Jython API

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 can't interact with panels, modules, datafields, or anything like that (Not even message boxes)
• You don't 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 where Jython code can be executed from: When calling a PLANTA link web interface or when an event 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 dataitems where Virtuell = are loaded as attributes of the POJO and can be read or written, virtual dataitems don't 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 especially careful when you write logging messages that write out user input data and turn the entire message into an 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 to different places:
  • If the code is executed from an event the logging is written to the Event.log file
  • If the code is executed from a web interface the logging is written to 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 to both Event.log and the web interface log

import logging

logger = logging.getLogger(__name__)


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

This works with all packages that reside in the /jython/ folder, so both /customizing/ and /server/ packages can log, but also individual customer packages

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 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)

Server API

JythonServerAPI

Related topics

The API style guide can be found in the topic PythonApiStyleGuide