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From Mark Struberg <strub...@yahoo.de>
Subject Re: Instance<X> and @Disposes
Date Mon, 23 Jun 2014 14:40:55 GMT
Hi Xavier!

Short answer: NormalScoped beans have their own lifecycle and will get destroyed whenever
the Context ends. Eg. for @RequestScoped FTPClient it will get destroyed at the end of each
request.

For @Dependent scoped contextual instances we store the CreationalContext with the bean containing
the outermost Instance.


As I understand your method @Produces FTPClient newFTPClient() creates a @Dependent scoped
FTPClient, right?

In this case the @Disposes method for all FTPClients created over time will get called when
your @Stateless MyService gets disposed. This happens if e.g. the container shuts down, if
the instance gets removed from the pool or (in some containers) if the pool timeout exceeds
(some containers only keep pooled @Stateless instances for 6000 seconds and then create fresh
ones).


Any further questions? Just keep asking :)


LieGrue,
strub



On Monday, 23 June 2014, 16:26, Xavier Dury <kalgon@hotmail.com> wrote:


>
>
>Hi,
>
>I was wondering how an object provided by an Instance<X> could be
>disposed through the correct @Disposes method without explicitly
>calling that method.
>
>For example:
>
>public class FTPClientProducer {
>
>    @Produces
>    FTPClient newFTPClient() {...}
>
>    void closeFTPClient(@Disposes FTPClient ftpClient) {...}
>}
>
>@Stateless
>public class MyService {
>
>    @Inject
>    Instance<FTPClient> ftpClientProvider;
>
>    void doSomething() {
>        FTPClient ftpClient = ftpClientProvider.get();
>        try {
>           ...
>        } finally {
>           ??? (close ftpClient )
>        }
>    }
>}
>
>Ideally, I would like to replace ??? by something like:
>
>ftpClientProvider.dispose(ftpClient);
>
>Is there something in CDI which provides that kind of feature?
>
>Regards,
>
>Xavier                           
>
>

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