Hi Lenya devs,
I came accross the following issue:
Currently, Lenya supports 3 types of meta data:
- LenyaMetaData
- DublinCore
- CustomMetaData
LenyaMetaData should be used for "internal" meta data.
The problem here is:
Which class is responsible to know the attribute names?
Actually IMO only the component which actually uses the meta
data should know the attribute name, and it should encapsulate
them. Otherwise we present an option for misuse:
String state = metaData.getFirstValue(LenyaMetaData.STATE);
This is bad code, because the syntax of the state storage
is known only by the workflow components. It should rather read
Workflowable workflowable = new DocumentWorkflowable(document...);
String state = workflowable.getLatestVersion().getState();
IMO the best way to deal with that is to allow component-specific
meta data, which requires a customizable set of meta data.
Or should we use the CustomMetaData for that purpose? Here I see
a danger of clashes due to the lack of further namespacing:
customMetaData.getFirstValue("state");
instead of
customMetaData.getFirstValue(Workflow.NAMESPACE, "state");
WDYT?
-- Andreas
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