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 com.aliyun.oss.common.comm;
  
  public abstract class RetryStrategy {
  
      private static final int DEFAULT_RETRY_PAUSE_SCALE = 300; // milliseconds.
  
      public abstract boolean shouldRetry(Exception ex, RequestMessage request, ResponseMessage response, int retries);
  
      public long getPauseDelay(int retries) {
          // make the pause time increase exponentially
          // based on an assumption that the more times it retries,
          // the less probability it succeeds.
          int scale = DEFAULT_RETRY_PAUSE_SCALE;
          long delay = (long) Math.pow(2, retries) * scale;
  
          return delay;
      }
  }
  