1. VistA Service Backplane Demo
Reference Implementation Demo
Hadrian Zbarcea
Edward Ost
11/18/2018

2. Review Open Healthcare Platform OSEHRA Reference Architecture
SOA Reference Implementation
Use Case Elaboration
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3. Reference Architecture Principles
Standards Based
HL7 & FHIR Compliance
SOAP
REST
JMS
Separation of Concerns
Support for REST and message centric architectures
Event Driven
Policy-centric Management
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4. Integration Use Cases Non-invasive mediation RPC Composition
Transport Mediation
Reliable Delivery
Federated Query
Federated Identity
Federated Security
Transport Security
Message Security
RPC Composition
Composite Services with Camel
Event Enablement
Subscription Management
Monitor and Manage
High Availability
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5. Scenario Template Use case description Sequence diagram
Design Analysis
Working code in OSEHRA Git
Test Driven, integration test routes as requirements in OSEHRA Git
YouTube design review
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6. Architecture – Layered Integration
Process
Human-in-the-loop, long running, asynchronous
Orchestrates Business Activities
Mediation
Choreograph Managed Services into Business Activities
Transform Events into Command Messages
Correlate Events with Business Process
Managed Services
Adapt Basic Services to provide consistent integration semantics for security, reliable messaging, and other cross-cutting concerns
Enrich data messages into Events with Process Id for correlation
Correlate requests-replies from Basic Services
Basic Services
Stateless business logic and data services
We have Business Processes that orchestrate Business Activities.
Business Activities are composed of potentially multiple Managed Services via Mediation.
Managed Services and Mediation work together using a standard integration framework that assures consistency, repeatability, and manageability.
That framework also supports wrapping Basic Services exposed by traditional application development teams which no longer need to build complex IT related services.
It also addresses how we compose services in an asynchronous manner for scalability and performance.
This framework is the kernel of the Service Backplane and in an Apache architecture this functionality is delivered by Apache Camel.
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7. OSEHRA Reference Implementation
Generated by VistA Service Assembler (VSA) Wizard
VistA
VSB - Apache Camel, CXF, Karaf, ActiveMQ
SOA Service Descriptors (CXF, Camel)
Camel & CXF XML + metadata
VistA SOA Services
M Platform
(Caché or open source platform (ie. GT.M), 130+ instances in production in VA)
VMRCS – NodeJS (EWD), Backbone.js
VistA M Routine Calling Adapter (VMRCA)
All Other Packages
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8. Demo
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9. Demo Summary Simple Proxy Command Line Query Replay proxy
Identity Proxy
Federated Identity
Federated Query
Route Configuration in GUI
Vertical DSL / Command Libraries
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10. Contribute to OSEHRA VistA SOA RI
Github
Wiki
Issues
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11. OSEHRA SOA Reference Implementation
OSEHRA / Apache OSS
Community Activities
Use Case Identification and Elaboration
Create projects for subsystems in OSEHRA GIT
VistA Service Backplane Reference Implementation based on Apache
Governance Policy Proposal
Develop OSEHRA Reference Architecture
Develop OSEHRA Reference Implementation
Align RA and RI with VA EA
Builds upon whitepaper being developed by Steve
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12. Future Topics SOA RI Working Group OSEHRA Topic Survey
REST / SOAP Services
oAuth / WS-Security
Build Infrastructure
Standard build and CI environment
Standard server configuration
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