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# This is an example for the usage of IOHubs:
LoadPackage("orb");
HashServer := function(pt,size,addr,port,chunksize)
local done,h,ht,i,l,len,p,r,todo,val;
ht := HTCreate(pt,rec( treehashsize := size ));
todo := [];
h := IOHub();
AttachServingSocket(h,addr,port);
done := false;
while not(done) do
DoIO(h,true); # this is blocking
#Print("done\n");
while true do
r := GetInput(h,0); # a pair [connection,string]
#Print(r,"\n");
if r = false then break; fi;
if r[2] = "exit" then done := true; break; fi;
if r[2] = "gettask" then
len := Length(todo);
if len = 0 then
l := [];
elif len >= chunksize then
l := todo{[len-chunksize+1..len]};
for i in [len,len-1..len-chunksize+1] do
Unbind(l[i]);
od;
else
l := ShallowCopy(todo);
for i in [len,len-1..1] do
Unbind(l[i]);
od;
fi;
SubmitOutput(h,r[1],IO_Pickle(l));
else # some new points
l := IO_Unpickle(r[2]);
for p in l do
val := HTValue(ht,p);
if val = fail then
HTAdd(ht,p,true);
Add(todo,p);
fi;
od;
fi;
DoIO(h,false); # non-blocking!
od;
od;
Shutdown(h);
end;
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