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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_
#define CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_
#include "base/macros.h"
#include "base/timer/timer.h"
namespace chrome_variations {
// This class manages synchronizing active VariationIDs with the Google Update
// experiment_labels value in the registry.
class VariationsRegistrySyncer {
public:
VariationsRegistrySyncer();
~VariationsRegistrySyncer();
// Starts a timer that, when it expires, updates the registry with the current
// Variations associated with Google Update. If the timer is already running,
// calling this just resets the timer.
void RequestRegistrySync();
private:
// Starts the actual synchronization process with the registry. Posts a task
// to do it on the blocking pool to avoid jank.
void StartRegistrySync();
// A timer used to delay the writes to the registry. This is done to optimize
// the case where lazy-loaded features start their field trials some time
// after initial batch of field trials are created, and also to avoid blocking
// the UI thread. The timer effectively allows this class to batch together
// update requests, to avoid reading and writing from the registry too much.
base::OneShotTimer timer_;
DISALLOW_COPY_AND_ASSIGN(VariationsRegistrySyncer);
};
} // namespace chrome_variations
#endif // CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_
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