class DBus::ProxyObject

D-Bus proxy object class

Class representing a remote object in an external application. Typically, calling a method on an instance of a ProxyObject sends a message over the bus so that the method is executed remotely on the correctponding object.

Attributes

bus[R]

The bus the object is reachable via.

default_iface[RW]

@return [String] The name of the default interface of the object.

destination[R]

The (remote) destination of the object.

introspected[RW]

Flag determining whether the object has been introspected.

path[R]

The path to the object.

subnodes[RW]

The names of direct subnodes of the object in the tree.

Public Class Methods

new(bus, dest, path) click to toggle source

Creates a new proxy object living on the given bus at destination dest on the given path.

# File lib/dbus/introspect.rb, line 370
def initialize(bus, dest, path)
  @bus, @destination, @path = bus, dest, path
  @interfaces = Hash.new
  @subnodes = Array.new
end

Public Instance Methods

[](intfname) click to toggle source

Retrieves an interface of the proxy object @param [String] intfname @return [ProxyObjectInterface]

# File lib/dbus/introspect.rb, line 384
def [](intfname)
  @interfaces[intfname]
end
[]=(intfname, intf) click to toggle source

Maps the given interface name intfname to the given interface _intf. @param [String] intfname @param [ProxyObjectInterface] intf @return [ProxyObjectInterface]

# File lib/dbus/introspect.rb, line 392
def []=(intfname, intf)
  @interfaces[intfname] = intf
end
define_shortcut_methods() click to toggle source

For each non duplicated method name in any interface present on the caller, defines a shortcut method dynamically. This function is automatically called when a {ProxyObject} is introspected.

# File lib/dbus/introspect.rb, line 410
def define_shortcut_methods
  # builds a list of duplicated methods
  dup_meths, univocal_meths = [],{}
  @interfaces.each_value do |intf|
    intf.methods.each_value do |meth|
      # Module#instance_methods give us an array of symbols or strings,
      # depending on which version
      name = if RUBY_VERSION >= "1.9"
               meth.name.to_sym
             else
               meth.name
             end
      # don't overwrite instance methods!
      if dup_meths.include? name or self.class.instance_methods.include? name
        next
      elsif univocal_meths.include? name
        univocal_meths.delete name
        dup_meths << name
      else
        univocal_meths[name] = intf
      end
    end
  end
  univocal_meths.each do |name, intf|
    # creates a shortcut function that forwards each call to the method on
    # the appropriate intf
    singleton_class.class_eval do
      define_method name do |*args, &reply_handler|
        intf.method(name).call(*args, &reply_handler)
      end
    end
  end
end
has_iface?(name) click to toggle source

Returns whether the object has an interface with the given name.

# File lib/dbus/introspect.rb, line 445
def has_iface?(name)
  raise "Cannot call has_iface? if not introspected" if not @introspected
  @interfaces.member?(name)
end
interfaces() click to toggle source

Returns the interfaces of the object.

# File lib/dbus/introspect.rb, line 377
def interfaces
  @interfaces.keys
end
introspect() click to toggle source

Introspects the remote object. Allows you to find and select interfaces on the object.

# File lib/dbus/introspect.rb, line 398
def introspect
  # Synchronous call here.
  xml = @bus.introspect_data(@destination, @path)
  ProxyObjectFactory.introspect_into(self, xml)
  define_shortcut_methods()
  xml
end
on_signal(name, &block) click to toggle source

Registers a handler, the code block, for a signal with the given name. It uses default_iface which must have been set. @return [void]

# File lib/dbus/introspect.rb, line 453
def on_signal(name, &block)
  if @default_iface and has_iface?(@default_iface)
    @interfaces[@default_iface].on_signal(name, &block)
  else
    # TODO improve
    raise NoMethodError
  end
end

Private Instance Methods

method_missing(name, *args, &reply_handler) click to toggle source

Handles all unkown methods, mostly to route method calls to the default interface.

# File lib/dbus/introspect.rb, line 467
def method_missing(name, *args, &reply_handler)
  if @default_iface and has_iface?(@default_iface)
    begin
      @interfaces[@default_iface].method(name).call(*args, &reply_handler)
    rescue NameError => e
      # interesting, foo.method("unknown")
      # raises NameError, not NoMethodError
      raise unless e.to_s =~ /undefined method `#{name}'/
      # BTW e.exception("...") would preserve the class.
      raise NoMethodError,"undefined method `#{name}' for DBus interface `#{@default_iface}' on object `#{@path}'"
    end
  else
    # TODO distinguish:
    # - di not specified
    #TODO
    # - di is specified but not found in introspection data
    raise NoMethodError, "undefined method `#{name}' for DBus interface `#{@default_iface}' on object `#{@path}'"
  end
end
singleton_class() click to toggle source

Returns the singleton class of the object.

# File lib/dbus/introspect.rb, line 488
def singleton_class
  (class << self ; self ; end)
end