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.jt400;
  
  import java.io.IOException;
  
  import com.ibm.as400.access.AS400;
  import com.ibm.as400.access.BaseDataQueue;
  import com.ibm.as400.access.DataQueue;
  import com.ibm.as400.access.KeyedDataQueue;
  import org.apache.camel.RuntimeCamelException;
  import org.apache.camel.Service;
  import org.apache.camel.util.ObjectHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.apache.camel.component.jt400.Jt400Configuration.DEFAULT_SYSTEM_CCSID;
  
  /**
   * Pseudo-abstract class that encapsulates Service logic common to {@link Jt400DataQueueConsumer} and
   * {@link Jt400DataQueueProducer}.
   */
  class Jt400DataQueueService implements Service {
  
      /**
       * Logging tool.
       */
      private static final Logger LOG = LoggerFactory.getLogger(Jt400DataQueueService.class);
  
      /**
       * Endpoint which this service connects to.
       */
      private final Jt400Endpoint endpoint;
  
      /**
       * Data queue object that corresponds to the endpoint of this service (null if stopped).
       */
      private BaseDataQueue queue;
  
      /**
       * Creates a {@code Jt400DataQueueService} that connects to the specified endpoint.
       *
       * @param endpoint endpoint which this service connects to
       */
      Jt400DataQueueService(Jt400Endpoint endpoint) {
          ObjectHelper.notNull(endpoint, "endpoint", this);
          this.endpoint = endpoint;
      }
  
      @Override
      public void start() {
          if (queue == null) {
              AS400 system = endpoint.getSystem();
              if (endpoint.isKeyed()) {
                  queue = new KeyedDataQueue(system, endpoint.getObjectPath());
              } else {
                  queue = new DataQueue(system, endpoint.getObjectPath());
              }
          }
          if (endpoint.getConfiguration().getDataQueueCcsid() != DEFAULT_SYSTEM_CCSID) {
              try {
                  queue.setCcsid(endpoint.getConfiguration().getDataQueueCcsid());
              } catch (Exception e) {
                  throw RuntimeCamelException.wrapRuntimeCamelException(e);
              }
          }
          if (!queue.getSystem().isConnected(AS400.DATAQUEUE)) {
              LOG.debug("Connecting to {}", endpoint);
              try {
                  queue.getSystem().connectService(AS400.DATAQUEUE);
              } catch (Exception e) {
                  throw RuntimeCamelException.wrapRuntimeCamelException(e);
              }
          }
      }
  
      @Override
      public void stop() {
          if (queue != null) {
              LOG.debug("Releasing connection to {}", endpoint);
              AS400 system = queue.getSystem();
              queue = null;
              endpoint.releaseSystem(system);
          }
      }
  
      /**
       * Returns the data queue object that this service connects to. Returns {@code null} if the service is stopped.
       *
       * @return the data queue object that this service connects to, or {@code null} if stopped
       */
      public BaseDataQueue getDataQueue() {
          return queue;
      }
  
      @Override
      public void close() throws IOException {
          stop();
      }
  }
  