tags	projects
messaging rabbitmq	spring-amqp

Table of Contents

• What you’ll build
• What you’ll need
• Set up the project
• Create a service
• Create the service implementation
• Create a RabbitMQ RPC server application
• Create a RabbitMQ RPC client application
• Create a RabbitMQ RPC client
• Summary

This guide walks you through the process of setting up a RabbitMQ AMQP server and clinet for RPC calls.

What you’ll build

You’ll build an server application and a client application that calls the server using Spring AMQP’s RabbitTemplate.

What you’ll need

https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/prereq_editor_jdk_buildtools.adoc

+ - RabbitMQ server (installation instructions below)

https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/how_to_complete_this_guide.adoc

Set up the project

https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/build_system_intro.adoc

https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/create_directory_structure_hello.adoc

https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/create_both_builds.adoc

build.gradle

link:initial/build.gradle[role=include]

https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/spring-boot-gradle-plugin.adoc

Before you can build your messaging application, you need to set up the server that will handle receiving and sending messages.

RabbitMQ is an AMQP server. The server is freely available at http://www.rabbitmq.com/download.html. You can download it manually, or if you are using a Mac with homebrew:

brew install rabbitmq

Unpack the server and launch it with default settings.

rabbitmq-server

You should see something like this:

            RabbitMQ 3.1.3. Copyright (C) 2007-2013 VMware, Inc.
##  ##      Licensed under the MPL.  See http://www.rabbitmq.com/
##  ##
##########  Logs: /usr/local/var/log/rabbitmq/rabbit@localhost.log
######  ##        /usr/local/var/log/rabbitmq/rabbit@localhost-sasl.log
##########
            Starting broker... completed with 6 plugins.

Create a service

src/main/java/hello/CalculationService.java

link:complete/src/main/java/hello/CalculationService.java[role=include]

Create the service implementation

src/main/java/hello/CalculationServiceImpl.java

link:complete/src/main/java/hello/CalculationServiceImpl.java[role=include]

Create a RabbitMQ RPC server application

src/main/java/hello/ServerApplication.java

link:complete/src/main/java/hello/ServerApplication.java[role=include]

Create a RabbitMQ RPC client application

src/main/java/hello/ClientApplication.java

link:complete/src/main/java/hello/ClientApplication.java[role=include]

Create a RabbitMQ RPC client

src/main/java/hello/Client.java

link:complete/src/main/java/hello/Client.java[role=include]

Run the server application, than run the client application. You should see output like this:

91 + 96 =187.0
78 + 21 =99.0
60 * 59 =3540.0
91 + 49 =140.0
16 + 70 =86.0
34 * 91 =3094.0
32 + 97 =129.0

Summary

Congratulations! You’ve just developed a simple RPC server and client application with Spring and RabbitMQ. There’s more you can do with Spring and RabbitMQ than what is covered here, but this should provide a good start.