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// Copyright Vespa.ai. 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.ServiceStatusInfo;
import com.yahoo.vespa.applicationmodel.ServiceType;
import com.yahoo.vespa.service.monitor.ServiceId;
import com.yahoo.vespa.service.monitor.ServiceStatusProvider;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
/**
* 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;
// Guards against concurrent access to monitors field w/objects in 1. monitor() (called from e.g. DuperModel),
// 2. getStatus() called from caching layer and Orchestrator above, and 3. REST calls to getAllServiceStatuses().
private final Object guard = new Object();
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);
synchronized (guard) {
// 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 ServiceStatusInfo getStatus(ApplicationId applicationId,
ClusterId clusterId,
ServiceType serviceType,
ConfigId configId) {
ServiceId serviceId = new ServiceId(applicationId, clusterId, serviceType, configId);
synchronized (guard) {
HealthMonitor monitor = monitors.get(serviceId);
if (monitor == null) {
return new ServiceStatusInfo(ServiceStatus.NOT_CHECKED);
}
return monitor.getStatus();
}
}
public Map<ServiceId, ServiceStatusInfo> getAllServiceStatuses() {
synchronized (guard) {
return monitors.entrySet().stream().collect(Collectors.toMap(
entry -> entry.getKey(),
entry -> entry.getValue().getStatus()));
}
}
@Override
public void close() {
synchronized (guard) {
monitors.values().forEach(HealthMonitor::close);
monitors.clear();
}
}
}
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