com.mercateo.eventstore.reader.EventSubscriptionHealthIndicator Maven / Gradle / Ivy

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/**
 * Copyright © 2018 Mercateo AG (http://www.mercateo.com)
 *
 * 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 com.mercateo.eventstore.reader;

import static com.mercateo.eventstore.reader.EventStreamState.State.LIVE;
import static com.mercateo.eventstore.reader.EventStreamState.State.REPLAYING;

import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;

import org.springframework.boot.actuate.health.AbstractHealthIndicator;
import org.springframework.boot.actuate.health.Health;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;

@Component("eventSubscriptionHealthIndicator")
@Slf4j
public class EventSubscriptionHealthIndicator extends AbstractHealthIndicator {

    private final Set activeMetrics;

    public EventSubscriptionHealthIndicator() {
        this.activeMetrics = new HashSet<>();
    }

    @Override
    protected void doHealthCheck(Health.Builder builder) throws Exception {
        if (isHealthy()) {
            builder.up();
        } else {
            log.warn("eventstore subscription not healthy on {}", unhealthySubscriptions());
            builder.down();
        }
    }

    public boolean isHealthy() {
        return activeMetrics.stream().allMatch(metrics -> (metrics.getStreamState().getState() == LIVE));
    }

    /**
     * @deprecated please use {{@link #isHealthy()}} instead
     * @return
     */
    @Deprecated
    public boolean isHealty() {
        return isHealthy();
    }

    private String unhealthySubscriptions() {
        return activeMetrics
            .stream()
            .filter(metrics -> metrics.getStreamState().getState() == REPLAYING)
            .map(EventStatisticsCollector::getEventStreamId)
            .map(Object::toString)
            .collect(Collectors.joining(", "));
    }

    public void addToMonitoring(EventStatisticsCollector eventStatisticsCollector) {
        activeMetrics.add(eventStatisticsCollector);
    }
}