fix(protocol/dubbo): remove shared versionInt map state

- remove package-level versionInt maps in dubbo impl and hessian2 response paths
- compute version int per call to avoid shared mutable/global state
- add concurrent isSupportResponseAttachment tests in both packages

Fixes: #3247

Author: xxs588

protocol/dubbo/hessian2/hessian_response.go

@@ -402,8 +402,6 @@ func ReflectResponse(in any, out any) error {
 	return nil
 }
 
-var versionInt = make(map[string]int)
-
 // https://github.com/apache/dubbo/blob/dubbo-2.7.1/dubbo-common/src/main/java/org/apache/dubbo/common/Version.java#L96
 // isSupportResponseAttachment is for compatibility among some dubbo version
 func isSupportResponseAttachment(ver any) bool {
@@ -412,12 +410,9 @@ func isSupportResponseAttachment(ver any) bool {
 		return false
 	}
 
-	v, ok := versionInt[version]
-	if !ok {
-		v = version2Int(version)
-		if v == -1 {
-			return false
-		}
+	v := version2Int(version)
+	if v == -1 {
+		return false
 	}
 
 	if v >= 2001000 && v <= 2060200 { // 2.0.10 ~ 2.6.2

protocol/dubbo/hessian2/hessian_response_test.go

@@ -19,6 +19,7 @@ package hessian2
 
 import (
 	"reflect"
+	"sync"
 	"testing"
 )
 
@@ -187,6 +188,23 @@ func TestIsSupportResponseAttachment(t *testing.T) {
 	assert.True(t, is)
 }
 
+func TestIsSupportResponseAttachmentConcurrent(t *testing.T) {
+	versions := []any{"2.X", "2.0.10", "2.5.3", "2.6.2", "2.0.2", "2.7.2", ""}
+	var wg sync.WaitGroup
+
+	for i := 0; i < 200; i++ {
+		for _, version := range versions {
+			wg.Add(1)
+			go func(v any) {
+				defer wg.Done()
+				_ = isSupportResponseAttachment(v)
+			}(version)
+		}
+	}
+
+	wg.Wait()
+}
+
 func TestVersion2Int(t *testing.T) {
 	v := version2Int("2.1.3")
 	assert.Equal(t, 2010300, v)

protocol/dubbo/impl/hessian.go

@@ -163,21 +163,16 @@ func marshalRequest(encoder *hessian.Encoder, p DubboPackage) ([]byte, error) {
 	return encoder.Buffer(), err
 }
 
-var versionInt = make(map[string]int)
-
 // https://github.com/apache/dubbo/blob/dubbo-2.7.1/dubbo-common/src/main/java/org/apache/dubbo/common/Version.java#L96
 // isSupportResponseAttachment is for compatibility among some dubbo version
 func isSupportResponseAttachment(version string) bool {
 	if version == "" {
 		return false
 	}
 
-	v, ok := versionInt[version]
-	if !ok {
-		v = version2Int(version)
-		if v == -1 {
-			return false
-		}
+	v := version2Int(version)
+	if v == -1 {
+		return false
 	}
 
 	if v >= 2001000 && v <= 2060200 { // 2.0.10 ~ 2.6.2

protocol/dubbo/impl/hessian_test.go

@@ -19,6 +19,7 @@ package impl
 
 import (
 	"errors"
+	"sync"
 	"testing"
 	"time"
 )
@@ -329,6 +330,23 @@ func TestIsSupportResponseAttachment(t *testing.T) {
 	})
 }
 
+func TestIsSupportResponseAttachmentConcurrent(t *testing.T) {
+	versions := []string{"", "2.0.10", "2.6.2", "2.7.0", "3.0.0", "invalid"}
+	var wg sync.WaitGroup
+
+	for i := 0; i < 200; i++ {
+		for _, version := range versions {
+			wg.Add(1)
+			go func(v string) {
+				defer wg.Done()
+				_ = isSupportResponseAttachment(v)
+			}(version)
+		}
+	}
+
+	wg.Wait()
+}
+
 func TestMarshalRequestWithTypedNilPointer(t *testing.T) {
 	encoder := hessian.NewEncoder()
 	pkg := DubboPackage{