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NAME="FUNCTION.STORELISTEN-INT-P-LI-RECEIVER-INTEGER-P-LI-PROVIDER-INTEGER-P-LI-ORIGIN-INTEGER"
>8.119. storelisten_int(p_li_receiver integer, p_li_provider integer, p_li_origin integer)</A
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> <P
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>Function Properties</B
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>Language: </B
>PLPGSQL</P
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>Return Type: </B
>integer</P
>
FUNCTION storeListen_int (li_origin, li_provider, li_receiver)
Process STORE_LISTEN event, indicating that receiver node li_receiver
listens to node li_provider in order to get messages coming from node
li_origin.
</P><PRE
CLASS="PROGRAMLISTING"
>declare
v_exists int4;
begin
-- ----
-- Grab the central configuration lock
-- ----
lock table sl_config_lock;
select 1 into v_exists
from sl_listen
where li_origin = p_li_origin
and li_provider = p_li_provider
and li_receiver = p_li_receiver;
if not found then
-- ----
-- In case we receive STORE_LISTEN events before we know
-- about the nodes involved in this, we generate those nodes
-- as pending.
-- ----
if not exists (select 1 from sl_node
where no_id = p_li_origin) then
perform storeNode_int (p_li_origin, '<event pending>');
end if;
if not exists (select 1 from sl_node
where no_id = p_li_provider) then
perform storeNode_int (p_li_provider, '<event pending>');
end if;
if not exists (select 1 from sl_node
where no_id = p_li_receiver) then
perform storeNode_int (p_li_receiver, '<event pending>');
end if;
insert into sl_listen
(li_origin, li_provider, li_receiver) values
(p_li_origin, p_li_provider, p_li_receiver);
end if;
return 0;
end;</PRE
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