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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 COMPONENTS_VARIATIONS_VARIATIONS_REQUEST_SCHEDULER_H_
#define COMPONENTS_VARIATIONS_VARIATIONS_REQUEST_SCHEDULER_H_
#include "base/bind.h"
#include "base/gtest_prod_util.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
class PrefService;
namespace variations {
// A helper class that makes VariationsService requests at the correct times.
class VariationsRequestScheduler {
public:
virtual ~VariationsRequestScheduler();
// Starts the task. This can be a repeated event or a one-off.
virtual void Start();
// Resets the scheduler if it is currently on a timer.
virtual void Reset();
// Schedules a fetch shortly, for example to re-try the initial request which
// may have failed.
void ScheduleFetchShortly();
// Called when the application has been foregrounded. This may fetch a new
// seed.
virtual void OnAppEnterForeground();
// Factory method for this class.
static VariationsRequestScheduler* Create(const base::Closure& task,
PrefService* local_state);
protected:
// |task| is the closure to call when the scheduler deems ready.
explicit VariationsRequestScheduler(const base::Closure& task);
// Returns the time interval between variations seed fetches.
base::TimeDelta GetFetchPeriod() const;
// Getter for derived classes.
base::Closure task() const;
private:
FRIEND_TEST_ALL_PREFIXES(VariationsRequestSchedulerTest,
ScheduleFetchShortly);
// The task scheduled by this class.
base::Closure task_;
// The timer used to repeatedly ping the server. Keep this as an instance
// member so if VariationsRequestScheduler goes out of scope, the timer is
// automatically canceled.
base::RepeatingTimer timer_;
// A one-shot timer used for scheduling out-of-band fetches.
base::OneShotTimer one_shot_timer_;
DISALLOW_COPY_AND_ASSIGN(VariationsRequestScheduler);
};
} // namespace variations
#endif // COMPONENTS_VARIATIONS_VARIATIONS_REQUEST_SCHEDULER_H_
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