Iteration 3 Architecture

This wiki page describes the architecture for Iteration 3 of the SCOOP project.

Context

The architecture context is basically the same as the previous iteration; however, we are looking at enriching the EMR exporter to contribute back to the community.

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This iteration is being deployed to a laboratory environment (non production) at UVic.

There is only one practice being simulated in this iteration (i.e. one endpoint).

Logical View

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There are a number of architectural changes planned for this iteration of SCOOP.

1. We are continuing to enhance and refactor OSCAR to export the patient summary document, either for a single individual or by batch for all individuals with a record in the EMR

2. The middleware (Mirth) will play a much smaller role in this design. It will simply transfer individual summary documents between the EMR and the hQuery Gateway. It will not perform any aggregation or transformation.

3. hQuery Hub will be investigated as to how we can extend the reporting functionality of the resultant queries. This will allow for future iterations to have a more meaningful result for the researcher by providing a better view of the information.

Constraints

Privacy Individual information never leaves the practice. Early feedback from discussions with the faculty physicians UBC highlighted their stewardship of patient information as a serious matter. There’s a genuine concern that anonymous data collected may be used for unintended research purposes in the future. Several are concerned by the risks of data aggregation, even when the data is de-identified.

Open Source As SCOOP development is sponsored with public funds it will be released as open source for any one to use. In addition, SCOOP will only rely on free, open source components so that its use is accessible to any individual/group.

OSCAR In addition to being open source, OSCAR is the EMR used by many UBC clinical faculty and physicians. A few of these faculty members will the initial SCOOP users. For this reason, OSCAR will be the first supported EMR.

Design View

Software design of the new export feature in OSCAR

We will attempt to stay true to the MVC design. Velocity based templating requires both a template and a data model. We have opted to make the Patient object draw on all the pre-existing DAOs and models and have Patient group up the relevant fields for easy velocity access. Most of the heavy code work will be found in E2EVelocityExport.java and DemographicExportAction4.java acts as the Event Handler and file management for the export function.

Software design for new hQuery enhancements

As we are not changing our question, the hQuery tool remains the same as the previous iteration.

Query Design

Since hQuery follows the map-reduce paradigm for gathering and returning results, we will also be using a mapping and reducing design.

Map

As we are not changing our question, our map function remains the same as the previous iteration.

Reduce

As we are not changing our question, our reduce function remains the same as the previous iteration.

Data View

Introduction to E2E E2E, or EMR to EMR, is a CDA specification being developed by BC's PITO organization. Its main purpose is to create a standard in which EMR data can be transmitted to other Canadian EMRs in a standardized way.

Overview of E2E sections (including image)

Scope of content for Iteration 3 In order to sufficiently return value back to the OSCAR community, we need to implement a minimally functional full E2E exporter. As such, our scope includes all sections and content that is defined as required by the E2E specification.

Technology Selection

OSCAR An Open Source EMR system used by many private physicians. This is way that individual information is captured - and the user interface for the physician practioner end user.

Mirth Mirth is an open source interfacing system. It acts as generic middleware between many healthcare software systems and connects them via HL7 messages (although several formats / protocols are supported).

Mirth Rest Adaptor This is an open source piece of middleware developeed by the SCOOP project. Mirth does not fully support restful web services. Specifically it does not allow naming of attachments to web service calls. For this reason, hQuery gateway cannot find the patient summary document when Mirth calls it directly. This component can be thought of as a restful web service relay that renames a single attachment (patient summary document) before forwarding the call.

hQuery Gateway The query gateway is a web based application that provides the back end for executing queries. The query gateway which exposes a query API, accepts queries, runs those queries against the patient data, and returns the results of the query back to the query composer.

hQuery Composer The query composer is a web based application that provides the front end for creating, managing, and executing queries. Those queries are executed against the query gateway which exposes a query API, accepts queries, runs those queries against the patient data, and returns the results of the query back to the query composer.

Scoop Endpoint refers to all the non-emr SCOOP software components that will reside at a practice in the future. This indludes hquery gateway, Mirth, and Mirth Rest adapter.

SCOOP Hub This is the application that the researcher uses to ask a "question" of the Research Network. This includes features for query management, policy enforcement, privacy management, and security. Currently, hQuery composer is the only software system in the hub - but more design and enhancements are needed.

• Libraries: template