@NonNull
    static List<String> splitListStringToStringList(@Nullable String listString) {
        final List<String> ret = new ArrayList<>();
        if (listString == null || listString.trim().length() == 0) return ret;

        final String[] split = listString.trim().split("\\s*\\|\\s*");
        for (String s : split) {
            if (s.length() == 0) continue;

            ret.add(s);
        }

        return ret;
    }
Split String {@code "v1|v2|v3"} to String List({@code [v1, v2, v3]}).
ttl-agent/src/main/java/com/alibaba/ttl3/agent/TtlAgentHelper.java