content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.akkahttp.server.route;
  
  import static net.bytebuddy.matcher.ElementMatchers.namedOneOf;
  
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class PathConcatenationInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return namedOneOf(
          "akka.http.scaladsl.server.PathMatcher$$anonfun$$tilde$1",
          "akka.http.scaladsl.server.PathMatcher");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          namedOneOf("apply", "$anonfun$append$1"), this.getClass().getName() + "$ApplyAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class ApplyAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter() {
        // https://github.com/akka/akka-http/blob/0fedb87671ecc450e7378713105ea1dc1d9d0c7d/akka-http/src/main/scala/akka/http/scaladsl/server/PathMatcher.scala#L43
        // https://github.com/akka/akka-http/blob/0fedb87671ecc450e7378713105ea1dc1d9d0c7d/akka-http/src/main/scala/akka/http/scaladsl/server/PathMatcher.scala#L47
        // when routing dsl uses path("path1" / "path2") we are concatenating 3 segments "path1" and /
        // and "path2" we need to notify the matcher that a new segment has started, so it could be
        // captured in the route
        AkkaRouteHolder.startSegment();
      }
    }
  }
  