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From: "Johnny Kewl" <john@kewlstuff.co.za>
To: <dev@harmony.apache.org>
Subject: Visualizing JreLite
Date: Wed, 5 Mar 2008 05:14:14 +0200
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This is how I see it happening... I always talk from the point of view =
of Windows users... they must be able to use it.

BOOTSTRAP
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

There is a small bootstrap program it is called JRELite... its a native =
app probaby 80k

When this is installed on a system it does a file association with =
"JreLite"

THE JAVA APPLICATION
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

To use this system a user will reaname their execuatable jar from =
MyApp.jar
to
MyApp.JreLite

The above is all a user needs to know about and its how a user see's it.

SCENARIO
=3D=3D=3D=3D=3D=3D=3D=3D=3D

A programmer put their JreLite application on a web page, or emails it =
to a freind or its on a flash stick...
... anything

The user clicks on it...
The system effectively runs JRELite MyApp.JreLite


INITIAL HIT
=3D=3D=3D=3D=3D=3D=3D=3D

The bootstrap see's there is no Java on tha machine... it gets the =
JVMLite Engine...
Approx 3 meg HIT...=20

=20
STARTUP
=3D=3D=3D=3D=3D=3D=3D=3D

The Bootstrap place JVMLite in its special folder location...
Start... JVMLite -jar MyApp.JreLite


RUNNING BOOTSTRAP
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

The application starts and it needs a swing... the JVM's resolver can =
determine this...
It loads it.

So the thing to really understand is that the application starts almost =
immediately but its "still"
loading from the remote server, AS THE USER IS USING IT....=20

It feels like Java started in 20 seconds and remember this is only the =
first (one time hit)...
After that programs start "instantly"

Also think about this.... if a user never goes to a part of the =
application that is not used... that never has to be loaded.

Bottom Line
=3D=3D=3D=3D=3D=3D=3D=3D=3D
If we can strip the JRE down to somewhere around 3 megs.... make the =
classes and fonts late binding... and put them on a deliver server.
JRELite exists...

The JVMLite work... is mainly in bridging the resolver with the ability =
to pull the require component down from the server.
Where ever that font engine is hiding... it too has to bridged with the =
ability to pull a font down.

The rest of the work... is in making the downloads fine grained... you =
let the JVM pull the classes it needs... NOT the whole Jar.
So those Jars live on the server as a file structure...=20

If the font needed is Gothic A, and that needs a Unicode DLL.... ONLY =
that moves over the wire...

Yes... oh boy... they all packed into humongeuos file now.... that has =
to be fine grained on the server.

This works so well... you going to be shocked at how efficient Java =
becomes ;)

Harmony is not far from this already.... the packaging just has to =
change.

For now... just that needs to be done... complex optimizations can come =
later.

... I think ;)

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