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From Stephen Green <eelstretch...@gmail.com>
Subject Re: Lucene Concurrent Search
Date Fri, 06 Sep 2013 18:04:24 GMT
Something like:

public class SearchListener implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent sce) {

        ServletContext sc = sce.getServletContext();
        String indexDir = sc.getInitParameter("indexDir");
        SearcherManager searcherManager = new
SearcherManager(FSDirectory.open(new File(indexDir)), null);
        sc.setAttribute("searcherManager", searcherManager);
   }

   public void contextDestroyed(ServletContextEvent sce) {
        ServletContext sc = sce.getServletContext();

        SearcherManager searcherManager = (SearcherManager)
sc.getAttribute("searcherManager");
        if(searcherManager != null) {
            try {
                searcherManager.close();
            } catch(IOException ex) {
                logger.log(Level.SEVERE, String.format(
                        "Error shutting down search engine"), ex);
            }
        }
    }
}

Usually does the trick.  You need to put some parameters ("indexDir") into
your web.xml and make sure that it knows that SearchListener is a
ServletListener for your Web app.

But, to re-iterate what someone else said: if you really just want RESTful
search, you might be better off with Solr.



On Thu, Sep 5, 2013 at 6:21 PM, David Miranda <david.b.miranda@gmail.com>wrote:

> 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
>



-- 
Stephen Green
http://thesearchguy.wordpress.com

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