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 static org.apache.bookkeeper.common.util.ListenableFutures.fromListenableFuture;
  
  import com.google.common.annotations.VisibleForTesting;
  import com.google.common.util.concurrent.ListenableFuture;
  import io.grpc.Status;
  import io.grpc.StatusException;
  import io.grpc.StatusRuntimeException;
  import java.util.concurrent.CompletableFuture;
  import java.util.function.Predicate;
  import java.util.function.Supplier;
  import org.apache.bookkeeper.common.util.Backoff;
  import org.apache.bookkeeper.common.util.OrderedScheduler;
  import org.apache.bookkeeper.common.util.Retries;
  
  /**
   * Retry Utils.
   */
  public class RetryUtils {
  
      @VisibleForTesting
      static final Predicate<Throwable> DEFAULT_CLIENT_RETRY_PREDICATE =
          cause -> shouldRetryOnException(cause);
  
      private static boolean shouldRetryOnException(Throwable cause) {
          if (cause instanceof StatusRuntimeException || cause instanceof StatusException) {
              Status status;
              if (cause instanceof StatusException) {
                  status = ((StatusException) cause).getStatus();
              } else {
                  status = ((StatusRuntimeException) cause).getStatus();
              }
              switch (status.getCode()) {
                  case INVALID_ARGUMENT:
                  case ALREADY_EXISTS:
                  case PERMISSION_DENIED:
                  case UNAUTHENTICATED:
                      return false;
                  default:
                      return true;
              }
          } else if (cause instanceof RuntimeException) {
              return false;
          } else {
              // storage level exceptions
              return false;
          }
      }
  
      public static RetryUtils create(Backoff.Policy backoffPolicy,
                                      OrderedScheduler scheduler) {
          return create(DEFAULT_CLIENT_RETRY_PREDICATE, backoffPolicy, scheduler);
      }
  
      public static RetryUtils create(Predicate<Throwable> retryPredicate,
                                      Backoff.Policy backoffPolicy,
                                      OrderedScheduler scheduler) {
          return new RetryUtils(retryPredicate, backoffPolicy, scheduler);
      }
  
      private final Predicate<Throwable> retryPredicate;
      private final Backoff.Policy backoffPolicy;
      private final OrderedScheduler scheduler;
  
      private RetryUtils(Predicate<Throwable> retryPredicate,
                         Backoff.Policy backoffPolicy,
                         OrderedScheduler scheduler) {
          this.retryPredicate = retryPredicate;
          this.backoffPolicy = backoffPolicy;
          this.scheduler = scheduler;
      }
  
      /**
       * Run the action with retries.
       *
       * @param action action to run
       * @return the result of the action
       */
      public <T> CompletableFuture<T> execute(Supplier<CompletableFuture<T>> action) {
          return Retries.run(
              backoffPolicy.toBackoffs(),
              retryPredicate,
              action,
              scheduler
          );
      }
  
      /**
       * Run the action with retries.
       *
       * @param action action to run
       * @return the result of the action
       */
      public <T> CompletableFuture<T> executeListenable(Supplier<ListenableFuture<T>> action) {
          return Retries.run(
              backoffPolicy.toBackoffs(),
              retryPredicate,
              () -> fromListenableFuture(action.get()),
              scheduler
          );
      }
  
  }
  