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modules/client/rooms/messages: Add postprefetching loop to optimize pagination.

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This commit is contained in:
Jason Volk 2020-04-08 13:38:59 -07:00
parent 8af5eea783
commit 2451e3933f
1 changed files with 21 additions and 1 deletions
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22
modules/client/rooms/messages.cc
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@ -168,9 +168,28 @@ get__messages(client &client,
top, "end", json::value{end}
};
// Manually close out and flush here so the client isn't impacted by
// anything related to the postprefetching loop below.
top.~object();
out.flush(true);
response.finish();
// Continue the room::events iteration to prefetch the next results for a
// client hitting /messages to paginate. This endpoint does not conduct any
// other prefetching because: 1. The first /messages is predicted by other
// requests which initiate prefetches. 2. Subsequent /messages are
// prefetched by the following loop after each request from here. Note that
// this loop does not yet account for visibility and filters etc.
size_t postfetched(0);
for(size_t i(0); i <= page.limit && it; ++i, page.dir == 'b'? --it : ++it)
{
const auto &event_idx(it.event_idx());
postfetched += m::prefetch(event_idx);
}
log::debug
{
messages_log, "%s in %s from:%s to:%s dir:%c limit:%zu start:%s end:%s hit:%zu miss:%zu",
messages_log, "%s in %s from:%s to:%s dir:%c limit:%zu start:%s end:%s hit:%zu miss:%zu post:%zu",
client.loghead(),
string_view{room_id},
string_view{page.from},
@ -181,6 +200,7 @@ get__messages(client &client,
string_view{end},
hit,
miss,
postfetched,
};
return {};