forked from TrueCloudLab/restic
54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
package archiver
|
|
|
|
// buffer is a reusable buffer. After the buffer has been used, Release should
|
|
// be called so the underlying slice is put back into the pool.
|
|
type buffer struct {
|
|
Data []byte
|
|
pool *bufferPool
|
|
}
|
|
|
|
// Release puts the buffer back into the pool it came from.
|
|
func (b *buffer) Release() {
|
|
pool := b.pool
|
|
if pool == nil || cap(b.Data) > pool.defaultSize {
|
|
return
|
|
}
|
|
|
|
select {
|
|
case pool.ch <- b:
|
|
default:
|
|
}
|
|
}
|
|
|
|
// bufferPool implements a limited set of reusable buffers.
|
|
type bufferPool struct {
|
|
ch chan *buffer
|
|
defaultSize int
|
|
}
|
|
|
|
// newBufferPool initializes a new buffer pool. The pool stores at most max
|
|
// items. New buffers are created with defaultSize. Buffers that have grown
|
|
// larger are not put back.
|
|
func newBufferPool(max int, defaultSize int) *bufferPool {
|
|
b := &bufferPool{
|
|
ch: make(chan *buffer, max),
|
|
defaultSize: defaultSize,
|
|
}
|
|
return b
|
|
}
|
|
|
|
// Get returns a new buffer, either from the pool or newly allocated.
|
|
func (pool *bufferPool) Get() *buffer {
|
|
select {
|
|
case buf := <-pool.ch:
|
|
return buf
|
|
default:
|
|
}
|
|
|
|
b := &buffer{
|
|
Data: make([]byte, pool.defaultSize),
|
|
pool: pool,
|
|
}
|
|
|
|
return b
|
|
}
|