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.bookkeeper.stream.storage.impl.grpc.handler;
  
  import io.grpc.StatusException;
  import io.grpc.StatusRuntimeException;
  import io.grpc.stub.StreamObserver;
  import java.util.function.BiConsumer;
  
  /**
   * Response handler to handle response.
   */
  public abstract class ResponseHandler<RespT> implements BiConsumer<RespT, Throwable> {
  
      protected final StreamObserver<RespT> respObserver;
  
      protected ResponseHandler(StreamObserver<RespT> respObserver) {
          this.respObserver = respObserver;
      }
  
      protected abstract RespT createErrorResp(Throwable cause);
  
      @Override
      public void accept(RespT respT, Throwable cause) {
          if (null != cause) {
              if (cause instanceof StatusRuntimeException
                  || cause instanceof StatusException) {
                  respObserver.onError(cause);
                  return;
              }
              respObserver.onNext(createErrorResp(cause));
          } else {
              respObserver.onNext(respT);
          }
          respObserver.onCompleted();
      }
  }
  