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https://issues.apache.org/jira/browse/UIMA-6200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17069463#comment-17069463
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Richard Eckart de Castilho commented on UIMA-6200:
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Here some numbers:
{code}
[13266] FixedFlowController parsed from XML in [10000]ms
[2964212] FixedFlowController parsed once, cached and cloned in [10000]ms
[35156776] FixedFlowController generated in memory in [10000]ms
{code}
The third option constructs a fresh object in memory on every invocation,
completely foregoing the XML file and also the cloning.
> Constructing aggregate engines is slow
> --------------------------------------
>
> Key: UIMA-6200
> URL: https://issues.apache.org/jira/browse/UIMA-6200
> Project: UIMA
> Issue Type: Bug
> Components: Core Java Framework
> Reporter: Richard Eckart de Castilho
> Priority: Minor
> Fix For: 2.10.5SDK
>
> Attachments: Screenshot 2020-03-15 at 18.52.48.png
>
>
> Creating an aggregate engine is slow because every time a default fixed flow
> descriptor is loaded from the classpath as XML and parsed.
> *FixedFlowController*
> {code}
> public static FlowControllerDescription getDescription() {
> URL descUrl = FixedFlowController.class
> .getResource("/org/apache/uima/flow/FixedFlowController.xml");
> FlowControllerDescription desc;
> try {
> desc = (FlowControllerDescription) UIMAFramework.getXMLParser().parse(
> new XMLInputSource(descUrl));
> } catch (InvalidXMLException e) {
> throw new UIMARuntimeException(e);
> } catch (IOException e) {
> throw new UIMARuntimeException(e);
> }
> return desc;
> }
> {code}
> IMHO, this should be loaded once and then cached permanently - or be
> constructed completely programmatically (also once!) and never loaded at all.
> !Screenshot 2020-03-15 at 18.52.48.png!
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