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
   *
   *     https://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.avro.ipc.specific;
  
  import java.io.IOException;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  
  import org.apache.avro.Schema;
  import org.apache.avro.Protocol;
  import org.apache.avro.Protocol.Message;
  import org.apache.avro.AvroRuntimeException;
  import org.apache.avro.io.DatumReader;
  import org.apache.avro.io.DatumWriter;
  import org.apache.avro.io.Encoder;
  import org.apache.avro.generic.GenericRecord;
  import org.apache.avro.specific.SpecificData;
  import org.apache.avro.specific.SpecificDatumReader;
  import org.apache.avro.specific.SpecificDatumWriter;
  import org.apache.avro.ipc.generic.GenericResponder;
  
  /** {@link org.apache.avro.ipc.Responder Responder} for generated interfaces. */
  public class SpecificResponder extends GenericResponder {
    private Object impl;
  
    public SpecificResponder(Class iface, Object impl) {
      this(iface, impl, new SpecificData(impl.getClass().getClassLoader()));
    }
  
    public SpecificResponder(Protocol protocol, Object impl) {
      this(protocol, impl, new SpecificData(impl.getClass().getClassLoader()));
    }
  
    public SpecificResponder(Class iface, Object impl, SpecificData data) {
      this(data.getProtocol(iface), impl, data);
    }
  
    public SpecificResponder(Protocol protocol, Object impl, SpecificData data) {
      super(protocol, data);
      this.impl = impl;
    }
  
    public SpecificData getSpecificData() {
      return (SpecificData) getGenericData();
    }
  
    @Override
    protected DatumWriter<Object> getDatumWriter(Schema schema) {
      return new SpecificDatumWriter<>(schema, getSpecificData());
    }
  
    @Override
    protected DatumReader<Object> getDatumReader(Schema actual, Schema expected) {
      return new SpecificDatumReader<>(actual, expected, getSpecificData());
    }
  
    @Override
    public void writeError(Schema schema, Object error, Encoder out) throws IOException {
      getDatumWriter(schema).write(error, out);
    }
  
    @Override
    public Object respond(Message message, Object request) throws Exception {
      int numParams = message.getRequest().getFields().size();
      Object[] params = new Object[numParams];
      Class[] paramTypes = new Class[numParams];
      int i = 0;
      try {
        for (Schema.Field param : message.getRequest().getFields()) {
          params[i] = ((GenericRecord) request).get(param.name());
          paramTypes[i] = getSpecificData().getClass(param.schema());
          i++;
        }
        Method method = impl.getClass().getMethod(message.getName(), paramTypes);
        method.setAccessible(true);
        return method.invoke(impl, params);
      } catch (InvocationTargetException e) {
        Throwable error = e.getTargetException();
        if (error instanceof Exception) {
          throw (Exception) error;
        } else {
          throw new AvroRuntimeException(error);
        }
      } catch (NoSuchMethodException | IllegalAccessException e) {
        throw new AvroRuntimeException(e);
      }
    }
  
  }
  