Hi Paul
Thanks so much! This was exactly what I needed. I used the
CloseableService: which works beautifully.
I hope your response will make it out to the search engines (e.g.
Google) - best thing available!
David
Paul Sandoz wrote:
> Hi,
>
> A response filter is not really suitable for cleanup because it is not
> guaranteed to get called if an exception is thrown from a request
> filter (or the resource) and that exception is passed through to the
> container. See:
>
>
> https://jersey.dev.java.net/nonav/apidocs/1.1.2-ea/jersey/com/sun/jersey/api/container/filter/package-summary.html
>
>
> There are three choices:
>
> 1) Register a ServletRequestInitializer:
>
>
> http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletRequestListener.html
>
>
> This is obviously specific to servlet so may not be ideal.
>
> 2) Use @PreDestroy on a resource class (which does work for all
> supported scopes).
>
> 3) Use the CloseableService:
>
>
> https://jersey.dev.java.net/nonav/apidocs/1.1.2-ea/jersey/com/sun/jersey/spi/CloseableService.html
>
>
> You can inject the CloseableService:
>
> @Context CloseableService cs;
>
> and then register instances of Closeable:
>
> Closeable c = ...
> cs.add(c);
>
> The Jersey multipart module, specifically the message body reader
> for multipart messages uses the
> Closeable service such that temporary files that are cached body
> parts are cleaned up.
>
>
> All of the above are guaranteed to be processed regardless of
> Exceptions being thrown.
>
> Paul.
>
>
> On Nov 4, 2009, at 11:45 PM, dloy wrote:
>
>> Sorry to be slow on this.
>>
>> I haven't found a working code example on the web.
>> <http://n2.nabble.com/Filters-td2285491.html> is about as close as I
>> could find.
>> <http://n2.nabble.com/ContainerResponseFilter-is-not-suitable-for-cleanup-job-td2312274.html>
>> is far from encouraging.
>>
>> The javadoc for ContainerResponseFilter has:
>> A filter for filtering a response after the response is returned from
>> a resource class and before the response is written to the container.
>>
>> The comment "before the response is written" implies (to me) that the
>> ContainerResponseFilter is called before the response is sent and/or
>> that the implementation must write out the response. Knowing some of
>> these details for how to do a cleanup following the transmission of a
>> response would be very useful. Also, are there other changes (web.xml?)
>>
>> Does the @PreDestroy annotated method work?
>>
>> Any help on this would be much appreciated.
>>
>> Thanks
>> David
>>
>>
>>
>> Craig McClanahan wrote:
>>> On Wed, Nov 4, 2009 at 12:47 PM, Moises Lejter <moilejter_at_gmail.com>
>>> wrote:
>>>
>>>> Would a CleanupFilter work? They get call "around" each HTTP request,
>>>> right?
>>>>
>>>
>>> More precisely, you'll want to take a look at ContainerResponseFilter
>>> (for cleanup after the resource method returns) and perhaps
>>> ContainerRequestFilter (to initialize things on the way in). It's
>>> also possible to have a single Filter instance that implements both
>>> interfaces if you need "around" type functionality. Note that, in
>>> addition to cleanup, you can actually modify the response entity or
>>> headers in a ContainerResponseFilter.
>>>
>>> There are some gotchas to be aware of if your resource method might
>>> throw exceptions ... Google these class names for more info.
>>>
>>> Craig
>>>
>>>
>>>> Moises
>>>>
>>>> On Wed, Nov 4, 2009 at 1:02 PM, dloy <david.loy_at_ucop.edu> wrote:
>>>>
>>>>> I would like to do cleanup after a Jersey request completes (e.g.
>>>>> delete
>>>>> temporary files, ...). Does Jersey provide any mechanism for
>>>>> running a
>>>>> process at the completion of an http request?
>>>>>
>>>
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>>
>>
>>
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>
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