content: /*
   * 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.camel.component.micrometer;
  
  import java.util.function.Function;
  
  import io.micrometer.core.instrument.Counter;
  import io.micrometer.core.instrument.MeterRegistry;
  import io.micrometer.core.instrument.Tag;
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  
  import static org.apache.camel.component.micrometer.MicrometerConstants.HEADER_COUNTER_DECREMENT;
  import static org.apache.camel.component.micrometer.MicrometerConstants.HEADER_COUNTER_INCREMENT;
  
  public class CounterProducer extends AbstractMicrometerProducer<Counter> {
  
      public CounterProducer(MicrometerEndpoint endpoint) {
          super(endpoint);
      }
  
      @Override
      protected Function<MeterRegistry, Counter> registrar(String name, String description, Iterable<Tag> tags) {
          return meterRegistry -> Counter.builder(name).description(description).tags(tags).register(meterRegistry);
      }
  
      @Override
      protected void doProcess(Exchange exchange, MicrometerEndpoint endpoint, Counter counter) {
          Message in = exchange.getIn();
          Double increment = simple(exchange, endpoint.getIncrement(), Double.class);
          Double decrement = simple(exchange, endpoint.getDecrement(), Double.class);
          Double finalIncrement = getDoubleHeader(in, HEADER_COUNTER_INCREMENT, increment);
          Double finalDecrement = getDoubleHeader(in, HEADER_COUNTER_DECREMENT, decrement);
          if (finalIncrement != null) {
              counter.increment(finalIncrement);
          } else if (finalDecrement != null) {
              counter.increment(-finalDecrement);
          } else {
              counter.increment();
          }
      }
  }
  