solr/contrib/prometheus-exporter/src/java/org/apache/solr/prometheus/exporter/CachedPrometheusCollector.java

/*
 * 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 "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.apache.solr.prometheus.exporter;

import java.util.List;

import io.prometheus.client.Collector;
import org.apache.solr.prometheus.collector.SchedulerMetricsCollector;

public class CachedPrometheusCollector extends Collector implements SchedulerMetricsCollector.Observer {

  private volatile List<MetricFamilySamples> samples;

  @Override
  public List<MetricFamilySamples> collect() {
    return samples;
  }

  @Override
  public void metricsUpdated(List<MetricFamilySamples> samples) {
    this.samples = samples;
  }

}