/*
* Copyright 2012-2017 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.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.springframework.boot.actuate.metrics.Metric;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.util.Assert;
/**
* {@link Endpoint} to expose a collection of {@link PublicMetrics}.
*
* @author Dave Syer
*/
@ConfigurationProperties(prefix = "endpoints.metrics")
public class MetricsEndpoint extends AbstractEndpoint<Map<String, Object>> {
private final List<PublicMetrics> publicMetrics;
/**
* Create a new {@link MetricsEndpoint} instance.
* @param publicMetrics the metrics to expose
*/
public MetricsEndpoint(PublicMetrics publicMetrics) {
this(Collections.singleton(publicMetrics));
}
/**
* Create a new {@link MetricsEndpoint} instance.
* @param publicMetrics the metrics to expose. The collection will be sorted using the
* {@link AnnotationAwareOrderComparator}.
*/
public MetricsEndpoint(Collection<PublicMetrics> publicMetrics) {
super("metrics");
Assert.notNull(publicMetrics, "PublicMetrics must not be null");
this.publicMetrics = new ArrayList<>(publicMetrics);
AnnotationAwareOrderComparator.sort(this.publicMetrics);
}
public void registerPublicMetrics(PublicMetrics metrics) {
this.publicMetrics.add(metrics);
AnnotationAwareOrderComparator.sort(this.publicMetrics);
}
public void unregisterPublicMetrics(PublicMetrics metrics) {
this.publicMetrics.remove(metrics);
}
@Override
public Map<String, Object> invoke() {
Map<String, Object> result = new LinkedHashMap<>();
List<PublicMetrics> metrics = new ArrayList<>(this.publicMetrics);
for (PublicMetrics publicMetric : metrics) {
try {
for (Metric<?> metric : publicMetric.metrics()) {
result.put(metric.getName(), metric.getValue());
}
}
catch (Exception ex) {
// Could not evaluate metrics
}
}
return result;
}
}