Lifecycle of Composers?

answered 2012-04-09 15:32:59 +0800

benbai
2228 ● 6
http://www.zkoss.org

Hi,

I think you need a 'middle object' to be the bridge between JMS and ZK component,
for example,

in zul page:

<window id="backupDialog" ...>
    <progressMeter id="curr_pm" ... >
        ....
    <timer id="timer" delay="1000" repeats="true" ...>
        ...

in composer

int curr_value = 0;
   ...
public void onMessage(Message message) {
    ...
    curr_value = Integer.parseInt(msgs[0]);
    ...
}

public void onTimer$timer () {
    curr_pm.setValue(curr_value);
}

Regards,
Ben

answered 2012-04-01 07:56:05 +0800

tsinglongwu
30 ● 2

Hi Frank,
I was blocked by a component lifecycle issue.

I want to upgrade Progressmeter infomation in backup.zul with processed message from JMS server. The page's bind class is following:

-------------------------------------------------
@Controller("backupDialogCtrl")
@Scope("prototype")
public class BackupCtrl extends GenericForwardComposer implements MessageListener {

private Window backupDialog;
private Textbox tDbIp, tDataPath, tAppVersion, tDescription;
private Label resultLabel;
private Progressmeter curr_pm;

public void doAfterCompose(Component comp) throws Exception{
super.doAfterCompose(comp);
}

public void onClick$backup() {
try {
resultLabel.setValue("Starting..."); // All the components is available.

desktop.enableServerPush(true);

DBBkRestI dbBkRest = DBBkRestImpl.getInstance();
dbBkRest.backupDB(); Call JMS server method which will send message to consumers. The following method of onMessage() is the listener. It will accept and display all the messages.

} catch (Exception e) {
e.printStackTrace();
}
}

@Override
public void onMessage(Message message) { This method is extends javax.jms.MessageListener. It will be invoked whenever there are messages send from JMS server.

try {
if (message instanceof TextMessage) {
msgProcess = ((TextMessage)message).getText();
String[] msgs = msgProcess.split(",");

Executions.activate(desktop); // when jvm run at here, desktop is Null, include all of the components in the page.

curr_pm.setValue(Integer.parseInt(msgs[0]));
resultLabel.setValue(msgs[1]);

Executions.deactivate(desktop);

} else {
System.out.println("Message of wrong type: "
+ message.getClass().getName());
}
} catch (JMSException e) {
... ...
} catch (Throwable t) {
... ...
} finally {
... ...
}
}
}
-----------------------------------

When the onMessage() is invoked, all the components is Null(include the window of backupDialog). How can I use the components in the method of onMessage().

Thank you a lot!
Alex