@Test public void findSubscriptions() throws Exception { DefaultSimpUserRegistry registry = new DefaultSimpUserRegistry(); TestPrincipal user = new TestPrincipal("joe"); Message<byte[]> message = createMessage(SimpMessageType.CONNECT_ACK, "123"); SessionConnectedEvent event = new SessionConnectedEvent(this, message, user); registry.onApplicationEvent(event); message = createMessage(SimpMessageType.SUBSCRIBE, "123", "sub1", "/match"); SessionSubscribeEvent subscribeEvent = new SessionSubscribeEvent(this, message, user); registry.onApplicationEvent(subscribeEvent); message = createMessage(SimpMessageType.SUBSCRIBE, "123", "sub2", "/match"); subscribeEvent = new SessionSubscribeEvent(this, message, user); registry.onApplicationEvent(subscribeEvent); message = createMessage(SimpMessageType.SUBSCRIBE, "123", "sub3", "/not-a-match"); subscribeEvent = new SessionSubscribeEvent(this, message, user); registry.onApplicationEvent(subscribeEvent); Set<SimpSubscription> matches = registry.findSubscriptions(new SimpSubscriptionMatcher() { @Override public boolean match(SimpSubscription subscription) { return subscription.getDestination().equals("/match"); } }); assertEquals(2, matches.size()); Iterator<SimpSubscription> iterator = matches.iterator(); Set<String> sessionIds = new HashSet<>(2); sessionIds.add(iterator.next().getId()); sessionIds.add(iterator.next().getId()); assertEquals(new HashSet<>(Arrays.asList("sub1", "sub2")), sessionIds); }