Add rebind method to JndiRmiServiceExporter to allow rebinding the service to a naming service [SPR-3048]

[spring-projects-issues]

Christian Haselbach opened SPR-3048 and commented

Currently it is not (or hardly) possible with JndiRmiServiceExporter to rebind a serivce to a naming service.
This is useful if you use a naming service which does not persist its registry when it restarts.
All that is missing is the following method:
public void rebind() throws NamingException {
this.jndiTemplate.rebind(this.jndiName, this.exportedObject);
}
(The last line of prepare sould probably replaced by "rebind()".)

Alternatively, public getter for exportedObject could be provided which would allow to implement this somewhere else.

---

Affects: 2.0 final, 2.0.1, 2.0.2

[spring-projects-issues]

Juergen Hoeller commented

So what you have in mind here is an explicit public method that performs the rebinding? I assume you would trigger that method in a custom fashion, based on some notification that your application receives?

We could consider generic support for such reinitialization of service exports, potentially through Spring 2.0's Lifecycle interface. Remote exporters could support Lifecycle's stop/start methods, for example, unbinding and rebinding the service object correspondingly.

Juergen

[spring-projects-issues]

Christian Haselbach commented

Yes, a rebinding is performed in custom fashion. Right now I have a custom class which is a patched version of JndiRmiServiceExporter with the proposed changes. The idea is to check every now and then whether the service is still registered in the naming service and rebind if this is not the case. For tests rebind is just called via timer task every n seconds (w/o check). This works just fine.

The use case is a scenario where you use a naming service which is not under your control, does not persist, and which might crash or restart without prior notice.

Christian

P.S.: Thanks for the fast response.

[spring-projects-issues]

Juergen Hoeller commented

I've added such a "rebind()" method to JndiRmiServiceExporter. This should be available in the next 2.0.3 snapshot (http://www.springframework.org/snapshots).

Juergen