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// Copyright (c) 2011 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_ASYNCHRONOUS_POLICY_LOADER_H_
#define CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_LOADER_H_
#pragma once
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "base/time.h"
#include "base/values.h"
#include "chrome/browser/policy/asynchronous_policy_provider.h"
#include "chrome/browser/policy/configuration_policy_provider.h"
class CancelableTask;
class MessageLoop;
namespace policy {
// Used by the implementation of asynchronous policy provider to manage the
// tasks on the file thread that do the heavy lifting of loading policies.
class AsynchronousPolicyLoader
: public base::RefCountedThreadSafe<AsynchronousPolicyLoader> {
public:
AsynchronousPolicyLoader(AsynchronousPolicyProvider::Delegate* delegate,
int reload_interval_minutes);
// Triggers initial policy load.
virtual void Init();
// Reloads policy, sending notification of changes if necessary. Must be
// called on the file thread.
virtual void Reload();
// Stops any pending reload tasks.
virtual void Stop();
void AddObserver(ConfigurationPolicyProvider::Observer* observer);
void RemoveObserver(ConfigurationPolicyProvider::Observer* observer);
const DictionaryValue* policy() const { return policy_.get(); }
protected:
friend class UpdatePolicyTask;
// AsynchronousPolicyLoader objects should only be deleted by
// RefCountedThreadSafe.
friend class base::RefCountedThreadSafe<AsynchronousPolicyLoader>;
virtual ~AsynchronousPolicyLoader();
// Schedules a call to UpdatePolicy on |origin_loop_|. Takes ownership of
// |new_policy|.
void PostUpdatePolicyTask(DictionaryValue* new_policy);
AsynchronousPolicyProvider::Delegate* delegate() {
return delegate_.get();
}
// Performs start operations that must be performed on the file thread.
virtual void InitOnFileThread();
// Performs stop operations that must be performed on the file thread.
virtual void StopOnFileThread();
// Schedules a reload task to run when |delay| expires. Must be called on the
// file thread.
void ScheduleReloadTask(const base::TimeDelta& delay);
// Schedules a reload task to run after the number of minutes specified
// in |reload_interval_minutes_|. Must be called on the file thread.
void ScheduleFallbackReloadTask();
void CancelReloadTask();
// Invoked from the reload task on the file thread.
void ReloadFromTask();
private:
friend class AsynchronousPolicyLoaderTest;
// Finishes loader initialization after the threading system has been fully
// intialized.
void InitAfterFileThreadAvailable();
// Replaces the existing policy to value map with a new one, sending
// notification to the observers if there is a policy change. Must be called
// on |origin_loop_| so that it's safe to call back into the provider, which
// is not thread-safe. Takes ownership of |new_policy|.
void UpdatePolicy(DictionaryValue* new_policy);
// Provides the low-level mechanics for loading policy.
scoped_ptr<AsynchronousPolicyProvider::Delegate> delegate_;
// Current policy.
scoped_ptr<DictionaryValue> policy_;
// The reload task. Access only on the file thread. Holds a reference to the
// currently posted task, so we can cancel and repost it if necessary.
CancelableTask* reload_task_;
// The interval at which a policy reload will be triggered as a fallback.
const base::TimeDelta reload_interval_;
// The message loop on which this object was constructed. Recorded so that
// it's possible to call back into the non thread safe provider to fire the
// notification.
MessageLoop* origin_loop_;
// True if Stop has been called.
bool stopped_;
ObserverList<ConfigurationPolicyProvider::Observer, true> observer_list_;
DISALLOW_COPY_AND_ASSIGN(AsynchronousPolicyLoader);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_LOADER_H_
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