| --- |
| layout: post |
| status: PUBLISHED |
| published: true |
| title: Using annotations in Turbine 4 |
| id: d9aaccaa-503c-468a-b696-626f7e41453d |
| date: '2016-01-08 13:59:42 -0500' |
| categories: turbine |
| tags: |
| - annotation |
| - turbine |
| permalink: turbine/entry/using_annotations_in_turbine_4 |
| --- |
| <p>The Milestone 2 release of Turbine 4 has added support for dependency injection into modules and valves using annotations. This can simplify your code a lot. Consider a screen template thats uses some Turbine service:</p> |
| <pre>...
|
| protected void doBuildTemplate(RunData data, Context context)
|
| {
|
| // Get service instance
|
| MyService myservice = (MyService) TurbineServices
|
| .getInstance().getService(MyService.SERVICE_NAME);
|
|
|
| // do something
|
| myservice.doSomething(...)
|
| ...
|
| }
|
| </pre> |
| <p>Looks a bit complicated, doesn't it? Now with Turbine annotations, you simply do </p></p> |
| <pre>...
|
| <span style="color: rgb(255, 0, 0);">@TurbineService
|
| private MyService myservice;
|
| </span>
|
| protected void doBuildTemplate(RunData data, Context context)
|
| {
|
| // do something
|
| myservice.doSomething(...)
|
| ...
|
| }
|
| </pre> |
| <p>In addition to services, the annotations <tt>@TurbineConfiguration</tt> and <tt>@TurbineLoader</tt> inject instances of the<br /> |
| Turbine configuration or subsets of it and the Assembler loaders for a certain page, screen or action.</p> |
| <p>See the </p> |
| <ul style="margin: 0px; padding: 0px; font-size: small; font-family: Verdana, Helvetica, Arial, sans-serif;"> |
| <li class="none" style="font-size: smaller; list-style-type: none; background-image: none; padding-left: 16px; list-style-position: outside; line-height: 1.2em; text-indent: -1em; margin-left: 1em; background-position: 0px 0.4em; background-repeat: no-repeat no-repeat;"><strong><a href="http://turbine.apache.org/turbine/turbine-4.0-M2/howto/annotations.html" target="_blank" title="Annotations Howto">Annotations Howto</a></strong></li> |
| </ul> |
| <p> for the documentation of these features.</p> |
