static

in feline/src/main/java/com/spotify/feline/Feline.java [195:237]

• 29 lines of code
• 2 McCabe index (conditional complexity)

  static {
    final Instrumentation instrumentation = ByteBuddyAgent.install();

    try {
      BytecodeUtils.injectBootstrapClasses(
          instrumentation, Feline.class.getName().replace('.', '/') + "Runtime");
    } catch (IOException e) {
      throw new RuntimeException("Failed to inject Feline runtime", e);
    }

    new AgentBuilder.Default()
        .with(new ThreadLocalCircularityLock())
        .with(AgentBuilder.RedefinitionStrategy.RETRANSFORMATION)
        .with(AgentBuilder.TypeStrategy.Default.DECORATE)
        .with(AgentBuilder.InitializationStrategy.NoOp.INSTANCE)
        // note: for debugging, it may help to remove .withErrorsOnly()
        .with(AgentBuilder.Listener.StreamWriting.toSystemError().withErrorsOnly())

        // Do not ignore JDK classes
        .ignore(ElementMatchers.nameStartsWith("com.intellij.rt."))

        // instrument CompletableFuture
        .type(ElementMatchers.is(CompletableFuture.class))
        .transform(FelineTransformer.forCompletableFuture())
        .asTerminalTransformation()

        // instrument all subtypes of Future, except for CompletableFuture (as the above
        // transformation is terminal)
        .type(ElementMatchers.isSubTypeOf(Future.class))
        .transform(FelineTransformer.forFuture())
        .asTerminalTransformation()

        // Instrument allowed/disallowed methods
        .type(allowancesTransformer)
        .transform(allowancesTransformer)
        .asTerminalTransformation()

        // instrument ThreadLocal
        .type(ElementMatchers.isSubTypeOf(ThreadLocal.class))
        .transform(FelineThreadLocalTransformer.forThreadLocal())
        .asTerminalTransformation()
        .installOn(instrumentation);
  }