Re: [Hardhats-members] web based access to VistA (was EsiObjects...)

Thu, 09 Sep 2004 11:02:04 -0700

Terry:
Could you point to any web based source of information about this project and its details. If no such sources currently exist can you note Point-of-conatact information (including e-mail addresses and names) for those who would like to followup. I am sure that others also would find such information valuable.

On Thu, 9 Sep 2004, Terry Wiechmann wrote:

PS: The Naval Hospital in San Diego uses EasyCHCS (predecessor to
EasyEnterprise) to present CHCS data to providers via their browsers. It's
been in production for a couple years now. Additionally, a small company in
CA uses EsiObjects and GT.M to generate applications (non-medical). They
converted the Java Gateway to a PHP gateway. Their applications are all web
based.



Terry L. Wiechmann
www.esitechnology.com
978-779-0257
----- Original Message -----
From: "Terry Wiechmann" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, September 09, 2004 7:22 AM
Subject: Re: [Hardhats-members] web based access to VistA (was
EsiObjects...)


Sorry, a simple question to a teacher will produce this kind of response
;-) 
My apologies...



The web application is a three-tier architecture. Direct web capability is
not a part of EsiObjects.



EsiObjects is a layer that sits on top of the MUMPS and implements an
object 
model (with MUMPS code and globals just like File Manager implements its
model). Additionally, EsiObjects provides support for TCP based
communications. The object model is accessed through sessions (processes)
that are TCP based. From the EsiObjects client (development or runtime),
you 
connect to the EsiObjects environment (a process on some MUMPS machine).
EsiObjects has several ways of connecting: 1) COM Bridge for MS
Applications 
2) Wireless, 3) Java Gateway and 4) CORBA (EsiORB) for enterprise wide
applications. These connectivity packages are written as a combination of
MUMPS and external code.



The EsiEnterprise web-based application is a three-tier application. It
was
originally implemented to integrate and display data (within a web
browser) 
collected from CHCS and VistA systems. On the server side, the EsiObjects
environment (server or model side) contains VistA data wrappers (classes
generated from the VistA DD). These wrappers access VistA globals directly
(read-only because the application only pulls and displays data). A
session 
level object fa�ade provides the application interface to the caller
(through the TCP layer) and accesses the wrappers to retrieve data. The
application itself resides on the application server and is written in
JSP/Java. This application uses the Java Gateway. That is, with the
EsiObjects development environment, a Java proxy is generated of the
session 
application fa�ade and integrated into the application layer. The
application code on the application server uses this proxy interface to
communicate (transparently) with the EsiObjects environment on the server.



I had a demo up and running for some time but am in the process of
rebuilding all of my servers. When it is back up I will let you know.



The bottom line is this - it is not 'the' web approach - it is only one of
many approaches. Its just another choice for those that want to go the OO,
three-tier route - no competition intended :-)



Terry L. Wiechmann
www.esitechnology.com
978-779-0257



----- Original Message -----
From: "Jim Self" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Thursday, September 09, 2004 1:37 AM
Subject: Re: [Hardhats-members] web based access to VistA (was
EsiObjects...)


Web based access to patient records and other VistA data is easily
accomplished with
M2Web. It is not an aspect of EsiObjects that I am aware of. How would
that be done? Is 
some kind of demo of it already available?

Bhaskar, what specifically do you want to demonstrate? Perhaps it could
be
achieved with a 
small programming project.

Bhaskar wrote: 
ESIObjects is not yet a part of the OpenVistA VivA demo CD, but I would
like it to become a part of it, especially to demonstrate web based
access to patient records.

-- Bhaskar

On Mon, 2004-09-06 at 12:32, Kevin Toppenberg wrote: 
Terry,

I wonder if it would be possible for you to write a
SIMPLE demo of the ESI technology to include with the
next VistA demo disk?  I understand that Bhaskar is
now including the ESI technology as part of the
standard OpenVistA stack.  It might be nice to be able
to demonstrate what it can do.

I think you told me what the technology is all about
before, but without a picture or an app to associate
it with, I keep forgetting.

Just a thought.  Thanks for your work on this.

Kevin


--- Terry Wiechmann <[EMAIL PROTECTED]>
wrote:

Shortly ESI will be submitting the new EsiObjects
V4.1.1.2 kit to Open Source. Because of the
obsolescence of MSM and DSM, I've decided to
discontinue support for these two M systems. We will
be putting our efforts into enhancing EsiObjects for
GT.M and Cache, implementing the new Java client,
adding new packages and adding support for other
MUMPS implementations such as M21 and MUMPS V1.



If anyone has a really strong objection to this
decision, please send me a mail message at
[EMAIL PROTECTED] or call me at
978-779-5351.



Terry L. Wiechmann
www.esitechnology.com
978-779-0257


---------------------------------------
Jim Self
Systems Architect, Lead Developer
VMTH Computer Services, UC Davis
(http://www.vmth.ucdavis.edu/us/jaself)


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