Jerry Cwiklik created UIMA-5500:
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Summary: UIMA-AS V3: Replace dd2spring with java based DD
processing
Key: UIMA-5500
URL: https://issues.apache.org/jira/browse/UIMA-5500
Project: UIMA
Issue Type: Sub-task
Components: Async Scaleout
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Fix For: 3.0.0AS
Current UIMA-AS uses dd2spring to parse DD into intermediate format (Spring
Context) which is than fed into Spring Framework to instantiate components of
the UIMA-AS at runtime. The dd2spring uses saxon and custom xslt stylesheet to
process a DD. The xslt is quite complex and difficult to maintain. The saxon
library requires that the DD is provided as a fully qualified file preventing
from loading it from a classpath or datapath.
Instead of dd2spring, the UIMA-AS can use xmlbeans to parse the DD and
instantiate on object model representing it. There already exists a schema for
the DD in UIMA-AS from which an object model can be generated.
New java only code can than use the model to create components necessary to
deploy UIMA-AS service. The wiring of components will be done in java instead
of relying on Spring which hides much of this process.
The removal of dd2spring is largely an internal UIMA-AS concern and user code
impact of this change should be minimal. The user no longer will have to
specify Saxon nor the dd2springXsltFilePath when launching or deploying a
service.
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