[Koha-bugs] [Bug 16365] New: Selectively introduce GetMarcStructure() "unsafe" variant for better performance

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=16365

            Bug ID: 16365
           Summary: Selectively introduce GetMarcStructure() "unsafe"
                    variant for better performance
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Architecture, internals, and plumbing
          Assignee: gmcharlt at gmail.com
          Reporter: abl at biblos.pk.edu.pl
        QA Contact: testopia at bugs.koha-community.org

GetMarcStructure() currently uses Koha::Cache in the "safe" mode (returning
deep copy of the result data structure by default), which causes numerous
performance issues in many Koha scripts. Switching it to the "unsafe" mode
globally (2nd patch from Bug 16140) resolves those issues, but ensuring that it
is regression-free (and that it will stay that way in the future) is far from
easy.

This patch proposes a bit more manageable solution, it introduces a possibility
to use "unsafe" variant selectively (only in those places in the code where
GetMarcStructure() is called repetively). That way, amount of the code that
needs to be audited for possible problems gets vastly reduced, without any
performance trade-offs.

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