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// Copyright 2020 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_CHROMEOS_DBUS_PRINTERS_SERVICE_PROVIDER_H_
#define CHROME_BROWSER_CHROMEOS_DBUS_PRINTERS_SERVICE_PROVIDER_H_
#include <string>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/scoped_observer.h"
#include "chrome/browser/chromeos/printing/cups_printers_manager.h"
#include "chrome/browser/chromeos/printing/cups_printers_manager_proxy.h"
#include "chromeos/dbus/services/cros_dbus_service.h"
#include "dbus/exported_object.h"
namespace chromeos {
// Provides a DBus service which emits a signal to indicate that the available
// printers has changed. Clients are intended to listen for the signal then
// make a request for more printers through a side channel e.g. cups_proxy.
class PrintersServiceProvider
: public CrosDBusService::ServiceProviderInterface,
public chromeos::CupsPrintersManager::Observer {
public:
PrintersServiceProvider();
~PrintersServiceProvider() override;
// CrosDBusService::ServiceProviderInterface overrides:
void Start(scoped_refptr<dbus::ExportedObject> exported_object) override;
// CupsPrintersManager::Observer overrides:
void OnPrintersChanged(PrinterClass printers_class,
const std::vector<Printer>& printers) override;
private:
// Emits the D-Bus signal for this event.
void EmitSignal();
// A reference on ExportedObject for sending signals.
scoped_refptr<dbus::ExportedObject> exported_object_;
ScopedObserver<chromeos::CupsPrintersManagerProxy,
chromeos::CupsPrintersManager::Observer>
printers_manager_observer_{this};
DISALLOW_COPY_AND_ASSIGN(PrintersServiceProvider);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_DBUS_PRINTERS_SERVICE_PROVIDER_H_