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annotate doc/implementation.txt @ 6610:db3f0ba75b4a

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Change checkpoint_data and restore_connection_on_error to subtransaction checkpoint_data and restore_connection_on_error used to commit() and rollback() the db connection. This causes additional I/O and load. Changed them to use 'SAVEPOINT name' and 'ROLLBACK TO name' to get a faster method for handling errors within a tranaction. One thing to note is that postgresql (unlike SQL std) doesn't overwrite an older savepoint with he same name. It keeps all savepoints but only rolls back to the newest one with a given name. This could be a resource issue. I left a commented out release statement in case somebody runs into an issue due to too many savepoints. I expect it to slow down the import but....
author John Rouillard <rouilj@ieee.org>
date Sat, 29 Jan 2022 11:29:36 -0500
parents 33a1f03b9de0
children 9ca128103a3a
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1 ====================
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2 Implementation notes
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3 ====================
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5 [see also the roundup package docstring]
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7 There have been some modifications to the spec. I've marked these in the
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8 source with 'XXX' comments when I remember to.
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10 In short:
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11 Class.find() - may match multiple properties, uses keyword args.
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13 Class.filter() - isn't in the spec and it's very useful to have at the
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14 Class level.
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16 CGI interface index view specifier layout part - lose the '+' from the
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17 sorting arguments (it's a reserved URL character ;). Just made no
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18 prefix mean ascending and '-' prefix descending.
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20 ItemClass - renamed to IssueClass to better match it only having one
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21 hypderdb class "issue". Allowing > 1 hyperdb class breaks the
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22 "superseder" multilink (since it can only link to one thing, and
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23 we'd want bugs to link to support and vice-versa).
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25 template - the call="link()" is handled by special-case mechanisms in
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26 my top-level CGI handler. In a nutshell, the handler looks for a
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27 method on itself called 'index%s' or 'item%s' where %s is a class.
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28 Most items pass on to the templating mechanism, but the file class
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29 _always_ does downloading. It'll probably stay this way too...
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43ab730ee194 instance -> tracker, node -> item
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31 template - call="link(property)" may be used to link "the current item"
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32 (from an index) - the link text is the property specified.
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34 template - added functions that I found very useful: List, History and
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35 Submit.
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37 template - items must specify the message lists, history, etc. Having
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38 them by default was sometimes not wanted.
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40 template - index view determines its default columns from the
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41 template's ``tal:condition="request/show/<property>"`` directives.
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43 template - menu() and field() look awfully similar now .... ;)
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45 roundup_admin.py - the command-line tool has a lot more commands at its
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46 disposal
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48 -----------------
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50 Back to `Table of Contents`_
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52 .. _`Table of Contents`: index.html
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53
Roundup Issue Tracker: http://roundup-tracker.org/