January 2019
Intermediate to advanced
460 pages
10h 33m
English
Content preview from Hands-On Full-Stack Web Development with GraphQL and React
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Polling with the Query component
Polling is nothing more than rerunning a request after a specified interval. This procedure is the simplest way to implement real-time updates for our news feed. However, multiple issues are associated with polling, as follows:
- It is inefficient to send requests without knowing whether there is any new data. The browser might send dozens of requests without ever receiving a new post.
- If we directly send the initial request again, we will get all of the posts, including those that we are already showing to the user.
- When sending requests, the server needs to query the database and calculate everything. Unnecessary requests cost money and time.
There are some use cases in which polling makes sense. One example ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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