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async.go
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/
async.go
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package resolvers
import (
"errors"
"reflect"
)
func (this *ResolveRequest) RunAsync(resolver Resolution) Resolution {
type resolution struct {
result reflect.Value
err error
}
channel := make(chan *resolution, 1)
r := resolution{
result: reflect.Value{},
err: errors.New("Unknown"),
}
// Limit the number of concurrent go routines that we startup.
*this.ExecutionContext.GetLimiter() <- 1
go func() {
// Setup some post processing
defer func() {
err := this.ExecutionContext.HandlePanic(this.SelectionPath())
if err != nil {
r.err = err
}
<-*this.ExecutionContext.GetLimiter()
channel <- &r // we do this in defer since the resolver() could panic.
}()
// Stash the results, then get sent back in the defer.
r.result, r.err = resolver()
}()
// Return a resolver that waits for the async results
return func() (reflect.Value, error) {
r := <-channel
return r.result, r.err
}
}