encapsulate virtual field use in util class

Author: laurit

instrumentation/akka/akka-http-10.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/akkahttp/server/route/PathMatcherInstrumentation.java

@@ -40,7 +40,7 @@ public static void onEnter(
         @Advice.Argument(0) Uri.Path prefix, @Advice.Return PathMatcher<?> result) {
       // store the path being matched inside a VirtualField on the given matcher, so it can be used
       // for constructing the route
-      VirtualFields.PATH_MATCHER_ROUTE.set(result, prefix.toString());
+      PathMatcherUtil.setMatched(result, prefix.toString());
     }
   }
 }

instrumentation/akka/akka-http-10.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/akkahttp/server/route/PathMatcherStaticInstrumentation.java

@@ -47,7 +47,7 @@ public static void onExit(
         }
         // if present use the matched path that was remembered in PathMatcherInstrumentation,
         // otherwise just use a *
-        String prefix = VirtualFields.PATH_MATCHER_ROUTE.get(pathMatcher);
+        String prefix = PathMatcherUtil.getMatched(pathMatcher);
         if (prefix == null) {
           if (PathMatchers.Slash$.class == pathMatcher.getClass()) {
             prefix = "/";

instrumentation/akka/akka-http-10.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/akkahttp/server/route/PathMatcherUtil.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.javaagent.instrumentation.akkahttp.server.route;
+
+import akka.http.scaladsl.server.PathMatcher;
+import io.opentelemetry.instrumentation.api.util.VirtualField;
+
+public class PathMatcherUtil {
+
+  private static final VirtualField<PathMatcher<?>, String> PATH_MATCHER_ROUTE =
+      VirtualField.find(PathMatcher.class, String.class);
+
+  public static void setMatched(PathMatcher<?> matcher, String route) {
+    PATH_MATCHER_ROUTE.set(matcher, route);
+  }
+
+  public static String getMatched(PathMatcher<?> matcher) {
+    return PATH_MATCHER_ROUTE.get(matcher);
+  }
+
+  private PathMatcherUtil() {}
+}