Function New

chapter7/patterns/pool/pool.go:29–38

New creates a pool that manages resources. A pool requires a function that can allocate a new resource and the size of the pool.

(fn func() (io.Closer, error), size uint)

// function that can allocate a new resource and the size of
// the pool.
func New(fn func() (io.Closer, error), size uint) (*Pool, error) {
	if size <= 0 {
		return nil, errors.New("Size value too small.")
	}

	return &Pool{
		factory:   fn,
		resources: make(chan io.Closer, size),
	}, nil
}

// Acquire retrieves a resource	from the pool.
func (p *Pool) Acquire() (io.Closer, error) {