components/gcm_driver/gcm_backoff_policy.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/gcm_driver/gcm_backoff_policy.h"
   6
   7 namespace gcm {
   8
   9 namespace {
  10
  11 // Backoff policy. Shared across GCM requests.
  12 // Note: In order to ensure a minimum of 20 seconds between server errors (for
  13 // server reasons), we have a 30s +- 10s (33%) jitter initial backoff.
  14 const net::BackoffEntry::Policy kDefaultBackoffPolicy = {
  15   // Number of initial errors (in sequence) to ignore before applying
  16   // exponential back-off rules.
  17   0,
  18
  19   // Initial delay for exponential back-off in ms.
  20   30 * 1000,  // 30 seconds.
  21
  22   // Factor by which the waiting time will be multiplied.
  23   2,
  24
  25   // Fuzzing percentage. ex: 10% will spread requests randomly
  26   // between 90%-100% of the calculated time.
  27   0.33,  // 33%.
  28
  29   // Maximum amount of time we are willing to delay our request in ms.
  30   10 * 60 * 1000, // 10 minutes.
  31
  32   // Time to keep an entry from being discarded even when it
  33   // has no significant state, -1 to never discard.
  34   -1,
  35
  36   // Don't use initial delay unless the last request was an error.
  37   false,
  38 };
  39
  40 }  // namespace
  41
  42 const net::BackoffEntry::Policy& GetGCMBackoffPolicy() {
  43   return kDefaultBackoffPolicy;
  44 }
  45
  46 }  // namespace gcm