drop down menu - Eclipse Scout call getDataByKey to many times -

i have form table. table has smart fields.

my problem when fill data in table (by initialization) smart fields call getdatabykey id (what right) not called once expect 30 times.

i dig little bit answer , discovered function called many times, because inside class abstracttable inside processdecorationbuffer table calls m_celllookupbuffer has lot of calls stored inside (512 insted 9).

has same problem?

when have smartcolumn in table, scout needs lookup "key -> text" each row. mentioned, in cases can expensive. why there additional concept: batchlookupcall / batchlookupservice.

the idea first collect rows , required lookupcall , process them in 1 batch.

to answer question, had set small playground project. here key points have noticed:

type of key

batch lookupcall check equals method of call relies on equality of key object. if using custom type key, ensure equals() , hashcode() implemented.

way of adding rows in table

if add rows 1 after other, this:

table table = getmytablefield().gettable(); itablerow r;  r = table.addrow(table.createrow()); table.gettextcolumn().setvalue(r, "lorem"); table.getmycolumn().setvalue(r, 1l);  r = table.addrow(table.createrow()); table.gettextcolumn().setvalue(r, "ipsum"); table.getmycolumn().setvalue(r, 3l);  r = table.addrow(table.createrow()); table.gettextcolumn().setvalue(r, "dolor"); table.getmycolumn().setvalue(r, 1l);  r = table.addrow(table.createrow()); table.gettextcolumn().setvalue(r, "figus"); table.getmycolumn().setvalue(r, 4l); 

scout computes table content often… observe many calls lookup service. think there optimization possibility in domain.

this not happen if import rows in 1 step, example using tabledata included in formdata or in tablepagedata.