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.metrics;
  
  import com.codahale.metrics.Histogram;
  import com.codahale.metrics.MetricRegistry;
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.apache.camel.component.metrics.MetricsConstants.HEADER_HISTOGRAM_VALUE;
  
  public class HistogramProducer extends AbstractMetricsProducer {
  
      private static final Logger LOG = LoggerFactory.getLogger(HistogramProducer.class);
  
      public HistogramProducer(MetricsEndpoint endpoint) {
          super(endpoint);
      }
  
      @Override
      protected void doProcess(Exchange exchange, MetricsEndpoint endpoint, MetricRegistry registry, String metricsName)
              throws Exception {
          Message in = exchange.getIn();
          Histogram histogram = registry.histogram(metricsName);
          Long value = endpoint.getValue();
          Long finalValue = getLongHeader(in, HEADER_HISTOGRAM_VALUE, value);
          if (finalValue != null) {
              histogram.update(finalValue);
          } else {
              LOG.warn("Cannot update histogram \"{}\" with null value", metricsName);
          }
      }
  }
  