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.avro;
  
  import org.apache.avro.ipc.Callback;
  import org.apache.avro.ipc.Requestor;
  import org.apache.avro.ipc.Transceiver;
  import org.apache.camel.AsyncCallback;
  import org.apache.camel.Endpoint;
  import org.apache.camel.Exchange;
  import org.apache.camel.support.DefaultAsyncProducer;
  import org.apache.commons.lang3.StringUtils;
  
  public abstract class AvroProducer extends DefaultAsyncProducer {
  
      Transceiver transceiver;
      Requestor requestor;
  
      protected AvroProducer(Endpoint endpoint) {
          super(endpoint);
      }
  
      @Override
      public boolean isSingleton() {
          return false;
      }
  
      public abstract Transceiver createTransceiver() throws Exception;
  
      @Override
      public boolean process(final Exchange exchange, final AsyncCallback callback) {
          Object request = exchange.getIn().getBody();
  
          try {
              String messageName;
              if (!StringUtils.isEmpty(exchange.getIn().getHeader(AvroConstants.AVRO_MESSAGE_NAME, String.class))) {
                  messageName = exchange.getIn().getHeader(AvroConstants.AVRO_MESSAGE_NAME, String.class);
              } else {
                  messageName = getEndpoint().getConfiguration().getMessageName();
              }
  
              requestor.request(messageName, wrapObjectToArray(request), new Callback<>() {
                  @Override
                  public void handleResult(Object result) {
                      // got result from avro, so set it on the exchange and invoke the callback
                      try {
                          // propagate headers
                          exchange.getOut().setHeaders(exchange.getIn().getHeaders());
                          exchange.getOut().setBody(result);
                      } finally {
                          callback.done(false);
                      }
                  }
  
                  @Override
                  public void handleError(Throwable error) {
                      // got error from avro, so set it on the exchange and invoke the callback
                      try {
                          exchange.setException(error);
                      } finally {
                          callback.done(false);
                      }
                  }
              });
          } catch (Exception e) {
              exchange.setException(e);
              callback.done(true);
              return true;
          }
  
          // okay we continue routing asynchronously
          return false;
      }
  
      public Object[] wrapObjectToArray(Object object) {
          if (object instanceof Object[]) {
              return (Object[]) object;
          } else {
              Object[] wrapper = new Object[1];
              wrapper[0] = object;
              return wrapper;
          }
      }
  
      @Override
      protected void doStart() throws Exception {
          super.doStart();
          transceiver = createTransceiver();
          AvroConfiguration configuration = getEndpoint().getConfiguration();
          if (configuration.isReflectionProtocol()) {
              requestor = new AvroReflectRequestor(configuration.getProtocol(), transceiver);
          } else {
              requestor = new AvroSpecificRequestor(configuration.getProtocol(), transceiver);
          }
      }
  
      @Override
      protected void doStop() throws Exception {
          if (transceiver != null) {
              transceiver.close();
              transceiver = null;
          }
          requestor = null;
          super.doStop();
      }
  
      @Override
      public AvroEndpoint getEndpoint() {
          return (AvroEndpoint) super.getEndpoint();
      }
  }
  