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 "chrome/browser/sync/test/integration/updated_progress_marker_checker.h" 6 7 #include "chrome/browser/sync/profile_sync_service.h" 8 #include "sync/internal_api/public/sessions/sync_session_snapshot.h" 9 UpdatedProgressMarkerChecker(ProfileSyncService * service)10UpdatedProgressMarkerChecker::UpdatedProgressMarkerChecker( 11 ProfileSyncService* service) : SingleClientStatusChangeChecker(service) {} 12 ~UpdatedProgressMarkerChecker()13UpdatedProgressMarkerChecker::~UpdatedProgressMarkerChecker() {} 14 IsExitConditionSatisfied()15bool UpdatedProgressMarkerChecker::IsExitConditionSatisfied() { 16 // Checks to see if our self-notify sync cycle has completed and 17 // there's nothing to commit. 18 // 19 // If we assume that no one else is committing at this time and that the 20 // current client did not commit anything in its previous sync cycle, then 21 // this client has the latest progress markers. 22 // 23 // The !service()->HasUnsyncedItems() check makes sure that we have nothing to 24 // commit. 25 // 26 // There is a subtle race condition here. While committing items, the syncer 27 // will unset the IS_UNSYNCED bits in the directory. However, the evidence of 28 // this current sync cycle won't be available from GetLastSessionSnapshot() 29 // until the sync cycle completes. If we query this condition between the 30 // commit response processing and the end of the sync cycle, we could return a 31 // false positive. 32 // 33 // In practice, this doesn't happen very often because we only query the 34 // status when the waiting first starts and when we receive notification of a 35 // sync session complete or other significant event from the 36 // ProfileSyncService. If we're calling this right after the sync session 37 // completes, then the snapshot is much more likely to be up to date. 38 const syncer::sessions::SyncSessionSnapshot& snap = 39 service()->GetLastSessionSnapshot(); 40 return snap.model_neutral_state().num_successful_commits == 0 && 41 !service()->HasUnsyncedItems(); 42 } 43 GetDebugMessage() const44std::string UpdatedProgressMarkerChecker::GetDebugMessage() const { 45 return "Waiting for progress markers"; 46 } 47