pjfanning commented on code in PR #539:
URL: https://github.com/apache/pekko-http/pull/539#discussion_r1576837896


##########
http-core/src/main/scala/org/apache/pekko/http/impl/engine/http2/hpack/ByteStringInputStream.scala:
##########
@@ -24,13 +27,29 @@ import pekko.util.ByteString.ByteString1C
 @InternalApi
 private[http2] object ByteStringInputStream {
 
-  def apply(bs: ByteString): InputStream =
-    bs match {
-      case cs: ByteString1C =>
-        // TODO optimise, ByteString needs to expose InputStream (esp if array 
backed, nice!)
-        new ByteArrayInputStream(cs.toArrayUnsafe())
-      case _ =>
-        // NOTE: We actually measured recently, and compact + use array was 
pretty good usually
-        apply(bs.compact)
+  private lazy val byteStringInputStreamMethodTypeOpt = Try {
+    val lookup = MethodHandles.publicLookup()
+    val inputStreamMethodType = MethodType.methodType(classOf[InputStream])
+    lookup.findVirtual(classOf[ByteString], "asInputStream", 
inputStreamMethodType)
+  }.toOption
+
+  def apply(bs: ByteString): InputStream = bs match {
+    case cs: ByteString1C =>
+      new ByteArrayInputStream(cs.toArrayUnsafe())

Review Comment:
   https://github.com/pjfanning/pekko-test/tree/instanceof -- this branch is 
slower than the main branch - the instanceof is slower than the pattern matching



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