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# Apache Karaf SCR example

## Abstract

SCR (Service Component Runtime) is a convenient way to use services with annotations.

As it's part of the OSGi compendium specification, you don't need any large dependency to use it.

## Artifacts

* **karaf-ds-example-api** provides the `BookingService` interface and `Booking` POJO.
* **karaf-ds-example-provider** implements and exposes a `BookingService` using Component annotations.
* **karaf-ds-example-client** uses a `BookingService` reference injected thanks to Reference annotations.
* **karaf-ds-example-features** contains a Karaf features repository used for the deployment.

## Build

Simply use Apache Maven:

```
mvn clean install
```

## Features and Deployment

On a running Karaf instance, you register the example features repository with:

```
karaf@root()> feature:repo-add mvn:org.apache.karaf.examples/karaf-scr-example-features/4.2.1-SNAPSHOT/xml
```

Then, you can install the `karaf-scr-example-client` feature:

```
karaf@root()> feature:install karaf-scr-example-client
```

This feature installs the `karaf-scr-example-provider` feature providing the service, and the client bundle.

## Usage

When you install the client feature, you should see on the console:

```
karaf@root()>                                                                                                                                                                                     
-----------
1 - AF520 - John Doe

-----------
2 - AF59 - Alan Parker

```