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.grpc.server;
  
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.CountDownLatch;
  
  import io.grpc.stub.StreamObserver;
  import org.apache.camel.component.grpc.GrpcConsumer;
  import org.apache.camel.component.grpc.GrpcEndpoint;
  
  /**
   * This is the default consumer strategy for client-streaming and bi-directional streaming gRPC calls. gRPC request
   * stream observer which is propagating every onNext(), onError() or onCompleted() calls to the Camel route.
   */
  public class GrpcRequestPropagationStreamObserver extends GrpcRequestAbstractStreamObserver {
  
      public GrpcRequestPropagationStreamObserver(GrpcEndpoint endpoint, GrpcConsumer consumer,
                                                  StreamObserver<Object> responseObserver, Map<String, Object> headers) {
          super(endpoint, consumer, responseObserver, headers);
      }
  
      @Override
      public void onNext(Object request) {
          CountDownLatch latch = new CountDownLatch(1);
  
          exchange = endpoint.createExchange();
          exchange.getIn().setBody(request);
          exchange.getIn().setHeaders(headers);
  
          consumer.process(exchange, doneSync -> latch.countDown());
  
          try {
              latch.await();
  
              Object responseBody = exchange.getMessage().getBody();
              if (responseBody instanceof List) {
                  List<?> responseList = (List<?>) responseBody;
                  responseList.forEach(responseObserver::onNext);
              } else {
                  responseObserver.onNext(responseBody);
              }
          } catch (InterruptedException e) {
              Thread.currentThread().interrupt();
              responseObserver.onError(e);
  
          }
      }
  
      @Override
      public void onError(Throwable throwable) {
          exchange = endpoint.createExchange();
          exchange.getIn().setHeaders(headers);
          consumer.onError(exchange, throwable);
          responseObserver.onError(throwable);
      }
  
      @Override
      public void onCompleted() {
          exchange = endpoint.createExchange();
          exchange.getIn().setHeaders(headers);
          consumer.onCompleted(exchange);
          responseObserver.onCompleted();
      }
  }
  