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a293b2bf94
Travis seems to be having issues pulling deps, so we'll have to check in the vendor directory and prevent the makefile from trying to regenerate it normally.
103 lines
3.1 KiB
Go
103 lines
3.1 KiB
Go
package restful
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// Copyright 2015 Ernest Micklei. All rights reserved.
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// Use of this source code is governed by a license
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// that can be found in the LICENSE file.
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import (
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"compress/gzip"
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"compress/zlib"
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)
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// BoundedCachedCompressors is a CompressorProvider that uses a cache with a fixed amount
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// of writers and readers (resources).
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// If a new resource is acquired and all are in use, it will return a new unmanaged resource.
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type BoundedCachedCompressors struct {
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gzipWriters chan *gzip.Writer
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gzipReaders chan *gzip.Reader
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zlibWriters chan *zlib.Writer
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writersCapacity int
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readersCapacity int
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}
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// NewBoundedCachedCompressors returns a new, with filled cache, BoundedCachedCompressors.
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func NewBoundedCachedCompressors(writersCapacity, readersCapacity int) *BoundedCachedCompressors {
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b := &BoundedCachedCompressors{
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gzipWriters: make(chan *gzip.Writer, writersCapacity),
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gzipReaders: make(chan *gzip.Reader, readersCapacity),
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zlibWriters: make(chan *zlib.Writer, writersCapacity),
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writersCapacity: writersCapacity,
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readersCapacity: readersCapacity,
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}
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for ix := 0; ix < writersCapacity; ix++ {
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b.gzipWriters <- newGzipWriter()
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b.zlibWriters <- newZlibWriter()
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}
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for ix := 0; ix < readersCapacity; ix++ {
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b.gzipReaders <- newGzipReader()
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}
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return b
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}
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// AcquireGzipWriter returns an resettable *gzip.Writer. Needs to be released.
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func (b *BoundedCachedCompressors) AcquireGzipWriter() *gzip.Writer {
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var writer *gzip.Writer
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select {
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case writer, _ = <-b.gzipWriters:
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default:
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// return a new unmanaged one
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writer = newGzipWriter()
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}
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return writer
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}
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// ReleaseGzipWriter accepts a writer (does not have to be one that was cached)
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// only when the cache has room for it. It will ignore it otherwise.
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func (b *BoundedCachedCompressors) ReleaseGzipWriter(w *gzip.Writer) {
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// forget the unmanaged ones
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if len(b.gzipWriters) < b.writersCapacity {
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b.gzipWriters <- w
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}
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}
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// AcquireGzipReader returns a *gzip.Reader. Needs to be released.
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func (b *BoundedCachedCompressors) AcquireGzipReader() *gzip.Reader {
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var reader *gzip.Reader
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select {
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case reader, _ = <-b.gzipReaders:
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default:
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// return a new unmanaged one
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reader = newGzipReader()
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}
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return reader
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}
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// ReleaseGzipReader accepts a reader (does not have to be one that was cached)
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// only when the cache has room for it. It will ignore it otherwise.
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func (b *BoundedCachedCompressors) ReleaseGzipReader(r *gzip.Reader) {
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// forget the unmanaged ones
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if len(b.gzipReaders) < b.readersCapacity {
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b.gzipReaders <- r
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}
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}
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// AcquireZlibWriter returns an resettable *zlib.Writer. Needs to be released.
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func (b *BoundedCachedCompressors) AcquireZlibWriter() *zlib.Writer {
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var writer *zlib.Writer
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select {
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case writer, _ = <-b.zlibWriters:
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default:
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// return a new unmanaged one
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writer = newZlibWriter()
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}
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return writer
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}
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// ReleaseZlibWriter accepts a writer (does not have to be one that was cached)
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// only when the cache has room for it. It will ignore it otherwise.
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func (b *BoundedCachedCompressors) ReleaseZlibWriter(w *zlib.Writer) {
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// forget the unmanaged ones
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if len(b.zlibWriters) < b.writersCapacity {
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b.zlibWriters <- w
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}
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}
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