public void onModuleLoad() {
final HorizontalPanel hPanel = new HorizontalPanel();
final Label messagesReceived = new Label("Messaged Received: ");
final Label messagesReceivedVal = new Label();
class Counter {
int count = 0;
public void increment() {
messagesReceivedVal.setText(String.valueOf(++count));
}
}
final Counter counter = new Counter();
for (int i = 0; i < 7; i++) {
final VerticalPanel panel = new VerticalPanel();
final Button startStopButton = new Button("Start" + i);
final TextBox resultBox = new TextBox();
resultBox.setEnabled(false);
final String receiverName = "RandomNumberReceiver" + i;
final Style resultStyle = resultBox.getElement().getStyle();
/** Create a callback receiver to receive the data from the server. */
final MessageCallback receiver =
new MessageCallback() {
public void callback(Message message) {
counter.increment();
Double value = message.get(Double.class, "Data");
resultBox.setText(String.valueOf(value));
if (value > 0.5d) {
resultStyle.setProperty("backgroundColor", "green");
} else {
resultStyle.setProperty("backgroundColor", "red");
}
}
};
/** Subscribe to the receiver using the recevierName. */
ErraiBus.get().subscribe(receiverName, receiver);
final int num = i;
startStopButton.addClickHandler(
new ClickHandler() {
public void onClick(ClickEvent clickEvent) {
/** Send a message to Start/Stop the task on the server. */
MessageBuilder.createMessage()
.toSubject("AsyncService")
.command(startStopButton.getText())
.with(MessageParts.ReplyTo, receiverName)
.noErrorHandling()
.sendNowWith(ErraiBus.get());
/**
* Flip-flop the value of the button every time it's pushed between 'Start' and 'Stop'
*/
startStopButton.setText(
("Start" + num).equals(startStopButton.getText()) ? "Stop" + num : "Start" + num);
}
});
panel.add(startStopButton);
panel.add(resultBox);
hPanel.add(panel);
}
final VerticalPanel outerPanel = new VerticalPanel();
outerPanel.add(hPanel);
final HorizontalPanel messageCounter = new HorizontalPanel();
messageCounter.add(messagesReceived);
messageCounter.add(messagesReceivedVal);
outerPanel.add(messageCounter);
RootPanel.get().add(outerPanel);
}
