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NAME="FUNCTION.REBUILDLISTENENTRIES"
>8.92. rebuildlistenentries()</A
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><P
> <P
><B
>Function Properties</B
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><P
><B
>Language: </B
>PLPGSQL</P
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><B
>Return Type: </B
>integer</P
>
RebuildListenEntries()
Invoked by various subscription and path modifying functions, this
rewrites the sl_listen entries, adding in all the ones required to
allow communications between nodes in the Slony-I cluster.
</P><PRE
CLASS="PROGRAMLISTING"
>declare
v_row record;
begin
-- First remove the entire configuration
delete from sl_listen;
-- Second populate the sl_listen configuration with a full
-- network of all possible paths.
insert into sl_listen
(li_origin, li_provider, li_receiver)
select pa_server, pa_server, pa_client from sl_path;
while true loop
insert into sl_listen
(li_origin, li_provider, li_receiver)
select distinct li_origin, pa_server, pa_client
from sl_listen, sl_path
where li_receiver = pa_server
and li_origin <> pa_client
except
select li_origin, li_provider, li_receiver
from sl_listen;
if not found then
exit;
end if;
end loop;
-- We now replace specific event-origin,receiver combinations
-- with a configuration that tries to avoid events arriving at
-- a node before the data provider actually has the data ready.
-- Loop over every possible pair of receiver and event origin
for v_row in select N1.no_id as receiver, N2.no_id as origin
from sl_node as N1, sl_node as N2
where N1.no_id <> N2.no_id
loop
-- 1st choice:
-- If we use the event origin as a data provider for any
-- set that originates on that very node, we are a direct
-- subscriber to that origin and listen there only.
if exists (select true from sl_set, sl_subscribe , sl_node p
where set_origin = v_row.origin
and sub_set = set_id
and sub_provider = v_row.origin
and sub_receiver = v_row.receiver
and sub_active
and p.no_active
and p.no_id=sub_provider
)
then
delete from sl_listen
where li_origin = v_row.origin
and li_receiver = v_row.receiver;
insert into sl_listen (li_origin, li_provider, li_receiver)
values (v_row.origin, v_row.origin, v_row.receiver);
continue;
end if;
-- 2nd choice:
-- If we are subscribed to any set originating on this
-- event origin, we want to listen on all data providers
-- we use for this origin. We are a cascaded subscriber
-- for sets from this node.
if exists (select true from sl_set, sl_subscribe
where set_origin = v_row.origin
and sub_set = set_id
and sub_receiver = v_row.receiver
and sub_active)
then
delete from sl_listen
where li_origin = v_row.origin
and li_receiver = v_row.receiver;
insert into sl_listen (li_origin, li_provider, li_receiver)
select distinct set_origin, sub_provider, v_row.receiver
from sl_set, sl_subscribe
where set_origin = v_row.origin
and sub_set = set_id
and sub_receiver = v_row.receiver
and sub_active;
continue;
end if;
end loop ;
return null ;
end ;</PRE
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