/*
* Copyright 2012-2016 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 org.springframework.boot.actuate.autoconfigure;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.health.CompositeHealthIndicator;
import org.springframework.boot.actuate.health.HealthAggregator;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.core.ResolvableType;
/**
* Base class for configurations that can combine source beans using a
* {@link CompositeHealthIndicator}.
*
* @param <H> the health indicator type
* @param <S> the bean source type
* @author Stephane Nicoll
* @since 1.4.0
*/
public abstract class CompositeHealthIndicatorConfiguration<H extends HealthIndicator, S> {
@Autowired
private HealthAggregator healthAggregator;
protected HealthIndicator createHealthIndicator(Map<String, S> beans) {
if (beans.size() == 1) {
return createHealthIndicator(beans.values().iterator().next());
}
CompositeHealthIndicator composite = new CompositeHealthIndicator(
this.healthAggregator);
for (Map.Entry<String, S> entry : beans.entrySet()) {
composite.addHealthIndicator(entry.getKey(),
createHealthIndicator(entry.getValue()));
}
return composite;
}
@SuppressWarnings("unchecked")
protected H createHealthIndicator(S source) {
Class<?>[] generics = ResolvableType
.forClass(CompositeHealthIndicatorConfiguration.class, getClass())
.resolveGenerics();
Class<H> indicatorClass = (Class<H>) generics[0];
Class<S> sourceClass = (Class<S>) generics[1];
try {
return indicatorClass.getConstructor(sourceClass).newInstance(source);
}
catch (Exception ex) {
throw new IllegalStateException("Unable to create indicator " + indicatorClass
+ " for source " + sourceClass, ex);
}
}
}