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Oleg Zhurakousky
2018-04-09 19:11:32 -04:00
parent 69bfbfbd7a
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@@ -43,9 +43,6 @@ microservices. Spring Cloud Stream provides an opinionated configuration of mess
persistent pub/sub semantics, consumer groups and partitions across several middleware vendors. This opinionated configuration
provides the basis to create stream processing applications and is highly customizable.
By adding `@EnableBinding` to your main application, you get immediate connectivity to a message broker and by adding
`@StreamListener` to a method, you receive events from the message broker.
{% endcapture %}
{% capture main_content %}
@@ -57,11 +54,32 @@ By adding `@EnableBinding` to your main application, you get immediate connectiv
<script type="text/javascript">{% include custom.js %}</script>
{% include download_widget.md %}
As long as Spring Cloud Stream and a Spring Cloud Stream Binder dependencies are on the classpath any Spring Boot application with `@EnableBinding` will bind to the external message broker (e.g. Rabbit MQ or Apache Kafka, depending on the binder-implementation of choice).
As long as Spring Cloud Stream and a Spring Cloud Stream Binder dependencies are on the classpath any Spring Boot application with `@EnableBinding` will bind to the external
message broker (e.g. Rabbit MQ or Apache Kafka, depending on the binder-implementation of choice).
Let's see it in action!
Head over to http://start.spring.io and create a project with the 'Stream Kafka' dependency. Modify the main class as shown below:
We show you how to create a Spring Cloud Stream application that receives messages coming from the messaging middleware of your choice (more on this later) and logs received messages to the console.
We call it `LoggingConsumer`.
While not very practical, it provides a good introduction to some of the main concepts
and abstractions, making it easier to digest the rest of this user guide.
### Create a Sample Application by Using Spring Initializr
To get started, visit the [Spring Initializr](https://start.spring.io). From there, you can generate sample application. To do so:
. In the *Dependencies* section, start typing `stream`.
When the "`Cloud Stream`" option should appears, select it.
. Start typing either 'kafka' or 'rabbit'.
. Select "`Kafka`" or "`RabbitMQ`".
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Basically, you choose the messaging middleware to which your application binds.
We recommend using the one you have already installed or feel more comfortable with installing and running.
Also, as you can see from the Initilaizer screen, there are a few other options you can choose.
For example, you can choose Gradle as your build tool instead of Maven (the default).
. In the *Artifact* field, type 'logging-consumer'.
+
The value of the *Artifact* field becomes the application name.
If you chose RabbitMQ for the middleware, your Spring Initializr should now be as follows:
```java
@SpringBootApplication