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


http://videlalvaro.github.com

http://videlalvaro.github.com

http://twitter.com/old_sound

http://twitter.com/old_sound

About Me

Co-authored

RabbitMQ in Action

http://bit.ly/rabbitmq




RabbitMQ


Quick Demo


RabbitMQ Boot Steps

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




RabbitMQ Boot Steps

Take care of starting the many sub systems that compose RabbitMQ

respecting order and dependencies


RabbitMQ Boot Steps

Take care of starting the many sub systems that compose RabbitMQ

respecting order and dependencies

brainchild of @leastfixedpoint


Subsystems

• external infrastructure

• kernel (rabbit kernel)

• core

• routing


RabbitMQ Boot Steps


RabbitMQ Boot Steps

-rabbit_boot_step({recovery, [{description,

"exchange, queue and binding recovery"},

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


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


RabbitMQ Boot Steps

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

Grouping Boot Steps


RabbitMQ Boot Steps

How do they actually work?


Magic


Erlang Modules

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


Module Attributes

-Tag(Value).


RabbitMQ Boot Steps

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


RabbitMQ Boot Steps

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


RabbitMQ Boot Steps

• Add order

• Add flexibility

• Very powerful tool

• Hidden gem in the Erlang world


Thanks!


rabbitmq boot system

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