Increasingly, developers and architects are disaggregating their architectures to create more scalable and agile applications. As this happens, everything is becoming a programmable endpoint. Ballerina is a new programming language designed around this problem. This deck introduces the challenges and background of why Ballerina has been created, as well as demonstrate the core features of the language.

1. Cloud Native Programming Language that Makes it Easy
to Write Microservices that Integrate APIs
Anupama Pathirage
April 2019

2. Increasing demand is causing disaggregation

3. Everything is
An Endpoint
Functions
APIs
Data
SaaS apps
Legacy apps
Devices
Disaggregation leads to more endpoints

4. Integration in an increasingly disaggregated world
Transactions
Circuit Breaking
Protocols
Payloads
Events
Security
Workflow
Streams
Compensation

5. ESB, BPMN, EAI
Java / Spring
JavaScript / Node

6. The
Integration
Gap
ESB, BPMN, EAI
Java / Spring
JavaScript / Node

7. AGILE
INTEGRATION SIMPLE

8. Microservice with RESTful API

10. Network Abstractions

11. ● Endpoints:
- Listener endpoints - For incoming network interactions
- Protocols
- HTTP/S
- HTTP2
- GRPC
- WebSocket
- JMS ..
- Client endpoints - For outgoing network interactions
- HTTP. WebSub, GRPC
- Database, FTP
- Twitter, Salesforce
Endpoints

12. ● Service is a collection of resources where each resource is network
invokable via ingress endpoints
● Services must be attached to an endpoint to be invoked
Services and Resources

13. Endpoints and Services ...

14. Network-aware Type System

15. Basic types and other types
○ Simple types
○ (), boolean, int, float, decimal, string
○ Structured types
○ tuple, array, map, record, table, xml
○ Behavioral types
○ error, function, future, object, stream, typedesc

16. Basic types and other types
○ Other types
○ Unions
○ Optional
○ json
○ byte
○ anydata
○ any

17. Union types
○ Type defined by union of two or more other types
○ Remember, a type is name for a set of values
float | string v1 = "John";
float | string v2 = 457.68;
float | string
0.51
1.01
457.68
-11.0
“John”
“name”
“”
“bal”
// The return type of 'post' is a union of 'http:Response' and 'error'
http:Response | error response = orderEP -> post("/create", reqPayload)

18. XML
// Simple XML literal
xml x1 = xml`<name>Pol Katta</name>`;
// XML with namespaces
xmlns "http://wso2.com" as ns0;
xml x2 = xml `<name id="123" status="single">
<ns0:fname>Pol</ns0:fname>
<ns0:lname>Katta</ns0:lname>
</name>`;
// XML literal with interpolation
string lastName = "Katta";
xml x3 = xml`<lname>${lastName}</lname>`;
// Concat XML values
xml x4 = x1 + x2 + x3;

19. JSON
json is just a union - () | int | float | string | map<json> | json[]
// JSON object
json payload = { "orderdata" : { "id": 1, "name": "XYZ", "price": 2500 } };
//Access object values
json orderid = payload.orderdata.id;
//JSON arrays
json orders = {
"orderdata" : [
{ "id": 1, "name": "XYZ", "price": 2500 },
{ "id": 2, "name": "ABC", "price": 3000 }
]
};

20. Sequence Diagram

22. Microservice Deployment

23. ● Ballerina natively understand Cloud Native platforms like Docker,
Kubernetes and Istio.
● Ballerina removes gap between developers and Ops.
● Ballerina support agile development to deployment and improve
productivity.
Takeaways

24. How to get involved
Learn more
Open source
Get support
http://ballerina.io
http://github.com/ballerina-platform/
Ballerina Dev Google Group
Ballerina Slack Channel
Stack Overflow #ballerina tag

25. THANK YOU