Aggregated Core Services

Aggregated Core Services
Aggregated Core Services is extensions to Core Services. ACS is usually either context-specializing (CustomerCustomer and VendorCustomer) or aggregations from several Core Services like in CustomerDashboard which aggregates from Customer Service, Order Service and possibly more services

Characteristics

Services combined and orchestrated to produce
aggregated services

Aggregated functionality from several services
Context mapping
- Translating between contexts
- Anti corruption layer
No central persistence
- Could (should) have cache (state full)

Code-Patterns for Aggregated Core Services

Context Map-oriented Aggregated Core Services

EDR-aggregated Aggregated Core Services

Technology/Implementation strategy (Java)

Technology

Code-centric ESB products
Space-Oriented Architecture
EDA products
AOP-oriented containers (services inlined as aspects)

Implementation and products

Java code
Use mobile code if you can
- Jini/JavaSpaces or XML/XSD
ESB/EDA products
- Mule, OpenESB (Glassfish), ServiceMix
- OSGi containers
- Esper (EDA-container)
Wrappers
- Glue, XFire, SpringWS, (Axis)

Technology/Implementation strategy (.NET)

Technology

.NET 1.0/2.0 ASMX
Windows Communication Foundation (WCF)
IIS Hosted
Windows service / Self-hosted
In-proc (rarely)

Implementation and products

.NETcode
BizTalk orchestrations can do a good job for mapping and high throughput

Design rules (often called design-time governance)

P1. A service shall have one named owner	P2. A service shall provide documented business value	P20. All services shall be in the service universe	P21. A service shall be categorized (OW SOA category)	P22. A service shall have an "authentication, authorisation, endpoint strategy"
P23. A service shall document its Service Level Agreement SLA (response time, availabillity++)	P3. A service shall do one only thing, and one thing well	P30. A service shall have a versioning strategy (ACS, CS)	P30. A service shall have a versioning strategy (ACS, CS)	P31. A service shall provide for audit and monitoring of service usage
P31. A service shall provide for audit and monitoring of service usage	P32. A service shall document its Service Level Agreement SLA (response time=30ms, availability=99.995%)	P32. A service shall document its Service Level Agreement SLA (response time=30ms, availabillity=99.995%)	P40. A service shall provide at least one Evolving Service Endpoint	P41. A service shall provide heartbeat and traffic monitoring
P90. A service shall have a documented coupling to the contractual and requirement for service usage

Designtime governance for ACS-services

Aggregated Core Services