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Pagination for data coming from a OSGi Persistence Service [message #820393]

Wed, 14 March 2012 04:10

Cristiano Gavião

Messages: 279
Registered: July 2009

Senior Member

Hi,

Currently I have a persistence bundle (using gemini JPA + eclipselink) that exposes some business data services. Basically the methods of those services returns collection of entity pojos.

what would be the best approach to use the pagination widget for presenting data from my persistence service?

should I modify the query methods somehow to return just a number of entities at time?

cheers,

Cristiano

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Re: Pagination for data coming from a OSGi Persistence Service [message #825187 is a reply to message #820393]

Tue, 20 March 2012 15:26

Angelo ZERR

Messages: 122
Registered: July 2009

Senior Member

Hi Christiano,

We uses Nebula Pagination Control in our Eclipse RCP/RAP XDocReport http://xdocreport-rap.opensagres.cloudbees.net/xdocreport?startup=fr.opensagres.xdocreport.eclipse.ui.application (and you can browse source at http://code.google.com/p/xdocreport/source/browse/?repo=eclipse)

We uses Eclipse Gemini Blueprint, EclipseLink, JPA but with Spring Data, which is very very impressive (no need to code your JPA Query for CRUD). So I suggest you to use it.

Nebula Pagination Control provides the capability to paginate by using ResultPage structure, but it's extensible and we have created an extension to works with Spring Data Structure (Pageable, Page) (see http://code.google.com/p/xdocreport/source/browse/?repo=eclipse#git%2Fcommons%2Forg.eclipse.nebula.widgets.pagination.springdata)

We have an abstract class SearchDialog http://code.google.com/p/xdocreport/source/browse/commons/fr.opensagres.xdocreport.eclipse.ui/src/fr/opensagres/xdocreport/eclipse/ui/dialogs/SearchDialog.java?repo=eclipse which implements org.eclipse.nebula.widgets.pagination.springdata.ISpringDataPageLoader

(See the code in this classto create the Pagination Control with Spring Data).

Here an example of implementation of SearchDialog http://code.google.com/p/xdocreport/source/browse/dynaresume/org.dynaresume.eclipse.search.ui/src/org/dynaresume/eclipse/search/ui/dialogs/SearchResumeDialog.java?repo=eclipse

public Page<Resume> loadPage(PageableController controller) {
  return resumeService.findByFirstNameAndLastName(firstNameCriteria, lastNameCriteria, (Pageable) controller);
}

This method implements ISpringDataPageLoader to load paginated data with Spring Data.

Hope my explanation will help you.

Regards Angelo

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