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 41