VAK

Real-Time Phoenix: only the first 3 responses are displayed on the console (p.101)

Here is a scenario of cyclic sending messages and receiving responses via slowStatsChannel.
The transport accepts all 5 responses, but only the first 3 responses that meet the 10s interval are displayed on the console, as seen in DevTools.
My understanding is that a packet transaction has a lifetime, after which the packets are accepted but are not passed to the processing script. This is a tricky disconcerting point for those who are new to real-time network programming.

1 comment

/book-real-time-phoenix #suggestion

0 445 1

2023-01-05 15:06:11 UTC

First Post!

sb8244

Author of From Ruby to Elixir and Real-Time Phoenix

Just to clarify, do you mean this lifetime is implemented in Phoenix JS lib, or somewhere else?

The packets transmitted over the channel’s WebSocket are not delayed at all. It’s the request/response lifecycle that’s delayed inside of the Channel’s logic (via Process.sleep). So, when a message is sent, it’s going to be sent as fast as possible from client → server and server → client.

WebSocket itself does not have the concept of request/response lifecycle, so that’s all implemented by Phoenix’s libraries.

Post #2

Where Next?

View thread on forum

View Real Time Phoenix's book portal

Post errata for this book

Post a suggestion for this book

Post a question about this book

Post a review about this book

Home PragProg Customers

/book-real-time-phoenix #suggestion

0 445 1

Last post

Popular Pragmatic Bookshelf topics

PragProg Customers

Docker for Rails Developers: Notes for Rails 6.1, Ruby 2.7.2

I thought that there might be interest in using the book with Rails 6.1 and Ruby 2.7.2. I’ll note what I needed to do differently here. ...

/book-docker-for-rails-developers

9 1177 1

2021-01-03 20:41:43 UTC

New

PragProg Customers

The Ray Tracer Challenge: "Computing the normal on a transformed sphere" ebook test

Hi Jamis, I think there’s an issue with a test on chapter 6. I own the ebook, version P1.0 Feb. 2019. This test doesn’t pass for me: ...

#errata /book-the-ray-tracer-challenge

10 1461 5

2025-01-13 14:42:44 UTC

New

PragProg Customers

The Cucumber for Java Book:

Hello! On page xix of the preface, it says there is a community forum "… for help if your’re stuck on one of the exercises in this book… ...

#question /book-the-cucumber-for-java-book

3 1143 1

2021-01-12 18:03:10 UTC

New

PragProg Customers

Concurrent Data Processing in Elixir: various errata

Hi @Margaret , On page VII the book tells us the example and snippets will be all using Elixir version 1.11 But on page 3 almost the en...

#errata /book-concurrent-data-processing-in-elixir

15 1549 13

2021-04-11 17:34:47 UTC

New

PragProg Customers

Modern Front-End Development for Rails: B7 no main folder in the source code (page xv)

On the page xv there is an instruction to run bin/setup from the main folder. I downloaded the source code today (12/03/21) and can’t see...

#errata /book-modern-front-end-development-for-rails

2 1452 11

2022-03-08 17:27:57 UTC

New

PragProg Customers

Distributed Services With Go: Unable to pass readiness/liveness checks. (page 210, 215)

I’m not quite sure what’s going on here, but I’m unable to have to containers successfully complete the Readiness/Liveness checks. I’m im...

/book-distributed-services-with-go

5 1420 5

2022-08-31 00:14:29 UTC

New

PragProg Customers

The Ray Tracer Challenge: cannot pass scaling test (page 69-70)

The test is as follows: Scenario: Intersecting a scaled sphere with a ray Given r ← ray(point(0, 0, -5), vector(0, 0, 1)) And s ← sphere...

#question /book-the-ray-tracer-challenge

1 1093 4

2022-07-27 09:47:44 UTC

New

PragProg Customers

Agile Web Development with Rails 7: (page 70)

Title: Agile Web Development with Rails 7: (page 70) I am running windows 11 pro with rails 7.0.3 and ruby 3.1.2p20 (2022-04-12 revision...

