Hello.
I have trouble with clean uping resources on client side. It starts with
digitalclock
. But I offer easier example:
For example we have timer (com.google.gwt.user.client.Timer) on client side connector, which invoke server method through serverRpc:
public class MyComponent extends com.vaadin.ui.AbstractComponent {
private MyComponentServerRpc rpc = new MyComponentServerRpc() {
@Override
public void doSmth() {
System.out.println("This is Sparta!");
}
};
public MyComponent() {
registerRpc(rpc);
}
@Override
public MyComponentState getState() {
return (MyComponentState) super.getState();
}
public void stopThis(){
getRpcProxy(MyComponentClientRpc.class).stopThis();
}
}
public interface MyComponentClientRpc extends ClientRpc {
public void stopThis();
}
@Connect(MyComponent.class)
public class MyComponentConnector extends AbstractComponentConnector {
MyComponentServerRpc rpc = RpcProxy
.create(MyComponentServerRpc.class, this);
private Timer timer;
private int i = 0;
public MyComponentConnector() {
registerRpc(MyComponentClientRpc.class, new MyComponentClientRpc() {
@Override
public void stopThis() {
if (timer != null) {
timer.cancel();
timer = null;
Window.alert("timer is stopped");
} else {
Window.alert("Hey! timer is already NULL");
}
}
});
timer = new Timer() {
@Override
public void run() {
rpc.doSmth();
i++;
getWidget().setText("Hello " + i + " times!");
}
};
timer.scheduleRepeating(5000);
}
@Override
protected Widget createWidget() {
return GWT.create(MyComponentWidget.class);
}
@Override
public MyComponentWidget getWidget() {
return (MyComponentWidget) super.getWidget();
}
@Override
public MyComponentState getState() {
return (MyComponentState) super.getState();
}
@Override
public void onStateChanged(StateChangeEvent stateChangeEvent) {
super.onStateChanged(stateChangeEvent);
}
}Widget is just Label for setting text.
Ok. I try to use this in my test UI class, which contents panel for mycomponent and two buttons: 1) stop clock and change content of the panel for new mycomponent. 2) just stop clock:
public class TestprojectdocUI extends UI {
private VerticalLayout mainLayout;
private MyComponent myComp;
@Override
protected void init(VaadinRequest request) {
mainLayout = new VerticalLayout();
setContent(mainLayout);
final Panel panel = new Panel();
myComp = new MyComponent();
panel.setContent(myComp);
mainLayout.addComponent(panel);
Button again = new Button("again");
again.addClickListener(new ClickListener() {
@Override
public void buttonClick(ClickEvent event) {
myComp.stopThis();
myComp = new MyComponent();
panel.setContent(myComp);
}
});
mainLayout.addComponent(again);
Button stop = new Button("just stop!");
stop.addClickListener(new ClickListener() {
@Override
public void buttonClick(ClickEvent event) {
myComp.stopThis();
}
});
mainLayout.addComponent(stop);Ok. If i click Button for only stopping clock i don’t have problem.
But if i click Button for stopping clock and set new content. Clock continue stay on client side and send requests to server-side and we have:
WARNING: RPC call to ***.MyComponentServerRpc.doSmth received for connector 14 but no such connector could be found. Resynchronizing client.I tried to stop this throught the State, but it also doesn’t work.
I don’t know why and what I can do with resource on client side. Please help.
Thank you.