OSGiService (The Adobe AEM Quickstart and Web Application. 6.6.0)

```
@Target({METHOD,FIELD,PARAMETER})
@Retention(RUNTIME)
@InjectAnnotation
public @interface OSGiService
```
Annotation to be used on either methods, fields or constructor parameters to let Sling Models inject an OSGi service

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`java.lang.String`	`filter`	Specifies the RFC 1960-based filter string, which is evaluated when retrieving the service.
`InjectionStrategy`	`injectionStrategy`	Specifies the injection strategy applied to an annotated element: If set to `InjectionStrategy.REQUIRED`, injection is mandatory. If set to `InjectionStrategy.OPTIONAL`, injection is optional. If set to `InjectionStrategy.DEFAULT` (default), the default injection strategy defined on the `Model` applies. WARNING: Injection strategy is ignored if either `Optional` or `Required` is applied on the same element.
`boolean`	`optional`	Deprecated. Use `injectionStrategy()` instead.

- Element Detail
  - filter
```
java.lang.String filter
```
    Specifies the RFC 1960-based filter string, which is evaluated when retrieving the service. If empty string or left out, then no filtering is being performed.
    
    Returns:
    
    Filter string
    
    See Also:
    
    "Core Specification, section 5.5, for a description of the filter string", RFC 1960
    
    Default:
    
    ""
- - optional
```
@Deprecated
boolean optional
```
    Deprecated.
    Use injectionStrategy() instead.
    
    If set to true, the model can be instantiated even if there is no OSGi service implementation available. Default = false.
    
    Returns:
    
    Optional
    
    Default:
    
    false
- - injectionStrategy
```
InjectionStrategy injectionStrategy
```
    Specifies the injection strategy applied to an annotated element:
    
    If set to InjectionStrategy.REQUIRED, injection is mandatory.
    
    If set to InjectionStrategy.OPTIONAL, injection is optional.
    
    If set to InjectionStrategy.DEFAULT (default), the default injection strategy defined on the Model applies.
    
    WARNING: Injection strategy is ignored if either Optional or Required is applied on the same element.
    Returns:
    
    Injection strategy
    
    Default:
    
    org.apache.sling.models.annotations.injectorspecific.InjectionStrategy.DEFAULT