TransformationPlugin is a class wrapping the supported transformation plugins

New plugins can be created by defining a function. The function name has to be _MyPlugin, and the plugin is then call 'MyPlugin'. Do not forget to enable new plugins in the Operations/Transformation/AllowedPlugins list. The return value of the function has to be S_OK with a list of tuples. Each Tuple is a pair of a StorageElement and list of LFNs to treat in given task:

return S_OK([('SE_1', [lfn_1_1, lfn_1_2, ...]),
             ('SE_1', [lfn_2_1, lfn_2_2, ...]),
             # ...
             ('SE_I', [lfn_J_1, lfn_J_2, ...]),

Inside the plugin function, the relevant LFNs can be accessed in the dictionary, and transformation parameters are obtained contained in the self.params dictionary. See also the PluginUtilities class.

class DIRAC.TransformationSystem.Agent.TransformationPlugin.TransformationPlugin(plugin, transClient=None, dataManager=None, fc=None)

Bases: PluginBase

A TransformationPlugin object should be instantiated by every transformation.

  • plugin (str) – A plugin name has to be passed in: it will then be executed as one of the functions below, e.g. plugin = ‘BySize’ will execute TransformationPlugin(‘BySize’)._BySize()

  • transClient – TransformationManagerClient instance

  • dataManager – DataManager instance

  • fc – FileCatalog instance

__init__(plugin, transClient=None, dataManager=None, fc=None)

Constructor of the TransformationPlugin.

Instantiate clients, if not given, and set up the PluginUtilities.


Check if all information is present


this is a wrapper to invoke the plugin (self._%s()” % self.plugin)


Set the replica information as data member


Need to pass parameters also to self.util


Set the TS files as data member