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new: added Proc, Txn, Runner, Seq, Para, RunSeq, and RunPara (#11)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| // Copyright (C) 2022 Takayuki Sato. All Rights Reserved. | ||
| // This program is free software under MIT License. | ||
| // See the file LICENSE in this distribution for more details. | ||
|
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| package sabi | ||
|
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| import ( | ||
| "strconv" | ||
| ) | ||
|
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| type /* error reasons */ ( | ||
| // FailToRunInParallel is a error reason which indicates some runner which | ||
| // is runned in parallel failed. | ||
| FailToRunInParallel struct { | ||
| Errors map[string]Err | ||
| } | ||
| ) | ||
|
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| // Runner is an interface which has #Run method and is runned by RunSeq or | ||
| // RunPara functions. | ||
| type Runner interface { | ||
| Run() Err | ||
| } | ||
|
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| type seqRunner struct { | ||
| runners []Runner | ||
| } | ||
|
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| func (r seqRunner) Run() Err { | ||
| for _, runner := range r.runners { | ||
| err := runner.Run() | ||
| if !err.IsOk() { | ||
| return err | ||
| } | ||
| } | ||
| return Ok() | ||
| } | ||
|
|
||
| // Seq is a function which creates a runner which runs multiple runners | ||
| // specified as arguments sequencially. | ||
| func Seq(runners ...Runner) Runner { | ||
| return seqRunner{runners: runners[:]} | ||
| } | ||
|
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| type paraRunner struct { | ||
| runners []Runner | ||
| } | ||
|
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| func (r paraRunner) Run() Err { | ||
| ch := make(chan Err) | ||
|
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| for _, runner := range r.runners { | ||
| go func(runner Runner, ch chan Err) { | ||
| err := runner.Run() | ||
| ch <- err | ||
| }(runner, ch) | ||
| } | ||
|
|
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| errs := make(map[string]Err) | ||
| n := len(r.runners) | ||
| for i := 0; i < n; i++ { | ||
| select { | ||
| case err := <-ch: | ||
| if !err.IsOk() { | ||
| errs[strconv.Itoa(i)] = err | ||
| } | ||
| } | ||
| } | ||
|
|
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| if len(errs) > 0 { | ||
| return ErrBy(FailToRunInParallel{Errors: errs}) | ||
| } | ||
|
|
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| return Ok() | ||
| } | ||
|
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| // Para is a function which creates a runner which runs multiple runners | ||
| // specified as arguments in parallel. | ||
| func Para(runners ...Runner) Runner { | ||
| return paraRunner{runners: runners[:]} | ||
| } | ||
|
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| // RunSeq is a function which runs specified runners sequencially. | ||
| func RunSeq(runners ...Runner) Err { | ||
| for _, runner := range runners { | ||
| err := runner.Run() | ||
| if !err.IsOk() { | ||
| return err | ||
| } | ||
| } | ||
| return Ok() | ||
| } | ||
|
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| // RunPara is a function which runs specified runners in parallel. | ||
| func RunPara(runners ...Runner) Err { | ||
| ch := make(chan Err) | ||
|
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| for _, runner := range runners { | ||
| go func(runner Runner, ch chan Err) { | ||
| err := runner.Run() | ||
| ch <- err | ||
| }(runner, ch) | ||
| } | ||
|
|
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| errs := make(map[string]Err) | ||
| n := len(runners) | ||
| for i := 0; i < n; i++ { | ||
| select { | ||
| case err := <-ch: | ||
| if !err.IsOk() { | ||
| errs[strconv.Itoa(i)] = err | ||
| } | ||
| } | ||
| } | ||
|
|
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| if len(errs) > 0 { | ||
| return ErrBy(FailToRunInParallel{Errors: errs}) | ||
| } | ||
|
|
||
| return Ok() | ||
| } |
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