Building RabbitMQ based Chat on

barter.li Android App

Why RabbitMQ for Chat

● Fast, reliable, guaranteed & scalable chat

● Mobile, Web compatibility

● Messages, pics, audio, video transfer etc.

● No dependence on Google services

RabbitMQ

● Uses AMPQ protocol

● Built with Erlang

Founded by Rabbit Technologies in year 2007

Why AMPQ

● IBM MQSeries

● Microsoft Message Queue

● Java Message Service

Other Vendors

● Apache qpid

● Apache apollo

● Windows Azure Service Bus

AMPQ

● Started by JPMorgan Chase with iMatix Corporation and

evolved to develop an open standard

● Allows different MQ vendors communicate with each other

Why Erlang?

● Developed by Ericsson

● Good at distributed computing

● Used by Facebook, What’s App

● Open Telecom Platform

Important Things

● Queues

● Exchanges

● Bindings

Exchanges

● Topic

● Fanout

● Direct

● Headers

Android and Rabbitmq

● The java client library is not mobile optimized

● Unreliable tcp (Transmission Control Protocol) connection

● Heavy weight

Issues Faced

● Need to handle frequent tcp connection failure

● Different device login and round robin issues

● Maybe not meant for chat

Solution

● Heartbeat for tcp issues

● Unique queue names for different devices with same id.

● Fanout messaging

Alternatives

● MQTT: Message Queuing Telemetry Transport

● Faye: Simple pub/sub messaging

References

● https://groups.google.com/forum/#!forum/ruby-amqp

● http://www.linkedin.com/groups/RabbitMQ-2830653

● https://github.com/intrepidkarthi/RabbitMQ-Android-Chat

● http://rubyamqp.info/

● rabbitmq.1065348.n5.nabble.com/previous-connection-is-NOT-automatically-

closed-if-IP-different-td31096.html

Android

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Design

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ROR

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