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.sc;
  
  import io.grpc.Channel;
  import io.grpc.ManagedChannel;
  import io.grpc.Server;
  import io.grpc.ServerServiceDefinition;
  import io.grpc.inprocess.InProcessChannelBuilder;
  import io.grpc.inprocess.InProcessServerBuilder;
  import java.io.IOException;
  import java.util.Collection;
  import java.util.concurrent.CompletableFuture;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.common.concurrent.FutureUtils;
  import org.apache.bookkeeper.stream.storage.api.sc.StorageContainer;
  import org.apache.bookkeeper.stream.storage.api.sc.StorageContainerService;
  import org.apache.bookkeeper.stream.storage.api.sc.StorageContainerServiceFactory;
  import org.apache.bookkeeper.stream.storage.impl.routing.RoutingHeaderProxyInterceptor;
  
  /**
   * The default implementation of {@link StorageContainer}.
   */
  @Slf4j
  class StorageContainerImpl implements StorageContainer {
  
      private final String containerName;
      private final StorageContainerService service;
      private final long scId;
      private final Server grpcServer;
      private volatile Channel channel = Channel404.of();
  
      StorageContainerImpl(StorageContainerServiceFactory serviceFactory, long scId) {
          this.scId = scId;
          this.service = serviceFactory.createStorageContainerService(scId);
          this.containerName = "container-" + scId;
          this.grpcServer = buildGrpcServer(containerName, service.getRegisteredServices());
      }
  
      private static Server buildGrpcServer(String serverName,
                                            Collection<ServerServiceDefinition> services) {
          InProcessServerBuilder builder = InProcessServerBuilder.forName(serverName);
          services.forEach(service -> builder.addService(service));
          return builder
              .directExecutor()
              .build();
      }
  
      //
      // Services
      //
  
      @Override
      public long getId() {
          return scId;
      }
  
      @Override
      public CompletableFuture<StorageContainer> start() {
          log.info("Starting storage container ({}) ...", getId());
  
          return service.start().thenCompose(ignored -> {
              try {
                  grpcServer.start();
                  log.info("Successfully started storage container ({}).", getId());
  
                  channel = InProcessChannelBuilder.forName(containerName)
                      .usePlaintext()
                      .directExecutor()
                      // attach routing header interceptor
                      .intercept(new RoutingHeaderProxyInterceptor())
                      .build();
                  return FutureUtils.value(StorageContainerImpl.this);
              } catch (IOException e) {
                  log.error("Failed to start the grpc server for storage container ({})", getId(), e);
                  return FutureUtils.exception(e);
              }
          });
      }
  
      @Override
      public CompletableFuture<Void> stop() {
          log.info("Stopping storage container ({}) ...", getId());
  
          Channel existingChannel = channel;
  
          // set channel to 404
          channel = Channel404.of();
  
          if (null != existingChannel) {
              if (existingChannel instanceof ManagedChannel) {
                  ((ManagedChannel) existingChannel).shutdown();
              }
          }
  
          if (null != grpcServer) {
              grpcServer.shutdown();
          }
  
          return service.stop().thenApply(ignored -> {
  
              log.info("Successfully stopped storage container ({}).", getId());
              return null;
          });
      }
  
      //
      // Grpc
      //
  
      @Override
      public Channel getChannel() {
          return channel;
      }
  
      @Override
      public void close() {
          stop().join();
      }
  
  }
  