On Feb 9, 2010, at 6:44 PM, Moiz Dohadwala wrote:
> Paul,
>
> Thanks. I was leading that way myself. My concern regarding using
> jaxb fragments for streaming was the ability to marshal to json
> seamlessly. I guess I will find out.
>
You should be able to do that if you return a collection with a lazy
iterator implementation.
The StreamingOutput can work for XML or JSON but you need to do that
work using JSONJAXBContext when JSON is used. Or say using Jackson
instead.
Paul.
> -Moiz
>
> -----Original Message-----
> From: Paul.Sandoz_at_Sun.COM [mailto:Paul.Sandoz_at_Sun.COM]
> Sent: Tuesday, February 09, 2010 9:06 AM
> To: users_at_jersey.dev.java.net
> Subject: Re: [Jersey] using jaxb to stream a large data set
>
>
> On Feb 9, 2010, at 1:15 AM, Moiz Dohadwala wrote:
>
>> Hello,
>>
>> We am currently using jersey to build a set of reports. The reports
>> on the UI are paginated, since the data set can potentially be very
>> large. However, we need to provide a download option to allow the
>> user to download the entire set. Currently we have been using jaxb
>> to provide support for xml as well as json. What options to we have
>> to support streaming streaming using jaxb in jersey?
>>
>
> JAXB is not a streaming-based API so i guess any approach would be to
> utilize "fragments" of JAXB.
>
> The only current support for fragments of JAXB is returning a List<T>
> or Collection<T> (and it would be really easy to extend to support
> Iterator<T>).
>
> You could implement a Collection that supports a lazy iterator.
>
> Alternatively you could implement the JAXB fragment marshaling
> yourself using StreamingOutput [1].
>
> Paul.
>
> [1] https://jsr311.dev.java.net/nonav/javadoc/javax/ws/rs/core/StreamingOutput.html
>
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