text: // Copyright 2018 Google LLC
  //
  // Licensed 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.
  
  #ifndef GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_STORAGE_RETRY_POLICY_H_
  #define GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_STORAGE_RETRY_POLICY_H_
  
  #include "google/cloud/internal/backoff_policy.h"
  #include "google/cloud/internal/retry_policy.h"
  #include "google/cloud/status.h"
  
  namespace google {
  namespace cloud {
  namespace storage {
  inline namespace STORAGE_CLIENT_NS {
  namespace internal {
  /// Defines what error codes are permanent errors.
  struct StatusTraits {
    static bool IsPermanentFailure(Status const& status) {
      return status.status_code() != StatusCode::kDeadlineExceeded and
             status.status_code() != StatusCode::kInternal and
             status.status_code() != StatusCode::kUnavailable;
    }
  };
  }  // namespace internal
  
  /// The retry policy base class
  using RetryPolicy =
      google::cloud::internal::RetryPolicy<Status, internal::StatusTraits>;
  
  /// Keep retrying until some time has expired.
  using LimitedTimeRetryPolicy =
      google::cloud::internal::LimitedTimeRetryPolicy<Status,
                                                      internal::StatusTraits>;
  
  /// Keep retrying until the error count has been exceeded.
  using LimitedErrorCountRetryPolicy =
      google::cloud::internal::LimitedErrorCountRetryPolicy<
          Status, internal::StatusTraits>;
  
  /// The backoff policy base class.
  using BackoffPolicy = google::cloud::internal::BackoffPolicy;
  
  /// Implement truncated exponential backoff with randomization.
  using ExponentialBackoffPolicy =
      google::cloud::internal::ExponentialBackoffPolicy;
  
  }  // namespace STORAGE_CLIENT_NS
  }  // namespace storage
  }  // namespace cloud
  }  // namespace google
  
  #endif  // GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_STORAGE_RETRY_POLICY_H_
  