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https://issues.apache.org/jira/browse/UIMA-5842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554245#comment-16554245
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Marshall Schor edited comment on UIMA-5842 at 7/24/18 1:33 PM:
---------------------------------------------------------------
Some thoughts on how this might be implemented.
There are many ways to modify a CAS: create or update FeatureStructures (FSs)
, add/remove FSs to indexes, create views, reset, replace a type system (done
by cas complete deserialization), get/return a CAS to/from a CasPool. Others?
* This mode might be set for any / all of these categories.
One task is finding (hopefully a few) points in the code base where to insert
an "isAllowed" test.
Consideration for that test:
* (simplest) a CAS boolean field. (problem: multiple threads won't see
consistent view)
* volatile CAS boolean field (problem: each read forces a read-from-memory -
potentially slow)
* use a MutableCallSite to return the is-allowed value, using the "syncAll"
method when changing it to make values visible in other threads. This seems
the best (so far).
was (Author: schor):
Some thoughts on how this might be implemented.
There are many ways to modify a CAS: create or update FeatureStructures (FSs)
, add/remove FSs to indexes, create views, reset, replace a type system (done
by cas complete deserialization). Others?
* This mode might be set for any / all of these categories.
One task is finding (hopefully a few) points in the code base where to insert
an "isAllowed" test.
Consideration for that test:
* (simplest) a CAS boolean field. (problem: multiple threads won't see
consistent view)
* volatile CAS boolean field (problem: each read forces a read-from-memory -
potentially slow)
* use a MutableCallSite to return the is-allowed value, using the "syncAll"
method when changing it to make values visible in other threads. This seems
the best (so far).
> No-access, Read-only-access modes for a CAS
> -------------------------------------------
>
> Key: UIMA-5842
> URL: https://issues.apache.org/jira/browse/UIMA-5842
> Project: UIMA
> Issue Type: Wish
> Components: Core Java Framework
> Reporter: Marshall Schor
> Priority: Minor
>
> This Jira refs UIMA-5763 having motivation and discussion for no-access and
> read-only-access flags for a CAS. UIMA-5763 is rescoped to its original
> title, specific to releasing CASes.
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