- You should use one or the other - if you use WCMUse/WCMUsePojo - then do not use SLing Models. If you want to use SLing Models - then do not use WCMUse/WCMUsePojo.
- Both provide the same functionality so no use of using both.
- WCMUse is deprecated in 6.1. Use WCMUsePojo instead.
Now let’s look at the implementation for this, you have 5(!) options:
- Class that implements the Use interface (deprecated)
- Class that extends WCMUsePojo class
- Class that is adaptable from Resource (resource.adaptTo(YourClass))
- Class that is adaptable from Request (request.adaptTo(YourClass))
- Sling Models
Both 3,4 are usefull when you implement AdapterFactory interface. These 2 can be ignored.
Inject annotation issue in Sling models AEM 6.2
Read here - http://aemconcepts.blogspot.com/2017/07/sling-model-inject-annotation-issue-in.htmlSling models
- Sling models can be created using model annotation which automatically adapts your request or resource.
- Doesn’t provide any activate method. Activate method is treated just like another method.
- Method have @PostConstruct annotation does not need to be called using a use object. It gets called automatically after all injections are done. Once you edit and save dialog injections happen again hence method with this annotation is called again.
- Style object currentStyle is also only available through the SlingHttpServletRequest as an injection and not thru adapting to a resource. But in adaptable from resource we can get it by adapting resource.
Available injectors for sling models.
Inject resource resolver
@Inject
private ResourceResolver resourceResolver;
@named annotation
Injects are
injected as instance variables with same name as the property. Both if you want
different property name and instance name then this annotation can be used. For
example
/** The news filter tags. */
@Inject
This inject newsfiltertags property value in newsFilterTags instance variable.
Sling model adaptable from request
@Model(adaptables =
SlingHttpServletRequest.class, defaultInjectionStrategy =
DefaultInjectionStrategy.OPTIONAL)
Retrieve resource
To retrieve resource.
- request.getResource();
- Inject
@Source("script-bindings") [optional] private Resource resource;
To inject Style for design
@Inject
private Style currentStyle;
Sling model adaptable from resource
@Model(adaptables = Resource.class, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
public class LoginSplashScreenModel {…}
Get Style object to retrieve from
design
TagManager = resourceResolver.adaptTo(TagManager.class);
designer = this.resourceResolver.adaptTo(Designer.class);
if (designer != null) {
style = designer.getStyle(resource);
}
if (StringUtils.isEmpty(viewAllTitle)) {
viewAllTitle = style.get("viewalltitle", String.class);
}
Passing Parameters from slightly to sling models.
To show the full range of possibilities, let’s also pass a
parameter, so the content of the data-sly-use attribute must be changed to an
expression with an option:
<div
data-sly-use.myComponent="${'com.myproject.MyComponent' @ param1='one',
param2='two'}">
${myComponent.calculatedValue}
</div>
WCMUsePojo/WCMUse
·
Provides convenience method activate() which is called from wcmusepojo.init() once all injections
are done. Implement this method to perform post
initialization tasks.
· Method activate does not need to be called using
a use object. It gets called automatically after all injections are done.
@Override
activate(){..}
