sync/internal_api/public/engine/polling_constants.cc

   1 // Copyright (c) 2012 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 "base/basictypes.h"
   6 #include "sync/internal_api/public/engine/polling_constants.h"
   7
   8 namespace syncer {
   9
  10 // Server can overwrite these values via client commands.
  11 // Standard short poll. This is used when XMPP is off.
  12 // We use high values here to ensure that failure to receive poll updates from
  13 // the server doesn't result in rapid-fire polling from the client due to low
  14 // local limits.
  15 const int64 kDefaultShortPollIntervalSeconds = 3600 * 8;
  16 // Long poll is used when XMPP is on.
  17 const int64 kDefaultLongPollIntervalSeconds = 3600 * 12;
  18
  19 // Maximum interval for exponential backoff.
  20 const int64 kMaxBackoffSeconds = 60 * 60 * 4;  // 4 hours.
  21
  22 // Backoff interval randomization factor.
  23 const int kBackoffRandomizationFactor = 2;
  24
  25 // After a failure contacting sync servers, specifies how long to wait before
  26 // reattempting and entering exponential backoff if consecutive failures
  27 // occur.
  28 const int kInitialBackoffRetrySeconds = 60 * 5;  // 5 minutes.
  29
  30 // A dangerously short retry value that would not actually protect servers from
  31 // DDoS if it were used as a seed for exponential backoff, although the client
  32 // would still follow exponential backoff.  Useful for debugging and tests (when
  33 // you don't want to wait 5 minutes).
  34 const int kInitialBackoffShortRetrySeconds = 1;
  35
  36 // Similar to kInitialBackoffRetrySeconds above, but only to be used in
  37 // certain exceptional error cases, such as MIGRATION_DONE.
  38 const int kInitialBackoffImmediateRetrySeconds = 0;
  39
  40 }  // namespace syncer