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// Copyright 2015 The Chromium OS 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 LIBBRILLO_BRILLO_DBUS_DBUS_SERVICE_WATCHER_H_
#define LIBBRILLO_BRILLO_DBUS_DBUS_SERVICE_WATCHER_H_
#include <string>
#include <base/callback.h>
#include <base/macros.h>
#include <base/memory/ref_counted.h>
#include <base/memory/weak_ptr.h>
#include <brillo/brillo_export.h>
#include <dbus/bus.h>
namespace brillo {
namespace dbus_utils {
// DBusServiceWatcher just asks the bus to notify us when the owner of a remote
// DBus connection transitions to the empty string. After registering a
// callback to be notified of name owner transitions, for the given
// |connection_name|, DBusServiceWatcher asks for the current owner. If at any
// point an empty string is found for the connection name owner,
// DBusServiceWatcher will call back to notify of the connection vanishing.
//
// The chief value of this class is that it manages the lifetime of the
// registered callback in the Bus, because failure to remove callbacks will
// cause the Bus to crash the process on destruction.
class BRILLO_EXPORT DBusServiceWatcher {
public:
DBusServiceWatcher(scoped_refptr<dbus::Bus> bus,
const std::string& connection_name,
const base::Closure& on_connection_vanish);
virtual ~DBusServiceWatcher();
virtual std::string connection_name() const { return connection_name_; }
private:
void OnServiceOwnerChange(const std::string& service_owner);
scoped_refptr<dbus::Bus> bus_;
const std::string connection_name_;
dbus::Bus::GetServiceOwnerCallback monitoring_callback_;
base::Closure on_connection_vanish_;
base::WeakPtrFactory<DBusServiceWatcher> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(DBusServiceWatcher);
};
} // namespace dbus_utils
} // namespace brillo
#endif // LIBBRILLO_BRILLO_DBUS_DBUS_SERVICE_WATCHER_H_
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