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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| // Copyright © 2023 Meroxa, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package stream | ||
|
|
||
| import ( | ||
| "context" | ||
| "reflect" | ||
| ) | ||
|
|
||
| func (n *FaninNode) chooseSelectFunc(ctx context.Context, in []<-chan *Message) func() (int, *Message, bool) { | ||
| switch len(in) { | ||
| case 1: | ||
| return func() (int, *Message, bool) { return n.select1(ctx, in[0]) } | ||
| case 2: | ||
| return func() (int, *Message, bool) { return n.select2(ctx, in[0], in[1]) } | ||
| case 3: | ||
| return func() (int, *Message, bool) { return n.select3(ctx, in[0], in[1], in[2]) } | ||
| case 4: | ||
| return func() (int, *Message, bool) { return n.select4(ctx, in[0], in[1], in[2], in[3]) } | ||
| case 5: | ||
| return func() (int, *Message, bool) { return n.select5(ctx, in[0], in[1], in[2], in[3], in[4]) } | ||
| case 6: | ||
| return func() (int, *Message, bool) { return n.select6(ctx, in[0], in[1], in[2], in[3], in[4], in[5]) } | ||
| default: | ||
| // use reflection for more channels | ||
| cases := make([]reflect.SelectCase, len(in)+1) | ||
| cases[0] = reflect.SelectCase{Dir: reflect.SelectRecv, Chan: reflect.ValueOf(ctx.Done())} | ||
| for i, ch := range in { | ||
| cases[i+1] = reflect.SelectCase{Dir: reflect.SelectRecv, Chan: reflect.ValueOf(ch)} | ||
| } | ||
| return func() (int, *Message, bool) { | ||
| chosen, value, ok := reflect.Select(cases) | ||
| if !ok { // a channel was closed | ||
| return chosen, nil, ok | ||
| } | ||
| return chosen, value.Interface().(*Message), ok | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (*FaninNode) select1( | ||
| ctx context.Context, | ||
| c1 <-chan *Message, | ||
| ) (int, *Message, bool) { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return 0, nil, false | ||
| case val, ok := <-c1: | ||
| return 1, val, ok | ||
| } | ||
| } | ||
|
|
||
| func (*FaninNode) select2( | ||
| ctx context.Context, | ||
| c1 <-chan *Message, | ||
| c2 <-chan *Message, | ||
| ) (int, *Message, bool) { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return 0, nil, false | ||
| case val, ok := <-c1: | ||
| return 1, val, ok | ||
| case val, ok := <-c2: | ||
| return 2, val, ok | ||
| } | ||
| } | ||
|
|
||
| func (*FaninNode) select3( | ||
| ctx context.Context, | ||
| c1 <-chan *Message, | ||
| c2 <-chan *Message, | ||
| c3 <-chan *Message, | ||
| ) (int, *Message, bool) { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return 0, nil, false | ||
| case val, ok := <-c1: | ||
| return 1, val, ok | ||
| case val, ok := <-c2: | ||
| return 2, val, ok | ||
| case val, ok := <-c3: | ||
| return 3, val, ok | ||
| } | ||
| } | ||
|
|
||
| func (*FaninNode) select4( | ||
| ctx context.Context, | ||
| c1 <-chan *Message, | ||
| c2 <-chan *Message, | ||
| c3 <-chan *Message, | ||
| c4 <-chan *Message, | ||
| ) (int, *Message, bool) { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return 0, nil, false | ||
| case val, ok := <-c1: | ||
| return 1, val, ok | ||
| case val, ok := <-c2: | ||
| return 2, val, ok | ||
| case val, ok := <-c3: | ||
| return 3, val, ok | ||
| case val, ok := <-c4: | ||
| return 4, val, ok | ||
| } | ||
| } | ||
|
|
||
| func (*FaninNode) select5( | ||
| ctx context.Context, | ||
| c1 <-chan *Message, | ||
| c2 <-chan *Message, | ||
| c3 <-chan *Message, | ||
| c4 <-chan *Message, | ||
| c5 <-chan *Message, | ||
| ) (int, *Message, bool) { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return 0, nil, false | ||
| case val, ok := <-c1: | ||
| return 1, val, ok | ||
| case val, ok := <-c2: | ||
| return 2, val, ok | ||
| case val, ok := <-c3: | ||
| return 3, val, ok | ||
| case val, ok := <-c4: | ||
| return 4, val, ok | ||
| case val, ok := <-c5: | ||
| return 5, val, ok | ||
| } | ||
| } | ||
|
|
||
| func (*FaninNode) select6( | ||
| ctx context.Context, | ||
| c1 <-chan *Message, | ||
| c2 <-chan *Message, | ||
| c3 <-chan *Message, | ||
| c4 <-chan *Message, | ||
| c5 <-chan *Message, | ||
| c6 <-chan *Message, | ||
| ) (int, *Message, bool) { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return 0, nil, false | ||
| case val, ok := <-c1: | ||
| return 1, val, ok | ||
| case val, ok := <-c2: | ||
| return 2, val, ok | ||
| case val, ok := <-c3: | ||
| return 3, val, ok | ||
| case val, ok := <-c4: | ||
| return 4, val, ok | ||
| case val, ok := <-c5: | ||
| return 5, val, ok | ||
| case val, ok := <-c6: | ||
| return 6, val, ok | ||
| } | ||
| } |
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