Refreshing a view from another class
Hi all,
I am doing my first RCP application development using Lotus Expeditor.
Anyway, so far, here is what I have:
- A View (ViewPart) that displays a list of buttons depending on the content of a table in a database
- A class that is aware of the network status: when it detects that the application is online again, it will replicate the database (from a remote server, I am using DB2 Everyplace here)... that's working fine, but I would like also to refresh my View with the new data after replicating (without clicking on a "refresh" button on the view... I have tried this, and it's working fine, but I would like to have an automatic refresh).
So here are my questions:
- First, a design question: how should I do if I want a class to have access to my View? Indeed, my NetworkAwareImpl class needs to have access to it, but I can not pass the View object to the constructor the NetworkAwareImpl, since I create this object before creating the view (in the bundle activator class, so that the application is listening from the very start to the network status). So, what I did, is implement my View as a kind of singleton, so that my NetworkAwareImpl can call DesktopView.getDefault().updateView() for instance...
- Please take a look to my DesktopView class... for some reason, when I call the updateView method from my NetworkAwareImpl class, the method stops on the container.dispose() call... without any errors but it stops!
My DesktopView:
Code:
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|
public class DesktopView extends ViewPart implements SelectionListener{
private MessageGeneratorSupport msgGenService;
private DatabaseSupport dsService;
private DatabaseSyncSupport dssService;
private PreferencesService prefService;
private static DesktopView view;
private UI ui;
private Composite parent;
private Composite container;
private boolean disposed = false;
public DesktopView()
{
view = this;
BundleContext context = Activator.getDefault().getContext();
ServiceReference refMsgGen = context.getServiceReference(MessageGeneratorSupport.class.getName());
msgGenService = (MessageGeneratorSupport) context.getService(refMsgGen);
ServiceReference refDS = context.getServiceReference(DatabaseSupport.class.getName());
dsService = (DatabaseSupport) context.getService(refDS);
ServiceReference refDSS = context.getServiceReference(DatabaseSyncSupport.class.getName());
dssService = (DatabaseSyncSupport) context.getService(refDSS);
ServiceReference refPref = context.getServiceReference(PreferencesService.class.getName());
prefService = (PreferencesService) context.getService(refPref);
}
public void createPartControl(Composite parent) {
this.parent = parent;
parent.setLayout(new FillLayout());
Vector activities = new Vector();
try
{
activities = dsService.getActivitiesList();
}
catch(Exception e)
{
System.err.println(e.toString());
}
createContainer(parent, activities);
}
public void createContainer(Composite parent, Vector activities)
{
System.out.println("createContainer");
if(parent.isDisposed())
{
System.out.println("HERE");
return;
}
container = new Composite(parent, SWT.NONE);
container.setBounds(parent.getBounds());
GridLayout gl = new GridLayout();
gl.numColumns = 1;
container.setLayout(gl);
for(int i=0; i<activities.size(); i++)
{
System.out.println(i);
Button btn = new Button(container, SWT.NONE);
btn.setText((String)activities.elementAt(i));
}
Button btn = new Button(container, SWT.NONE);
btn.setText("refresh");
btn.setData("button");
btn.addSelectionListener(this);
container.layout();
}
public void setFocus() {
// TODO Auto-generated method stub
}
public void widgetDefaultSelected(SelectionEvent arg0) {
// TODO Auto-generated method stub
}
public void updateView()
{
System.out.println("UpdateView");
if(!isDisposed()) {
if(!container.isDisposed())
{
System.out.println("about to dispose");
container.dispose();
disposed = true;
System.out.println("Disposed");
}
}
Vector activities = new Vector();
System.out.println("new Vector");
try
{
activities = dsService.getActivitiesList();
}
catch(Exception e)
{
System.err.println(e.toString());
}
createContainer(parent, activities);
disposed = false;
}
public void widgetSelected(SelectionEvent e) {
if(((String) e.widget.getData()).equals("button")) {
if(!isDisposed()) {
updateView();
}
}
}
public boolean isDisposed()
{
return disposed;
}
public void dispose() {
disposed = true;
super.dispose();
}
public static DesktopView getDefault()
{
return view;
}
} |
Note: for now, I added a refresh button, and this is working fine.
And my NetworkAwareImpl :
Code:
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public class NetworkAwareImpl implements INetworkAware {
IOfflineServiceHelper _helper;
private DatabaseSyncSupport dssService;
private DatabaseSupport dsService;
private PreferencesService prefService;
public NetworkAwareImpl()
{
BundleContext context = Activator.getDefault().getContext();
ServiceReference refDS = context.getServiceReference(DatabaseSupport.class.getName());
dsService = (DatabaseSupport) context.getService(refDS);
ServiceReference refDSS = context.getServiceReference(DatabaseSyncSupport.class.getName());
dssService = (DatabaseSyncSupport) context.getService(refDSS);
ServiceReference refPref = context.getServiceReference(PreferencesService.class.getName());
prefService = (PreferencesService) context.getService(refPref);
}
public INetworkAware init() {
_helper = IOfflineServiceHelperFactory.INSTANCE.create(this);
return this;
}
public IOfflineServiceHelper getOfflineServiceHelper() {
return _helper;
}
public void disconnected(){
System.out.println("DISCONNECTED");
//do things accordingly if the system state changed to offline. e.g if the network connectivity is lost.
//e.g if application calls IOfflineManager.disconnected(), IOfflineManager will
// fire an DISCONNECTED event, which directly call INetworkAware.disconnected() method here.
// no intermediate states.
}
public void reconnected(){
System.out.println("RECONNECTED");
//do things accordingly if the system state changed to online.e.g. if the network connectivity is back.
//e.g if application calls IOfflineManager.reconnected(), IOfflineManager will
// fire an RECONNECTED event, which directly call INetworkAware.reconnected() method here.
// no intermediate states.
dssService.synchronizeDatabase(prefService.getUsername(), prefService.getPassword(), prefService.getHost());
System.out.println("replicated");
DesktopView.getDefault().updateView();
}
... |
Last question: is it ok to invoke other plugins in the DesktopView, as I did it? Since it's a view, it doesn't look nice to me... can you advice me also on this?
Thanks a LOT ! :)
