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// Copyright (c) 2012 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_POLICY_CLOUD_POLICY_REFRESH_SCHEDULER_H_
#define CHROME_BROWSER_POLICY_CLOUD_POLICY_REFRESH_SCHEDULER_H_
#pragma once
#include <string>
#include "base/basictypes.h"
#include "base/cancelable_callback.h"
#include "base/memory/ref_counted.h"
#include "base/time.h"
#include "chrome/browser/policy/cloud_policy_client.h"
#include "chrome/browser/policy/cloud_policy_store.h"
#include "chrome/browser/prefs/pref_member.h"
#include "content/public/browser/notification_observer.h"
#include "net/base/network_change_notifier.h"
class PrefService;
namespace base {
class TaskRunner;
}
namespace policy {
// Observes CloudPolicyClient and CloudPolicyStore to trigger periodic policy
// fetches and issue retries on error conditions.
class CloudPolicyRefreshScheduler
: public CloudPolicyClient::Observer,
public CloudPolicyStore::Observer,
public content::NotificationObserver,
public net::NetworkChangeNotifier::IPAddressObserver {
public:
// Refresh constants.
static const int64 kUnmanagedRefreshDelayMs;
static const int64 kInitialErrorRetryDelayMs;
// Refresh delay bounds.
static const int64 kRefreshDelayMinMs;
static const int64 kRefreshDelayMaxMs;
// |client|, |store| and |prefs| pointers must stay valid throughout the
// lifetime of CloudPolicyRefreshScheduler.
CloudPolicyRefreshScheduler(
CloudPolicyClient* client,
CloudPolicyStore* store,
PrefService* prefs,
const std::string& refresh_pref,
const scoped_refptr<base::TaskRunner>& task_runner);
virtual ~CloudPolicyRefreshScheduler();
// CloudPolicyClient::Observer:
virtual void OnPolicyFetched(CloudPolicyClient* client) OVERRIDE;
virtual void OnRegistrationStateChanged(CloudPolicyClient* client) OVERRIDE;
virtual void OnClientError(CloudPolicyClient* client) OVERRIDE;
// CloudPolicyStore::Observer:
virtual void OnStoreLoaded(CloudPolicyStore* store) OVERRIDE;
virtual void OnStoreError(CloudPolicyStore* store) OVERRIDE;
// content::NotificationObserver:
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// net::NetworkChangeNotifier::IPAddressObserver:
virtual void OnIPAddressChanged() OVERRIDE;
private:
// Initializes |last_refresh_| to the policy timestamp from |store_| in case
// there is policy present that indicates this client is not managed. This
// results in policy fetches only to occur after the entire unmanaged refresh
// delay expires, even over restarts. For managed clients, we want to trigger
// a refresh on every restart.
void UpdateLastRefreshFromPolicy();
// Evaluates when the next refresh is pending and updates the callback to
// execute that refresh at the appropriate time.
void ScheduleRefresh();
// Triggers a policy refresh.
void PerformRefresh();
// Schedules a policy refresh to happen after |delta_ms| milliseconds,
// relative to |last_refresh_|.
void RefreshAfter(int delta_ms);
// Gets the refresh delay in milliseconds, clamped to the allowed bounds.
int64 GetRefreshDelay();
CloudPolicyClient* client_;
CloudPolicyStore* store_;
// For scheduling delayed tasks.
const scoped_refptr<base::TaskRunner> task_runner_;
// The delayed refresh callback.
base::CancelableClosure refresh_callback_;
// The last time a refresh callback completed.
base::Time last_refresh_;
// Error retry delay in milliseconds.
int64 error_retry_delay_ms_;
IntegerPrefMember refresh_delay_;
DISALLOW_COPY_AND_ASSIGN(CloudPolicyRefreshScheduler);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_CLOUD_POLICY_REFRESH_SCHEDULER_H_
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