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.MeterRegistry;
  import io.micrometer.core.instrument.Tag;
  import io.micrometer.core.instrument.Timer;
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  
  import static org.apache.camel.component.micrometer.MicrometerConstants.HEADER_TIMER_ACTION;
  
  public class TimerProducer extends AbstractMicrometerProducer<Timer> {
  
      public TimerProducer(MicrometerEndpoint endpoint) {
          super(endpoint);
      }
  
      @Override
      protected Function<MeterRegistry, Timer> registrar(String name, String description, Iterable<Tag> tags) {
          return meterRegistry -> Timer.builder(name).description(description).tags(tags).register(meterRegistry);
      }
  
      @Override
      protected void doProcess(Exchange exchange, MicrometerEndpoint endpoint, Timer timer) {
          String propertyName = getPropertyName(timer.getId().getName());
          Timer.Sample sample = getTimerSampleFromExchange(exchange, propertyName);
          sample.stop(timer);
          exchange.removeProperty(propertyName);
      }
  
      @Override
      protected void doProcess(Exchange exchange, String metricsName, String metricsDescription, Iterable<Tag> tags) {
          MeterRegistry registry = getEndpoint().getRegistry();
          Message in = exchange.getIn();
          MicrometerTimerAction action = simple(exchange, getEndpoint().getAction(), MicrometerTimerAction.class);
          MicrometerTimerAction finalAction = in.getHeader(HEADER_TIMER_ACTION, action, MicrometerTimerAction.class);
          if (finalAction == MicrometerTimerAction.start) {
              handleStart(exchange, registry, metricsName);
          } else if (finalAction == MicrometerTimerAction.stop) {
              handleStop(exchange, metricsName, metricsDescription, tags);
          }
      }
  
      private void handleStop(Exchange exchange, String metricsName, String metricsDescription, Iterable<Tag> tags) {
          if (getTimerSampleFromExchange(exchange, getPropertyName(metricsName)) != null) {
              doProcess(exchange, getEndpoint(), getOrRegisterMeter(metricsName, metricsDescription, tags));
          }
      }
  
      void handleStart(Exchange exchange, MeterRegistry registry, String metricsName) {
          String propertyName = getPropertyName(metricsName);
          Timer.Sample sample = getTimerSampleFromExchange(exchange, propertyName);
          if (sample == null) {
              sample = Timer.start(registry);
              exchange.setProperty(propertyName, sample);
          }
      }
  
      String getPropertyName(String metricsName) {
          return "timer:" + metricsName;
      }
  
      Timer.Sample getTimerSampleFromExchange(Exchange exchange, String propertyName) {
          return exchange.getProperty(propertyName, Timer.Sample.class);
      }
  }
  