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.client;
  
  import io.grpc.stub.StreamObserver;
  import org.apache.camel.AsyncCallback;
  import org.apache.camel.AsyncProducer;
  import org.apache.camel.Endpoint;
  import org.apache.camel.Exchange;
  import org.apache.camel.component.grpc.GrpcConfiguration;
  import org.apache.camel.support.CamelContextHelper;
  import org.apache.camel.support.service.ServiceHelper;
  import org.apache.camel.support.service.ServiceSupport;
  
  public class GrpcStreamObserverFactory extends ServiceSupport {
  
      private final Endpoint sourceEndpoint;
      private final GrpcConfiguration configuration;
  
      private Endpoint endpoint;
      private AsyncProducer producer;
  
      public GrpcStreamObserverFactory(Endpoint sourceEndpoint, GrpcConfiguration configuration) {
          this.sourceEndpoint = sourceEndpoint;
          this.configuration = configuration;
      }
  
      public StreamObserver<Object> getStreamObserver(Exchange exchange, AsyncCallback callback) {
          if (configuration.getStreamRepliesTo() == null) {
              return new GrpcResponseAggregationStreamObserver(exchange, callback);
          } else {
              return new GrpcResponseRouterStreamObserver(configuration, sourceEndpoint, producer, exchange, callback);
          }
      }
  
      @Override
      protected void doStart() throws Exception {
          if (configuration.getStreamRepliesTo() != null) {
              this.endpoint = CamelContextHelper.getMandatoryEndpoint(
                      sourceEndpoint.getCamelContext(), configuration.getStreamRepliesTo());
              this.producer = endpoint.createAsyncProducer();
              ServiceHelper.startService(producer);
          }
      }
  
      @Override
      protected void doStop() throws Exception {
          if (configuration.getStreamRepliesTo() != null) {
              ServiceHelper.stopService(producer);
          }
      }
  }
  