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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_ASYNCHRONOUS_POLICY_LOADER_H_
#define CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_LOADER_H_
#pragma once
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time.h"
#include "chrome/browser/policy/asynchronous_policy_provider.h"
class MessageLoop;
namespace policy {
class PolicyBundle;
// 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:
// The type of the callback passed to Init().
typedef base::Callback<void(scoped_ptr<PolicyBundle>)> UpdateCallback;
AsynchronousPolicyLoader(AsynchronousPolicyProvider::Delegate* delegate,
int reload_interval_minutes);
// Triggers initial policy load, and installs |callback| as the callback to
// invoke on policy updates. |callback| takes ownership of the passed
// PolicyBundle, which contains all the policies that were loaded.
virtual void Init(const UpdateCallback& callback);
// Reloads policy, sending notification of changes if necessary. Must be
// called on the FILE thread. When |force| is true, the loader should do an
// immediate full reload.
virtual void Reload(bool force);
// Stops any pending reload tasks. Updates callbacks won't be performed
// anymore once the loader is stopped.
virtual void Stop();
protected:
// AsynchronousPolicyLoader objects should only be deleted by
// RefCountedThreadSafe.
friend class base::RefCountedThreadSafe<AsynchronousPolicyLoader>;
virtual ~AsynchronousPolicyLoader();
// Schedules a call to UpdatePolicy on |origin_loop_|.
void PostUpdatePolicyTask(scoped_ptr<PolicyBundle> bundle);
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();
// Invokes the |update_callback_| with a new PolicyBundle that maps
// the chrome namespace to |policy|. Must be called on |origin_loop_| so that
// it's safe to invoke |update_callback_|.
void UpdatePolicy(scoped_ptr<PolicyBundle> policy);
// Provides the low-level mechanics for loading policy.
scoped_ptr<AsynchronousPolicyProvider::Delegate> delegate_;
// Used to create and invalidate WeakPtrs on the FILE thread. These are only
// used to post reload tasks that can be cancelled.
base::WeakPtrFactory<AsynchronousPolicyLoader> weak_ptr_factory_;
// 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_;
// Callback to invoke on policy updates.
UpdateCallback update_callback_;
DISALLOW_COPY_AND_ASSIGN(AsynchronousPolicyLoader);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_LOADER_H_
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