The messages that are handled here are {@link EventMessage}, {@link PublishMessage}, {@link SubscribeMessage} and{@link UnsubscribeMessage}
The handler manages a map (topicSessionIds) that holds a set of WebSocket session ids per topicURI.
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return new WampMessageSender(configurer.outboundExecutor(), jsonFactory); } @Bean public PubSubHandler pubSubHandler() { return new PubSubHandler(wampMessageSender()); }