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.MetricRegistry;
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.support.DefaultProducer;
  import org.apache.camel.util.ObjectHelper;
  
  public abstract class AbstractMetricsProducer extends DefaultProducer {
  
      public static final String HEADER_PATTERN = MetricsConstants.HEADER_PREFIX + "*";
  
      protected AbstractMetricsProducer(MetricsEndpoint endpoint) {
          super(endpoint);
      }
  
      @Override
      public MetricsEndpoint getEndpoint() {
          return (MetricsEndpoint) super.getEndpoint();
      }
  
      @Override
      public void process(Exchange exchange) throws Exception {
          Message in = exchange.getIn();
          String defaultMetricsName = getEndpoint().getMetricsName();
          String finalMetricsName = getMetricsName(in, defaultMetricsName);
          MetricRegistry registry = getEndpoint().getRegistry();
  
          try {
              doProcess(exchange, getEndpoint(), registry, finalMetricsName);
          } catch (Exception e) {
              exchange.setException(e);
          } finally {
              clearMetricsHeaders(in);
          }
      }
  
      protected abstract void doProcess(Exchange exchange, MetricsEndpoint endpoint, MetricRegistry registry, String metricsName)
              throws Exception;
  
      public String getMetricsName(Message in, String defaultValue) {
          return getStringHeader(in, MetricsConstants.HEADER_METRIC_NAME, defaultValue);
      }
  
      public String getStringHeader(Message in, String header, String defaultValue) {
          String headerValue = in.getHeader(header, String.class);
          return ObjectHelper.isNotEmpty(headerValue) ? headerValue : defaultValue;
      }
  
      public Long getLongHeader(Message in, String header, Long defaultValue) {
          return in.getHeader(header, defaultValue, Long.class);
      }
  
      protected boolean clearMetricsHeaders(Message in) {
          return in.removeHeaders(HEADER_PATTERN);
      }
  }
  