How deeply does Grokking Concurrency cover handler?

Defines handlers as callbacks and identifies three socket-related roles, without detailing their implementations.

Handler

An event handler is a function or component that processes an event from a particular source or event type.

An event handler is a callback that processes an event or request from a particular source. In an event loop, the reactor routes each ready event to its registered handler. section 11.0 section 11.6

Handlers in a server

_on_accept handles a new connection, _on_read handles a client message, and _on_write handles sending a message to a client. section 11.6

How Grokking Concurrency covers it

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Related concepts

event handlingused by · Event handling is the process of receiving events and invoking associated code to respond to them.
methodused by · A method is a callable operation associated with an object or type and invoked through that association.
business logicuses · Business logic is the domain-specific rules, computations, and decisions that determine how a software system behaves and processes operations.
routinguses · Routing is the selection of a path, destination, or processing component to direct an item, request, or flow toward an intended endpoint.

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