Transcript Python Components

Atacama
Large
Millimeter
Array
ACS Training
Developing Python Components
What’s Available in Python?
Python implementation of the Component IDL interface
• May implement IDL interfaces derived from
ACS::ACSComponent
• May not implement IDL interfaces derived from
ACS::CharacteristicComponent
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Example
#ifndef _ACSCOURSE_MOUNT_IDL_
#define _ACSCOURSE_MOUNT_IDL_
ACSCOURSE_MOUNT__POA
ACSCOURSE_MOUNTImpl/Mount1.py
IDL
#include <baci.idl> /* <acscomponent.idl> */
#pragma prefix "alma"
Py CORBA Stubs
Developer
module ACSCOURSE_MOUNT {
interface Mount1 : ACS::ACSComponent {
/* (Pre)sets a new non-moving position for the antenna.
* @param az
position azimuth (degree)
* @param elev
position elevation (degree) */
void objfix (in double az, in double elev);
};
};
#endif
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Example (continued)
#--CORBA STUBS-------------------------------------------------------import ACSCOURSE_MOUNT__POA
#--ACS Imports-------------------------------------------------------from Acspy.Servants.ContainerServices import ContainerServices
from Acspy.Servants.ComponentLifecycle import ComponentLifecycle
from Acspy.Servants.ACSComponent
import ACSComponent
class Mount1(ACSCOURSE_MOUNT__POA.Mount1, #CORBA stubs for IDL Int.
ACSComponent, #Base IDL interface
ContainerServices, #Developer niceties
ComponentLifecycle): #HLA stuff
def __init__(self):
'''Just call superclass constructors here.'''
ACSComponent.__init__(self)
ContainerServices.__init__(self)
return
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Example (continued)
#-----------------------------------------------------------#--Override ComponentLifecycle methods----------------------#-----------------------------------------------------------def initialize(self):
'''
Override this method inherited from ComponentLifecycle
'''
self.getLogger().logInfo("Not much to see here!")
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Example (continued)
#----------------------------------------------------------------#--Implementation of IDL methods---------------------------------#-----------------------------------------------------------------def objfix(self, az, el):
'''Python implementation of IDL method'''
self.getLogger().logInfo("objfix called with az="+str(az)+
" and el="+str(el))
#---------------------------------------------------------------------#--Main defined only for generic testing------------------------------#---------------------------------------------------------------------if __name__ == "__main__":
print "Creating an object"
g = Mount1()
print "Done..."
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What methods does
ACSComponent have?
In general, many methods are provided but
only a couple should ever be invoked by your
code.
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What methods does
ContainerServices have?
Too many to cover in the short time given for
this presentation!
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What methods does
ComponentLifecycle have?
The same as Java although they’re nicer to
work with in Python because we’re not
limited to single inheritance. Descriptions of
these methods can be found here.
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Python-related Makefile Targets
• PY_SCRIPTS - Specifies Python scripts without the .py extension that
will be installed into $INTROOT/bin.
• PY_MODULES – Specifies Python modules with the .py extension
that will be installed into $INTROOT/lib/python/site-packages.
• PY_PACKAGES – Specifies Python packages to be installed into
$INTROOT/lib/python/site-packages. Really these are just directories
containing Python scripts.
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CDB entry
< _ Name="MOUNT_PY_1“
Code="ACSCOURSE_MOUNTImpl.Mount1"
Type="IDL:alma/ACSCOURSE_MOUNT/Mount1:1.0"
Container="mountPython"
/>
Package.module
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Questions about Python Servants???
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Demo
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