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<?xml version="1.0"?>
<!--
###################################################
##Variable function probe
###################################################
-->
<block>
<name>Function Probe</name>
<key>variable_function_probe</key>
<import>import time</import>
<import>import threading</import>
<var_make>self.$(id) = $(id) = $value</var_make>
<make>#slurp
def _$(id)_probe():
while True:
val = self.$(block_id()).$(function_name())($(function_args()))
try: self.set_$(id)(val)
except AttributeError, e: pass
time.sleep(1.0/($poll_rate))
_$(id)_thread = threading.Thread(target=_$(id)_probe)
_$(id)_thread.daemon = True
_$(id)_thread.start()</make>
<callback>self.set_$(id)($value)</callback>
<param>
<name>Value</name>
<key>value</key>
<value>0</value>
<type>raw</type>
</param>
<param>
<name>Block ID</name>
<key>block_id</key>
<value>my_block_0</value>
<type>string</type>
</param>
<param>
<name>Function Name</name>
<key>function_name</key>
<value>get_number</value>
<type>string</type>
</param>
<param>
<name>Function Args</name>
<key>function_args</key>
<value></value>
<type>string</type>
<hide>#if $function_args() then 'none' else 'part'#</hide>
</param>
<param>
<name>Poll Rate (Hz)</name>
<key>poll_rate</key>
<value>10</value>
<type>real</type>
</param>
<doc>
Periodically probe a function and set its value to this variable.
Set the values for block ID, function name, and function args appropriately: \
Block ID should be the ID of another block in this flow graph. \
Function name should be the name of a class method on that block. \
Function args are the parameters passed into that function. \
For a function with no arguments, leave function args blank. \
When passing a string for the function arguments, quote the string literal: '"arg"'.
The values will used literally, and generated into the following form:
self.block_id.function_name(function_args)
To poll a stream for a level, use this with the probe signal block.
</doc>
</block>
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