| 44 | } |
| 45 | |
| 46 | func (s *ExprSwitch) Forward(router *op.Router, batch sbuf.Batch) bool { |
| 47 | vals := batch.Values() |
| 48 | for i := range vals { |
| 49 | val := s.expr.Eval(vals[i]) |
| 50 | if val.IsMissing() { |
| 51 | continue |
| 52 | } |
| 53 | which, ok := s.cases[string(val.Bytes())] |
| 54 | if !ok { |
| 55 | which = s.defaultCase |
| 56 | } |
| 57 | if which == nil { |
| 58 | continue |
| 59 | } |
| 60 | which.vals = append(which.vals, vals[i]) |
| 61 | } |
| 62 | // Send each case that has vals from this batch. |
| 63 | // We have vals that point into the current batch so we |
| 64 | // ref the batch for each outgoing new batch. |
| 65 | for _, c := range s.cases { |
| 66 | if len(c.vals) > 0 { |
| 67 | // XXX The new slice should come from the |
| 68 | // outgoing batch so we don't send these slices |
| 69 | // through GC. |
| 70 | batch.Ref() |
| 71 | out := sbuf.NewBatch(c.vals) |
| 72 | c.vals = nil |
| 73 | if ok := router.Send(c.route, out, nil); !ok { |
| 74 | return false |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | if c := s.defaultCase; c != nil && len(c.vals) > 0 { |
| 79 | batch.Ref() |
| 80 | out := sbuf.NewArray(c.vals) |
| 81 | c.vals = nil |
| 82 | if ok := router.Send(c.route, out, nil); !ok { |
| 83 | return false |
| 84 | } |
| 85 | } |
| 86 | return true |
| 87 | } |