Spring MVC with Atmosphere - spring

Question

I have recently started with Atmosphere. I need it to implement it in a Spring MVC application.
Till now I've managed to integrate it with Spring MVC.
I just need to perform a very simple task. I have a counter an instance variable as soon as it reaches 10, a response should be broadcasted to the UI.
Can anyone help me how do I write the code for that in the controller.
I've got the Atmosphere resource into the controller.
AtmosphereArgumentResolver.java
public class AtmosphereArgumentResolver implements HandlerMethodArgumentResolver {
//#Override
public boolean supportsParameter(MethodParameter parameter) {
return AtmosphereResource.class.isAssignableFrom(parameter.getParameterType());
}
//#Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception
{
HttpServletRequest httpServletRequest= webRequest.getNativeRequest(HttpServletRequest.class);
return Meteor.build(httpServletRequest).getAtmosphereResource();
}
}
HomeController.java
#Controller
public class HomeController {
private int counter = 0;
private final BroadcasterFactory bf;
public BroadcasterFactory broadcasterFactory()
{
return BroadcasterFactory.getDefault();
}
for(int i=0; i<=15; i++)
{
counter ++;
}
// As soon as the counter reaches 10 I need to send a broadcast message to the UI.
}
Can anyone please help? A skeleton code would also help as in which Atmosphere method to use for this?

Answer 1

I will copy/past the code i use in my application :
Controller :
#ManagedService(path = "/websocket/*")
#Singleton
public class LanesWebSocket {
private final Logger logger = LoggerFactory.getLogger(LanesWebSocket.class);
// private ScheduledExecutorService scheduledExecutorService;
private Future<?> scheduleFixedBroadcast;
private final ObjectMapper mapper = new ObjectMapper();
private SupervisionCenterService supervisionCenterService;
#Ready
public void onReady(final AtmosphereResource resource) {
if (this.supervisionCenterService == null)
supervisionCenterService = SpringApplicationContext.getBean(SupervisionCenterService.class);
Broadcaster bc = BroadcasterFactory.getDefault().lookup("lanes",true);
bc.addAtmosphereResource(resource);
scheduleFixedBroadcast = bc.scheduleFixedBroadcast(new Callable<String>() {
#Override
public String call() throws Exception {
try {
return mapper.writeValueAsString(supervisionCenterService.findCenterData());
} catch (Exception e) {
scheduleFixedBroadcast.cancel(true);
e.printStackTrace();
return null;
}
}
}, 1, TimeUnit.SECONDS);
}
And you also need to register the atmosphere servlet :
public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
[...]
#Override
protected void registerDispatcherServlet(ServletContext servletContext) {
super.registerDispatcherServlet(servletContext);
initAtmosphereServlet(servletContext);
}
private void initAtmosphereServlet(ServletContext servletContext) {
AtmosphereServlet servlet = new AtmosphereServlet();
Field frameworkField = ReflectionUtils.findField(AtmosphereServlet.class, "framework");
ReflectionUtils.makeAccessible(frameworkField);
ReflectionUtils.setField(frameworkField, servlet, new NoAnalyticsAtmosphereFramework());
ServletRegistration.Dynamic atmosphereServlet =
servletContext.addServlet("atmosphereServlet", servlet);
atmosphereServlet.setInitParameter("org.atmosphere.cpr.packages", "com.myclient.theproduct.supervision.websocket");
atmosphereServlet.setInitParameter("org.atmosphere.cpr.broadcasterCacheClass", UUIDBroadcasterCache.class.getName());
atmosphereServlet.setInitParameter("org.atmosphere.cpr.broadcaster.shareableThreadPool", "true");
atmosphereServlet.setInitParameter("org.atmosphere.cpr.broadcaster.maxProcessingThreads", "10");
atmosphereServlet.setInitParameter("org.atmosphere.cpr.broadcaster.maxAsyncWriteThreads", "10");
servletContext.addListener(new org.atmosphere.cpr.SessionSupport());
atmosphereServlet.addMapping("/websocket/*");
atmosphereServlet.setLoadOnStartup(3);
atmosphereServlet.setAsyncSupported(true);
}
public class NoAnalyticsAtmosphereFramework extends AtmosphereFramework {
public NoAnalyticsAtmosphereFramework() {
super();
}
#Override
protected void analytics() {
// nothing
}
}
}
Don't ask me the reason of the NoAnalyticsAtmosphereFramework class, it could not work without.
Hope this will help you !