Takes a normal ROS callback channel and gives it an on demand query style interface. More...

Public Member Functions
def	__init__
	Message has to have a header.
def	read
	Supported use cases rfid - want to get a reading, can be stale, no duplication allowed (allow None), query speed important hokuyo - want to get a reading, can be stale, no duplication allowed (don't want a None), willing to wait for new data (default) ft - want to get a reading, can be stale, duplication allowed (don't want a None), query speed important NOT ALLOWED duplication allowed, willing to wait for new data.
Public Attributes
	curid
	delay_tolerance
	last_call_back
	last_msg_returned
	message_extractor
	node_name
	reading
Private Member Functions
def	_check_for_delivery_hiccups
def	_wait_for_first_read

Detailed Description

Takes a normal ROS callback channel and gives it an on demand query style interface.

Definition at line 292 of file pr2_utils.py.

Constructor & Destructor Documentation

def rcommander_pr2_gui.pr2_utils.GenericListener.__init__	(	self,
		node_name,
		message_type,
		listen_channel,
		frequency,
		message_extractor = `None`,
		queue_size = `None`
	)

Message has to have a header.

Parameters:

node_name	name of node (if haven't been inited)
message_type	type of message to listen for
listen_channel	ROS channel to listen
frequency	the frequency to expect messages (used to print warning statements to console)
message_extractor	function to preprocess the message into a desired format
queue_size	ROS subscriber queue (None = infinite)

Definition at line 301 of file pr2_utils.py.

Member Function Documentation

def rcommander_pr2_gui.pr2_utils.GenericListener._check_for_delivery_hiccups ( self ) [private]

Definition at line 349 of file pr2_utils.py.

def rcommander_pr2_gui.pr2_utils.GenericListener._wait_for_first_read	(	self,
		quiet = `False`
	)	`[private]`

Definition at line 358 of file pr2_utils.py.

def rcommander_pr2_gui.pr2_utils.GenericListener.read	(	self,
		allow_duplication = `False`,
		willing_to_wait = `True`,
		warn = `False`,
		quiet = `True`
	)

Supported use cases rfid - want to get a reading, can be stale, no duplication allowed (allow None), query speed important hokuyo - want to get a reading, can be stale, no duplication allowed (don't want a None), willing to wait for new data (default) ft - want to get a reading, can be stale, duplication allowed (don't want a None), query speed important NOT ALLOWED duplication allowed, willing to wait for new data.

Definition at line 372 of file pr2_utils.py.