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// Copyright (c) 2006-2008 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_COMMON_NOTIFICATION_REGISTRAR_H_
#define CHROME_COMMON_NOTIFICATION_REGISTRAR_H_
#include <vector>
#include "base/basictypes.h"
#include "base/platform_thread.h"
#include "chrome/common/notification_observer.h"
// Aids in registering for notifications and ensures that all registered
// notifications are unregistered when the class is destroyed.
//
// The intended use is that you make a NotificationRegistrar member in your
// class and use it to register your notifications instead of going through the
// notification service directly. It will automatically unregister them for
// you.
class NotificationRegistrar {
public:
// This class must not be derived from (we don't have a virtual destructor so
// it won't work). Instead, use it as a member in your class.
NotificationRegistrar();
~NotificationRegistrar();
// Wrappers around NotificationService::[Add|Remove]Observer.
void Add(NotificationObserver* observer,
NotificationType type,
const NotificationSource& source);
void Remove(NotificationObserver* observer,
NotificationType type,
const NotificationSource& source);
// Unregisters all notifications.
void RemoveAll();
// Returns true if no notifications are registered.
bool IsEmpty() const;
private:
static void CheckCalledOnValidThread(PlatformThreadId thread_id);
struct Record;
// We keep registered notifications in a simple vector. This means we'll do
// brute-force searches when removing them individually, but individual
// removal is uncommon, and there will typically only be a couple of
// notifications anyway.
typedef std::vector<Record> RecordVector;
// Lists all notifications we're currently registered for.
RecordVector registered_;
DISALLOW_COPY_AND_ASSIGN(NotificationRegistrar);
};
#endif // CHROME_COMMON_NOTIFICATION_REGISTRAR_H_
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