service-monitor/src/main/java/com/yahoo/vespa/service/health/ApplicationHealthMonitor.java


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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.service.health;

import com.yahoo.config.model.api.ApplicationInfo;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.vespa.applicationmodel.ClusterId;
import com.yahoo.vespa.applicationmodel.ConfigId;
import com.yahoo.vespa.applicationmodel.ServiceStatus;
import com.yahoo.vespa.applicationmodel.ServiceType;
import com.yahoo.vespa.service.model.ServiceId;
import com.yahoo.vespa.service.monitor.ServiceStatusProvider;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * Responsible for monitoring a whole application using /state/v1/health.
 *
 * @author hakon
 */
class ApplicationHealthMonitor implements ServiceStatusProvider, AutoCloseable {
    private final ApplicationId applicationId;
    private final StateV1HealthModel healthModel;
    private final Map<ServiceId, HealthMonitor> monitors = new HashMap<>();

    ApplicationHealthMonitor(ApplicationId applicationId, StateV1HealthModel healthModel) {
        this.applicationId = applicationId;
        this.healthModel = healthModel;
    }

    void monitor(ApplicationInfo applicationInfo) {
        if (!applicationInfo.getApplicationId().equals(applicationId)) {
            throw new IllegalArgumentException("Monitors " + applicationId + " but was asked to monitor " + applicationInfo.getApplicationId());
        }

        Map<ServiceId, HealthEndpoint> endpoints = healthModel.extractHealthEndpoints(applicationInfo);

        // Remove obsolete monitors
        Set<ServiceId> removed = new HashSet<>(monitors.keySet());
        removed.removeAll(endpoints.keySet());
        removed.stream().map(monitors::remove).forEach(HealthMonitor::close);

        // Add new monitors.
        endpoints.forEach((serviceId, endpoint) -> monitors.computeIfAbsent(serviceId, ignoredId -> endpoint.startMonitoring()));
    }

    @Override
    public ServiceStatus getStatus(ApplicationId applicationId,
                                   ClusterId clusterId,
                                   ServiceType serviceType,
                                   ConfigId configId) {
        ServiceId serviceId = new ServiceId(applicationId, clusterId, serviceType, configId);
        HealthMonitor monitor = monitors.get(serviceId);
        if (monitor == null) {
            return ServiceStatus.NOT_CHECKED;
        }

        return monitor.getStatus();
    }

    @Override
    public void close() {
        monitors.values().forEach(HealthMonitor::close);
        monitors.clear();
    }
}