content: /*
   * Copyright (C) 2011 The Android Open Source Project
   *
   * 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.
   */
  
  package com.cjj.volley;
  
  /**
   * Default retry policy for requests.
   */
  public class DefaultRetryPolicy implements RetryPolicy {
      /** The current timeout in milliseconds. */
      private int mCurrentTimeoutMs;
  
      /** The current retry count. */
      private int mCurrentRetryCount;
  
      /** The maximum number of attempts. */
      private final int mMaxNumRetries;
  
      /** The backoff multiplier for for the policy. */
      private final float mBackoffMultiplier;
  
      /** The default socket timeout in milliseconds */
      public static final int DEFAULT_TIMEOUT_MS = 2500;
  
      /** The default number of retries */
      public static final int DEFAULT_MAX_RETRIES = 1;
  
      /** The default backoff multiplier */
      public static final float DEFAULT_BACKOFF_MULT = 1f;
  
      /**
       * Constructs a new retry policy using the default timeouts.
       */
      public DefaultRetryPolicy() {
          this(DEFAULT_TIMEOUT_MS, DEFAULT_MAX_RETRIES, DEFAULT_BACKOFF_MULT);
      }
  
      /**
       * Constructs a new retry policy.
       * @param initialTimeoutMs The initial timeout for the policy.
       * @param maxNumRetries The maximum number of retries.
       * @param backoffMultiplier Backoff multiplier for the policy.
       */
      public DefaultRetryPolicy(int initialTimeoutMs, int maxNumRetries, float backoffMultiplier) {
          mCurrentTimeoutMs = initialTimeoutMs;
          mMaxNumRetries = maxNumRetries;
          mBackoffMultiplier = backoffMultiplier;
      }
  
      /**
       * Returns the current timeout.
       */
      @Override
      public int getCurrentTimeout() {
          return mCurrentTimeoutMs;
      }
  
      /**
       * Returns the current retry count.
       */
      @Override
      public int getCurrentRetryCount() {
          return mCurrentRetryCount;
      }
  
      /**
       * Prepares for the next retry by applying a backoff to the timeout.
       * @param error The error code of the last attempt.
       */
      @Override
      public void retry(VolleyError error) throws VolleyError {
          mCurrentRetryCount++;
          mCurrentTimeoutMs += (mCurrentTimeoutMs * mBackoffMultiplier);
          if (!hasAttemptRemaining()) {
              throw error;
          }
      }
  
      /**
       * Returns true if this policy has attempts remaining, false otherwise.
       */
      protected boolean hasAttemptRemaining() {
          return mCurrentRetryCount <= mMaxNumRetries;
      }
  }
  