Rabbitmq Boot System

RabbitMQ Boot SystemAlvaro Videla - Zürich Erlang User Group

Wednesday, December 12, 12

About Me• Developer Advocate for Cloud Foundry

• Blog: http://videlalvaro.github.com/

• Twitter: @old_sound

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About Me

Co-authored

RabbitMQ in Action

http://bit.ly/rabbitmq

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RabbitMQ

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Quick Demo

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RabbitMQ Boot Steps

https://github.com/videlalvaro/rabbit-internals/blob/master/rabbit_boot_process.md

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RabbitMQ Boot Steps

Take care of starting the many sub systems that compose RabbitMQ

respecting order and dependencies

Wednesday, December 12, 12

RabbitMQ Boot Steps

Take care of starting the many sub systems that compose RabbitMQ

respecting order and dependencies

brainchild of @leastfixedpoint

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Subsystems

• external infrastructure

• kernel (rabbit kernel)

• core

• routing

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RabbitMQ Boot Steps

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RabbitMQ Boot Steps

-rabbit_boot_step({recovery, [{description,

"exchange, queue and binding recovery"},

{mfa, {rabbit, recover, []}}, {requires, empty_db_check}, {enables, routing_ready}]}).

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RabbitMQ Boot Steps

-rabbit_boot_step({msg_store_bitcask_index, [{description, "Bitcask Index for rabbit_msg_store"}, {mfa, {application, set_env, [rabbit, msg_store_index_module, ?MODULE]}}, {enables, recovery}]}).

Modify Configuration at Startup

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RabbitMQ Boot Steps

-rabbit_boot_step({external_infrastructure, [{description, "external infrastructure ready"}]}).

Grouping Boot Steps

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RabbitMQ Boot Steps

How do they actually work?

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Magic

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Erlang Modules

-module(m). % module attribute-export([fact/1]). % module attribute-behaviour(Behaviour). % module attribute

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Module Attributes

-Tag(Value).

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RabbitMQ Boot Steps

- rabbit_misc:all_module_attributes/1- rabbit_misc:module_attributes/1

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RabbitMQ Boot Steps

- rabbit:boot_steps/0- rabbit:sort_bootsteps/1- rabbit_misc:build_acyclic_graph/3

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RabbitMQ Boot Steps

• Add order

• Add flexibility

• Very powerful tool

• Hidden gem in the Erlang world

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Thanks!

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