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GEARS Runtime Server

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package com.xlrit.gears.server.tmp;

import com.xlrit.gears.base.event.ElementPublishedEvent;
import com.xlrit.gears.base.model.Message;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Service;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Sinks;

@Service
public class MessageEventService {
    private static final Logger LOG = LoggerFactory.getLogger(MessageEventService.class);

    private final Sinks.Many messagePublisher;

    public MessageEventService() {
        this.messagePublisher = Sinks.many().multicast().directBestEffort();
    }

    public Flux subscribe(String userId) {
        return messagePublisher.asFlux().filter(message -> message.forUser(userId));
    }

    @EventListener
    public void onPublish(ElementPublishedEvent publishedEvent) {
        Message message = publishedEvent.getElement();

        LOG.info("onPublish: message={}", message);
        messagePublisher.emitNext(message, Sinks.EmitFailureHandler.FAIL_FAST);
    }
}