Net::DBus::Object

Section: User Contributed Perl Documentation (3)
Updated: 2021-01-27
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NAME

Net::DBus::Object - Implement objects to export to the bus

SYNOPSIS

  # Connecting an object to the bus, under a service
  package main;

  use Net::DBus;

  # Attach to the bus
  my $bus = Net::DBus->find;

  # Acquire a service 'org.demo.Hello'
  my $service = $bus->export_service("org.demo.Hello");

  # Export our object within the service
  my $object = Demo::HelloWorld->new($service);

  ....rest of program...

  # Define a new package for the object we're going
  # to export
  package Demo::HelloWorld;

  # Specify the main interface provided by our object
  use Net::DBus::Exporter qw(org.example.demo.Greeter);

  # We're going to be a DBus object
  use base qw(Net::DBus::Object);

  # Export a 'Greeting' signal taking a stringl string parameter
  dbus_signal("Greeting", ["string"]);

  # Export 'Hello' as a method accepting a single string
  # parameter, and returning a single string value
  dbus_method("Hello", ["string"], ["string"]);

  sub new {
      my $class = shift;
      my $service = shift;
      my $self = $class->SUPER::new($service, "/org/demo/HelloWorld");

      bless $self, $class;

      return $self;
  }

  sub Hello {
    my $self = shift;
    my $name = shift;

    $self->emit_signal("Greeting", "Hello $name");
    return "Said hello to $name";
  }

  # Export 'Goodbye' as a method accepting a single string
  # parameter, and returning a single string, but put it
  # in the 'org.exaple.demo.Farewell' interface

  dbus_method("Goodbye", ["string"], ["string"], "org.example.demo.Farewell");

  sub Goodbye {
    my $self = shift;
    my $name = shift;

    $self->emit_signal("Greeting", "Goodbye $name");
    return "Said goodbye to $name";
  }

DESCRIPTION

This the base for implementing objects which are directly exported to the bus. The methods implemented in a subclass are mapped to methods on the bus. By using this class, an application is directly tieing the RPC functionality into its object model. Applications may thus prefer to use the "Net::DBus::ProxyObject" class which allows the RPC functionality to be maintained separately from the core object model, by proxying RPC method calls.

METHODS

my $object = Net::DBus::Object->new($service, $path): This creates a new DBus object with an path of $path registered within the service $service. The $path parameter should be a string complying with the usual DBus requirements for object paths, while the $service parameter should be an instance of Net::DBus::Service. The latter is typically obtained by calling the "export_service" method on the Net::DBus object.
my $object = Net::DBus::Object->new($parentobj, $subpath): This creates a new DBus child object with an path of $subpath relative to its parent $parentobj. The $subpath parameter should be a string complying with the usual DBus requirements for object paths, while the $parentobj parameter should be an instance of Net::DBus::BaseObject or a subclass.

AUTHOR

Daniel P. Berrange

Net::DBus::Object

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