On Thu, May 24, 2007 at 08:13:20AM -0500, Patrick R. Michaud wrote:
> On Thu, May 24, 2007 at 10:13:24AM +0200, Christophe David wrote:
> > If I want to have the files imported as soon as possible, is there a
> > drawback in setting $ImportFreq=1 knowing that pages are only imported
> > once ?
>
> Setting $ImportFreq to 1 or some other low value will mean
> that the import/ directory will be scanned for new files
> (and the .lastimport file updated) on virtually _every_
> browse request. It's entirely up to the site admin to
> decide if that's reasonable for the server.
Following up to my previous post, I should go ahead and
outline the other ways to get things imported quickly
without setting $ImportFreq to a low value. First,
recall that...
> The recipe detects that the import/ directory has changed by
> simply comparing the last modification time of the directory with
> the last modification time of the .lastimport file. If the
> import/ directory has a later timestamp, then we know that
> _something_ has happened and so we need to check it for new
> import files.
So, the key to getting things imported "as soon as possible"
is to make sure the last modification time of the import/
directory changes somehow when there's something new to be
imported. Here are a few possibilities:
1. When an external program is about to write a new text file
in the import/ directory, make sure it first removes any
existing file of the same name. This will cause the
timestamp of the import/ directory to update when the
new file is created.
2. Give PmWiki write permission to the import/ directory.
If PmWiki has write permission to the import/ directory,
then it will rename any files it imports to include a
time marker in the name. As a result, any new files
placed in the import/ directory will automatically cause
the directory's timestamp to change. The InputText
script will see this on the very next browse request and
start processing the files in the import/ directory.
3. When an external program modifies a file in the import/
directory, also have it briefly "touch" the import/
directory itself. On Unix-like systems there's a touch(1)
command that does this:
touch import
In PHP there's a touch() function that does a similar thing.
4. One can also update the directory's last modified time by
quickly creating and removing a temporary file in that
directory.
Hope some of these are useful.
Pm
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