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https://jira.duraspace.org/browse/DS-1456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=28302#comment-28302
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Mark H. Wood commented on DS-1456:
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Nope, each UI has its own kernel. The only common pieces are the filesystem,
the database, and the container, and the container works hard to prevent
information leakage across Contexts. The only way I see for a UI to know it
can empty the table would be to start an exclusive transaction, then probe each
URL and remove any row that holds a non-responding URL. I think it's simpler
to just accept the possibility of stale data and test for freshness whenever we
need to know. Each registering component makes a best-effort to clean up after
itself at shutdown, but we cannot and so shall not rely on all rows
representing current running app.s. Deregistration is a convenience for other
app.s to avoid a little unnecessary work, not something we can guarantee. We
can make it fairly reliable by putting the (de)registration code in a
ContextListener, but if the container or the host crashes we have no recourse
and must depend on active verification.
> "dspace version" command-line script
> ------------------------------------
>
> Key: DS-1456
> URL: https://jira.duraspace.org/browse/DS-1456
> Project: DSpace
> Issue Type: New Feature
> Reporter: Ivan Masár
> Assignee: Mark H. Wood
> Fix For: 4.0
>
>
> We should provide a "[dspace]/bin/dspace version" script, which would gather
> the basic information about DSpace and its environment that is necessary to
> ask questions on dspace-tech.
> This information includes most prominently:
> * DSpace version
> * OS version
> * UI(s) used
> * is Discovery enabled?
> somewhat less often important:
> * JDK version
> * ant version
> * maven version
> * path to DSpace
> Optional flags could produce even more information, pulled from
> configuration, e.g. database configuration, hostname/URL configuration,
> authentication configuration (with passwords omited), etc.
> Most of this information is already available in the XMLUI admin Control
> panel, so some of those methods could be reused.
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