1 // Copyright (c) 2013 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_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_ 6 #define CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_ 7 8 #include "base/timer/timer.h" 9 10 namespace chrome_variations { 11 12 // This class manages synchronizing active VariationIDs with the Google Update 13 // experiment_labels value in the registry. 14 class VariationsRegistrySyncer { 15 public: 16 VariationsRegistrySyncer(); 17 ~VariationsRegistrySyncer(); 18 19 // Starts a timer that, when it expires, updates the registry with the current 20 // Variations associated with Google Update. If the timer is already running, 21 // calling this just resets the timer. 22 void RequestRegistrySync(); 23 24 private: 25 // Perform the actual synchronization process with the registry. 26 void SyncWithRegistry(); 27 28 // A timer used to delay the writes to the registry. This is done to optimize 29 // the case where lazy-loaded features start their field trials some time 30 // after initial batch of field trials are created, and also to avoid blocking 31 // the UI thread. The timer effectively allows this class to batch together 32 // update requests, to avoid reading and writing from the registry too much. 33 base::OneShotTimer<VariationsRegistrySyncer> timer_; 34 35 DISALLOW_COPY_AND_ASSIGN(VariationsRegistrySyncer); 36 }; 37 38 } // namespace chrome_variations 39 40 #endif // CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_ 41
