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 java.lang.reflect.Field;
  import java.util.Collections;
  import java.util.Map;
  
  import org.apache.avro.Protocol;
  import org.apache.avro.reflect.ReflectData;
  import org.apache.camel.AsyncEndpoint;
  import org.apache.camel.Category;
  import org.apache.camel.Component;
  import org.apache.camel.Consumer;
  import org.apache.camel.Processor;
  import org.apache.camel.spi.UriEndpoint;
  import org.apache.camel.spi.UriParam;
  import org.apache.camel.support.DefaultEndpoint;
  
  /**
   * Produce or consume Apache Avro RPC services.
   */
  @UriEndpoint(firstVersion = "2.10.0", scheme = "avro", title = "Avro RPC", syntax = "avro:transport:host:port/messageName",
               category = { Category.RPC }, headersClass = AvroConstants.class)
  public abstract class AvroEndpoint extends DefaultEndpoint implements AsyncEndpoint {
  
      @UriParam
      private AvroConfiguration configuration;
  
      protected AvroEndpoint(String endpointUri, Component component, AvroConfiguration configuration) {
          super(endpointUri, component);
          this.configuration = configuration;
      }
  
      @Override
      public boolean isSingletonProducer() {
          return false;
      }
  
      @Override
      public Consumer createConsumer(Processor processor) throws Exception {
          AvroConsumer consumer = new AvroConsumer(this, processor);
          configureConsumer(consumer);
          return consumer;
      }
  
      public AvroConfiguration getConfiguration() {
          return configuration;
      }
  
      @Override
      protected void doInit() throws Exception {
          super.doInit();
  
          validateConfiguration(configuration);
      }
  
      /**
       * Validates configuration
       */
      private void validateConfiguration(AvroConfiguration config) throws Exception {
          if (config.getProtocol() == null && config.getProtocolClassName() != null) {
              Class<?> protocolClass = getCamelContext().getClassResolver().resolveClass(config.getProtocolClassName());
              if (protocolClass != null) {
                  try {
                      Field f = protocolClass.getField("PROTOCOL");
                      if (f != null) {
                          Protocol protocol = (Protocol) f.get(null);
                          config.setProtocol(protocol);
                      }
                  } catch (NoSuchFieldException e) {
                      ReflectData reflectData = ReflectData.get();
                      config.setProtocol(reflectData.getProtocol(protocolClass));
                      config.setReflectionProtocol(true);
                  }
              }
          }
  
          if (config.getProtocol() == null) {
              throw new IllegalArgumentException("Avro configuration does not contain protocol");
          }
  
          if (config.getMessageName() != null && !config.getProtocol().getMessages().containsKey(config.getMessageName())) {
              throw new IllegalArgumentException("Message " + config.getMessageName() + " is not defined in protocol");
          }
  
          if (config.isSingleParameter()) {
              Map<String, Protocol.Message> messageMap = config.getProtocol().getMessages();
              Iterable<Protocol.Message> messagesToCheck = config.getMessageName() == null
                      ? messageMap.values()
                      : Collections.singleton(messageMap.get(config.getMessageName()));
              for (Protocol.Message message : messagesToCheck) {
                  if (message.getRequest().getFields().size() != 1) {
                      throw new IllegalArgumentException(
                              "Single parameter option can't be used with message "
                                                         + message.getName() + " because it has "
                                                         + message.getRequest().getFields().size()
                                                         + " parameters defined");
                  }
              }
          }
      }
  }
  