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Spring Boot Actuator AutoConfigure
/*
* Copyright 2012-2020 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 org.springframework.boot.actuate.autoconfigure.health;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.boot.actuate.health.CompositeHealthContributor;
import org.springframework.boot.actuate.health.CompositeReactiveHealthContributor;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthContributor;
import org.springframework.boot.actuate.health.HealthContributorRegistry;
import org.springframework.boot.actuate.health.HealthEndpoint;
import org.springframework.boot.actuate.health.HealthEndpointGroups;
import org.springframework.boot.actuate.health.HealthEndpointGroupsPostProcessor;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.boot.actuate.health.HttpCodeStatusMapper;
import org.springframework.boot.actuate.health.NamedContributor;
import org.springframework.boot.actuate.health.ReactiveHealthContributor;
import org.springframework.boot.actuate.health.ReactiveHealthIndicator;
import org.springframework.boot.actuate.health.SimpleHttpCodeStatusMapper;
import org.springframework.boot.actuate.health.SimpleStatusAggregator;
import org.springframework.boot.actuate.health.StatusAggregator;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.ClassUtils;
/**
* Configuration for {@link HealthEndpoint} infrastructure beans.
*
* @author Phillip Webb
* @see HealthEndpointAutoConfiguration
*/
@Configuration(proxyBeanMethods = false)
class HealthEndpointConfiguration {
@Bean
@ConditionalOnMissingBean
StatusAggregator healthStatusAggregator(HealthEndpointProperties properties) {
return new SimpleStatusAggregator(properties.getStatus().getOrder());
}
@Bean
@ConditionalOnMissingBean
HttpCodeStatusMapper healthHttpCodeStatusMapper(HealthEndpointProperties properties) {
return new SimpleHttpCodeStatusMapper(properties.getStatus().getHttpMapping());
}
@Bean
@ConditionalOnMissingBean
HealthEndpointGroups healthEndpointGroups(ApplicationContext applicationContext,
HealthEndpointProperties properties) {
return new AutoConfiguredHealthEndpointGroups(applicationContext, properties);
}
@Bean
@ConditionalOnMissingBean
HealthContributorRegistry healthContributorRegistry(ApplicationContext applicationContext,
HealthEndpointGroups groups) {
Map healthContributors = new LinkedHashMap<>(
applicationContext.getBeansOfType(HealthContributor.class));
if (ClassUtils.isPresent("reactor.core.publisher.Flux", applicationContext.getClassLoader())) {
healthContributors.putAll(new AdaptedReactiveHealthContributors(applicationContext).get());
}
return new AutoConfiguredHealthContributorRegistry(healthContributors, groups.getNames());
}
@Bean
@ConditionalOnMissingBean
HealthEndpoint healthEndpoint(HealthContributorRegistry registry, HealthEndpointGroups groups) {
return new HealthEndpoint(registry, groups);
}
@Bean
static HealthEndpointGroupsBeanPostProcessor healthEndpointGroupsBeanPostProcessor(
ObjectProvider healthEndpointGroupsPostProcessors) {
return new HealthEndpointGroupsBeanPostProcessor(healthEndpointGroupsPostProcessors);
}
/**
* {@link BeanPostProcessor} to invoke {@link HealthEndpointGroupsPostProcessor}
* beans.
*/
private static class HealthEndpointGroupsBeanPostProcessor implements BeanPostProcessor {
private final ObjectProvider postProcessors;
HealthEndpointGroupsBeanPostProcessor(ObjectProvider postProcessors) {
this.postProcessors = postProcessors;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof HealthEndpointGroups) {
return applyPostProcessors((HealthEndpointGroups) bean);
}
return bean;
}
private Object applyPostProcessors(HealthEndpointGroups bean) {
for (HealthEndpointGroupsPostProcessor postProcessor : this.postProcessors.orderedStream()
.toArray(HealthEndpointGroupsPostProcessor[]::new)) {
bean = postProcessor.postProcessHealthEndpointGroups(bean);
}
return bean;
}
}
/**
* Adapter to expose {@link ReactiveHealthContributor} beans as
* {@link HealthContributor} instances.
*/
private static class AdaptedReactiveHealthContributors {
private final Map adapted;
AdaptedReactiveHealthContributors(ApplicationContext applicationContext) {
Map adapted = new LinkedHashMap<>();
applicationContext.getBeansOfType(ReactiveHealthContributor.class)
.forEach((name, contributor) -> adapted.put(name, adapt(contributor)));
this.adapted = Collections.unmodifiableMap(adapted);
}
private HealthContributor adapt(ReactiveHealthContributor contributor) {
if (contributor instanceof ReactiveHealthIndicator) {
return adapt((ReactiveHealthIndicator) contributor);
}
if (contributor instanceof CompositeReactiveHealthContributor) {
return adapt((CompositeReactiveHealthContributor) contributor);
}
throw new IllegalStateException("Unsupported ReactiveHealthContributor type " + contributor.getClass());
}
private HealthIndicator adapt(ReactiveHealthIndicator indicator) {
return new HealthIndicator() {
@Override
public Health getHealth(boolean includeDetails) {
return indicator.getHealth(includeDetails).block();
}
@Override
public Health health() {
return indicator.health().block();
}
};
}
private CompositeHealthContributor adapt(CompositeReactiveHealthContributor composite) {
return new CompositeHealthContributor() {
@Override
public Iterator> iterator() {
Iterator> iterator = composite.iterator();
return new Iterator>() {
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public NamedContributor next() {
NamedContributor next = iterator.next();
return NamedContributor.of(next.getName(), adapt(next.getContributor()));
}
};
}
@Override
public HealthContributor getContributor(String name) {
return adapt(composite.getContributor(name));
}
};
}
Map get() {
return this.adapted;
}
}
}