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 #ifndef CHROME_BROWSER_SYNC_RETRY_VERIFIER_H_ 6 #define CHROME_BROWSER_SYNC_RETRY_VERIFIER_H_ 7 8 #include "base/time/time.h" 9 10 // TODO(akalin): Move this to somewhere in sync/ and make 11 // sync/engine/polling_constants.h private. 12 13 namespace syncer { 14 namespace sessions { 15 class SyncSessionSnapshot; 16 } // namespace sessions 17 } // namespace syncer 18 19 namespace browser_sync { 20 21 // The minimum and maximum wait times for a retry. The actual retry would take 22 // place somewhere in this range. The algorithm that calculates the retry wait 23 // time uses rand functions. 24 struct DelayInfo { 25 int64 min_delay; 26 int64 max_delay; 27 }; 28 29 // Class to verify retries take place using the exponential backoff algorithm. 30 class RetryVerifier { 31 public: 32 static const int kMaxRetry = 3; 33 RetryVerifier(); 34 ~RetryVerifier(); 35 int retry_count() const { return retry_count_; } 36 37 // Initialize with the current sync session snapshot. Using the snapshot 38 // we will figure out when the first retry sync happened. 39 void Initialize(const syncer::sessions::SyncSessionSnapshot& snap); 40 void VerifyRetryInterval( 41 const syncer::sessions::SyncSessionSnapshot& snap); 42 bool done() const { return done_; } 43 bool Succeeded() const { return done() && success_; } 44 45 private: 46 int retry_count_; 47 base::Time last_sync_time_; 48 DelayInfo delay_table_[kMaxRetry]; 49 bool success_; 50 bool done_; 51 DISALLOW_COPY_AND_ASSIGN(RetryVerifier); 52 }; 53 54 } // namespace browser_sync 55 56 #endif // CHROME_BROWSER_SYNC_RETRY_VERIFIER_H_ 57
