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Annotation of /lib/A3C.pod

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Revision 207 - (hide annotations)
Thu Jun 19 19:52:43 2008 UTC (11 years, 11 months ago) by dpavlin
File size: 5580 byte(s)
describe models and more things to do...
1 dpavlin 204 =head1 NAME
3     A3C = AAAC; AAA from "Authentication, Authorization and Accounting" and C from "CARNet".
5     =head1 DESCRIPTION
7 dpavlin 205 This page describes general idea about A3C application and current status of implementation.
8 dpavlin 204
9 dpavlin 205 Oppinions should be attributed to Dobrica Pavlinusic, and not other developers :-)
10     It's surposed to convey a story which is coherent enough for new developer
11     to join into project. Most of other documentation is more useful when
12     developing and looking into code usage (if it's not documented and tested,
13     it doesn't exist) but this part is delivered as pure POD for reading pleasure.
15 dpavlin 207 =head1 Models
17     Models in Jifty are at perl level objects (with validation and
18     canonicalization) and tables in database.
20     For a start, we implement some magic documented in L<A3C::Record> on records
21     (rows in database).
23     Then, we need to mungle data without re-thinking SQL queries which would
24     produce same results, so there is L<A3C::SQL> which produce objects that
25     look like L<Jifty::Collection>s, but aren't. This allows us to switch into
26     SQL in views if needed.
28     This method is not perfect, and shouldn't be used instead of Jifty models
29     just to write SQL because it doesn't do any permission checking. However,
30     it's a huge help for compex C<GROUP BY> and C<JOIN> queries which are hard
31     to express using L<Jifty::DBI>.
33     If we needed to generate those queries from within program (from user data,
34     for example) something like L<Fey::SQL> would be much better tool.
36 dpavlin 204 =head1 LDAP
38     Implement LDAP entry and edit interface (insteresting problem since most
39     values can have multiple entries which doesn't map nicely to relational
40     schema)
42     This can in turn be broken down into following tasks:
44     =head2 Import data from existing LDAP server
46     C<bin/import-ldap.pl> has embedded documentation
48     =head2 Query existing LDAP server
50     Since we are creating local copy of data, we need easy way to ask master
51     LDAP server for data. L<A3C::LDAP> provides way to query LDAP and receive
52     something similar enough to L<Jifty::Collection> so that L<A3C::View>s
53     doesn't have to be edited to switch from Jifty models to LDAP
54     data.
56     =head2 Create new entries and edit existing ones
58     We are in the middle of migaration from (generic) L<A3C::Model::Person> and
59     L<A3C::Model::Organization> to our custom L<A3C::Model::hrEduOrg> and
60     L<A3C::Model::hrEduPerson>
62     Most views I guess, will be implemented by subclassing L<Jifty::View::Declare::CRUD>.
63     Right now L<A3C::View::Organization> is such implementation.
65     Planned C<A3C::View::hrEduPerson> will implement another such view, and I
66     hope to see some kind of code reuse there (which should probably move to
67     C<Jifty::Plugin::TableCRUD>.
69     =head2 Virtual LDAP server to publish data
71     This part is in planning stage, and it will probably be based on L<Net::LDAP::Server>.
73     =head1 Existing LDAP schema
75     First, we needed a clever way to import existing LDAP schema into Jifty. So,
76     C<bin/ldap2model.pl> helper was created to handle that.
78     Some entries in LDAP schema have fixed list of attributed, and L<A3C::AAIEduHr>
79     implements fetcher (with cache) for that data.
81     =head1 Legacy portal integration
83     =head2 Parse PHP config files
85     Configuration files in PHP is only place in which part of portal
86     configuration is specified. To handle it in A3C, we use
87     L<A3C::Model::StrixInstance> which agregates all instance data. Parser is
88     implemented by L<A3C::PHP>
90     =head2 Connect to remote database
92     Implemented in two different ways:
94     =head3 Direct SQL execution
96     L<A3C::Action::StrixSQL> and interface as L<A3C::View::Strix/sql>.
98     =head3 Fetching data hashes
100     C<Strix> (which doesn't link well from on-line documentation so you will
101     have to take a look in C<lib/Strix.pm>) implements pure DBI code (ported
102     from php) to access data directly. Keep in mind that this data have to be
103     cached for any resonable performance. On the other hand, data can be
104 dpavlin 205 structured usefully, for example trees are structured in useful way for
105     direct output to JSON.
106 dpavlin 204
107     If tree has C<class> key, it can be set to C<error> so that we can mark
108     errors in data using same CSS class in views. This might be useful convention.
110 dpavlin 205 I prefer to keep this file documented up to level that make it's usage from Jifty and
111     C<t/50-strix.t> makes sanse, but not more than that.
113 dpavlin 204 =head1 HTML
115     We don't generate HTML using templates. In fact, all HTML is encoded in perl
116     code using L<Template::Declare>. This allows easy generation of valid HTML,
117     high-level templates which are perl code and easy skinning using CSS.
119     C<share/web/static/css/app.css> is used to store application specific CSS.
120     It should probably be split into several files (Jifty will concatenate them
121     for us anyway) for easier maintenance, probably by same logic as view names
122     to skip additional step of mapping when human are watching into code.
124 dpavlin 205 In long run, this should allow us to refactor templates at code level and
125     create different re-usable widgets which brings us to following topic...
127     =head1 AJAX
129     Jifty's way of AJAX are L<Jifty::Manual::PageRegions>.
131     =head2 Strix navigation
133     L<http://a3c.skole.hr/strix/navigation>
135     For now, we have implementation of two-level select which is in sync with
136     instance clipboard (implemented by L<A3C::Model::StrixInstanceSelection> and
137     L<A3C::View::Strix> and L<A3C::Action::StrixSelectSite>. This is
138     good candidate to refactor into reusable widget on it's own.
140 dpavlin 204 =head1 BUGS
142     Many probably, documented in C<TODO> which is also useful for quick overview
143     what changed between versions if svn commit log is too detailed allthough
144     first line of commit message might be good summary of each individual
145     change.

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