Book Image

Learning RabbitMQ

By : Martin Toshev
Book Image

Learning RabbitMQ

By: Martin Toshev

Overview of this book

RabbitMQ is Open Source Message Queuing software based on the Advanced Message Queue Protocol Standard written in the Erlang Language. RabbitMQ is an ideal candidate for large-scale projects ranging from e-commerce and finance to Big Data and social networking because of its ease of use and high performance. Managing RabbitMQ in such a dynamic environment can be a challenging task that requires a good understanding not only of how to work properly with the message broker but also of its best practices and pitfalls. Learning RabbitMQ starts with a concise description of messaging solutions and patterns, then moves on to concrete practical scenarios for publishing and subscribing to the broker along with basic administration. This knowledge is further expanded by exploring how to establish clustering and high availability at the level of the message broker and how to integrate RabbitMQ with a number of technologies such as Spring, and enterprise service bus solutions such as MuleESB and WSO2. We will look at advanced topics such as performance tuning, secure messaging, and the internals of RabbitMQ. Finally we will work through case-studies so that we can see RabbitMQ in action and, if something goes wrong, we'll learn to resolve it in the Troubleshooting section.
Table of Contents (18 chapters)
Learning RabbitMQ
About the Author
About the Reviewers

Message router

The following diagram provides an overview of the scenario that we will implement:

Let's say we have a service that triggers an event upon the creation of a new programming seminar, or hackathon, for a given community. We want to send all seminar events to a particular destination receiver and all hackaton events to another destination receiver. Moreover, we want to send messages to the same exchange. For that setup, a topic exchange is a rational choice; one queue will be bound to the topic exchange with the seminar.# routing key and another queue will be bound with hackaton.# routing key. The # character is special and serves as a pattern that matches any character sequence.

We can implement this type of message sending by further extending our Sender class:

private static final String SEMINAR_QUEUE = "seminar_queue";
private static final String HACKATON_QUEUE = "hackaton_queue";    
private static final String TOPIC_EXCHANGE = "topic_exchange";
public void sendEvent(String...