Re: Re: Re: Development Framework

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 > >> >
> >> > >> > > ------------------------------------------------------- > This
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