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.meter.analyzer.dsl;
  
  import com.google.common.collect.ImmutableMap;
  import io.vavr.Function2;
  import io.vavr.Tuple2;
  import java.time.Duration;
  import java.util.function.Function;
  import lombok.Builder;
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.ToString;
  import org.apache.skywalking.oap.meter.analyzer.dsl.counter.CounterWindow;
  
  /**
   * Sample represents the metric data point in a range of time.
   */
  @Builder(toBuilder = true)
  @EqualsAndHashCode
  @ToString
  @Getter
  public class Sample {
      final String name;
      final ImmutableMap<String, String> labels;
      final double value;
      final long timestamp;
  
      Sample newValue(Function<Double, Double> transform) {
          return toBuilder().value(transform.apply(value)).build();
      }
  
      Sample increase(String range, Function2<Double, Long, Double> transform) {
          Tuple2<Long, Double> i = CounterWindow.INSTANCE.increase(name, labels, value, Duration.parse(range).toMillis(), timestamp);
          double nv = transform.apply(i._2, i._1);
          return newValue(ignored -> nv);
      }
  
      Sample increase(Function2<Double, Long, Double> transform) {
          Tuple2<Long, Double> i = CounterWindow.INSTANCE.pop(name, labels, value, timestamp);
          double nv = transform.apply(i._2, i._1);
          return newValue(ignored -> nv);
      }
  }
  