[WSO2Con EU 2017] Creating Composite Services Using Ballerina

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To implement most business use cases, it is required to reuse existing services. Writing everything from scratch isn’t practical or efficient. A composite service is a coarse-grained service which reuses the functionality exposed by other services. This session will explore how implementing composite services using Ballerina is straightforward as it has all the features required to implement various types of composite services.

Senior Technical Lead, WSO2
Creating Composite Services Using
Ballerina
Isuru Udana

• Atomic
– Indivisible, fine-grained, no reuse of other services
• Composite
– Divisible, coarse-grained, reusing other services
Services

• Most real-world business use cases cannot be
satisfied with atomic services
• Reuse of existing services
Why Composite Services?

Healthcare Service Chaining
Real-World Scenarios

Microservices Layered Architecture
Consumer 1
API Service 1 API Service 2 API Service 3 API Service 4
Consumers
Consumer 2 Consumer 3
Service 6 Service 7 Service 8 Service 9
Service 1 Service 2 Service 3 Service 4 Service 5 Proprietary &
Legacy
Systems
Web API /
SaaS
API Services/
Edge Services
Composite Service/
Integration Services
Core Services/
Atomic Services

Microservices Layered Architecture
Core/Atomic Microservices
• Fine-grained self-contained services

Microservices Layered Architecture
Composite Microservices
• ESB in SOA => Composite Microservices in MSA

Building Composite Microservices
Frameworks Based on General Purpose Languages
• Not designed with suitable abstractions for network
interactions
• Developers spend more time on building service
interactions

Building Composite Microservices
Conventional ESBs
• ESB architecture not fully compatible with MSA
principles

Ballerina
• Parallel programming language for networked
applications
• Designed for network interactions with JSON/XML/SQL
and HTTP/JMS/File/WebSockets
• Serverless and container friendly

Building Composite Services with
Ballerina
Key Functionality
• Transformation
• Routing
• Parallel processing

Transformation
Transformation
Logic
Structs

Transformation Source
Target
Mapping
Operators

Routing
Content Based
Get Payload
Routing
Logic

Routing
Header Based
Routing
Logic
Get
Header

Building Composite Services with
Ballerina
Services
• Simple Atomic Service
• Composite Services
– Simple composite service
– Service chaining
– Service orchestration

Simple Atomic Service Service
Annotations
Protocol
Resource
Resource
Annotations

Simple Atomic Service
Protocol
Resource
Resource
Annotations

Simple Composite Service
Logic
Downstream
Services

Simple Composite Service
Downstream
Services
Logic

Service Chaining
Invoke
Service1
Invoke
Service2

Service Chaining
Invoke
Service1
Invoke
Service2
Construct
Payload
Construct
Payload

Service Chaining
Construct
Payload
Invoke
Service 1

Service Chaining
Construct
Payload
Invoke
Service 2

Service Orchestration Scenario
Online Vehicle Revenue License Service
Can be invoked
at the
same time

Service Structure
Service Path
Certificate
Validation
Resource
License
Resource
Resource Path

License Resource
Validate
Certs
Do
Payment
Call License
Issuer
Respond

Certificate Validation Function
Workers
Fork
Join

Certificate Validation Function
Workers
Multiple
Return
Values

Certificate Validation Function
Validation
Logic Multiple
Return
Values

Function Invocation
Function
Invocation
Function
Invocation

Function Invocation
Multiple
Return
Values
Function
Invocation

Conclusion
● Introduction to composite services
● Composite services in Microservices architecture
● Building Composite Services with Ballerina

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