go/json-iterator
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document how to get best performance

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This commit is contained in:
Tao Wen 2017-06-17 17:14:34 +08:00
parent f29fe7407e
commit 50e4910c63
3 changed files with 64 additions and 18 deletions
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44
example_test.go
View File

@ -45,3 +45,47 @@ func ExampleUnmarshal() {
// Output:
// [{Name:Platypus Order:Monotremata} {Name:Quoll Order:Dasyuromorphia}]
}
func ExampleMarshalWithBestPerformance() {
type ColorGroup struct {
ID int
Name string
Colors []string
}
group := ColorGroup{
ID: 1,
Name: "Reds",
Colors: []string{"Crimson", "Red", "Ruby", "Maroon"},
}
stream := jsoniter.ConfigFastest.BorrowStream(nil)
defer jsoniter.ConfigFastest.ReturnStream(stream)
stream.WriteVal(group)
if stream.Error != nil {
fmt.Println("error:", stream.Error)
}
os.Stdout.Write(stream.Buffer())
// Output:
// {"ID":1,"Name":"Reds","Colors":["Crimson","Red","Ruby","Maroon"]}
}
func ExampleUnmarshalWithBestPerformance() {
var jsonBlob = []byte(`[
{"Name": "Platypus", "Order": "Monotremata"},
{"Name": "Quoll", "Order": "Dasyuromorphia"}
]`)
type Animal struct {
Name string
Order string
}
var animals []Animal
iter := jsoniter.ConfigFastest.BorrowIterator(jsonBlob)
defer jsoniter.ConfigFastest.ReturnIterator(iter)
iter.ReadVal(&animals)
if iter.Error != nil {
fmt.Println("error:", iter.Error)
}
fmt.Printf("%+v", animals)
// Output:
// [{Name:Platypus Order:Monotremata} {Name:Quoll Order:Dasyuromorphia}]
}

24
feature_config.go
View File

@ -149,8 +149,8 @@ func (cfg *frozenConfig) CleanEncoders() {
}
func (cfg *frozenConfig) MarshalToString(v interface{}) (string, error) {
stream := cfg.borrowStream()
defer cfg.returnStream(stream)
stream := cfg.BorrowStream(nil)
defer cfg.ReturnStream(stream)
stream.WriteVal(v)
if stream.Error != nil {
return "", stream.Error
@ -159,8 +159,8 @@ func (cfg *frozenConfig) MarshalToString(v interface{}) (string, error) {
}
func (cfg *frozenConfig) Marshal(v interface{}) ([]byte, error) {
stream := cfg.borrowStream()
defer cfg.returnStream(stream)
stream := cfg.BorrowStream(nil)
defer cfg.ReturnStream(stream)
stream.WriteVal(v)
if stream.Error != nil {
return nil, stream.Error
@ -174,8 +174,8 @@ func (cfg *frozenConfig) Marshal(v interface{}) ([]byte, error) {
func (cfg *frozenConfig) UnmarshalFromString(str string, v interface{}) error {
data := []byte(str)
data = data[:lastNotSpacePos(data)]
iter := cfg.borrowIterator(data)
defer cfg.returnIterator(iter)
iter := cfg.BorrowIterator(data)
defer cfg.ReturnIterator(iter)
iter.ReadVal(v)
if iter.head == iter.tail {
iter.loadMore()
@ -192,8 +192,8 @@ func (cfg *frozenConfig) UnmarshalFromString(str string, v interface{}) error {
func (cfg *frozenConfig) UnmarshalAnyFromString(str string) (Any, error) {
data := []byte(str)
data = data[:lastNotSpacePos(data)]
iter := cfg.borrowIterator(data)
defer cfg.returnIterator(iter)
iter := cfg.BorrowIterator(data)
defer cfg.ReturnIterator(iter)
any := iter.ReadAny()
if iter.head == iter.tail {
iter.loadMore()
@ -209,8 +209,8 @@ func (cfg *frozenConfig) UnmarshalAnyFromString(str string) (Any, error) {
func (cfg *frozenConfig) UnmarshalAny(data []byte) (Any, error) {
data = data[:lastNotSpacePos(data)]
iter := cfg.borrowIterator(data)
defer cfg.returnIterator(iter)
iter := cfg.BorrowIterator(data)
defer cfg.ReturnIterator(iter)
any := iter.ReadAny()
if iter.head == iter.tail {
iter.loadMore()
@ -226,8 +226,8 @@ func (cfg *frozenConfig) UnmarshalAny(data []byte) (Any, error) {
func (cfg *frozenConfig) Unmarshal(data []byte, v interface{}) error {
data = data[:lastNotSpacePos(data)]
iter := cfg.borrowIterator(data)
defer cfg.returnIterator(iter)
iter := cfg.BorrowIterator(data)
defer cfg.ReturnIterator(iter)
typ := reflect.TypeOf(v)
if typ.Kind() != reflect.Ptr {
// return non-pointer error

14
feature_pool.go
View File

@ -1,16 +1,18 @@
package jsoniter
func (cfg *frozenConfig) borrowStream() *Stream {
import "io"
func (cfg *frozenConfig) BorrowStream(writer io.Writer) *Stream {
select {
case stream := <-cfg.streamPool:
stream.Reset(nil)
stream.Reset(writer)
return stream
default:
return NewStream(cfg, nil, 512)
return NewStream(cfg, writer, 512)
}
}
func (cfg *frozenConfig) returnStream(stream *Stream) {
func (cfg *frozenConfig) ReturnStream(stream *Stream) {
select {
case cfg.streamPool <- stream:
return
@ -19,7 +21,7 @@ func (cfg *frozenConfig) returnStream(stream *Stream) {
}
}
func (cfg *frozenConfig) borrowIterator(data []byte) *Iterator {
func (cfg *frozenConfig) BorrowIterator(data []byte) *Iterator {
select {
case iter := <- cfg.iteratorPool:
iter.ResetBytes(data)
@ -29,7 +31,7 @@ func (cfg *frozenConfig) borrowIterator(data []byte) *Iterator {
}
}
func (cfg *frozenConfig) returnIterator(iter *Iterator) {
func (cfg *frozenConfig) ReturnIterator(iter *Iterator) {
select {
case cfg.iteratorPool <- iter:
return