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.telemetry.none;
  
  import org.apache.skywalking.oap.server.telemetry.api.CounterMetrics;
  import org.apache.skywalking.oap.server.telemetry.api.GaugeMetrics;
  import org.apache.skywalking.oap.server.telemetry.api.HistogramMetrics;
  import org.apache.skywalking.oap.server.telemetry.api.MetricsCreator;
  import org.apache.skywalking.oap.server.telemetry.api.MetricsTag;
  
  /**
   * A no-op metrics create, just create nut shell metrics instance.
   */
  public class MetricsCreatorNoop implements MetricsCreator {
      @Override
      public CounterMetrics createCounter(String name, String tips, MetricsTag.Keys tagKeys,
          MetricsTag.Values tagValues) {
          return new CounterMetrics() {
              @Override
              public void inc() {
  
              }
  
              @Override
              public void inc(double value) {
  
              }
          };
      }
  
      @Override
      public GaugeMetrics createGauge(String name, String tips, MetricsTag.Keys tagKeys, MetricsTag.Values tagValues) {
          return new GaugeMetrics() {
              @Override
              public void inc() {
  
              }
  
              @Override
              public void inc(double value) {
  
              }
  
              @Override
              public void dec() {
  
              }
  
              @Override
              public void dec(double value) {
  
              }
  
              @Override
              public void setValue(double value) {
  
              }
  
              @Override
              public double getValue() {
                  return 0;
              }
          };
      }
  
      @Override
      public HistogramMetrics createHistogramMetric(String name, String tips, MetricsTag.Keys tagKeys,
          MetricsTag.Values tagValues, double... buckets) {
          return new HistogramMetrics() {
              @Override
              public void observe(double value) {
  
              }
          };
      }
  }
  