How do make my PageLoader run in a Eclipse Job? - Stack Overflow

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I am trying to emulate my 'PaginationService' as it would need to go to the server to get the data page at a time, which could take a long time, so I want to put it in an eclipse job to run(so user sees progress job running and not locking up the UI) and inform the caller of the method when its come back, the loadPage() method , is it possible and how?

import java.util.ArrayList;
import java.util.List;

import org.eclipse.nebula.widgets.pagination.IPageLoader;
import org.eclipse.nebula.widgets.pagination.PageableController;
import org.eclipse.nebula.widgets.pagination.collections.PageListHelper;
import org.eclipse.nebula.widgets.pagination.collections.PageResult;
import org.eclipse.nebula.widgets.pagination.example.model.NebulaWidget;
import org.eclipse.nebula.widgets.pagination.example.model.Person;

public class PaginationService implements IPageLoader<PageResult<NebulaWidget>> {


private List<NebulaWidget> widgets;


public PaginationService() {
    this.widgets = new ArrayList<NebulaWidget>();
    
}

//@Override
public PageResult<NebulaWidget> loadPage(PageableController controller) {
    int currentPage = controller.getCurrentPage();
    int pageOffset = controller.getPageOffset();
    switch (pageOffset) {
    case 10: {
        this.widgets = new ArrayList<NebulaWidget>();
        loadpage2();
         break;
    }
    case 20: {
        this.widgets = new ArrayList<NebulaWidget>();
        loadpage3();
         break;
    }
    default:
        this.widgets = new ArrayList<NebulaWidget>();
        loadpage1();
    }
    PageResult<NebulaWidget> a = new PageResult<>(widgets, 25);
    return a;
    //return PageListHelper.createPage(widgets, controller);
}



private void loadpage1() {
    
    Person tomSchindl = new Person("Tom", "Schindl");
    addWidget(
            "Grid",
            "An custom table/tree widget which provides Excel like features and a JFaceViewer integration ",
            tomSchindl);
    addWidget(
            "PShelf",
            "The PShelf widget is a composite widget that is similar to a tab folder. It contains items which can be selected to show their client areas.",
            tomSchindl);
    addWidget(
            "PGroup",
            "The PGroup widget is a expandable/collapsible composite widget with attractive styling and an extensible design.",
            tomSchindl);

    Person nicolasRicheton = new Person("Nicolas", "Richeton");
    addWidget(
            "Gallery",
            "This SWT widget displays images or items in a grid-like presentation. Gallery is very useful to display images in a photo viewer or files in an explorer-like view.",
            nicolasRicheton);

    Person eliasVolanakis = new Person("Elias", "Volanakis");
    addWidget(
            "CompositeTable",
            "An custom table/tree widget which provides Excel like features and a JFaceViewer integration ",
            eliasVolanakis);

    Person donaldDunne = new Person("Donald", "Dunne");
    addWidget(
            "XViewer",
            "The purpose of the XViewer is to give the application developer a more advanced and dynamic TreeViewer that has the filtering and sorting ",
            donaldDunne);
    addWidget(
            "CalendarCombo",
            "The Calendar Combo Widget is a combo box widget that opens a calendar when dropped down. ",
            donaldDunne);

    Person wimJongman = new Person("Wim", "Jongman");
    addWidget("Oscilloscope", "A widget showing an Oscilloscope",
            wimJongman);

    Person martyJones = new Person("Marty", "Jones");
    addWidget("TableCombo",
            "A DropDown-Widget which uses a Table to display the items ",
            martyJones);

    Person ahmedMahran = new Person("Ahmed", "Mahran ");
    addWidget("STW", "A component which allows to implement transitions ",
            ahmedMahran);
// 10 Page 1

}
private void loadpage2() {
    
    Person nicolasRicheton = new Person("Nicolas", "Richeton");
    Person emilCrumhorn = new Person("Emil", "Crumhorn");
    addWidget("Gantt", "A comprehensive implementation of a Gantt chart.",
            emilCrumhorn);

    Person jeremyDowdall = new Person("Jeremy", "Dowdall");
    addWidget("CDateTime", "A Date and Time selector widget.",
            jeremyDowdall);

    addWidget("CWT", "Nebula animation ", nicolasRicheton);
    
    Person tomSchindl = new Person("Tom", "Schindl");
    addWidget(
            "BidiLayout",
            "The PGroup widget is a expandable/collapsible composite widget with attractive styling and an extensible design.",
            tomSchindl);

    Person mattHall = new Person("Matt", "Hall");
    addWidget("PaperClips", "Printing Library", mattHall);
    addWidget("Radio Group", "Group of Radio Buttons", emilCrumhorn);

    addWidget(
            "Collapsible Buttons",
            "Widget modeled after the bottom left buttons widget in Microsoft Outlook ",
            emilCrumhorn);

    Person ericWuillai = new Person("Eric", "Wuillai");
    addWidget("Date Chooser",
            "Presents the monthly view of a calendar for date picking.",
            ericWuillai);
    addWidget(
            "Formatted Text",
            "A decorator component adding input and display mask capabilities on a Text widget.",
            ericWuillai);

    Person lukaszMilewski = new Person("Lukasz", "Milewski");
    addWidget("Nebula Toolbar",
            "A comprehensive implementation of a Gantt chart. ",
            lukaszMilewski);
//10 Page2


}

private void loadpage3() {
    Person jeremyDowdall = new Person("Jeremy", "Dowdall");
            Person mickaelIstria = new Person("Mickael", "Istria");
    addWidget("TreeMapper", "Mapping between Tree's", mickaelIstria);

    Person angeloZerr = new Person("Angelo", "Zerr");
    addWidget("Picture Control",
            "A control managing (download and display) a picture.",
            angeloZerr);
    addWidget(
            "Pagination Control",
            "A control managing paginated list and display pagination navigation bar.",
            angeloZerr);

    addWidget("CTree", "", jeremyDowdall);

    Person edwinPark = new Person("Edwin", "Park");
    addWidget(
            "NatTable",
            "NatTable is a powerful and flexible SWT table/grid widget that is built to handle very large data sets, real-time updates, dynamic styling, and more.",
            edwinPark);
// Page3 
}
private void addWidget(String name, String description, Person committer) {
    this.widgets.add(new NebulaWidget(name, description, committer));

}

}

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