Атмосферный ресурс за сессию
Я не могу установить вещательную компанию Atmosphere для каждого сеанса пользователя для ресурса Atmosphere. Все, что я могу почерпнуть из документации, - это как создавать приложения для чата, которые передают одно и то же сообщение каждому пользователю.
Возможно ли, чтобы среда Atmosphere установила канал для сеанса пользователя или мне нужно что-то делать и обрабатывать эти соединения самостоятельно с помощью карты в памяти?
Это ресурс, который я хочу:
/websockets/notifications
Я хочу, чтобы пользователи A и B подключались к этому каналу из разных браузеров, а затем имели возможность независимо передавать их сообщения. Я должен иметь возможность использовать их идентификаторы сессий, чтобы атмосфера понимала, кому отправлять ответ.
Атмосфера поддерживает это?
Соответствующий POM.xml
<spring-boot-starter-web.version>1.3.3.RELEASE</spring-boot-starter-web.version>
<atmosphere-runtime.version>2.4.4</atmosphere-runtime.version>
<atmosphere-javascript.version>2.3.0</atmosphere-javascript.version>
Конфигурация атмосферы
package com.hello;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
import org.atmosphere.cache.UUIDBroadcasterCache;
import org.atmosphere.cpr.ApplicationConfig;
import org.atmosphere.cpr.AtmosphereFramework;
import org.atmosphere.cpr.AtmosphereServlet;
import org.atmosphere.cpr.MetaBroadcaster;
import org.springframework.boot.context.embedded.ServletContextInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class AtmosphereConfiguration implements ServletContextInitializer {
@Bean
public AtmosphereServlet atmosphereServlet() {
return new AtmosphereServlet();
}
@Bean
public AtmosphereFramework atmosphereFramework() {
return atmosphereServlet().framework();
}
@Bean
public MetaBroadcaster metaBroadcaster() {
AtmosphereFramework framework = atmosphereFramework();
return framework.metaBroadcaster();
}
@Override
public void onStartup(ServletContext servletContext) throws ServletException {
configureAthmosphere(atmosphereServlet(), servletContext);
}
private void configureAthmosphere(AtmosphereServlet servlet, ServletContext servletContext) {
ServletRegistration.Dynamic atmosphereServlet = servletContext.addServlet("atmosphereServlet", servlet);
atmosphereServlet.setInitParameter(ApplicationConfig.ANNOTATION_PACKAGE, "com.hello");
atmosphereServlet.setInitParameter(ApplicationConfig.BROADCASTER_CACHE, UUIDBroadcasterCache.class.getName());
atmosphereServlet.setInitParameter(ApplicationConfig.BROADCASTER_SHARABLE_THREAD_POOLS, "true");
atmosphereServlet.setInitParameter(ApplicationConfig.BROADCASTER_MESSAGE_PROCESSING_THREADPOOL_MAXSIZE, "10");
atmosphereServlet.setInitParameter(ApplicationConfig.BROADCASTER_ASYNC_WRITE_THREADPOOL_MAXSIZE, "10");
servletContext.addListener(new org.atmosphere.cpr.SessionSupport());
atmosphereServlet.addMapping("/websocket/*");
atmosphereServlet.setLoadOnStartup(0);
atmosphereServlet.setAsyncSupported(true);
}
}
Атмосферный ресурс
package com.hello;
import java.nio.charset.StandardCharsets;
import org.atmosphere.config.service.Get;
import org.atmosphere.config.service.Disconnect;
import org.atmosphere.config.service.ManagedService;
import org.atmosphere.config.service.Ready;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.cpr.AtmosphereResourceEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ManagedService(path = NotificationAtmosphereResource.PATH)
public class NotificationAtmosphereResource {
public static final String PATH = "/websocket/notifications";
private Logger logger = LoggerFactory.getLogger(NotificationAtmosphereResource.class);
@Get
public void init(AtmosphereResource resource){
resource.getResponse().setCharacterEncoding(StandardCharsets.UTF_8.name());
}
@Ready
public void onReady(final AtmosphereResource resource) {
logger.info("Connected {}", resource.uuid());
}
@Disconnect
public void onDisconnect(AtmosphereResourceEvent event) {
logger.info("Client {} disconnected [{}]", event.getResource().uuid(),
(event.isCancelled() ? "cancelled" : "closed"));
}
}
Служба, с которой я посылаю сообщения
package com.hello;
import org.atmosphere.cpr.MetaBroadcaster;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class NotificationEmitterBean implements NotificationEmitter {
private Logger logger = LoggerFactory.getLogger(NotificationEmitterBean.class);
@Autowired
private MetaBroadcaster metaBroadcaster;
@Autowired
private NotificationService notificationService;
@Autowired
private JsonMapper jsonMapper;
@Override
public void emitNotification(String sessionId, String msg) {
// This will broadcast to all users on /websocket/notifications
// How can I use sessionId to broadcast to the respective browser?
metaBroadcaster.broadcastTo(NotificationAtmosphereResource.PATH,
jsonMapper.toJson(msg));
}
}
}
1 ответ
Единственный способ, которым я смог добиться этой работы, - это создать свой собственный вещательный вещатель. Я использовал ExcludeSessionBroadcaster, написанный Жанфрансуа Аркандом, в качестве основы.
