Extending the Platform -...

Extending the Platform

21st VCM, George Mason University, Fairfax, Va.Andy Pardue & Ben Mehling

OVID

The OVID (OpenVista Interface Domain) layer is a set of development tools designed to enable software developers easier access to OpenVista data and applications.

OVID is a foundational technology that allows developers to build upon OpenVista (and VistA

Copyright © 2010 Medsphere Systems Corporation2

developers to build upon OpenVista (and VistA derivatives) using alternative languages (such as Java) or architectures (such as Web Services/SOA).

Vital stats:

� Originally released: April 2009

� License: AGPL

� Technologies: M, Java

� Downloads: Open Repository & 2000+

� Home: http://medsphere.org/community/project/ovid

� Recent whitepaper: http://www.medsphere.com/ovid-white-paper

OVID Technical Capabilities

• Useful for building on the OpenVista/VistA platform:

� Traditional applications

� Web/Mobile applications

� Exposing OpenVista data/logic as Web Services

� Console based applications

� Automation and Integration

• Ability to create M to Java calls, allowing M applications to call


• Ability to create M to Java calls, allowing M applications to call external Java APIs

• Ability to create Java to M calls, allowing Java applications to call into M APIs

• Supports creating Java domain objects

OVID Architectural Overview

Domain Object Repository

Java Apps(Thick and Console)

Web Services Repo

• How does OVID work?

� Communicates over generic transports, such as RPC Broker or CIAi Broker

� Implements an interface for calling existing RPCs

� Implements an interface to FileMan’s “silent” database API

Web/MobileApps

Copyright © 2010 Medsphere Systems Corporation4OpenVista

OVID M/RPCs

RPC/CIAi Broker

M/RPCs FileMan

OVID Connection

OVID Message

Domain Object Repository

(Patient, Order, Medication, etc.)

FileMan’s “silent” database API

A Platform

Using the OVID technology and framework, community contributors and Medsphere have created new tools and applications:

� Web Services to CCR/CCD gateway

Copyright © 2010 Medsphere Systems Corporation

� Web Services to CCR/CCD gateway

� Web Services to DoD KMR middle tier

� IHS/Medsphere Clinical Flowsheet, Pharmacy and more in development

� iPhone/iPod application to view patient record in real-time

� Registration application built on OVID

� RESTful interface to OpenVista

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Sample web front-end

VistA provides a strong integrated solution

...but, Integration is a double-edged sword

VistA has not easily adapted to the changing world

When to consider OVID

s in computing, platforms and devices


OVID can be used in projects with varying goals:

• Integration – the glue between disparate systems

• Extension – or a platform on which to build

• Migration – a transitional path

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platforms and devices

Integration

OpenVista

Image Interface

HL7

XML


WebDAVImage Repo

Mirth Engine

Interface

OVID

XML

Files

Extension

OV

ID

Domain

Patient Dashboard Application


OpenVista

OV

ID

DomainLayer

Extension

OV

ID

Domain

Patient Dashboard Application


OpenVista

OV

ID

DomainLayer

RESTfulWebService

Migration

OVID-based WebServices

ClinicalFlowsheets

ClinicalFlowsheets


OpenVista


MySQL

Migration


ClinicalFlowsheets

ClinicalFlowsheets

PharmacyPharmacy


OpenVista


MySQL FDBDIF

Migration


ClinicalFlowsheets

ClinicalFlowsheets

PharmacyPharmacy


OpenVista


MySQL FDBDIF

AWSBigtable

Domain Layer

• A layer of business objects focused on defining the properties and behavior of the concepts they represent.

� Object oriented, reusable across applications.

� Isolate, as much as possible, underlying complexity and details from the users of the objects.

� For our purposes, a domain layer should be a simple, repository based approach to accumulating useful domain


repository based approach to accumulating useful domain objects.

� Extensible to other architectures and platforms (SOAP, REST, Web, etc.)

� Lowers the ramp up time for new developers to become productive.

