code: /*
   * 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.skywalking.oap.server.library.util.prometheus.metrics;
  
  import java.util.Map;
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.Singular;
  import lombok.ToString;
  
  @EqualsAndHashCode(callSuper = true)
  @ToString(callSuper = true)
  @Getter
  public class Gauge extends Metric {
  
      private double value;
  
      @lombok.Builder
      public Gauge(String name, @Singular Map<String, String> labels, double value, long timestamp) {
          super(name, labels, timestamp);
          this.value = value;
      }
  
      @Override public Metric sum(Metric m) {
          this.value = this.value + m.value();
          return this;
      }
  
      @Override public Double value() {
          return this.value;
      }
  }
  