static O hotwire_onCompile; // voidfunc(Pair<jarFile, transpiledSource>)

sbool hotwire_serially;

static Lock hotwire_overInternalBot_lock = lock();

sbool hotwire_compileOnServer;

static Class<?> hotwire_overInternalBot(S progID) {

  ret hotwire_overInternalBot(progID, "main");

}

static Class<?> hotwire_overInternalBot(S progID, S mainClass) {

  ret hotwire_overInternalBot(progID, _ -> mainClass);

}

static Class<?> hotwire_overInternalBot(S progID, IF1<ClassLoader, S> calculateMainClass) ctex {

  Pair<File, S> p;

  try {

    p = hotwire_compile(progID);

  } catch e {

    throw rethrow("Error hotwiring " + progID, e);

  }

  File jar = p.a;

  assertTrue(jar.getAbsolutePath(), jar.isFile());

  L<File> files = hotwire_collectJars(jar);

  // make class loader

  JavaXClassLoader classLoader = hotwire_makeClassLoader(files);

  classLoader.progID = progID;

  S mainClass = calculateMainClass == null ? "main" : calculateMainClass.get(classLoader);

  ret hotwire_finish(classLoader, progID, p.b, mainClass);

}

// returns pair(jar, transpiled src)

static Pair<File, S> hotwire_compile(S progID) {

  Pair<File, S> p = hotwire_compileOnServer && !isLocalSnippetID(progID)

    ? compileSnippetThroughServer(progID)

    : CompilerBot.compileSnippet2(progID);

  lock hotwire_serially ? hotwire_overInternalBot_lock : null;

  callF(hotwire_onCompile, p);

  ret p;

}