mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-30 10:10:21 +00:00
104 lines
3.1 KiB
Go
104 lines
3.1 KiB
Go
package restful
|
|
|
|
// Copyright 2015 Ernest Micklei. All rights reserved.
|
|
// Use of this source code is governed by a license
|
|
// that can be found in the LICENSE file.
|
|
|
|
import (
|
|
"compress/gzip"
|
|
"compress/zlib"
|
|
)
|
|
|
|
// BoundedCachedCompressors is a CompressorProvider that uses a cache with a fixed amount
|
|
// of writers and readers (resources).
|
|
// If a new resource is acquired and all are in use, it will return a new unmanaged resource.
|
|
type BoundedCachedCompressors struct {
|
|
gzipWriters chan *gzip.Writer
|
|
gzipReaders chan *gzip.Reader
|
|
zlibWriters chan *zlib.Writer
|
|
writersCapacity int
|
|
readersCapacity int
|
|
}
|
|
|
|
// NewBoundedCachedCompressors returns a new, with filled cache, BoundedCachedCompressors.
|
|
func NewBoundedCachedCompressors(writersCapacity, readersCapacity int) *BoundedCachedCompressors {
|
|
b := &BoundedCachedCompressors{
|
|
gzipWriters: make(chan *gzip.Writer, writersCapacity),
|
|
gzipReaders: make(chan *gzip.Reader, readersCapacity),
|
|
zlibWriters: make(chan *zlib.Writer, writersCapacity),
|
|
writersCapacity: writersCapacity,
|
|
readersCapacity: readersCapacity,
|
|
}
|
|
for ix := 0; ix < writersCapacity; ix++ {
|
|
b.gzipWriters <- newGzipWriter()
|
|
b.zlibWriters <- newZlibWriter()
|
|
}
|
|
for ix := 0; ix < readersCapacity; ix++ {
|
|
b.gzipReaders <- newGzipReader()
|
|
}
|
|
return b
|
|
}
|
|
|
|
// AcquireGzipWriter returns an resettable *gzip.Writer. Needs to be released.
|
|
func (b *BoundedCachedCompressors) AcquireGzipWriter() *gzip.Writer {
|
|
var writer *gzip.Writer
|
|
select {
|
|
case writer, _ = <-b.gzipWriters:
|
|
default:
|
|
// return a new unmanaged one
|
|
writer = newGzipWriter()
|
|
}
|
|
return writer
|
|
}
|
|
|
|
// ReleaseGzipWriter accepts a writer (does not have to be one that was cached)
|
|
// only when the cache has room for it. It will ignore it otherwise.
|
|
func (b *BoundedCachedCompressors) ReleaseGzipWriter(w *gzip.Writer) {
|
|
// forget the unmanaged ones
|
|
if len(b.gzipWriters) < b.writersCapacity {
|
|
b.gzipWriters <- w
|
|
}
|
|
}
|
|
|
|
// AcquireGzipReader returns a *gzip.Reader. Needs to be released.
|
|
func (b *BoundedCachedCompressors) AcquireGzipReader() *gzip.Reader {
|
|
var reader *gzip.Reader
|
|
select {
|
|
case reader, _ = <-b.gzipReaders:
|
|
default:
|
|
// return a new unmanaged one
|
|
reader = newGzipReader()
|
|
}
|
|
return reader
|
|
}
|
|
|
|
// ReleaseGzipReader accepts a reader (does not have to be one that was cached)
|
|
// only when the cache has room for it. It will ignore it otherwise.
|
|
func (b *BoundedCachedCompressors) ReleaseGzipReader(r *gzip.Reader) {
|
|
// forget the unmanaged ones
|
|
if len(b.gzipReaders) < b.readersCapacity {
|
|
b.gzipReaders <- r
|
|
}
|
|
}
|
|
|
|
// AcquireZlibWriter returns an resettable *zlib.Writer. Needs to be released.
|
|
func (b *BoundedCachedCompressors) AcquireZlibWriter() *zlib.Writer {
|
|
var writer *zlib.Writer
|
|
select {
|
|
case writer, _ = <-b.zlibWriters:
|
|
default:
|
|
// return a new unmanaged one
|
|
writer = newZlibWriter()
|
|
}
|
|
return writer
|
|
}
|
|
|
|
// ReleaseZlibWriter accepts a writer (does not have to be one that was cached)
|
|
// only when the cache has room for it. It will ignore it otherwise.
|
|
func (b *BoundedCachedCompressors) ReleaseZlibWriter(w *zlib.Writer) {
|
|
// forget the unmanaged ones
|
|
if len(b.zlibWriters) < b.writersCapacity {
|
|
b.zlibWriters <- w
|
|
}
|
|
}
|