Enterprise Integration Patterns Demo - Introduction to Messaging Patterns

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Requirements

1. python 2.7+
2. Install pip: sudo easy_install pip
3. Install virtualenv: pip install virtualenv
4. Install virtualenvwrapper: pip install virtualenvwrapper
5. Install Rabbit MQ Server Mac Distro

Get environment Set-up

1. Create Your Virtual Environment
   

$ mkvirtualenv eip_demo

2. Activate virtual environment
   

$ workon eip_demo

3. Install requirements
   

$ cd eip_demp

``` $ pip install -r requirements.txt ```

4. Start rabbitmq in a new window
   

$ rabbitmq-server

A few commands

1. Access RabitMQ Admin UI:
2. Shutdown RabbitMQ Server: Ctrl+C in server window then k
3. Exit Virtual env deactivate eip_demo

The Examples

1. Simple Send/Receive
   

Producer sends messages to the "hello" queue. The consumer receives messages from that queue.

2. Work Queue
   

The main idea behind Work Queues (aka: Task Queues) is to avoid doing a resource-intensive task immediately and having to wait for it to complete. Instead we schedule the task to be done later. We encapsulate a task as a message and send it to the queue. A worker process running in the background will pop the tasks and eventually execute the job. When you run many workers the tasks will be shared between them.

3. Publish-Subscribe
   

Deliver a message to multiple consumers registered on a particular channel. This pattern is known as "publish/subscribe".

4. Content Based Routing
   

Route messages to the appropriate Message Queue based on message identifier (routing key).

5. Topic Based Exchanges/Queues
   

Route messages based on complex routing key allowing for wild cards (* 1 wild card word, # 0 or more wild-card words) This pattern can have the specificity of a direct, point-to-point channel or also function like a pub-sub channel or both, depending on how queue’s are configured on the channel.

Running Examples

See notes and comments in respective client/server files.

Additional Reference Materials

RabbitMQ Documentation

Kombu

AMQP Reference

EIP Book

EIP Refrence

More Tutorials/Examples

RabbitMQ

Kombu