gecko-dev/ipc/dbus/DBusUtils.h

/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/*
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

#ifndef mozilla_ipc_dbus_dbusutils_h__
#define mozilla_ipc_dbus_dbusutils_h__

#include <dbus/dbus.h>
#include "mozilla/RefPtr.h"
#include "nsISupportsImpl.h"

// LOGE and free a D-Bus error
// Using #define so that __FUNCTION__ resolves usefully
#define LOG_AND_FREE_DBUS_ERROR_WITH_MSG(err, msg) log_and_free_dbus_error(err, __FUNCTION__, msg);
#define LOG_AND_FREE_DBUS_ERROR(err) log_and_free_dbus_error(err, __FUNCTION__);

namespace mozilla {
namespace ipc {

class DBusMessageRefPtr
{
public:
  explicit DBusMessageRefPtr(DBusMessage* aMsg);
  ~DBusMessageRefPtr();

  operator DBusMessage* ()
  {
    return mMsg;
  }

  DBusMessage* get()
  {
    return mMsg;
  }

private:
  DBusMessage* mMsg;
};

/**
 * DBusReplyHandler represents a handler for DBus reply messages. Inherit
 * from this class and implement the Handle method. The method Callback
 * should be passed to the DBus send function, with the class instance as
 * user-data argument.
 */
class DBusReplyHandler
{
public:
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DBusReplyHandler)

  /**
   * Implements a call-back function for DBus. The supplied value for
   * aData must be a pointer to an instance of DBusReplyHandler.
   */
  static void Callback(DBusMessage* aReply, void* aData);

  /**
   * Call-back method for handling the reply message from DBus.
   */
  virtual void Handle(DBusMessage* aReply) = 0;

protected:
  DBusReplyHandler()
  {
  }

  DBusReplyHandler(const DBusReplyHandler& aHandler)
  {
  }

  DBusReplyHandler& operator = (const DBusReplyHandler& aRhs)
  {
    return *this;
  }

  virtual ~DBusReplyHandler()
  {
  }
};

void log_and_free_dbus_error(DBusError* err,
                             const char* function,
                             DBusMessage* msg = nullptr);

int dbus_returns_int32(DBusMessage *reply);

}
}

#endif