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package util
// initial version comes from https://hackernoon.com/asyncawait-in-golang-an-introductory-guide-ol1e34sg
import "context"
type Future interface {
Await() interface{}
}
type future struct {
await func(ctx context.Context) interface{}
}
func (f future) Await() interface{} {
return f.await(context.Background())
}
type LimitedAsyncExecutor struct {
executor *LimitedConcurrentExecutor
}
func NewLimitedAsyncExecutor(limit int) *LimitedAsyncExecutor {
return &LimitedAsyncExecutor{
executor: NewLimitedConcurrentExecutor(limit),
}
}
func (ae *LimitedAsyncExecutor) Execute(job func() interface{}) Future {
var result interface{}
c := make(chan struct{})
ae.executor.Execute(func() {
defer close(c)
result = job()
})
return future{await: func(ctx context.Context) interface{} {
select {
case <-ctx.Done():
return ctx.Err()
case <-c:
return result
}
}}
}
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