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.jcr;
  
  import java.util.LinkedList;
  import java.util.List;
  
  import javax.jcr.observation.Event;
  import javax.jcr.observation.EventIterator;
  import javax.jcr.observation.EventListener;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.Processor;
  import org.apache.camel.RuntimeCamelException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.apache.camel.RuntimeCamelException.wrapRuntimeCamelException;
  
  /**
   * A JCR {@link EventListener} which can be used to delegate processing to a Camel endpoint.
   */
  public class EndpointEventListener implements EventListener {
  
      private static final Logger LOG = LoggerFactory.getLogger(EndpointEventListener.class);
  
      private final JcrConsumer consumer;
      private final JcrEndpoint endpoint;
      private final Processor processor;
  
      public EndpointEventListener(JcrConsumer consumer, JcrEndpoint endpoint, Processor processor) {
          this.consumer = consumer;
          this.endpoint = endpoint;
          this.processor = processor;
      }
  
      @Override
      public void onEvent(EventIterator events) {
          LOG.trace("onEvent START");
          LOG.debug("{} consumer received JCR events: {}", endpoint, events);
          RuntimeCamelException rce;
  
          final Exchange exchange = createExchange(events);
          try {
  
              try {
                  LOG.debug("Processor, {}, is processing exchange, {}", processor, exchange);
                  processor.process(exchange);
              } catch (Exception e) {
                  exchange.setException(e);
              }
  
              rce = exchange.getException(RuntimeCamelException.class);
          } catch (Exception e) {
              rce = wrapRuntimeCamelException(e);
          } finally {
              consumer.releaseExchange(exchange, false);
          }
  
          if (rce != null) {
              LOG.trace("onEvent END throwing exception: {}", rce.toString());
              throw rce;
          }
  
          LOG.trace("onEvent END");
      }
  
      private Exchange createExchange(EventIterator events) {
          Exchange exchange = consumer.createExchange(false);
  
          List<Event> eventList = new LinkedList<>();
          if (events != null) {
              while (events.hasNext()) {
                  eventList.add(events.nextEvent());
              }
          }
          exchange.getIn().setBody(eventList);
  
          return exchange;
      }
  
  }
  