org.apache.pulsar.functions.instance.stats.FunctionCollectorRegistryImpl Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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*/
package org.apache.pulsar.functions.instance.stats;
import io.prometheus.client.Collector;
import java.util.HashMap;
import java.util.Map;
public class FunctionCollectorRegistryImpl extends FunctionCollectorRegistry {
private final Map namesToCollectors = new HashMap();
public Collector registerIfNotExist(String metricName, Collector collector) {
synchronized (this) {
Collector existingCollector = namesToCollectors.get(metricName);
if (existingCollector == null) {
namesToCollectors.put(metricName, collector);
super.register(collector);
return collector;
}
return existingCollector;
}
}
}