func grabBufferAndUseIt(pool gopool.Pool) error {
// WARNING: Must ensure resource returns to pool otherwise gopool will deadlock once all
// resources used.
bb := pool.Get().(*bytes.Buffer)
defer pool.Put(bb) // IMPORTANT: defer here to ensure invoked even when subsequent code bails
for k := 0; k < bufSize; k++ {
if rand.Intn(100000000) == 1 {
return errors.New("random error to illustrate need to return resource to pool")
}
bb.WriteByte(byte(k % 256))
}
return nil
}
func testC(bp gopool.Pool, concurrency, loops int) {
const byteCount = defaultBufSize / 2
var wg sync.WaitGroup
wg.Add(concurrency)
for c := 0; c < concurrency; c++ {
go func() {
for j := 0; j < loops; j++ {
bb := bp.Get().(*bytes.Buffer)
max := byteCount
if j%8 == 0 {
max = 2 * defaultMaxKeep
}
for k := 0; k < max; k++ {
bb.WriteByte(byte(k % 256))
}
bp.Put(bb)
}
wg.Done()
}()
}
wg.Wait()
}