/*
* 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.metrics.writer;
import java.util.concurrent.ConcurrentHashMap;
import org.springframework.boot.actuate.metrics.GaugeService;
import org.springframework.boot.actuate.metrics.Metric;
/**
* Default implementation of {@link GaugeService}.
*
* @author Dave Syer
*/
public class DefaultGaugeService implements GaugeService {
private final MetricWriter writer;
private final ConcurrentHashMap<String, String> names = new ConcurrentHashMap<>();
/**
* Create a {@link DefaultGaugeService} instance.
* @param writer the underlying writer used to manage metrics
*/
public DefaultGaugeService(MetricWriter writer) {
this.writer = writer;
}
@Override
public void submit(String metricName, double value) {
this.writer.set(new Metric<>(wrap(metricName), value));
}
private String wrap(String metricName) {
String cached = this.names.get(metricName);
if (cached != null) {
return cached;
}
if (metricName.startsWith("gauge") || metricName.startsWith("histogram")
|| metricName.startsWith("timer")) {
return metricName;
}
String name = "gauge." + metricName;
this.names.put(metricName, name);
return name;
}
}