/*
 * Copyright 2014-2017 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
 *
 *     http://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.services;

import de.codecentric.boot.admin.server.domain.events.InstanceEvent;
import de.codecentric.boot.admin.server.domain.events.InstanceStatusChangedEvent;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.core.scheduler.Schedulers;

import org.reactivestreams.Publisher;

public class EndpointDetectionTrigger extends ResubscribingEventHandler<InstanceStatusChangedEvent> {
    private final EndpointDetector endpointDetector;

    public EndpointDetectionTrigger(EndpointDetector endpointDetector, Publisher<InstanceEvent> publisher) {
        super(publisher, InstanceStatusChangedEvent.class);
        this.endpointDetector = endpointDetector;
    }

    @Override
    protected Publisher<?> handle(Flux<InstanceStatusChangedEvent> publisher) {
        return publisher.subscribeOn(Schedulers.newSingle("endpoint-detector")).flatMap(this::detectEndpoints);
    }

    protected Mono<Void> detectEndpoints(InstanceStatusChangedEvent event) {
        return endpointDetector.detectEndpoints(event.getInstance());
    }
}
