/*
* Copyright 2014 The original authors
*
* 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.vaadin.spring.boot.sample.events;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.Button;
import com.vaadin.ui.Label;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEvent;
import org.vaadin.spring.VaadinUI;
import org.vaadin.spring.events.EventBus;
import org.vaadin.spring.events.EventBusListener;
import org.vaadin.spring.events.EventScope;
import javax.annotation.PreDestroy;
/**
* Demo of the scoped event buses.
*
* @author Petter Holmström (petter@vaadin.com)
*/
@VaadinUI(path = "/events")
public class EventsUI extends UI implements EventBusListener<Object> {
@Autowired
EventBus eventBus;
@Autowired
ApplicationContext applicationContext;
private VerticalLayout layout;
@Override
protected void init(VaadinRequest request) {
setPollInterval(300);
eventBus.subscribe(this);
layout = new VerticalLayout(
new Button("Publish UI Event", new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
eventBus.publish(EventsUI.this, "Hello World from UI");
}
}),
new Button("Publish Session Event", new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
eventBus.publish(EventScope.SESSION, EventsUI.this, "Hello World from Session");
}
}),
new Button("Publish Application Event", new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
eventBus.publish(EventScope.APPLICATION, EventsUI.this, "Hello World from Application");
}
}),
new Button("Publish Application Context Event", new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
applicationContext.publishEvent(new ApplicationEvent("Hello World from ApplicationContext") {
@Override
public Object getSource() {
return EventsUI.this;
}
});
}
})
);
layout.setSpacing(true);
setContent(layout);
}
@Override
public void onEvent(org.vaadin.spring.events.Event<Object> event) {
layout.addComponent(new Label(event.toString()));
}
@PreDestroy
void destroy() {
eventBus.unsubscribe(this); // It's good manners to do this, even though we should be automatically unsubscribed when the UI is garbage collected
}
}