final Runnable makeContextAware(Runnable task) {
        final RequestContext context = contextOrNull();
        if (context != null) {
            return context.makeContextAware(task);
        }
        return ArmeriaContextPropagation.captureAll().wrap(task);
    }
This won't be referenced until {@link #get()} is called. If there's only one classloader, the
initializer will only be called once.
core/src/main/java/com/linecorp/armeria/common/AbstractContextAwareExecutor.java