feat: add Writer pool

jx.go

@@ -19,6 +19,11 @@ var (
 			return &Encoder{}
 		},
 	}
+	writerPool = &sync.Pool{
+		New: func() interface{} {
+			return &Writer{}
+		},
+	}
 	decPool = &sync.Pool{
 		New: func() interface{} {
 			return &Decoder{}
@@ -48,3 +53,14 @@ func PutEncoder(e *Encoder) {
 	e.SetIdent(0)
 	encPool.Put(e)
 }
+
+// GetWriter returns *Writer from pool.
+func GetWriter() *Writer {
+	return writerPool.Get().(*Writer)
+}
+
+// PutWriter puts *Writer to pool
+func PutWriter(e *Writer) {
+	e.Reset()
+	writerPool.Put(e)
+}

otel_test.go

@@ -327,14 +327,17 @@ func BenchmarkOTEL(b *testing.B) {
 		}
 	})
 	b.Run("Write", func(b *testing.B) {
+		w := GetWriter()
+		defer PutWriter(w)
+		v.Write(w)
+
 		b.ReportAllocs()
-		var w Writer
-		v.Write(&w)
 		b.SetBytes(int64(len(w.Buf)))
+		b.ResetTimer()
 
 		for i := 0; i < b.N; i++ {
 			w.Reset()
-			v.Write(&w)
+			v.Write(w)
 		}
 	})
 	b.Run("Encode", func(b *testing.B) {

w_test.go

@@ -7,14 +7,16 @@ import (
 )
 
 func TestWriter_Reset(t *testing.T) {
-	var w Writer
+	w := GetWriter()
+	defer PutWriter(w)
 	w.True()
 	require.NotEmpty(t, w.Buf)
 	w.Reset()
 	require.Empty(t, w.Buf)
 }
 
 func TestWriter_String(t *testing.T) {
-	w := Writer{Buf: []byte(`true`)}
+	w := GetWriter()
+	defer PutWriter(w)
 	require.Equal(t, "true", w.String())
 }