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/*
 * Copyright 2014-2023 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.codecentric.boot.admin.server.eventstore;

import java.util.List;

import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Sinks;

import de.codecentric.boot.admin.server.domain.events.InstanceEvent;

public class InstanceEventPublisher implements Publisher {

	private static final Logger log = LoggerFactory.getLogger(InstanceEventPublisher.class);

	private final Flux publishedFlux;

	private final Sinks.Many unicast;

	private final Sinks.EmitFailureHandler emitFailureHandler = (signalType, emitResult) -> emitResult
		.equals(Sinks.EmitResult.FAIL_NON_SERIALIZED);

	protected InstanceEventPublisher() {
		this.unicast = Sinks.many().unicast().onBackpressureBuffer();
		this.publishedFlux = this.unicast.asFlux().publish().autoConnect(0);
	}

	protected void publish(List events) {
		events.forEach((event) -> {
			log.debug("Event published {}", event);
			this.unicast.emitNext(event, emitFailureHandler);
		});
	}

	@Override
	public void subscribe(Subscriber s) {
		this.publishedFlux.subscribe(s);
	}

}