Agile (enterprise) architecture has been a paradox since time immemorial. Now, with the arrival of Ballerina, that is no longer the case. Ballerina is the next big thing in enterprise integration. In this session we introduce this new, cloud-native, programming language. We explain how this seamlessly fits into a microservice architecture with APIs, does not step on the toes of existing services, and why every architect should know this language.

1. Integration Turns Sexy
So, Let’s Dance
Healing the Integration Gap,
Hans Bot

2. Angular Rust
React Swift
Go Python!

3. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
So, What’s Holding You Back?
1. You try hard to become AGILE

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the Premier Certified Partner of WSO2
Hint: More and More Pieces to Put Together
Monoliths
Client-Server
Service-oriented
Microservices

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the Premier Certified Partner of WSO2
So, What is Holding You Back?

6. Micro is the new EnterpriseMicro is the new Enterprise
Design to Disrupt

7. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
So, What’s Holding You Back?
2. You try hard to build great architectures
Micro is the new Enterprise

8. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
So, What’s Holding You Back?
You try hard to build great architectures
Micro is the new Enterprise
How to stay in control while your software gets blown to bits?
Event driven
MicroservicesDeployment
pipelines
StreamingCircuit breaks
APIs
IoT
Serverless
Containerized
Cloud native

9. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
So, What is Holding You Back?

10. Tooling proliferation is killing productivity

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the Premier Certified Partner of WSO2
Paradoxes anyone?
Micro is the new Enterprise Tooling proliferation
is killing productivity

12. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
WSO2 to the rescue
WSO2 is a successful,
medium-size open source
integration vendor
WSO2 has a complete
portfolio of proven
integration products
The WSO2-platform is
architecturally sound
Many large-scale
enterprises rely on WSO2
technology and support

13. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
Don’t take it from me
What Forrester Says About WSO2
• “WSO2’s open source solution provides a
solid base for a variety of API strategies.”
• “[WSO2 is] the only fully open source
solution in our Forrester Wave analysis.”
• “WSO2 provides good breadth across all
evaluation criteria.”
• “[WSO2’s] strengths include formal life-
cycle management and non-REST APIs,
both of which facilitate mature and
disciplined enterprise API strategies.”
• “WSO2’s solution provides flexibility to
address a variety of approaches to APIs.”
• “The reference customers provided by
WSO2 are highly satisfied with its solution
and very satisfied with the vendor.”
• “[Customers] tend to be very to extremely
satisfied with the product’s detailed
features and functions.”
• “Customer comments include“[WSO2’s]
partnership attitude inspires confidence
and trust.”
•And “[WSO2’s] solution is easy to use.”
WSO2 recognized
as leader in
The Forrester
Wave™:
API Management
Solutions,
Q4 2018

14. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
WSO2 to the rescue
WSO2 is a successful,
medium-size open source
integration vendor
WSO2 has a complete
portfolio of proven
integration products
The WSO2-platform is
architecturally sound
Many large-scale
enterprises rely on WSO2
technology and support
WSO2 is now introducing
Ballerina to close the
‘integration gap’

15. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
What is it?
• A modern, general
purpose programming
language (Turing
complete)
• Integration centric
• Cloud native, extensible
• Platform agnostic, open
• Designed for resilience
Why a new language?
• To support agile teams
with a single, powerful
development tool,
whatever their target
platform or architecture
• To bring state of the art
integration technologies
to server-side
application developers
What makes it special?
• Remote function calls
are as simple to code
as local function calls
• Connectivity details
inside code
• Built-in support for
streaming functions
• Sequence diagrams

16. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
With
All Development Artefacts originate from a Single Source
Massively Distributed Systems get Resilience
Modern data types are first-class citizens
Every Agile Developer turns Integration Savvy
table
xml
json
record
extensible
annotation
framework

17. © 2017 – Yenlo,
the Premier Certified Partner of WSO2
Ready for some beautiful code?

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the Premier Certified Partner of WSO2
// Service endpoint
endpoint http:Listener carEP {
port:9093)
};
@http:ServiceConfig {basePath:"/car"}
service<http:Service> carRentalService bind carEP {
@http:ResourceConfig {
methods:["POST"],
path:"/rent",
consumes:["application/json"],
produces:["application/json"]
}
rentCar(endpoint client, http:Request request) {
http:Response response;
[…]
_ = client -> respond(response);
}
import ballerina/http;
// Client endpoint
endpoint http:Client carRentalEP {
url:"http://localhost:9093/car"
};
function main(string... args) {
json outReqPayload =
{"Name":"",
"ArrivalDate":"",
"DepartureDate":"",
"Preference":""};
[…]
http:Response inResCar = check carRentalEP ->
post("/rent", outReqPayload);
}
Service InvocationSample code

