[ale] PHP vs. J2EE

[Michael D. Hirsch]

On Thursday 20 March 2003 12:37 pm, C I wrote:
> I haven't played with it in a while but PHP has the
> ability to access Java classes directly.  So you could
> have all you logic in Java on the backend and just
> have the PHP request the needed info and the Java will
> return the data.  Was a lot of fun to play with.

Every time I've tried to use it there were big stability problems.  The 
last time (couple of weeks ago) we tracked it down to a JVM flaw buried 
pretty deep in code and well beyond my understanding.  We had tomcat 
calling php calling back in to java.  When it crashed it brought the whole 
server down.  Be careful.

Michael

> CI
>
> --- Chris Fowler <cfowler at outpostsentinel.com> wrote:
> > -----Original Message-----
> > From: ale-admin at ale.org [mailto:ale-admin at ale.org]On
> > Behalf Of Jason Day
> > Sent: Wednesday, March 19, 2003 3:54 PM
> > To: ale at ale.org
> > Subject: Re: [ale] PHP vs. J2EE
> >
> >
> > On Wed, Mar 19, 2003 at 03:32:26PM -0500, Chris
> >
> > Fowler wrote:
> > > I'm looking at solving a simple problem with a
> >
> > simple solution.  Problem
> >
> > > is that I'm not sure of what language to use.  The
> >
> > only benefti of J2EE
> >
> > > is that I can have back end agents in Java
> >
> > collecting data.  Then the
> >
> > > web app can communicate with the agents to get
> >
> > that data.  I see PHP as
> >
> > > a way to insert dynamic code into a static web
> >
> > page that executes when
> >
> > > the server loads the web page.  Is this the
> >
> > correct view of each.
> >
> > What do you mean by "back end agents in Java
> > collecting data"?  Do you
> > mean you have existing Java code that runs in a J2EE
> > container, or do
> > you have an app server that has some kind of support
> > for agents written
> > in Java, or something else?  I guess what I'm asking
> > is, why must the
> > agents be written in Java?
> >
> >
> > Because the data is being sent from the device.
> > Sure, the page refresh can
> > go out and query
> > 100 devices but why would you want that?  That would
> > be too slow.  It would
> > be easier to
> > get device status from a middle man on 127.0.0.1.
> >
> > > I really want an agent collecting data and the web
> >
> > interface collecting
> >
> > > info from the agent.  the agent will communicate
> >
> > with 100 devices.  I do
> >
> > > not want the PHP to have to communicate with 100
> >
> > devices when a user
> >
> > > hits the refresh button.  What are my options?
> >
> > Can the agents dump their data into a database?
> > Then you can write PHP
> > that just hits the db.
> >
> > That is a good idea.  I could write an agent in
> > language X that would
> > collect data
> > and just dump it to a MySQL database.  Then the PHP
> > can interpert the data
> > in the database.
> > I have PHP scripts that now display the result of
> > nightly software build.
> > The software build is controlled by a Makefile and
> > the main nightly build
> > script is in bourne.  Cron
> > then executes this script at 1:59am each day.  The
> > results including
> > software is displayed
> > nicely by a PHP script.  Only reason PHP is invloved
> > was to give an easy
> > remote way
> > of viewing the results of the build.
> >
> >
> > I guess a web app is more suited for historical data
> > and not instant data.
> > My device send notifications back to any client that
> > registers itself with
> > the device via UDP.  A web page can not receive a
> > UDP message.  A Java
> > applet can but I have a full java app that does it
> > all so the java applet
> > would be useless.
> >
> > Sure you can query but if a page sits there all day,
> > the data does not
> > change for that user until they or the page
> > refreshes. If you set that up
> > for 30 seconds, that could create useless TCP
> > traffic that is not needed.
> > I'm just thinking of ways to web enable an app that
> > has been written in
> > Java.
> >
> > --
> > Jason Day
> > jasonday at
> > http://jasonday.home.att.net
> > worldnet dot att dot net
> >
> > "Of course I'm paranoid, everyone is trying to kill
> > me."
> >     -- Weyoun-6, Star Trek: Deep Space 9
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