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.clients;
  
  import io.grpc.Channel;
  import io.grpc.ClientInterceptors;
  import io.grpc.ManagedChannel;
  import java.util.concurrent.CompletableFuture;
  import org.apache.bookkeeper.clients.config.StorageClientSettings;
  import org.apache.bookkeeper.clients.impl.container.StorageContainerClientInterceptor;
  import org.apache.bookkeeper.clients.utils.ClientResources;
  import org.apache.bookkeeper.clients.utils.GrpcChannels;
  import org.apache.bookkeeper.clients.utils.RetryUtils;
  import org.apache.bookkeeper.common.util.AbstractAutoAsyncCloseable;
  import org.apache.bookkeeper.common.util.OrderedScheduler;
  import org.apache.bookkeeper.common.util.SharedResourceManager;
  import org.apache.bookkeeper.common.util.SharedResourceManager.Resource;
  
  /**
   * Simple client implementation base.
   */
  public class SimpleClientBase extends AbstractAutoAsyncCloseable {
  
      protected final StorageClientSettings settings;
      protected final Resource<OrderedScheduler> schedulerResource;
      protected final OrderedScheduler scheduler;
      protected final ManagedChannel managedChannel;
      protected final boolean ownChannel;
      protected final Channel channel;
      protected final RetryUtils retryUtils;
  
      protected SimpleClientBase(StorageClientSettings settings) {
          this(settings, ClientResources.create().scheduler());
      }
  
      protected SimpleClientBase(StorageClientSettings settings,
                                 Resource<OrderedScheduler> schedulerResource) {
          this(
              settings,
              schedulerResource,
              GrpcChannels.createChannelBuilder(settings.serviceUri(), settings).build(),
              true);
      }
  
      protected SimpleClientBase(StorageClientSettings settings,
                                 Resource<OrderedScheduler> schedulerResource,
                                 ManagedChannel managedChannel,
                                 boolean ownChannel) {
          this.settings = settings;
          this.managedChannel = managedChannel;
          this.ownChannel = ownChannel;
          this.channel = ClientInterceptors.intercept(
              managedChannel,
              new StorageContainerClientInterceptor(0L));
          this.schedulerResource = schedulerResource;
          this.scheduler = SharedResourceManager.shared().get(schedulerResource);
          this.retryUtils = RetryUtils.create(settings.backoffPolicy(), scheduler);
      }
  
      @Override
      protected void closeAsyncOnce(CompletableFuture<Void> closeFuture) {
          if (ownChannel) {
              managedChannel.shutdown();
          }
          SharedResourceManager.shared().release(schedulerResource, scheduler);
          closeFuture.complete(null);
      }
  }
  