Chapters

48 Chapters | 5:05:05 |

01

Installing Messenger

6:15
02

Message, Handler & the Bus

8:36
03

Doing Work in the Handler

6:32
04

Message, Handler & debug:messenger

5:51
05

Transport: Do Work Later (Async)

7:33
06

Worker Command

5:34
07

Problems with Entities in Messages

4:53
08

Passing Entity Ids inside of Messages

8:00
09

Dispatching a Message inside a Handler?

5:30
10

Partial Handler Failures & Advanced Routing

4:35
11

Envelopes & Stamps

6:23
12

Retrying on Failure

5:11
13

Retry Delay & Retry Strategy

4:40
14

The Failure Transport

5:37
15

Investigating & Retrying Failed Messages

5:41
16

Middleware

5:59
17

Tracking Messages with Middleware & a Stamp

5:31
18

Logger Channel Setup and Autowiring

5:26
19

Middleware Message Lifecycle Logging

7:47
20

High Priority Transports

5:40
21

Handling Messages Sync while Developing

5:54
22

Functional Test for the Upload Endpoint

9:22
23

Testing with the "in-memory" Transport

5:26
24

Deployment & Supervisor

9:08
25

Killing Workers Early & on Deploy

5:55
26

Events & Event Bus

5:22
27

Creating & Handling Events

7:55
28

Dispatching the Event & No Handlers

7:06
29

Messenger vs EventDispatcher

3:18
30

Doctrine Transaction & Validation Middleware

5:58
31

Event & Command Bus Organization

7:23
32

Query Bus

8:47
33

Advanced Handler Config: Handler Subscribers

7:58
34

Sending Handlers to Different Transports: from_transport

3:21
35

AMQP with RabbitMQ

7:22
36

AMQP Internals: Exchanges & Queues

8:10
37

AMQP Priority Exchange

7:15
38

Delaying in AMQP: Dead Letter Exchange

7:23
39

Exchange Routing and Binding Keys

6:38
40

Dynamic AMQP Routing Key (AmqpStamp)

7:50
41

Serializing Messages as JSON

6:41
42

JSON, Message Headers & Serializer Options

3:15
43

Setup for Messages from an Outside System

6:01
44

Transport for Consuming External Messages

5:51
45

Custom Transport Serializer

6:33
46

The Lifecycle of a Message & its Stamps

8:16
47

Graceful Failure in the Transport Serializer

4:47
48

Mapping Messages to Classes in a Transport Serializer

4:56

> Symfony 5 > Messenger! Queue work for Later

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38.

Delaying in AMQP: Dead Letter Exchange

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9 Comments

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Dang 3 years ago

Hi guys,
In this tutorial, you use the doctrine to store failures messages. Why you don't store them in RabbitMq with that x-dead-letter-exchange ? Is there any specific reason ? Thanks

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MolloKhan SFCASTS Dang 3 years ago edited

Hey @Dang

Yea, you can store your failed messages in RabbitMq as well but we kept using Doctrine just for simplicity reasons.

Cheers!

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danresmejia 5 years ago

Hi, guys. As always great course, one of your finest.

Can a message be delayed for a whole month? My use case is to schedule a task to check in a month if a notification has been read and if not delete it. Would this AMQP delays would be useful for such a task?

Thanks a lot

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weaverryan SFCASTS danresmejia 5 years ago edited

Hey danresmejia!

> Can a message be delayed for a whole month?

Ha! That's a fun question :). Umm... maybe? I think this is not the normal use-case. It might work in theory (you'd need to make sure AMQP is "persistent" so that messages aren't lost on shutdown), but I'm not sure this would be wise. I could *totally* be wrong and maybe this is normal, I just haven't heard of amqp being used with such long delays. Personally, I would probably do this with a custom console command that "checks for all unread messages that are older than 1 month" and deletes them. Then I'd run that on a CRON job as often as you need :).

Cheers!

