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.utils;
  
  import com.google.common.util.concurrent.ThreadFactoryBuilder;
  import io.netty.util.HashedWheelTimer;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.TimeUnit;
  import org.apache.bookkeeper.common.util.OrderedScheduler;
  import org.apache.bookkeeper.common.util.SharedResourceManager.Resource;
  
  /**
   * Define a set of resources used for storage.
   */
  public class ClientResources {
  
      private static final ClientResources SHARED = create();
  
      public static ClientResources shared() {
          return SHARED;
      }
  
      public static ClientResources create() {
          return new ClientResources();
      }
  
      private final Resource<OrderedScheduler> scheduler;
      private final Resource<HashedWheelTimer> timer;
      private final Resource<ExecutorService> executor;
  
      private ClientResources() {
          this.scheduler =
              new Resource<OrderedScheduler>() {
  
                  private static final String name = "client-scheduler";
  
                  @Override
                  public OrderedScheduler create() {
                      return OrderedScheduler.newSchedulerBuilder()
                          .numThreads(Runtime.getRuntime().availableProcessors() * 2)
                          .name(name)
                          .build();
                  }
  
                  @Override
                  public void close(OrderedScheduler instance) {
                      instance.shutdown();
                  }
  
                  @Override
                  public String toString() {
                      return name;
                  }
              };
  
          this.timer =
              new Resource<HashedWheelTimer>() {
  
                  private static final String name = "client-timer";
  
                  @Override
                  public HashedWheelTimer create() {
                      HashedWheelTimer timer = new HashedWheelTimer(
                          new ThreadFactoryBuilder()
                              .setNameFormat(name + "-%d")
                              .build(),
                          200,
                          TimeUnit.MILLISECONDS,
                          512,
                          true);
                      timer.start();
                      return timer;
                  }
  
                  @Override
                  public void close(HashedWheelTimer instance) {
                      instance.stop();
                  }
  
                  @Override
                  public String toString() {
                      return name;
                  }
              };
  
          this.executor = new Resource<ExecutorService>() {
  
              private static final String name = "stream-client-executor";
  
              @Override
              public ExecutorService create() {
                  return Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() * 2);
              }
  
              @Override
              public void close(ExecutorService instance) {
                  instance.shutdown();
              }
  
              @Override
              public String toString() {
                  return name;
              }
          };
      }
  
      public Resource<OrderedScheduler> scheduler() {
          return scheduler;
      }
  
      public Resource<HashedWheelTimer> timer() {
          return timer;
      }
  
      public Resource<ExecutorService> executor() {
          return executor;
      }
  
  }
  