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• RPCBroker, CIABroker, VistalinkBroker interfaces

• Connection pooling

• Temporal caching

• FileMan/Mumps RPC Access

• Support for annotated Java beans

OVID API


OVID Domains

• Patient (Demographics)

• Patient Contacts (NOK,

Guarantor)

• Location/Ward/Institution

Information

• Vital Signs

• Drug information

• Medication Administration Log

• Orders/Orderable Items


Information

• Kernel Info (e.g. Platform

detection)

• Users/Clinicians (New Person)

• Laboratory Test Results

• Problems

• Order status/dialog

• Patient Movement

• Prescriptions/refills

• Immunizations/refusals

• TIU Document Retrieval

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DDSS & KMR Project

• Middle-tier DDSS Research Project

� Data Services (C83) from RPMS and OpenVista

� “Service Orienting” the Rules Engine

� Web app container for


� Web app container for VueCentric

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For details, see: http://socraticgrid.org/index.php/documentation.html

KMR Services -- What’s available

• CAL layer defines what web services are implemented

• Utilizes HL7 V3 XML objects for data requests and responses

• All service providers (RPMS, OpenVista) implement this interface.

� (These implementations are called “mappers” because they map from native data elements to the HL7 v3 objects required by the CAL layer.)

• CAL layer is implemented as a SOAP Java web services (jax-ws)

• Runs within the Glassfish application server


• Runs within the Glassfish application server

• Coding systems are used when available in source data: LOINC, ICD, CPT, NDC, HL7

• Currently implements the following CAL domains:

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� FindPatients

� GetPatientInfo

� FindProviders

� GetProblems

� GetLabResults

� GetMedications

� GetAllergies

� GetImmunizations

� GetVitalSigns

Demonstration

• CCD Document Creation

� Used anonymized data from a large sample RPMS dataset

� Aggregation of ~5 domains into a CCD XML file

� Built on OVID, automated the CCD creation from RPMS in a few hours of developer time

• Populating popHealth1 Repository


� One CCD XML file 2 was created for each patient

� The import process reads a directory of CCD records in batch, loading each patient into the repository

• Population Health Reporting

� Influenza Vaccination

� Hypertensive BP Under Control

� Ad hoc reporting...

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1 http://www.projectpophealth.org/2 Incomplete CCD record due to popHealth limitation -- clinical coding incomplete/hardcoded

FM Projection

FM (File Manager) Projection is a technology that “projects” the data structure of OpenVista into a relational database format.

Users can query against FM data structures using SQL queries and tools.


Vital stats:

� Planned release: January 2010 VCM!

� License: AGPL, LGPL

� Technologies: M, Java, C

� Downloads: Open Repository

� Home: http://medsphere.org/community/project/fm-projection

FM Projection

Architecture:

• M-engine agnostic (GT.M or Cache)

• Implements a MySQL storage engine that is backed via a network connection to an OpenVista server

• Projection model uses SQLi package

Capabilities:


Capabilities:

• Data can then be accessed via J/ODBC data tools and compatible data access development libraries

• A Java-based schema and data viewer is included

• Current version provides read-only access

Uses:

• Connect open source or COTS data analysis, reporting, BI tools

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SQL Parser/Optimizer

MySQL Clients

FileMan Projection Architecture


MyISAMStorage Engine

InnoDBStorage Engine

FileManStorage Engine

RPC Broker

FileMan SQLi

SQL RPCs

FileManVisualizer

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To do

• Indexes on "New Style" FileMan indexes

• Provide better optimizer hints

• Foreign keys

• Prefetch results instead of RPC call per row

• Custom network socket connection for


• Custom network socket connection for performance

• Eventually, write abilities

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Demonstration


Demonstration

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FM Visualizer (FMVis)

• Inspect Files

� Fields

� Data

� Globals

� Relationships

� Graph


� Graph

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Standard SQL via DBVisualizer

• Schema inspection

• Queries:

� Titles

� Users with their titles

� Average Age & Standard Deviation of Patients

� Most recent signed notes


� Most recent signed notes

• Project Files to MySQL from FMVis

� STATE

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Jasper - iReport

• Sample Reports

� Users by Title

� Signed notes (previous two weeks)

� Patients w/ Allergies

• Projection, not Replication

� Run Report


� Run Report

� Data alteration

� Re-run Report

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• Semantic Web EMR, Wed 6/9 @ 3:15pm

• Medsphere Overview, Fri 6/11 @ 9:00am

Questions


Questionshttp://medsphere.org/

http://medsphere.org/

Extending the Platform -...

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