UIEventTopic (Eclipse Platform API Specification)

```
@Qualifier
@Documented
@Target({FIELD,PARAMETER})
@Retention(RUNTIME)
public @interface UIEventTopic
```
This annotation can be applied to arguments and fields that want to receive notifications on the specified event topic. Method containing such arguments will be called on the main thread.
Normally EventTopic annotations will be marked as optional. Those annotations establish a link rather then provide a value at the time of injection.

Example usage:
```
   public class Car {
     @Inject
     void handle(@Optional @UIEventTopic("org/eclipse/e4/some/event/topic") Payload payload);
     ...
   }
 
```
Since:

1.0

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  java.lang.String value

- Element Detail
  - value
```
java.lang.String value
```
    Default:
    
    ""