Forum OpenACS Q&A: acs-lang problem! needed help

I have found a weird behaviour in lang::user::set_locale and need help and suggestion.

I am running a tri-lingual site that would switch languages between English, Simplified Chinese and Traditaional Chinese. I use /acs-lang/change-locale?user_locale=$locale&return_url=$path to switch language. Mostly the page can be changed but occassionally the browser has no effect on the language change.

I tracked the code of lang::user::set_locale in acs-lang/tcl/locale-procs.tcl and put ns_log mark and found that the line "util_memoize_flush [list lang::user::site_wide_locale_not_cached $user_id]" seems not to be excuted (I put some log mark insdie lang::user::site_wide_locale_not_cached but not displayed).

This problem is persisted that the weird response will not disappeared once it happened on a particular browser and PC until the cookie was removed. But it would appear sometimes later in unpredictable manner.

I use OpenACS 4.6 and the code snippet in acs-lang/tcl/locale-procs.tcl for your reference at the end of this post.

Thank you for any suggestion.

Kevin

++++++++++++++ code +++++++++++++++++++
ad_proc -public lang::user::set_locale {
    {-package_id ""}
    locale
} {
    set user_id [ad_conn user_id]

    if { $user_id == 0 } {
        # Not logged in, use a cookie-based client locale
        ad_set_cookie -replace t -max_age inf "ad_locale" $locale

        # Flush the site-wide user preference cache
        util_memoize_flush [list lang::user::site_wide_locale_not_cached $user_id]
        return
    }
...
...

More detail can be given to the caes
1. For the case of the problem happened, the user_id is equal to 0, ie. not-login user. I have no idea if login user would have the problem. But not login user has problem and I am trying to narrow down the case first.

So I guess moving util_memoize_flush may not help the case.

2. The problem happened in both Firefox and IE. And I found that I can change the cookie ad_locale correct but the expiry time is infinte. I have two other cookies that one is session_id with 2 hour life time and one is ad_user_login with infinte lifetime.

Or should I disable memoize cache?

Thank you.

Kevin