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  10. Events

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10. Events

The NMR has a rich event API that can be used to receive all sort of notifications about what's happening in the NMR.
Currently, two types of listeners are defined.

EndpointListener

Code Block
public interface EndpointListener {
    void endpointRegistered(InternalEndpoint endpoint);
    void endpointUnregistered(InternalEndpoint endpoint);
}

You can find an example endpoint listener here.

ExchangeListener

Code Block
public interface ExchangeListener {
    void exchangeSent(Exchange exchange);
    void exchangeDelivered(Exchange exchange);
    void exchangeFailed(Exchange exchange);
}

An example exchange listener can be found here.

Registering listeners

Listeners can be registered in two ways, either directly on the NMR:

Code Block
nmr.getListenerRegistry().register(listener, null);

or by registering your listener as an OSGi service. It can be done using Spring-DM using the following configuration (for an exchange listener):

Code Block
<bean id="myListener" class="...">
  ...
</bean>

<!-- Exchange Listener -->
<osgi:service ref="myListener"> 
    <osgi:interfaces>
        <value>org.apache.servicemix.nmr.api.event.ExchangeListener</value>
        <value>org.apache.servicemix.nmr.api.event.Listener</value>
    </osgi:interfaces>
</osgi:service>

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