haiku/docs/user/mail/Programming Notes/ChainRunner Overview.txt
Alexander G.M. Smith c181c43dc1 More documentation moved over from SourceForge, so it's not quite up to date.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15965 a95241bf-73f2-0310-859d-f6bbb57e9c96
2006-01-15 22:43:21 +00:00

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NathanW wrote on June 30 2003:
Here's the overview:
ChainRunner:
It's now a BLooper and it goes like this: Running the chain
triggers an 'INIT' message, which causes it to begin to load add-ons.
The constructor of the producer add-on calls ChainRunner's
GetMessages() routine with a list of unique ids to fetch. It then runs
through the list, passing in those, then calls any registered process
callbacks after the list is exhausted. Note that finishing the list *
does not* cause the connection to be terminated and the add-ons to be
destructed. Single pass add-ons (e.g. POP and Outbox) register a
process callback that calls ChainRunner::Stop().
MailProtocol/MailFilter:
No longer sets the unique id, because it's passed in. Calls
GetMessages(), and uses ReportProgress() and ShowError() methods of
ChainRunner instead of using the functions in status.h. Also sets SIZE
attribute in out_headers that contains the final downloaded size of the
message. Also now passed a ChainRunner instead of a StatusView.
That's about it, really.
-Nathan