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

The Definitive ANTLR 4 Reference: Program deprecation warning

page 37 ANTLRInputStream input = new ANTLRInputStream(is); as of ANTLR 4 .8 should be: CharStream stream = CharStreams.fromStream(i...

#errata /book-the-definitive-antlr-4-reference

4 986 0

2020-07-05 23:04:12 UTC

New

PragProg Customers

Programming Flutter: Image.toByteData() does not exist (page40)

your book suggests to use Image.toByteData() to convert image to bytes, however I get the following error: "the getter ‘toByteData’ isn’t...

/book-programming-flutter #question

1 4089 2

2021-02-23 16:03:08 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 1455 5

2025-01-13 14:42:44 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 1544 13

2021-04-11 17:34:47 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: File not Found Error (page 43)

I ran this command after installing the sample application: $ cards add do something --owner Brian And got a file not found error: Fil...

#errata /book-python-testing-with-pytest-second-edition

5 4386 7

2021-07-03 13:51:08 UTC

New

PragProg Customers

Kotlin and Android Development featuring Jetpack: Error in generated Game.java (page 136)

I’m under the impression that when the reader gets to page 136 (“View Data with the Database Inspector”), the code SHOULD be able to buil...

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

2 1166 8

2021-09-17 18:06:54 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: unrecognized arguments error (page 122)

When I run the coverage example to report on missing lines, I get: pytest --cov=cards --report=term-missing ch7 ERROR: usage: pytest [op...

#errata /book-python-testing-with-pytest-second-edition

0 3982 1

2021-12-03 05:36:38 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: InterpreterNotFound error when running tox (page 150)

When running tox for the first time, I got the following error: ERROR: InterpreterNotFound: python3.10 I realised that I was running ...

#errata /book-python-testing-with-pytest-second-edition

0 1305 1

2021-12-10 05:06:56 UTC

New

PragProg Customers

iOS Unit Testing by Example: 54 Don't seem to be getting the print out on tests (Xcode 13.2)

Hey there, I’m enjoying this book and have learned a few things alredayd. However, in Chapter 4 I believe we are meant to see the “>...

#question /book-ios-unit-testing-by-example

0 1947 3

2022-01-24 15:18:41 UTC

New

PragProg Customers

Agile Web Development with Rails 7: Reloading assets in development mode

Hi all, currently I wonder how the Tailwind colours work (or don’t work). For example, in app/views/layouts/application.html.erb I have...

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

2 1379 4

2022-02-18 10:00:49 UTC

New

Other popular topics

Science/Tech>Health & Diet

How do you keep fit and healthy?

@AstonJ prompted me to open this topic after I mentioned in the lockdown thread how I started to do a lot more for my fitness. https://f...

#fitness #heath

193 4728 82

2023-01-23 06:00:46 UTC

New

Community>Journals

Programming Erlang Book Club

My first contact with Erlang was about 2 years ago when I used RabbitMQ, which is written in Erlang, for my job. This made me curious and...

/erlang /book-programming-erlang-2nd-edition #book-club

195 6634 95

2025-02-16 20:22:17 UTC

New

General Dev>Hardware

GMK Serika Keycaps - Serika 2 available to order now!

I have seen the keycaps I want - they are due for a group-buy this week but won’t be delivered until October next year!!! :rofl: The Ser...

/keyboards #keycaps #mechanical-keyboards

9 4719 7

2020-12-05 21:32:30 UTC

New

General Dev>Dev Chat

Warp—The blazingly fast, Rust-based terminal

A few weeks ago I started using Warp a terminal written in rust. Though in it’s current state of development there are a few caveats (tab...

/rust #terminal

52 5824 22

2025-02-26 17:47:24 UTC

New

Backend>Learning Resources

Agile Web Development with Rails 7

Rails 7 completely redefines what it means to produce fantastic user experiences and provides a way to achieve all the benefits of single...

pragprog.com

#pragprog #web-development /ruby /rails #published-book /book-agile-web-development-with-rails-7

32 5327 9

2022-01-26 18:28:44 UTC

New

Backend>Learning Resources

Effective Haskell

Build efficient applications that exploit the unique benefits of a pure functional language, learning from an engineer who uses Haskell t...

pragprog.com

#pragprog /haskell #published-book /book-effective-haskell

15 7817 1

2022-02-16 10:09:51 UTC

New

Android>Questions

Clipboard readtext not working in android webview

Inside our android webview app, we are trying to paste the copied content from another app eg (notes) using navigator.clipboard.readtext ...

#android #clipboard

1 4678 0

2022-09-27 18:52:03 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 2694 2

2023-02-13 08:43:55 UTC

New

AI>In The News

DeepSeek (671B) running on a cluster of 8 Mac Mini Pros with 64GB RAM each

This is cool! DEEPSEEK-V3 ON M4 MAC: BLAZING FAST INFERENCE ON APPLE SILICON We just witnessed something incredible: the largest open-s...

#ai #macs /deepseek

0 5576 1

2025-01-29 18:43:37 UTC

New

Community>In The Spotlight

AMA with: Mark Volkmann (codebar Winter Lit Fest)

Ask Me Anything with Mark Volkmann @mvolkmann On February 24 and 25, we are giving you a chance to ask questions of PragProg author M...

/book-server-driven-web-apps-with-htmx #codebar-spotlight

37 1880 20

2025-02-26 21:39:39 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)