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// Copyright 2014 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_SIGNAL_H_
#define LIBBRILLO_BRILLO_DBUS_DBUS_SIGNAL_H_
#include <string>
#include <typeinfo>
#include <base/bind.h>
#include <base/macros.h>
#include <brillo/brillo_export.h>
#include <brillo/dbus/dbus_param_writer.h>
#include <dbus/message.h>
namespace brillo {
namespace dbus_utils {
class DBusObject;
// Base class for D-Bus signal proxy classes.
// Used mostly to store the polymorphic DBusSignal<...> in a single map
// container inside DBusInterface object.
class BRILLO_EXPORT DBusSignalBase {
public:
DBusSignalBase(DBusObject* dbus_object,
const std::string& interface_name,
const std::string& signal_name);
virtual ~DBusSignalBase() = default;
protected:
bool SendSignal(dbus::Signal* signal) const;
std::string interface_name_;
std::string signal_name_;
private:
DBusObject* dbus_object_;
DISALLOW_COPY_AND_ASSIGN(DBusSignalBase);
};
// DBusSignal<...> is a concrete signal proxy class that knows about the
// exact number of signal arguments and their types.
template<typename... Args>
class DBusSignal : public DBusSignalBase {
public:
// Expose the custom constructor from DBusSignalBase.
using DBusSignalBase::DBusSignalBase;
~DBusSignal() override = default;
// DBusSignal<...>::Send(...) dispatches the signal with the given arguments.
bool Send(const Args&... args) const {
dbus::Signal signal(interface_name_, signal_name_);
dbus::MessageWriter signal_writer(&signal);
DBusParamWriter::Append(&signal_writer, args...);
return SendSignal(&signal);
}
private:
DISALLOW_COPY_AND_ASSIGN(DBusSignal);
};
} // namespace dbus_utils
} // namespace brillo
#endif // LIBBRILLO_BRILLO_DBUS_DBUS_SIGNAL_H_
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