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danresmejia weaverryan 5 years ago

Thanks for getting back to me. A cron job is what I do now, it works fine until it doesn't ;) and then debugging is hard. Also everything we do is in a multi tenant context so the command needs to check every notification for every tenant as each tenant lives in a different data base. For me it seems that a message on an async queue is the perfect choice as I'd know that for every created notification a message would be also created to check it validity in a month.

Also is important to point out that on the JMS Job Queue we had such feature, i.e. a message would only be processed on an specific date and time if such thing is needed. In that regard I see that doctrine transport table has a field called 'available_at' it seems to be related to it. What do you thing?

One last idea is to have the handler sending a message to the event bus if the notification is not yet ready to be deleted, not old enough. It could be an alternative if the AMQP implementation doesn't persist delayed messages over reboots or outages.

Cheers!

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weaverryan SFCASTS danresmejia 5 years ago edited

Hey danresmejia!

> In that regard I see that doctrine transport table has a field called 'available_at' it seems to be related to it. What do you thing?

Especially with the Doctrine transport, I certainly can't see a problem with super-delayed messages like this (I'm less certain about how appropriate this is with AMQP).

So... I think it would be fine to run with this :).

Cheers and sorry for the slow reply!

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danresmejia weaverryan 5 years ago edited

Thanks weaverryan !

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php-programmist 6 years ago

Hi, thank you for great totorials!
There is wrong command at this page:
php bin/console -vv async_priority_high async
Insted of:
php bin/console messenger:consume -vv async_priority_high async

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sadikoff php-programmist 6 years ago edited

Hey php-programmist

Good catch! Thanks!

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This tutorial is built with Symfony 4.3, but will work well on Symfony 4.4 or 5.

Symfony 4.3

What PHP libraries does this tutorial use?

// composer.json
{
    "require": {
        "php": "^7.1.3",
        "ext-ctype": "*",
        "ext-iconv": "*",
        "composer/package-versions-deprecated": "^1.11", // 1.11.99
        "doctrine/annotations": "^1.0", // v1.8.0
        "doctrine/doctrine-bundle": "^1.6.10", // 1.11.2
        "doctrine/doctrine-migrations-bundle": "^1.3|^2.0", // v2.0.0
        "doctrine/orm": "^2.5.11", // v2.6.3
        "intervention/image": "^2.4", // 2.4.2
        "league/flysystem-bundle": "^1.0", // 1.1.0
        "phpdocumentor/reflection-docblock": "^3.0|^4.0", // 4.3.1
        "sensio/framework-extra-bundle": "^5.3", // v5.3.1
        "symfony/console": "4.3.*", // v4.3.2
        "symfony/dotenv": "4.3.*", // v4.3.2
        "symfony/flex": "^1.9", // v1.21.6
        "symfony/framework-bundle": "4.3.*", // v4.3.2
        "symfony/messenger": "4.3.*", // v4.3.4
        "symfony/property-access": "4.3.*", // v4.3.2
        "symfony/property-info": "4.3.*", // v4.3.2
        "symfony/serializer": "4.3.*", // v4.3.2
        "symfony/validator": "4.3.*", // v4.3.2
        "symfony/webpack-encore-bundle": "^1.5", // v1.6.2
        "symfony/yaml": "4.3.*" // v4.3.2
    },
    "require-dev": {
        "easycorp/easy-log-handler": "^1.0.7", // v1.0.7
        "symfony/debug-bundle": "4.3.*", // v4.3.2
        "symfony/maker-bundle": "^1.0", // v1.12.0
        "symfony/monolog-bundle": "^3.0", // v3.4.0
        "symfony/stopwatch": "4.3.*", // v4.3.2
        "symfony/twig-bundle": "4.3.*", // v4.3.2
        "symfony/var-dumper": "4.3.*", // v4.3.2
        "symfony/web-profiler-bundle": "4.3.*" // v4.3.2
    }
}

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