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| package main | |
| type Sequencer struct { | |
| sync.Mutex | |
| tasks map[string]chan string | |
| } | |
| func (t *Sequencer) run(msg string) { | |
| for { | |
| select { | |
| case <-t.tasks[msg]: | |
| time.Sleep(5 * time.Second) | |
| println(msg) | |
| default: | |
| t.Lock() | |
| select { | |
| case <-t.tasks[msg]: | |
| t.Unlock() | |
| time.Sleep(2 * time.Second) | |
| println(msg) | |
| default: | |
| close(t.tasks[msg]) | |
| delete(t.tasks, msg) | |
| t.Unlock() | |
| return | |
| } | |
| } | |
| } | |
| } | |
| func (t *Sequencer) Execute(msg string) { | |
| t.Lock() | |
| tasks, ok := t.tasks[msg] | |
| if !ok { | |
| ch := make(chan string, 5) | |
| ch <- msg | |
| t.tasks[msg] = ch | |
| t.Unlock() | |
| go t.run(msg) | |
| return | |
| } | |
| tasks <- msg | |
| t.Unlock() | |
| } | |
| func NewSequencer() *Sequencer { | |
| return &Sequencer{ | |
| tasks: make(map[string]chan string), | |
| } | |
| } | |
| func main() { | |
| s := NewSequencer() | |
| go s.Execute("fuck") | |
| go s.Execute("fuck") | |
| go s.Execute("shit") | |
| go s.Execute("shit") | |
| go s.Execute("shit") | |
| go s.Execute("bowl") | |
| time.Sleep(100 * time.Second) | |
| } |
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