Jython API

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Information

• This topic describes the public Jython API of PLANTA
• These functions are guaranteed to be supported in future versions

Tip

• When you have enabled the planta link web services you can reload your jython code by saving in the module Web-Schnittstellen
• This invokes a clearing of the jython cache and resets the imported modules

Quickstart

Information

• The Jython code resides under <server folder>/jython
• The Jython version is 2.7, which can be quite different from 3.6 which you use in regular customizing
• The Jython interpreter is embedded in the Java part of the project Server instead of the native c part
• This means you have no access to the regular Python API (everything under <server folder>/py)
• Instead you have access to the Jython API (everything under <server folder>/jython), the Java API and small parts of the project Server Java API
• At the time of writing, there is no way to access the GUI from Jython, so you cannot interact with panels, modules, data fields, or the like (not even message boxes)
• You do not work with dtp or mts records, instead you operatore with the same POJOs (Plain Old Java Object) that the project Server works with
• Currently, there are 2 places from which Jython code can be executed: When calling a PLANTA link web interface (see Web-Schnittstellen in PLANTA link help area) or when an event (see Events in PLANTA customizing help area) with a Jython function is triggered

Introduction to working with POJOs

• Every table in project that has a valid Universally Unique IDentifier DI gets turned into a POJO
• The Entitätsbezeichnung determines the class name of the object
• The customizing.utilities package has all basic functions you need to interact with POJOs
• The object protection fields (Creation user, changed date, ...) are not set automatically, you have to manually call set_object_protection_fields from customizing.utilities when you want to set the object protection fields
• All data items where Virtuell = are loaded as attributes of the POJO and can be read or written, virtual data items do not exist in the POJO world

Working with unicode strings

• When you are working with data that is beyond the realm of plain ascii you need to use the Python 2.7 unicode string notation u'Exämple'
• You need to be particularly careful when you write logging messages that write out user input data and turn the entire message into a unicode string like this: logger.debug(u'Query: "{}"'.format(self.query))

Logging

You can use logging calls to debug your Jython code.

• Depending on what context the code is run in, the logging is written in different places:
• If the code is executed from an event, the logging is written in the Event.log file
• If the code is executed from a web interface, the logging is written in the web interface logging table and can be viewed in the PLANTA link web logging modules
• If a web interface performs an operation that triggers an event, the event log is written in both Event.log and the web interface log

import logging

logger = logging.getLogger(__name__)


def custom_event(event):
    logger.info('Custom event was called!')
    
    # ...

Customizing API

utilities

The utilities package provides various helper functions.

Tip

• Avoid importing any functions from their absolute namespace and instead use the utilities namespace
• This ensures that your code will stay compatible with future releases

# from customizing.utilities.database import db_select      Don't do this!
from customizing import utilities  # Do this!

utilities.db_select(query)

weblink

The weblink package implements the web interface framework for PLANTA link.

Tip

• Avoid importing any functions from their absolute namespace and instead use the weblink namespace
• This ensures your code will stay compatible with future releases

# from customizing.weblink.transformation.planta.base import Transformer      Don't do this!
from customizing import weblink  # Do this!

class MyTransformer(weblink.Transformer):
    ...

Server API

• Page:
  API Style Guide (PLANTA customizer)

  • pythonapistyleguide