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From David Miranda <david.b.mira...@gmail.com>
Subject Re: Lucene Concurrent Search
Date Thu, 05 Sep 2013 22:21:19 GMT
Did you have a practical example of the use of SearchManager (initialize,
use to do research)?

Thanks in advance.


2013/9/5 Stephen Green <eelstretching@gmail.com>

> You can implement a ServletListener for your app and open the index there
> (in the contextInitialized method). You can then create the SearcherManager
> from the IndexReader/Searcher and store it in the ServletContext, where it
> can be fetched out by your REST servlets.
>
> This is a typical pattern that we use for lots of Web apps that use
> resources like Lucene.
>
>
> On Thu, Sep 5, 2013 at 12:05 PM, Ian Lea <ian.lea@gmail.com> wrote:
>
> > I use a singleton class but there are other ways in tomcat.  Can't
> > remember what - maybe application scope.
> >
> >
> > --
> > Ian.
> >
> >
> > On Thu, Sep 5, 2013 at 4:46 PM, David Miranda <david.b.miranda@gmail.com
> >
> > wrote:
> > > Where I can initialize the SearchManager variable to after use it in
> the
> > > REST servlet to do research in the index?
> > >
> > >
> > > 2013/9/5 Ian Lea <ian.lea@gmail.com>
> > >
> > >> I think that blog post was bleeding edge and the API changed a bit
> > >> subsequently.
> > >>
> > >> I use
> > >>
> > >> Directory dir = whatever;
> > >> SearcherManager sm = new SearcherManager(dir, new SearcherFactory());
> > >>
> > >> to get default behaviour.  The javadocs for SearcherFactory explain
> > >> that you can write your own implementation if you want custom
> > >> behaviour such as warming.
> > >>
> > >>
> > >> --
> > >> Ian.
> > >>
> > >>
> > >> On Thu, Sep 5, 2013 at 3:53 PM, David Miranda <
> > david.b.miranda@gmail.com>
> > >> wrote:
> > >> > Hi,
> > >> >
> > >> > I'm trying to implement my code with SearchManager to make  my app
> > >> > thread-safe. I'm follow this post:
> > >> >
> > >>
> >
> http://blog.mikemccandless.com/2011/09/lucenes-searchermanager-simplifies.html
> > >> >
> > >> > There is a class that implements "SearchWarmer". I can't find this
> > class
> > >> in
> > >> > the Lucene library, what class is that?
> > >> >
> > >> > Thanks.
> > >> >
> > >> >
> > >> > 2013/9/5 Aditya <findbestopensource@gmail.com>
> > >> >
> > >> >> Hi
> > >> >>
> > >> >> You want to use REST service for your search, then my advice would
> > be to
> > >> >> use Solr. As it has buitl-in functionality of REST API.
> > >> >>
> > >> >> If you want to use Lucene then below are my comments:
> > >> >> 1. In do search function, you are creating reader object. If this
> > call
> > >> is
> > >> >> invoked for every query then it would be very expensive. You need
> to
> > >> create
> > >> >> it once globally and re opon it, if the index is modified. Its
> better
> > >> use
> > >> >> SearchManager.
> > >> >>
> > >> >> Regards
> > >> >> Aditya
> > >> >> www.findbestopensource.com - Search from 1 Million open source
> > >> projects.
> > >> >>
> > >> >>
> > >> >>
> > >> >> On Thu, Sep 5, 2013 at 6:46 AM, David Miranda <
> > >> david.b.miranda@gmail.com
> > >> >> >wrote:
> > >> >>
> > >> >> > Hi,
> > >> >> >
> > >> >> > I'm developing a web application, that contains a REST service
in
> > the
> > >> >> > Tomcat, that receives several requests per second.
> > >> >> > The REST requests do research in a Lucene index, to do this
i use
> > the
> > >> >> > IndexSearch.
> > >> >> >
> > >> >> > My questions are:
> > >> >> > - There are concurrency problems in multiple research?
> > >> >> > - What the best design pattern to do this?
> > >> >> >
> > >> >> > public class IndexResearch(){
> > >> >> > >   private static int MAX_HITS = 500;
> > >> >> > >   private static String DIRECTORY = "indexdir";
> > >> >> > >   private IndexSearcher searcher;
> > >> >> > >   private StandardAnalyzer analyzer;
> > >> >> > >
> > >> >> >
> > >> >> >
> > >> >> >
> > >> >> > >   public IndexResearch(){
> > >> >> > >   }
> > >> >> > >   public String doSearch(String text){
> > >> >> > >      analyzer = new StandardAnalyzer(Version.LUCENE_43);
> > >> >> > >      topic = QueryParser.escape(topic);
> > >> >> > >      Query q = new QueryParser(Version.LUCENE_43, "field",
> > analyzer
> > >> >> > > ).parse(text);
> > >> >> > >      File indexDirectory = new File(DIRECTORY);
> > >> >> > >      IndexReader reader;
> > >> >> > >      reader =
> > >> DirectoryReader.open(FSDirectory.open(indexDirectory));
> > >> >> > >      searcher = new IndexSearcher(reader);
> > >> >> > >
> > >> >> >         /*more code*/
> > >> >> >
> > >> >> > >    }
> > >> >> > > }
> > >> >> >
> > >> >> >
> > >> >> > Can I create, in the servlet, one object of this class per
client
> > >> request
> > >> >> > (Is that the best design pattern)?
> > >> >> >
> > >> >> > Thanks in advance.
> > >> >> >
> > >> >>
> > >> >
> > >> >
> > >> >
> > >> > --
> > >> > Cumprimentos,
> > >> > David Miranda
> > >>
> > >> ---------------------------------------------------------------------
> > >> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > >> For additional commands, e-mail: java-user-help@lucene.apache.org
> > >>
> > >>
> > >
> > >
> > > --
> > > Cumprimentos,
> > > David Miranda
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > For additional commands, e-mail: java-user-help@lucene.apache.org
> >
> >
>
>
> --
> Stephen Green
> http://thesearchguy.wordpress.com
>



-- 
Cumprimentos,
David Miranda

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