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Java Forum / General / May 2008jsp sharing problem
I am writing a program using lucene, and lucene need to create a IndexSearcher Object. This object is recommeded to be created once, how to share one instance between all jsp pages, and is there a place for global initialization and set some objects for sharing in jsp? > I am writing a program using lucene, and lucene need to create a > IndexSearcher Object. This object is recommeded to be created once, > how to share one instance between all jsp pages, and is there a place > for global initialization and set some objects for sharing in jsp? You could save it in application object - or use a singleton. Arne > joeh...@gmail.com wrote: > > I am writing a program using lucene, and lucene need to create a [quoted text clipped - 5 lines] > > Arne Thanks > I am writing a program using lucene, and lucene need to create a > IndexSearcher Object. This object is recommeded to be created once, > how to share one instance between all jsp pages, and is there a place > for global initialization and set some objects for sharing in jsp? You should extract your "business" logic out of the JSP and put it into real Java code, possibly using the MVC pattern... JSPs should be used only to render, not "think". You can use Spring MVC to help set up your application... If you do use spring, you can pass one instance of the lucene indexer to all of the controller classes than need it. The other thing you can do is externalize the lucene index, possibly via solr, which is a web-service shell that uses lucene to manage document search.  SignatureDaniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> > The other thing you can do is externalize the lucene index, possibly via > solr, which is a web-service shell that uses lucene to manage document > search. ---(HTTP)---JSP---(HTTP)---web service looks like a classic anti-pattern ... Arne >> The other thing you can do is externalize the lucene index, possibly >> via solr, which is a web-service shell that uses lucene to manage [quoted text clipped - 5 lines] > > Arne Actually, a flow like this looks pretty reasonable to me. User Request Servlet Controller Data Access Web Service --+-----(http)----->| | | | | |-(Method)->| | | | | |---(Method)-->| | | | | |-----(http)->| | | | |<------------| | | |<-------------| | | | |--(jsp)->View | | <---------------------------------------------/ | | It's called multi layered architecture, and the underlying protocols (http vs method, etc...) are irrelevant, or at the very most minor implementation details. SignatureDaniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> On May 12, 2:31 pm, Daniel Pitts <newsgroup.spamfil...@virtualinfinity.net> wrote: > >> The other thing you can do is externalize the lucene index, possibly > >> via solr, which is a web-service shell that uses lucene to manage [quoted text clipped - 24 lines] > -- > Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> Yes, this picture is very clear. Framework like Spring and Struts do their jobs in this way. My problem is really very simple, I just want to find a place to initialize my app before any jsp page is requested. It is not a big bussiness project, and I just use pure jsp. I found my solution by using setting the web.xml. I write a Servlet and set it load-on-startup, which tells the server to run it when the app starts, and I can then do my jobs there. It works well. And Spring also works in this way. Thanks again. Joe >>> The other thing you can do is externalize the lucene index, possibly >>> via solr, which is a web-service shell that uses lucene to manage [quoted text clipped - 3 lines] >> >> looks like a classic anti-pattern ... > Actually, a flow like this looks pretty reasonable to me. > [quoted text clipped - 11 lines] > (http vs method, etc...) are irrelevant, or at the very most minor > implementation details. I do not have a problem with the multi-layered design for this. I have a problem with the multi-tiered design for this. Using HTTP instead of in-JVM calls or even a binary protocol has a huge impact on performance. And it is a classic anti-pattern. If you happen to own or have access to Fowler "Patterns of Enterprise Application Architecture", then check chapter 7. Arne >>>> The other thing you can do is externalize the lucene index, possibly >>>> via solr, which is a web-service shell that uses lucene to manage [quoted text clipped - 31 lines] > If you happen to own or have access to Fowler "Patterns of > Enterprise Application Architecture", then check chapter 7. An somewhat related: it is a key point in good SOA to expose the business logic layer as a service and not the data access layer. Arne On May 11, 11:26 pm, Daniel Pitts <newsgroup.spamfil...@virtualinfinity.net> wrote: > joeh...@gmail.com wrote: > > I am writing a program using lucene, and lucene need to create a [quoted text clipped - 16 lines] > -- > Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> What troubles me is that I don't know the right place to initialize my application I do put most of logics in real java code, but these code are invoked by users'reqest, and I can't find a place to start my application. Singletion is a good idea, but I just find I cannot read config.xml rightly, because the default directory is tomcat bin, so wierd. Spring is good, but what I need is really not that big. Thanks for your reply. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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