IObservable (CMS API 15.2.0 API)

All Superinterfaces:

org.apache.wicket.util.io.IClusterable, Serializable

All Known Subinterfaces:

IClusterConfig, IFieldDescriptor, IModelReference<T>, IObservableModel<T>, IPluginConfig, ITypeDescriptor

All Known Implementing Classes:

AbstractClusterDecorator, AbstractPluginDecorator, BrowserSearchResultModel, BuiltinTypeDescriptor, ClusterConfigDecorator, CssClassAppender, DocumentsProvider, InheritingPluginConfig, JavaClusterConfig, JavaFieldDescriptor, JavaPluginConfig, JavaTypeDescriptor, JcrClusterConfig, JcrNodeModel, JcrObject, JcrPluginConfig, JcrPropertyModel, JcrQueryModel, ModelReference, NodeNameModel, NodePickerPluginConfig, Observable, ObservableModel, ObservablePropertyModel, ObservableTreeModel, StateIconAttributes, TextSearchResultModel, TypeStateAttributes
```
public interface IObservable
extends org.apache.wicket.util.io.IClusterable
```
Interface implemented by observable objects. When multiple different observables are equivalent according to their equals(Object) method, observation is started on one instance.
This interface must be implemented by observable objects, but should not be invoked by plugins.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object obj)`	Equivalence of observables; observation will only be started on one instance.
`int`	`hashCode()`
`void`	`setObservationContext(IObservationContext<? extends IObservable> context)`	Before observation is started on the observable, an observation context is injected by the observer registry.
`void`	`startObservation()`	When the first `IObserver` of this observable is registered with the observer registry, observation is started.
`void`	`stopObservation()`	When the last `IObserver` unregisters, observation is stopped.

- Method Detail
  - setObservationContext
```
void setObservationContext(IObservationContext<? extends IObservable> context)
```
    Before observation is started on the observable, an observation context is injected by the observer registry. This context can be used to notify listeners.
  - startObservation
```
void startObservation()
```
    When the first IObserver of this observable is registered with the observer registry, observation is started. Implementations must notify observers until observation is stopped.
    An implementation should register listeners with external data sources, when appropriate. It is possible for an observable to register as an observer for another observable.
  - stopObservation
```
void stopObservation()
```
    When the last IObserver unregisters, observation is stopped. Any listeners or observers registered by the observable must be unregistered by the implementation.
  - equals
```
boolean equals(Object obj)
```
    Equivalence of observables; observation will only be started on one instance.
    
    Overrides:
    
    equals in class Object
  - hashCode
```
int hashCode()
```
    Overrides:
    
    hashCode in class Object
    
    See Also:
    
    equals(Object)