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## org.modeshape.graph.observe
Interface ObservationBus

All Superinterfaces:
  Observable, Observer

All Known Implementing Classes:
  ClusteredObservationBus, LocalObservationBus

    @ThreadSafe
    public interface ObservationBus

extends Observable, Observer

A simple `Observer` that is itself `Observable`. This interface essentially multiplexes the events from a single Observable to disseminate each event to multiple Observers.

Method Summary
`boolean` | `hasObservers()` Determine whether this particular bus currently has any observers.
`void` | `shutdown()` Unregister all registered observers, and mark this as no longer accepting new registered observers.
`void` | `start()` Prepare this bus for operation by starting any resources.

Methods inherited from interface org.modeshape.graph.observe.Observable
`register, unregister`

Methods inherited from interface org.modeshape.graph.observe.Observer
`notify`

Method Detail

### start

    void start()

  Prepare this bus for operation by starting any resources.

### hasObservers

    boolean hasObservers()

  Determine whether this particular bus currently has any observers.

  Returns:
    true if there is at least one observer, or false otherwise

### shutdown

    void shutdown()

  Unregister all registered observers, and mark this as no longer accepting new registered observers.

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