releasable writer

common/io/writer.go

@@ -3,6 +3,7 @@ package io
 import (
 	"io"
 
+    "github.com/v2ray/v2ray-core/common"
 	"github.com/v2ray/v2ray-core/common/alloc"
 )
 
@@ -12,6 +13,11 @@ type Writer interface {
 	Write(*alloc.Buffer) error
 }
 
+type ReleasableWriter interface {
+    Writer
+    common.Releasable
+}
+
 // AdaptiveWriter is a Writer that writes alloc.Buffer into underlying writer.
 type AdaptiveWriter struct {
 	writer io.Writer