets take an example of an application that is built up out of four Workers, whose Worker call-chain hierarchy is represented by the diagram below.
Head Worker
Every Workers application has a head Worker. An applications Head Worker is the Worker at the very top of an application's Worker call-chain hierarchy. In the figure below, Worker A is the Head Worker of the application.
Caller
A Caller is a Worker that calls (or loads) one or more Workers. In the figure below, Worker A is the Caller of Workers B, C and D.
subWorker
A subWorker is a Worker that is called (or loaded) by another Worker. In the figure below, Worker B, Worker C and Worker D are subWorkers of Worker A.
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