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the Premier Certified Partner of WSO2
Error handling and ResilienceSample code
endpoint http:Client rfcService {
targets: {
url: “https://localhost:9443/carbon"
url: “https://cloud.yenlo.com/demo/carbon"
},
timeoutMillis: 1500,
retryConfig: {
interval: 100, count: 3, backOffFactor: 3
},
failoverCodes: [501, 502, 503]
};
Retry after 0.1, 0.3 and 0.9s
var rfcResult = rfcService->function(params);
match rfcResult {
http:Response res => [result processing
block]
error resErr => [error processing block]
}

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the Premier Certified Partner of WSO2
Circuit Break
var rfcResult = rfcService->function(params);
match rfcResult {
http:Response res => { processing block }
error resErr => { error processing block }
}
Sample code
endpoint http:Client rfcService {
targets: {
url: “https://localhost:9443/carbon"
url: “https://cloud.yenlo.com/demo/carbon"
},
algorithm: http:ROUND_ROBIN
timeoutMillis: 1500,
circuitBreaker: {
rollingWindow: {
timeWindowMillis: 15000,
bucketSizeMillis: 3000,
},
failureThreshold: 0.1,
resetTimeMillis: 10000,
statusCodes: [400, 404, 500]
}
};
Break when more than
10% failure in each 3
second interval during
15 seconds
Wait 10 seconds to retry
after a break

21. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
Distributed TransactionSample code
endpoint http:Client rfcSrvc {
url: “https://localhost:9443/carbon",
followRedirects: {
enabled: true,
maxCount: 3
},
timeoutMillis: 1500
cache: {
enabled: true,
isShared: true
}
};
transaction with retries = 3 {
var lfcResult = localFunctionCall.do(params);
var rfcResult = check rfcSrvc->post(params);
} onretry {
codeblock handleRetry
} committed {
codeblock handleSuccess
} aborted {
codeblock handleFailure
}
Will be executed before retry

22. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
Working with Config ParamsSample code
service helloWorld bind helloWorldEP {
@http:ResourceConfig {
methods: ["GET"],
path: "/"
}
sayHello(endpoint caller, http:Request req) {
http:Response res = new;
res.setPayload("Hello World!");
caller->respond(res)
but { error e =>
log:printError("Failed to
respond to the caller", err = e) };
}
}
import ballerina/config;
import ballerina/http;
import ballerina/log;
endpoint http:Listener helloWorldEP {
port: config:getAsInt("hello.http.port",
default = 9095),
secureSocket: {
keyStore: {
path: "${ballerina.home}/bre/
security/ballerinaKeystore.p12",
password:
config:getAsString("hello.keystore.password")
}
}
};
@http:ServiceConfig {
basePath: "/hello"
}
[hello]
keystore.password=“encrypted:
{jFMAXsuMSi0CaxuDLuQjVWzMzZxQrten0652/j93Amw=}”

23. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
Cloud Native: Annotations
@kubernetes:Deployment{
name: “myContainer”,
labels: {street: "Beechavenue", housenumber:
"16", code: “1119 PT”, city: “Schiphol-Rijk",
country: "Netherlands"},
replicas: 3,
enableLiveness: “true",
livenessPort: 8243,
initialDelaySeconds: 60,
periodSeconds: 3,
imagePullPolicy: “[policy]“,
image: “/img/lac2018”,
env: {[envMap]},
buildImage: “true”,
dockerHost: “dockerHost”,
username: “user”,
password: “password”,
baseImage: “/img/dockerImage”,
push: “false”,
dockerCertPath: “[path]”,
copyFiles: “[Array of External files for docker
image]”
}
Docker image to be built
Sample code
@kubernetes:Service{
name: “name”,
labels: {labelMap},
serviceType: “ClusterIP"
}
@kubernetes:Ingress{
hostname:”https://ballerina.guides.io”,
name:”lets-dance“,
path:"/"
}
@swagger:ClientConfig {}
@swagger:ClientEndpoint {}
@swagger:ResourceInfo {}
@swagger:ServiceInfo {}
@grpc:ServiceConfig {
name: "chat",
clientStreaming: true,
serverStreaming: true
}
@websub:SubscriberServiceConfig {}

24. © 2017 – Yenlo,
the Premier Certified Partner of WSO2
Demo time
Let’s Tweet an Animated Design Quote
#LAC2018 #LetsDance #BallerinaLang

25. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
It’s the breakthrough we’ve all been waiting for
The cost and effort required for state-of-the-art distributed architectures
and for embracing cloud practices gets dramatically reduced

26. © 2018 – Yenlo,
the Premier Certified Partner of WSO2
Massimo Pezzini
Vice President and Fellow in Gartner Research
“Integration, reportedly the uncoolest thing in IT,
ultimately turns out to be the hottest”

27. Now Become a Fellow Choreographer
https://github.com/ballerina-platform
https://central.ballerina.io
https://ballerina.io