Hi Paul, thanks for your reply. I compared your source code and it seems that you are using the same mechanism for the singleton like me... I am using lucene 2.4 and get the exception above explained. I am wondering why because I only create an instance of my lucene object (which itself constructs an IndexReader/IndexWriter in its constructor) and return this instance to objects which want to execute some lucene operations. So I only applied the singleton-pattern. I am still wondering why these pattern results in my exception. Why could it happen, that these Streams (IndexWriter/IndexReader) close itself. In my opinion it is completely legal to do so.
Any other suggestions? polx wrote: > > > Le 15-déc.-08 à 13:09, Zender00 a écrit : >> in my opinion it is possible to use a reader and writer >> simultanesously on >> the same index. In my already working lucene class, I use they are >> both open >> all the time. > > mmmh... > >> But this isnt the reason for my exception. It seems that lucene cannot >> handle my singleton. How did you implement your singleton with >> lucene? Which >> lucene version? > > 2.3.1, source code APL and GPL at: > http://svn.activemath.org/intergeo/Platform/SearchI2G/index/ > > in another project, this was used with Lucene 2.0. > > paul > >> polx wrote: >>> >>> We use singletons all the time, >>> >>> Just be careful that are writer and a reader cannot be opened >>> simultaneously on the same index. Either you write or your read (and >>> delete). >>> >>> paul >>> >>> >>> Le 15-déc.-08 à 12:06, Zender00 a écrit : >>> >>>> >>>> I extend my original post: >>>> How is it possible to use lucene in 2 diffent classes / objects, if >>>> I dont >>>> want to use static methods/variables? >>>> (one object read/writer, the other is read only) >>>> >>>> Kind regards, >>>> D. Penning >>>> >>>> Zender00 wrote: >>>>> >>>>> Hi, >>>>> I tried to implement a singleton pattern for my already working >>>>> lucene >>>>> object. >>>>> But there is a strange error when I tried to access the instance. >>>>> >>>>> When my Singleton GetInstance() method is executed for the first >>>>> time it >>>>> creates a new instance of my lucene object. There are some member >>>>> variables in this object like an IndexWriter and IndexReader. These >>>>> objects are created in the constructor and I can access them >>>>> directly in >>>>> the constructor successfully. >>>>> GetInstance() now returns this lucene object and I have to execute >>>>> some >>>>> operations on it. But the IndexWriter seems to be closed meanwhile >>>>> and I >>>>> got the exception: >>>>> >>>>> "org.apache.lucene.store.AlreadyClosed Exception: this >>>>> IndexWriter is >>>>> closed" when my object tries to writer some documents. >>>>> >>>>> How could this happen? Isn't it possible to use lucene with a >>>>> singleton-pattern? >>>>> >>>>> Kind regards, >>>>> D. Penning >>>>> >>>> >>>> -- >>>> View this message in context: >>>> http://www.nabble.com/Singleton-and-Lucene%3A-org.apache.lucene.store.AlreadyClosed-tp20983056p21011945.html >>>> Sent from the Lucene - Java Users mailing list archive at >>>> Nabble.com. >>>> >>>> >>>> --------------------------------------------------------------------- >>>> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >>>> For additional commands, e-mail: java-user-h...@lucene.apache.org >>>> >>> >>> >>> >>> >> >> -- >> View this message in context: >> http://www.nabble.com/Singleton-and-Lucene%3A-org.apache.lucene.store.AlreadyClosed-tp20983056p21012798.html >> Sent from the Lucene - Java Users mailing list archive at Nabble.com. >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >> For additional commands, e-mail: java-user-h...@lucene.apache.org >> > > > > -- View this message in context: http://www.nabble.com/Singleton-and-Lucene%3A-org.apache.lucene.store.AlreadyClosed-tp20983056p21022920.html Sent from the Lucene - Java Users mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
