protected Broadcaster getBroadcaster(boolean autoCreate) {
if (broadcaster == null) {
throw new IllegalStateException("No Broadcaster associated with this AtmosphereResource.");
}
String s = config.getInitParameter(ApplicationConfig.RECOVER_DEAD_BROADCASTER);
if (s != null) {
autoCreate = Boolean.parseBoolean(s);
}
if (autoCreate && broadcaster.isDestroyed() && config.getBroadcasterFactory() != null) {
logger.debug(
"Broadcaster {} has been destroyed and cannot be re-used. Recreating a new one with the same name. You can turn off this"
+ " mechanism by adding, in web.xml, {} set to false",
broadcaster.getID(),
ApplicationConfig.RECOVER_DEAD_BROADCASTER);
Broadcaster.SCOPE scope = broadcaster.getScope();
synchronized (this) {
String id =
scope != Broadcaster.SCOPE.REQUEST
? broadcaster.getID()
: broadcaster.getID() + ".recovered" + UUID.randomUUID();
// Another Thread may have added the Broadcaster.
broadcaster = config.getBroadcasterFactory().lookup(id, true);
broadcaster.setScope(scope);
broadcaster.addAtmosphereResource(this);
}
}
return broadcaster;
}
/**
* Create a {@link Meteor} using the {@link HttpServletRequest} and use a list of {@link
* BroadcastFilter} and {@link Serializer} for writing the result of a broadcast operation the
* {@link HttpServletResponse}.
*
* @param req an {@link HttpServletRequest}
* @param scope the {@link Broadcaster.SCOPE}}
* @param l a list of {@link BroadcastFilter}
* @param s a {@link Serializer} used when writing broadcast events
* @return a {@link Meteor} than can be used to resume, suspend and broadcast {@link Object}
*/
public static final Meteor build(
HttpServletRequest req, Broadcaster.SCOPE scope, List<BroadcastFilter> l, Serializer s) {
AtmosphereResource r = (AtmosphereResource) req.getAttribute(ATMOSPHERE_RESOURCE);
if (r == null) throw new IllegalStateException("MeteorServlet not defined in web.xml");
Broadcaster b = null;
if (scope == Broadcaster.SCOPE.REQUEST) {
try {
BroadcasterFactory f = r.getAtmosphereConfig().getBroadcasterFactory();
b =
f.get(
DefaultBroadcaster.class,
DefaultBroadcaster.class.getSimpleName()
+ r.getAtmosphereConfig().uuidProvider().generateUuid());
} catch (Throwable t) {
throw new RuntimeException(t);
}
b.setScope(scope);
r.setBroadcaster(b);
req.setAttribute(AtmosphereResourceImpl.SKIP_BROADCASTER_CREATION, Boolean.TRUE);
}
Meteor m = new Meteor(r, l, (s != null ? s : r.getSerializer()));
req.setAttribute(METEOR, m);
return m;
}
