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create or replace function pgq.drop_queue(x_queue_name text, x_force bool)
returns integer as $$
-- ----------------------------------------------------------------------
-- Function: pgq.drop_queue(2)
--
-- Drop queue and all associated tables.
--
-- Parameters:
-- x_queue_name - queue name
-- x_force - ignore (drop) existing consumers
-- Returns:
-- 1 - success
-- Calls:
-- pgq.unregister_consumer(queue_name, consumer_name)
-- perform pgq.ticker(i_queue_name);
-- perform pgq.tune_storage(i_queue_name);
-- Tables directly manipulated:
-- delete - pgq.queue
-- drop - pgq.event_N (), pgq.event_N_0 .. pgq.event_N_M
-- ----------------------------------------------------------------------
declare
tblname text;
q record;
num integer;
begin
-- check if exists
select * into q from pgq.queue
where queue_name = x_queue_name
for update;
if not found then
raise exception 'No such event queue';
end if;
if x_force then
perform pgq.unregister_consumer(queue_name, consumer_name)
from pgq.get_consumer_info(x_queue_name);
else
-- check if no consumers
select count(*) into num from pgq.subscription
where sub_queue = q.queue_id;
if num > 0 then
raise exception 'cannot drop queue, consumers still attached';
end if;
end if;
-- drop data tables
for i in 0 .. (q.queue_ntables - 1) loop
tblname := q.queue_data_pfx || '_' || i::text;
execute 'DROP TABLE ' || pgq.quote_fqname(tblname);
end loop;
execute 'DROP TABLE ' || pgq.quote_fqname(q.queue_data_pfx);
-- delete ticks
delete from pgq.tick where tick_queue = q.queue_id;
-- drop seqs
-- FIXME: any checks needed here?
execute 'DROP SEQUENCE ' || pgq.quote_fqname(q.queue_tick_seq);
execute 'DROP SEQUENCE ' || pgq.quote_fqname(q.queue_event_seq);
-- delete event
delete from pgq.queue
where queue_name = x_queue_name;
return 1;
end;
$$ language plpgsql security definer;
create or replace function pgq.drop_queue(x_queue_name text)
returns integer as $$
-- ----------------------------------------------------------------------
-- Function: pgq.drop_queue(1)
--
-- Drop queue and all associated tables.
-- No consumers must be listening on the queue.
--
-- ----------------------------------------------------------------------
begin
return pgq.drop_queue(x_queue_name, false);
end;
$$ language plpgsql strict;
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