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 |
Takes a normal ROS callback channel and gives it an on demand query style interface.
| def hrl_lib.rutils.GenericListener.__init__ | ( | self, | |
| node_name, | |||
| message_type, | |||
| listen_channel, | |||
| frequency, | |||
message_extractor = None, |
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queue_size = None |
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| ) |
Message has to have a header.
| 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) |
| def hrl_lib.rutils.GenericListener._check_for_delivery_hiccups | ( | self | ) | [private] |
| def hrl_lib.rutils.GenericListener._wait_for_first_read | ( | self, | |
quiet = False |
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| ) | [private] |
| def hrl_lib.rutils.GenericListener.read | ( | self, | |
allow_duplication = False, |
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willing_to_wait = True, |
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warn = False, |
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quiet = True |
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| ) |
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.