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package media
import "context"
func newWorkerPool(workers int) *workerPool {
// make a pool with the given worker capacity
pool := &workerPool{
workerQueue: make(chan *worker, workers),
}
// fill the pool with workers
for i := 0; i < workers; i++ {
pool.workerQueue <- &worker{
// give each worker a reference to the pool so it
// can put itself back in when it's finished
workerQueue: pool.workerQueue,
data: []byte{},
contentType: "",
accountID: "",
}
}
return pool
}
type workerPool struct {
workerQueue chan *worker
}
func (p *workerPool) run(fn func(ctx context.Context, data []byte, contentType string, accountID string)) (*Media, error) {
m := &Media{}
go func() {
// take a worker from the worker pool
worker := <-p.workerQueue
// tell it to work
worker.work(fn)
}()
return m, nil
}
type worker struct {
workerQueue chan *worker
data []byte
contentType string
accountID string
}
func (w *worker) work(fn func(ctx context.Context, data []byte, contentType string, accountID string)) {
// return self to pool when finished
defer w.finish()
// do the work
fn(context.Background(), w.data, w.contentType, w.accountID)
}
func (w *worker) finish() {
// clear self
w.data = []byte{}
w.contentType = ""
w.accountID = ""
// put self back in the worker pool
w.workerQueue <- w
}
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