Yes, I would use this, especially the IndexReader methods that you suggested.
Otis --- Doug Cutting <[EMAIL PROTECTED]> wrote: > > From: Otis Gospodnetic [mailto:[EMAIL PROTECTED]] > > > > You could try looking for a segments file in the index directory. > > If it exists, the index exists, else it does not. > > > > Is there a better way? > > I think that's currently the best way. But it's not great, because > it > requires applications to know something about the internal structure > of the > index. > > Going forward, I'm hesitant to change the semantics of the 'create' > flag. > I'm also hesitant to add another flag or constructor method. > > Perhaps the addition of the following IndexReader methods would > suffice: > > /** Returns true iff an index exists in the named directory. */ > public static boolean indexExists(String directory); > public static boolean indexExists(File directory); > public static boolean indexExists(Directory directory); > > These are analogous to the 'lastModified' methods. Internally these > would > just check for the existence of the segments file. > > Does that sound like a good plan? > > Another place that currently requires application knowledge of index > structure is failure recovery. Currently if an indexing application > crashes > it may leave .lock files in the directory which must be removed > before the > index can be altered again. Perhaps this can be resolved similarly > by > adding methods like: > > /** Returns true iff the index in the named directory is currently > locked.*/ > public static boolean isLocked(Directory directory); > > /** Forcibly unlocks the index in the named directory. > * Caution: this should only be used by failure recovery code, > * when it is known that no other process or thread is in fact > * currently accessing this index. > */ > public static void unlock(Directory directory); > > We could also have String and File versions for convenience. > > Would folks use something like this? If so, more fodder for the TODO > list! > > Doug > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
