leader replacement system - Department of Public Social Services ...

Los Angeles County
Department of Public Social Services
LEADER Replacement System (LRS)
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allows for the development of a systems architecture that is also modular and
flexible for unanticipated changes in business requirements and technology.
The SOA implementation shall be based on the following principles as
defined under California Enterprise Architecture Program Service-Oriented
Architecture (SOA) Master Guide:
1. Design for Ease of Use
2. Design Web services with appropriate granularity
3. Reassemble before Rewrite
4. Web services should be loosely coupled and extensible
5. Web services must have well-defined interfaces
6. Design stateless base Web services
7. Implement business processes via orchestrating Web services into a
process flow (BPEL standard)
8. A governance structure must be created to manage Web service
development and operational environments
9. Implement Web service security and policy enforcement standards
• Support Event-Based Processing. All new system design and
development should be driven by business events. Event-based processing
enables applications to adapt quickly to changes in business processes by
only changing the application component related to the changed business
event and strengthens linkage to the business by mirroring the actual
business environment.
• Support Workflow Processing. All new system design and development
should incorporate workflow functionality. Workflow processing enables
applications to incorporate functionality such as approvals within an
application and change processing paths through the application without
source code programming changes.
• Support Data Warehousing. All new system acquisition and development
should support the capability to develop online transaction processing (OLTP)
and/or data warehousing applications. These two classes of applications
require very different data models and make very different demands on
database systems. Online transaction processing focuses on quick updates of
the data. Often, the speed of these updates can be dramatically slowed down
by the processing generated by user queries. For this reason, it is best to
separate the data warehouse from the OLTP. In so doing, we also provide for
a more secure environment for both OLTP and data warehousing.
• Partitioning and Modularization of Application Components. System
solutions should be highly partitioned, modular in design, that are comprised
of components that are maximally decoupled, and that use standards-based
messaging protocols for communication between external and internal
systems. This kind of modular implementation should allow for the upgrade,
LRS RFP - Attachment H (Technical Exhibits) Page 11 November 30, 2007