8.55. droppath(integer, integer)

    declare
    	p_pa_server		alias for $1;
    	p_pa_client		alias for $2;
    	v_row			record;
    begin
    	-- ----
    	-- Grab the central configuration lock
    	-- ----
    	lock table sl_config_lock;
    
    	-- ----
    	-- There should be no existing subscriptions. Auto unsubscribing
    	-- is considered too dangerous. 
    	-- ----
    	for v_row in select sub_set, sub_provider, sub_receiver
    			from sl_subscribe
    			where sub_provider = p_pa_server
    			and sub_receiver = p_pa_client
    	loop
    		raise exception 
    			'Slony-I: Path cannot be dropped, subscription of set % needs it',
    			v_row.sub_set;
    	end loop;
    
    	-- ----
    	-- Drop all sl_listen entries that depend on this path
    	-- ----
    	for v_row in select li_origin, li_provider, li_receiver
    			from sl_listen
    			where li_provider = p_pa_server
    			and li_receiver = p_pa_client
    	loop
    		perform dropListen(
    				v_row.li_origin, v_row.li_provider, v_row.li_receiver);
    	end loop;
    
    	-- ----
    	-- Now drop the path and create the event
    	-- ----
    	perform dropPath_int(p_pa_server, p_pa_client);
    
    	-- Rewrite sl_listen table
    	perform RebuildListenEntries();
    
    	return  createEvent ('_schemadoc', 'DROP_PATH',
    			p_pa_server::text, p_pa_client::text);
    end;