How deeply does The Art of Code cover polling?

Defines polling, illustrates fixed intervals and wasted requests, and stops short of implementation code.

Polling

A communication technique in which a program repeatedly requests an endpoint to check for changes.

Polling repeatedly calls an endpoint to check for changes. It is straightforward, but fixed-interval requests can waste network and server resources when nothing has changed. section 8.4.4

Choose polling deliberately:

Use a modest interval when updates are rare and simplicity matters. section 8.4.4
Treat the polling rate as a resource decision: polling every five seconds instead of every five minutes creates 59 extra requests per five-minute window. section 8.4.4
Consider WebSockets or Server-Sent Events when updates are frequent, while accounting for their open connections and server-resource costs. section 8.4.4

Dashboard refresh

A weather or financial dashboard can contact the backend at fixed intervals and ask, “Anything new?” If changes are infrequent, lengthening the interval may avoid many empty responses without requiring a more complex push mechanism. section 8.4.4

How The Art of Code covers it

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Also explained in

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LatencyPolling is the repeated checking of a device or status condition by software instead of waiting for an interrupt.
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API Design PatternsA polling loop is a repeated sequence of requests that checks an asynchronous operation until a completion condition is reached.
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Logs and TelemetryPolling is a technique in which a client periodically requests data or checks state from a service.
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Python Concurrency with asyncioPolling is a technique that repeatedly checks a resource to determine whether it is ready for processing.
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Data Pipelines with Apache Airflow, Second EditionPolling is the technique of repeatedly checking an external system or condition at intervals until a desired state is observed.
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Learn Rust in a Month of LunchesPolling is the process of repeatedly checking asynchronous computations for progress or completion.
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Build Your Own Robot: Using Python, CRICKIT, and Raspberry PiPolling is a technique that repeatedly checks a resource or condition at a configured interval.
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The Design of Web APIs, Second EditionA polling strategy repeatedly sends requests to check the current state or result of an asynchronously running operation.

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Related concepts

WebSocketalternative to · WebSocket is a network protocol that enables persistent, bidirectional, full-duplex communication between endpoints over a single TCP connection.
sensorused by · An Airflow sensor is a task component that repeatedly waits for an external condition or event and succeeds when it becomes true.
source connectorused by · A source connector is a Kafka Connect connector that reads data from an external source system and publishes records to Kafka.
HTTP GETuses · HTTP GET is a request method for retrieving a representation of a resource identified by the request target, without requesting a state change.
file watcheralternative to · A file watcher is a background process or component that detects changes to files or directories in a filesystem.
Amazon SQSused by · Amazon Simple Queue Service (SQS) is a managed AWS message-queuing service for storing and asynchronously exchanging messages between distributed software components.

This explainer was generated by Manning's knowledge graph from the text of The Art of Code. The section links point to the parts of the book it draws on.