Re: Re: Re: Development Framework

Certainly looks cleaner.    Probably use an Observer/Observable
notification when the data is updated  to push the new data to the
client using XMLSocket.

On Sat, 2004-11-06 at 16:07, Ian Pojman wrote:

> wouldn't opening a ServerSocket and using XMLSocket on the flash side
> be most efficient?
> 
> 
> On Fri, 05 Nov 2004 23:45:39 -0500, Stephen Jackson
> <[email protected]> wrote:
> >  I don't know anything but the look and feel of your app. but instead of
> > polling, perhaps this is something to think about.
> >  
> >  Perhaps what you could do is separate out the piece of the application that
> > requires so much communication into it's own .swf.   Then that .swf makes
> > the call to the app to request the potentially modified data. Add the thread
> > that makes the request to a List and notifiy the list when data has been
> > modified,  Add the thread to a List which would own the threadLock to that
> > object.  Then if the data is modified, notify the owner of the list (some
> > sort of JMX component - Singleton). It would update the data, release the
> > threadlock. This way you only have a single thread polling which some sort
> > of thread that owns the list and the original thread lock.
> >  
> >  Based on the type of data you are asking for use the Observer/Observable
> > pattern to push your request on a List until the object is notified of a
> > modification.  Then return the request.
> >  
> >  Apparently the end user must be siting there waiting to see constant
> > changes so it would be constantly connected without constantly asking for
> > the data.(pop up)?
> >  
> >  I attached the working ThreadLock object I have used in the past.  The
> > concept is there.
> >  
> >  Just an idea, would have to prototype it.
> >  
> >  public class RequestDataChange{
> >      private static RequestDataChange = new RequestDataChange();    
> >      private static Notify notify = new Notify();
> >      {
> >          new Thread(notify).run();
> >      }
> >  
> >      //simplify and make a single for the example
> >      //JBOSS JMX components work very well
> >      public static RequestDataChange getInstance(){
> >          return dataChange;
> >      }
> >  
> >      //the request thread would call this method
> >      public waitForUpdate( Data data ){
> >          try{        
> >              notify.addData(Data);
> >              //will block on this until notify thread frees the original
> > thread lock
> >              data.getThreadLock();
> >          }finally{
> >              data.freeThreadLock();
> >          }
> >      }
> >  
> >      //a different thread would update the data
> >      public void updateData( Object object ){
> >             notify.updateData(object);
> >      }
> >  
> >      class Notify implements Runnable {
> >          private List waitingRoom = new ArrayList();
> >  
> >          public void addData( Data data ){
> >                  
> >                  watingRoom.add(data);
> >                  data.getThreadLock();
> >          }   
> >          
> >          public void run(){
> >              //check
> >          }
> >  
> >          public updateData( String key, Object newData ){
> >              //iterate through modifiy the data and release.
> >              Iterator iter = waitingRoom.iterator();
> >              while(){
> >                  //update the data 
> >                  //original thread resumes
> >                  data.freeThreadLock();
> >              }
> >          }
> >      }
> >  }
> >  
> >  public class Data {
> >      private HashMap data = new HashMap();
> >      private ThreadLock lock = new ThreadLock();
> >      private boolean dataModFlag = false;
> >      public void lock(){
> >          lock.getThreadLock();
> >      }
> >  
> >      public void free(){
> >          lock.freeThreadLock();
> >      }
> >  
> >      public boolean getDatModFlag(){
> >          return this.dataModFlag;
> >      }
> >  
> >      public void setDataModFlag( boolean flag ){
> >          this.dataModFlag = flag;
> > 
> > 
> >      }
> >  }
> >  
> >  On Fri, 2004-11-05 at 00:29, Arif Amirani wrote: 
> > Hey Stephen, I have like 1k clients connected to a DB over OpenAMF and
> > Tomcat on either ends (obviously with a Flash client :-)). Now each client
> > can make changes to the DB and this needs to be reflected automatically for
> > all the clients. Now there are 2 use cases to this: 1. Only 1 client is
> > connected to the DB and hence the client unneccessary polls for changes. 2.
> > 1k of them connect simultaneously and data changes changes rapidly so the
> > polling is justified. In an event based system, on each data change every
> > client would get notified by the server. So no changes no events no requests
> > made. But in poll based system my 1k clients make 1k requests every 2
> > seconds (thats the frequency i intend to set). Thats too much! So in essence
> > as i posted earlier we need an intelligent polling system and the interval
> > should be variable. Earlier post sorry to repost. "Seems like polling may be
> > the way to go but if I have like 1k clients polling unneccessarily to a
> > potentially static data server which may have a sudden data change once in a
> > while, it does not sound seriously lucrative. I was thinking of
> > designing/implementing an intelligent polling system which attaches a
> > probability to the next poll. Depending on this probability the client will
> > automatically deduce when to poll next, but I guess such a solution is not
> > very generic and scalable. I just want to finally have a system that is as
> > efficent as event based models and can be implemented using polling." Would
> > such a model actually work or im just thinkin too much math :) Thanks, Arif
> > Amirani. "Stephen Jackson" <[email protected]> wrote in
> > message news:1099616593.2655.0.camel@vaquero... What are you trying to
> > solve? On Mon, 2004-11-01 at 04:19, Arif Amirani wrote: "is there no way to
> > send a message from server to client?" Can somebody please comment on this?
> > I am facing imminent polling code to be written if this goes unanswered :)
> > Thanks, Arif Amirani "Ian Pojman" <[email protected]> wrote in message
> > news:[email protected]... EJBs are good for
> > client/server stuff, for one.... its not the programming APIs which you need
> > it for as much as leveraging the functionality of an EJB container, that is,
> > writing simple EJB POJOs and having the magic 'be worked' underneath you. no
> > rmi programming, pooling, etc. I guess using OpenAMF is asking for better
> > performance than SOAP... that's one of the reasons why I'll most likely
> > stick with OpenAMF... is there no way to send a message from server to
> > client? On Sun, 31 Oct 2004 19:49:02 +0100, Franois Le Lay <[email protected]>
> > wrote: > Yeah actually, the idea is to come up with a richer set of examples
> > than > the ones provided in openAMF. As you mentioned it, I also tend to
> > think > that one can achieve better performance by avoiding the use of >
> > persistance frameworks or EJBs whenever they don't fit the purpose. >
> > Actually has anyone here used EJBs rather than JavaBeans/POJOs and for >
> > what specific task? > > > > Ian Pojman wrote: > > >I use hibernate and
> > various j2ee stuff but I do not advocate the use > >of JBoss or JDO or
> > commons stuff. one can do a lot better without a > >bunch of bloaty
> > frameworks... > > > >really nothing much of j2ee is germane because you can
> > do whatever you > >want in your services. > > > >I would rather see someone
> > show some patterns in using openamf, > >examples of more complex AMF
> > conversations. > > > >/ian > > > >On Sun, 31 Oct 2004 18:15:33 +0100,
> > Franois Le Lay <[email protected]> wrote: > > > > > >>Hi all, > >> > >>I would
> > like to write a "getting started" doc dealing with the joint use > >>of
> > OpenAMF+AS2+JBoss+Eclipse+(JDBC, Commons.DbUtils, JDO, Hibernate). So >
> > >>right now I need to know if some of you are using this combiantion of >
> > >>tools as their base framework? Could you describe the way you work in a >
> > >>few simple steps? I know it sounds like I should be more specific about >
> > >>it, but we can get into details later. > >> > >>Cheers, > >>Franois > >> >
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