App.java

package com.sample.client.local;

import javax.annotation.PostConstruct;
import javax.enterprise.event.Event;
import javax.enterprise.event.Observes;
import javax.inject.Inject;

import org.jboss.errai.ioc.client.api.EntryPoint;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;

import com.sample.client.shared.HelloMessage;
import com.sample.client.shared.Response;

/**
 * Main application entry point.
 */
@EntryPoint
public class App {

    @Inject
    private Event<HelloMessage> messageEvent;

    private final Label responseLabel = new Label();
    private final Button button = new Button("Send");
    private final TextBox message = new TextBox();

    @PostConstruct
    public void buildUI() {

        button.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {

                // In GWT Dev Mode, Text written to System.out shows up in the
                // console where you launched Dev Mode (eg. in your terminal
                // window or in the Eclipse Console tab).
                // In Production Mode, System.out is a black hole.
                System.out.println("Handling click event!");

                fireMessage();
            }
        });

        HorizontalPanel horizontalPanel = new HorizontalPanel();
        horizontalPanel.add(message);
        horizontalPanel.add(button);
        horizontalPanel.add(responseLabel);

        RootPanel.get().add(horizontalPanel);
        
        System.out.println("UI Constructed!");
    }

    /**
     * Fires a CDI HelloMessage with the current contents of the message textbox.
     */
    void fireMessage() {
      String text = message.getText();
      HelloMessage event = new HelloMessage(text);
      messageEvent.fire(event);
    }

    public void response(@Observes Response event) {
        System.out.println("Got a Response!");
        responseLabel.setText("HelloMessage from Server: " + event.getMessage().toUpperCase());
    }

    /**
     * Returns the "Send" button. Exposed for testing.
     */
    Button getSendButton() {
        return button;
    }
    
    /**
     * Returns the response label. Exposed for testing.
     */
    Label getResponseLabel() {
      return responseLabel;
    }
    
    /**
     * Returns the "message" text box. Exposed for testing.
     */
    TextBox getMessageBox() {
      return message;
    }
}