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.grpc;
  
  import org.apache.avro.Protocol;
  
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  import io.grpc.MethodDescriptor;
  import org.apache.avro.util.MapUtil;
  
  import static io.grpc.MethodDescriptor.generateFullMethodName;
  
  /** Descriptor for a gRPC service based on a Avro interface. */
  class ServiceDescriptor {
  
    // cache for service descriptors.
    private static final ConcurrentMap<String, ServiceDescriptor> SERVICE_DESCRIPTORS = new ConcurrentHashMap<>();
    private final String serviceName;
    private final Protocol protocol;
    // cache for method descriptors.
    private final ConcurrentMap<String, MethodDescriptor<Object[], Object>> methods = new ConcurrentHashMap<>();
  
    private ServiceDescriptor(Class iface, String serviceName) {
      this.serviceName = serviceName;
      this.protocol = AvroGrpcUtils.getProtocol(iface);
    }
  
    /**
     * Creates a Service Descriptor.
     *
     * @param iface Avro RPC interface.
     */
    public static ServiceDescriptor create(Class iface) {
      String serviceName = AvroGrpcUtils.getServiceName(iface);
      return MapUtil.computeIfAbsent(SERVICE_DESCRIPTORS, serviceName, key -> new ServiceDescriptor(iface, serviceName));
    }
  
    /**
     * provides name of the service.
     */
    public String getServiceName() {
      return serviceName;
    }
  
    /**
     * Provides a gRPC {@link MethodDescriptor} for a RPC method/message of Avro
     * {@link Protocol}.
     *
     * @param methodType gRPC type for the method.
     * @return a {@link MethodDescriptor}
     */
    public MethodDescriptor<Object[], Object> getMethod(String methodName, MethodDescriptor.MethodType methodType) {
      return MapUtil.computeIfAbsent(methods, methodName,
          key -> MethodDescriptor.<Object[], Object>newBuilder()
              .setFullMethodName(generateFullMethodName(serviceName, methodName)).setType(methodType)
              .setRequestMarshaller(new AvroRequestMarshaller(protocol.getMessages().get(methodName)))
              .setResponseMarshaller(new AvroResponseMarshaller(protocol.getMessages().get(methodName))).build());
    }
  }
  