IncludeSessionBroadcaster.java
package com.hello;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.Future;
import org.atmosphere.cpr.AtmosphereConfig;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.cpr.Broadcaster;
import org.atmosphere.cpr.BroadcasterFuture;
import org.atmosphere.cpr.DefaultBroadcaster;
import org.atmosphere.cpr.Deliver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An implementation of {@link DefaultBroadcaster} that include one or more {@link AtmosphereResource}
*
* Based on ExcludeSessionBroadcaster written by Jeanfrancois Arcand
*
* @author Steven Zgaljic
*/
public class IncludeSessionBroadcaster extends DefaultBroadcaster {
private static final Logger logger = LoggerFactory.getLogger(IncludeSessionBroadcaster.class);
public IncludeSessionBroadcaster(){}
public Broadcaster initialize(String id, AtmosphereConfig config) {
return super.initialize(id, config);
}
/**
* the AtmosphereResource r will be include for this broadcast
*
* @param msg
* @param r
* @return
*/
@Override
public Future<Object> broadcast(Object msg, AtmosphereResource r) {
if (destroyed.get()) {
throw new IllegalStateException("This Broadcaster has been destroyed and cannot be used");
}
Set<AtmosphereResource> sub = new HashSet<AtmosphereResource>();
sub.removeAll(resources);
sub.add(r);
start();
Object newMsg = filter(msg);
if (newMsg == null) {
return null;
}
BroadcasterFuture<Object> f = new BroadcasterFuture<Object>(newMsg, sub.size());
dispatchMessages(new Deliver(newMsg, sub, f, msg));
return f;
}
/**
* the AtmosphereResources subset will be include for this broadcast
*
* @param msg
* @param subset
* @return
*/
@Override
public Future<Object> broadcast(Object msg, Set<AtmosphereResource> subset) {
if (destroyed.get()) {
return futureDone(msg);
}
subset.retainAll(resources);
start();
Object newMsg = filter(msg);
if (newMsg == null) {
return futureDone(msg);
}
BroadcasterFuture<Object> f = new BroadcasterFuture<Object>(newMsg, subset.size());
dispatchMessages(new Deliver(newMsg, subset, f, msg));
return f;
}
/**
* session will be include for this broadcast
*
* @param msg
* @param s
* @return
*/
public Future<Object> broadcast(Object msg, String sessionId) {
if (destroyed.get()) {
return futureDone(msg);
}
Set<AtmosphereResource> subset = new HashSet<AtmosphereResource>();
for (AtmosphereResource r : resources) {
if (!r.getAtmosphereResourceEvent().isCancelled() &&
sessionId.equals(r.getRequest().getSession().getId())) {
subset.add(r);
break;
}
}
start();
Object newMsg = filter(msg);
if (newMsg == null) {
return futureDone(msg);
}
BroadcasterFuture<Object> f = new BroadcasterFuture<Object>(newMsg, subset.size());
dispatchMessages(new Deliver(newMsg, subset, f, msg));
return f;
}
}
Затем я назначил этого вещателя на ресурс Атмосфера.
NotificationAtmosphereResource.java
package com.hello;
import java.nio.charset.StandardCharsets;
import org.atmosphere.config.service.Get;
import org.atmosphere.config.service.Disconnect;
import org.atmosphere.config.service.ManagedService;
import org.atmosphere.config.service.Ready;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.cpr.AtmosphereResourceEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ManagedService(path = NotificationAtmosphereResource.PATH,
broadcaster=IncludeSessionBroadcaster.class)
public class NotificationAtmosphereResource {
public static final String PATH = "/websocket/notifications";
private Logger logger = LoggerFactory.getLogger(NotificationAtmosphereResource.class);
@Get
public void init(AtmosphereResource resource){
resource.getResponse().setCharacterEncoding(StandardCharsets.UTF_8.name());
}
@Ready
public void onReady(final AtmosphereResource resource) {
logger.info("Connected {}", resource.uuid());
}
@Disconnect
public void onDisconnect(AtmosphereResourceEvent event) {
logger.info("Client {} disconnected [{}]", event.getResource().uuid(),
(event.isCancelled() ? "cancelled" : "closed"));
}
}
Тогда я мог бы отправить сообщение только браузеру (sessionId), который я хочу.
NotificationEmitterBean.java
package com.hello;
import org.atmosphere.cpr.MetaBroadcaster;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class NotificationEmitterBean implements NotificationEmitter {
private Logger logger = LoggerFactory.getLogger(NotificationEmitterBean.class);
@Autowired
private BroadcasterFactory factory;
@Override
public void emitNotification(String sessionId, String msg) {
((IncludeSessionBroadcaster)factory.lookup(NotificationAtmosphereResource.PATH)).broadcast(msg, sessionId);
}
}
}