/*
* 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.endpoint;
import java.util.Map;
import org.springframework.boot.actuate.health.CompositeHealthIndicator;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthAggregator;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.util.Assert;
/**
* {@link Endpoint} to expose application health.
*
* @author Dave Syer
* @author Christian Dupuis
* @author Andy Wilkinson
*/
@ConfigurationProperties(prefix = "endpoints.health")
public class HealthEndpoint extends AbstractEndpoint<Health> {
private final HealthIndicator healthIndicator;
/**
* Time to live for cached result, in milliseconds.
*/
private long timeToLive = 1000;
/**
* Create a new {@link HealthEndpoint} instance.
* @param healthAggregator the health aggregator
* @param healthIndicators the health indicators
*/
public HealthEndpoint(HealthAggregator healthAggregator,
Map<String, HealthIndicator> healthIndicators) {
super("health", false);
Assert.notNull(healthAggregator, "HealthAggregator must not be null");
Assert.notNull(healthIndicators, "HealthIndicators must not be null");
CompositeHealthIndicator healthIndicator = new CompositeHealthIndicator(
healthAggregator);
for (Map.Entry<String, HealthIndicator> entry : healthIndicators.entrySet()) {
healthIndicator.addHealthIndicator(getKey(entry.getKey()), entry.getValue());
}
this.healthIndicator = healthIndicator;
}
/**
* Time to live for cached result. This is particularly useful to cache the result of
* this endpoint to prevent a DOS attack if it is accessed anonymously.
* @return time to live in milliseconds (default 1000)
*/
public long getTimeToLive() {
return this.timeToLive;
}
public void setTimeToLive(long ttl) {
this.timeToLive = ttl;
}
/**
* Invoke all {@link HealthIndicator} delegates and collect their health information.
*/
@Override
public Health invoke() {
return this.healthIndicator.health();
}
/**
* Turns the bean name into a key that can be used in the map of health information.
* @param name the bean name
* @return the key
*/
private String getKey(String name) {
int index = name.toLowerCase().indexOf("healthindicator");
if (index > 0) {
return name.substring(0, index);
}
return name;
}
}