emit signal obj ?peer args emits signal from obj. The destinations of the signal are selected as follow:

• if peer is provided, then the message is sent only to it
• otherwise, if the the object has an owner, it is sent to the owner,
• otherwise, the message is broadcasted on all the connections obj is exported on.

Type of a signal descriptor. A signal descriptor represent the source of a signal and describes how the value should be transformed.

make signal proxy creates a signal descriptor.

make_any signal peer creates a signal descriptor for receiving signals from any object of peer.

connect ?switch sd connects the signal descriptor sd and returns the event which occurs when the given D-Bus signal is received.

map_event f sd transforms with f the event that is created when sd is connected.

Simplified version of map_event.

Same as map but the mapping function also receive the context.

• returns

  a signal descriptor that returns contexts in which signals are received.

with_filters filters sd is the signal descriptor sd with the given list of argument filters. When connected, obus will add this filters to the matching rule send to the message bus, so the bus can use them to drop messages that do not match these filters.

The goal of argument filters is to reduce the number of messages received, and so to reduce the number of wakeup of the program.

Note that match rule management must be activated for filters to take effect (see with_match_rule).

with_match_rule state sd enables or disables the automatic management of matching rules. If the endpoint of the underlying connection is a message bus it defaults to true, otherwise it default to false.