The Art of Message Queues - TEKX

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Mike Willbanks Sr. Software Engineer at CaringBridge Blog: http://blog.digitalstruct.com Twitter : mwillbanks IRC : lubs ...

Who Am I? <ul><li>Sr. Sofware Engineer at CaringBridge

PHP monkey

MNPHP User Group

Interested in Scalability & Performance </li></ul>

“ Message queues and mailboxes are software-engineering components used for interprocess communication, or for inter-threa...

“ Messaging describes the sending and receiving of data (in the form of messages) between systems. Messages are exchanged ...

Messages are Everywhere

A Basic Message Queue

What are Message Queues <ul><li>A FIFO buffer

Asynchronous push / pull

An application framework for sending and receiving messages.

A way to communicate between applications / systems.

A way to decouple components.

A way to offload work. </li></ul>

Why are Message Queues Useful? <ul><li>Asynchronous Processing

Communication between Applications / Systems

Image Resizing

Video Processing

Sending out Emails

Auto-Scaling Virtual Instances

Log Analysis

The list goes on... </li></ul>

You Might Use a Message Queue If... <ul><li>The request can be fulfilled in the background.

You need to communicate between multiple applications / systems.

You have a limited number of processing slots.

You need to support legacy applications or use multiple programming languages. </li></ul>Good short presentation on why yo...

Going back to Unix <ul><li>“Write programs that work together.”

“Do it in the background.” </li></ul>

Why does that matter? <ul><li>Web systems need to be geared to run things asynchronously.

Distribution may also come into play. </li></ul>

Protocols

Standardized Protocols <ul><li>AMQP – Advanced Message Queue Protocol

STOMP – Streaming Text Oriented Messaging Protocol

XMPP - Extensible Messaging and Presence Protocol </li><ul><li>Related with patches, I will not be going into this. Howev...

AMQP

Overview <ul><li>AMQP Working Group (Community and Vendor)

Platform agnostic protocol.

Completely open, interoperable and broadly applicable.

Many severs available and many client libraries. </li></ul>http://amqp.org For more information on the protocol.

How it works. <ul><li>AMQP utilizes exchanges, queues and bindings.

An exchange is routers with routing tables.

A queue is where the messages wait for a consumer.

A binding defines the routing rules. </li></ul>

In a nutshell....

Some of the Various Servers <ul><li>Apache Qpid - qpid.apache.org

OpenAMQ - openamq.org

RabbitMQ - rabbitmq.com

ZeroMQ - zeromq.org </li></ul>

A PHP Client <ul><li>php-rabbit – code.google.com/p/php-rabbit </li><ul><li>Looks like it will become a PECL package at so...

Installation can be a bit painful since the c client needs to be linked. </li></ul></ul>

Exchanges <ul><li>Fanout Exchange </li><ul><li>No routing keys involved. Any message that is sent to the exchange is sent...

Enough Text, lets see a picture

Your First Queue <ul><li>An exchange, queue and bindings must be defined first. Publishing can then commence after. </li>...

Create the exchange

Bind to the queue. </li></ul></ul>

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