#question /book-agile-web-development-with-rails-7

0 1129 1

2022-06-08 13:17:16 UTC

New

PragProg Customers

Hands-on Rust: Chapter 3: Can't get first hello to run

Hello @herbert ! Trying to get the very first “Hello, Bracket Terminal!" example to run (p. 53). I develop on an Amazon EC2 instance runn...

#question /book-hands-on-rust

0 1147 2

2025-01-07 19:49:45 UTC

New

PragProg Customers

Kotlin and Android Development featuring Jetpack: No activity_main.xml anymore

I just bought this book to learn about Android development, and I’m already running into a major issue in Ch. 1, p. 20: “Update activity...

#errata /book-kotlin-and-android-development-featuring-jetpack

0 2172 6

2023-08-15 06:19:56 UTC

New

Other popular topics

General Dev>Dev Chat

HELLO WORLD (Introductions thread!)

Hello Devtalk World! Please let us know a little about who you are and where you’re from :nerd_face:

#community

482 7161 117

2026-03-22 04:54:57 UTC

New

General Dev>Learning Resources

Forge Your Future with Open Source

Free and open source software is the default choice for the technologies that run our world, and it’s built and maintained by people like...

pragprog.com

#pragprog #published-book /book-forge-your-future-with-open-source

3 5654 0

2020-04-21 18:37:36 UTC

New

Android>Learning Resources

Kotlin and Android Development featuring Jetpack: Build Better, Safer Android Apps

Start building native Android apps the modern way in Kotlin with Jetpack's expansive set of tools, libraries, and best practices. Learn h...

pragprog.com

#pragprog #android #game-dev /kotlin #published-book /book-kotlin-and-android-development-featuring-jetpack

7 5084 1

2020-11-03 20:38:30 UTC

New

Game Dev>Learning Resources

Hands-on Rust: Effective Learning through 2D Game Development and Play

Rust is an exciting new programming language combining the power of C with memory safety, fearless concurrency, and productivity boosters...

pragprog.com

#pragprog /rust #published-book /book-hands-on-rust

117 10879 30

2024-11-09 13:24:20 UTC

New

General Dev>Dev Chat

Languages Without Garbage Collection

Continuing the discussion from Thinking about learning Crystal, let’s discuss - I was wondering which languages don’t GC - maybe we can c...

#garbage-collection

21 5575 7

2021-05-06 05:54:58 UTC

New

General Dev>Questions

Do you prefer regular mechanical keyboards or low profile mechanical keyboards and why?

I have always used antique keyboards like Cherry MX 1800 or Cherry MX 8100 and almost always have modified the switches in some way, like...

/keyboards #mechanical-keyboards

27 3877 9

2023-02-06 21:10:15 UTC

New

Windows>Chat

Taskbar Overflow Menu (NOT System Tray Overflow)

There appears to have been an update that has changed the terminology for what has previously been known as the Taskbar Overflow - this h...

#taskbar-overflow-win-11

3 3715 2

2023-02-13 08:43:55 UTC

New

Backend>Learning Resources

Server-Driven Web Apps with htmx

Build modern server-driven web applications using htmx. Whatever programming language you use, you’ll write less (and cleaner) code. ...

pragprog.com

#pragprog #web-development #published-book /book-server-driven-web-apps-with-htmx

6 5257 3

2024-06-08 22:37:09 UTC

New

Android>Questions

Unresolved Reference to android in build.gradle.kts – Beginner Issue

Hello, I’m a beginner in Android development and I’m facing an issue with my project setup. In my build.gradle.kts file, I have the foll...

#binding

0 7460 2

2024-12-09 21:07:33 UTC

New

Backend>Learning Resources

MySQL 9 Essentials

A concise guide to MySQL 9 database administration, covering fundamental concepts, techniques, and best practices. Neil Smyth MySQL...

pragprog.com

#pragprog #published-book /mysql /book-mysql-9-essentials

2 4162 0

2025-03-12 13:05:49 UTC

New

Real-Time Phoenix: only the first 3 responses are displayed on the console (p.101)

VAK

Real-Time Phoenix: only the first 3 responses are displayed on the console (p.101)