GODT-1815: Combined/Split mode

internal/pool/job.go

@@ -0,0 +1,41 @@
+package pool
+
+import "context"
+
+type job[In, Out any] struct {
+	ctx context.Context
+	req In
+
+	res chan Out
+	err chan error
+
+	done chan struct{}
+}
+
+func newJob[In, Out any](ctx context.Context, req In) *job[In, Out] {
+	return &job[In, Out]{
+		ctx:  ctx,
+		req:  req,
+		res:  make(chan Out),
+		err:  make(chan error),
+		done: make(chan struct{}),
+	}
+}
+
+func (job *job[In, Out]) result() (Out, error) {
+	return <-job.res, <-job.err
+}
+
+func (job *job[In, Out]) postSuccess(res Out) {
+	close(job.err)
+	job.res <- res
+}
+
+func (job *job[In, Out]) postFailure(err error) {
+	close(job.res)
+	job.err <- err
+}
+
+func (job *job[In, Out]) waitDone() {
+	<-job.done
+}