CalculatorClient.java

/*
 * Copyright 2009 JBoss, a divison Red Hat, Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jboss.errai.cdi.client.service;

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.HTML;
import com.google.gwt.user.client.ui.TextBox;
import org.gwt.mosaic.ui.client.MessageBox;
import org.gwt.mosaic.ui.client.layout.BoxLayout;
import org.gwt.mosaic.ui.client.layout.LayoutPanel;
import org.jboss.errai.bus.client.ErraiBus;
import org.jboss.errai.bus.client.api.Message;
import org.jboss.errai.bus.client.api.MessageCallback;
import org.jboss.errai.bus.client.api.base.MessageBuilder;
import org.jboss.errai.bus.client.framework.MessageBus;
import org.jboss.errai.bus.client.protocols.MessageParts;
import org.jboss.errai.bus.server.annotations.Service;
import org.jboss.errai.tools.source.client.ViewSource;
import org.jboss.errai.workspaces.client.api.ProvisioningCallback;
import org.jboss.errai.workspaces.client.api.WidgetProvider;
import org.jboss.errai.workspaces.client.api.annotations.LoadTool;

import javax.inject.Inject;

/**
 * @author: Heiko Braun <hbraun@redhat.com>
 * @date: Apr 6, 2010
 */
@LoadTool(name="Beans as Services", group = "Examples")
public class CalculatorClient implements WidgetProvider
{
  private final MessageBus bus;

  private HTML responsePanel;

  @Service("calculationResult")
  public MessageCallback responseListener = new MessageCallback()
  {
    public void callback(Message message)
    {
      responsePanel.setText("Calculation result: "+message.get(Double.class, "result")+"");
    }
  };

  @Inject
  public CalculatorClient(MessageBus bus)
  {
    this.bus = bus;
  }

  public void provideWidget(ProvisioningCallback callback)
  {    
    LayoutPanel panel = new LayoutPanel(new BoxLayout(BoxLayout.Orientation.VERTICAL));

    // demo, view source
    ViewSource.on(panel,
        new String[] {"org/jboss/errai/cdi/client/service/CalculatorClient.java",
            "org/jboss/errai/cdi/server/service/CalculatorService.java"}
    );

    final TextBox a = new TextBox();
    final TextBox b = new TextBox();

    LayoutPanel inputPanel = new LayoutPanel(new BoxLayout(BoxLayout.Orientation.HORIZONTAL));
    inputPanel.add(a);
    inputPanel.add(b);

    Button button = new Button("Send to service", new ClickHandler()
    {
      public void onClick(ClickEvent clickEvent)
      {
        if(validate(a,b))
        {
          MessageBuilder.createMessage()
              .toSubject("calculator")
              .signalling()
              .with(MessageParts.ReplyTo, "calculationResult")
              .with("a", Double.valueOf(a.getText()))
              .with("b", Double.valueOf(b.getText()))
              .noErrorHandling()
              .sendNowWith(bus);
        }
      }
    });

    responsePanel = new HTML();

    panel.add(new HTML("This example shows how to use managed beans as services."));
    panel.add(new HTML("(Add to numbers)"));
    panel.add(inputPanel);
    panel.add(button);
    panel.add(responsePanel);

    callback.onSuccess(panel);
  }

  private boolean validate(TextBox... input)
  {
    boolean valid = true;
    for(TextBox t : input)
    {
      if(t.getText()==null || t.getText().equals(""))
      {
        valid = false;
        MessageBox.error("Input Validation", "Please enter valid numbers");
      }
    }

    return valid;
  }

}