From 4d5571e1d3c0548943f8cad70300719e62a447b8 Mon Sep 17 00:00:00 2001
From: Frederic BIDON <fredbi@yahoo.com>
Date: Wed, 10 Jan 2024 15:30:01 +0100
Subject: [PATCH] added pool for internal maps

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>
---
 schema.go | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/schema.go b/schema.go
index 6936ad6..92e71c3 100644
--- a/schema.go
+++ b/schema.go
@@ -17,6 +17,7 @@ package spec
 import (
 	"fmt"
 	"strings"
+	"sync"
 
 	"github.com/go-openapi/jsonpointer"
 	"github.com/go-openapi/swag"
@@ -131,7 +132,10 @@ func (r SchemaURL) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON unmarshal this from JSON
 func (r *SchemaURL) UnmarshalJSON(data []byte) error {
-	var v map[string]interface{}
+	v := poolOfMaps.BorrowMap()
+	defer func() {
+		poolOfMaps.RedeemMap(v)
+	}()
 	if err := json.Unmarshal(data, &v); err != nil {
 		return err
 	}
@@ -610,7 +614,11 @@ func (s *Schema) UnmarshalJSON(data []byte) error {
 		SwaggerSchemaProps: props.SwaggerSchemaProps,
 	}
 
-	var d map[string]interface{}
+	//var d map[string]interface{}
+	d := poolOfMaps.BorrowMap()
+	defer func() {
+		poolOfMaps.RedeemMap(d)
+	}()
 	if err := json.Unmarshal(data, &d); err != nil {
 		return err
 	}
@@ -643,3 +651,29 @@ func (s *Schema) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
+
+type mapPool struct {
+	*sync.Pool
+}
+
+var poolOfMaps = mapPool{
+	Pool: &sync.Pool{
+		New: func() any {
+			return make(map[string]any)
+		},
+	},
+}
+
+func (p mapPool) BorrowMap() map[string]any {
+	m := p.Get().(map[string]any)
+	// go1.21 clear(m)
+	for k := range m {
+		delete(m, k)
+	}
+
+	return m
+}
+
+func (p mapPool) RedeemMap(m map[string]any) {
+	p.Put(m)
+}