prometheus/vendor/github.com/json-iterator/go/feature_pool.go

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2017-12-02 06:47:38 -08:00
package jsoniter
import (
"io"
)
// IteratorPool a thread safe pool of iterators with same configuration
type IteratorPool interface {
BorrowIterator(data []byte) *Iterator
ReturnIterator(iter *Iterator)
}
// StreamPool a thread safe pool of streams with same configuration
type StreamPool interface {
BorrowStream(writer io.Writer) *Stream
ReturnStream(stream *Stream)
}
func (cfg *frozenConfig) BorrowStream(writer io.Writer) *Stream {
select {
case stream := <-cfg.streamPool:
stream.Reset(writer)
return stream
default:
return NewStream(cfg, writer, 512)
}
}
func (cfg *frozenConfig) ReturnStream(stream *Stream) {
stream.Error = nil
stream.Attachment = nil
select {
case cfg.streamPool <- stream:
return
default:
return
}
}
func (cfg *frozenConfig) BorrowIterator(data []byte) *Iterator {
select {
case iter := <-cfg.iteratorPool:
iter.ResetBytes(data)
return iter
default:
return ParseBytes(cfg, data)
}
}
func (cfg *frozenConfig) ReturnIterator(iter *Iterator) {
iter.Error = nil
iter.Attachment = nil
select {
case cfg.iteratorPool <- iter:
return
default:
return
}
}