Developing Microservices with Apache Camel

Microservices with Apache Camel

Claus Ibsen (@davsclaus)Principal Software Engineer, Red Hat

Your Speaker

Your Speaker

Principal Software Engineer at Red Hat

Apache Camel7 years working with Camel

Author of Camel in Action books

ContactE-mail: [email protected]

Twitter: @davsclaus

Blog: http://davsclaus.com

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Agenda

What is Apache Camel?

Camel Microservices

DemoStandalone

with Docker

with OpenShift 3 / Kubernetes

More Information


Quote from the website


Integration Framework


What is Enterprise Integration Patterns?

It's a book


Enterprise Integration Patterns

http://camel.apache.org/eip


EIP - Content Based Router


from newOrder


from newOrder choice


from newOrder choice when isWidget to widget


from newOrder choice when isWidget to widget otherwise to gadget


from(newOrder) choice when(isWidget) to(widget) otherwise to(gadget)


from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget);


Endpoint newOrder = endpoint("activemq:queue:newOrder");



Endpoint newOrder = endpoint("activemq:queue:newOrder");Predicate isWidget = xpath("/order/product = 'widget'");



Endpoint newOrder = endpoint("activemq:queue:newOrder");Predicate isWidget = xpath("/order/product = 'widget'");Endpoint widget = endpoint("activemq:queue:widget");Endpoint gadget = endpoint("activemq:queue:gadget");



Java Code

public void configure() throws Exception { Endpoint newOrder = endpoint("activemq:queue:newOrder"); Predicate isWidget = xpath("/order/product = 'widget'"); Endpoint widget = endpoint("activemq:queue:widget"); Endpoint gadget = endpoint("activemq:queue:gadget");

from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget) .end(); }


Java Code

import org.apache.camel.Endpoint;import org.apache.camel.Predicate;import org.apache.camel.builder.RouteBuilder;

public class MyRoute extends RouteBuilder {

public void configure() throws Exception { Endpoint newOrder = endpoint("activemq:queue:newOrder"); Predicate isWidget = xpath("/order/product = 'widget'"); Endpoint widget = endpoint("activemq:queue:widget"); Endpoint gadget = endpoint("activemq:queue:gadget");

from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget) .end(); }}


Camel Java DSL

import org.apache.camel.builder.RouteBuilder;

public class MyRoute extends RouteBuilder {

public void configure() throws Exception { from("activemq:queue:newOrder") .choice() .when(xpath("/order/product = 'widget'")) .to("activemq:queue:widget") .otherwise() .to("activemq:queue:gadget") .end(); }}


Camel XML DSL

/order/product = 'widget'


Endpoint as URIs


use file instead


Endpoint as URIs


parameters


Java DSL is just Java


XML DSL is just XML

with XSD schema for validation/tooling


Camel's Architecture


150+ Components


150+ Components

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Agenda


Camel Microservices

DemoStandalone

with Docker

with OpenShift 3 / Kubernetes

More Information

Running Camel as Microservices

StandaloneWeb Application

Camel Spring XMLApache Karaf

Camel Spring BootWildfly (wildfly-camel)

Camel CDIvert.x (vertx-camel)

Camel GuiceRest DSL

Camel Microservices

Apache Karaf

Camel Microservices

Apache Karaf

Apache Karaf
(boot)

Camel Microservices

Apache Karaf

Karaf FeaturesOSGi BundlesApache Karaf
(boot)

Camel Microservices

Apache Karaf

(boot)Karaf MavenPlugin

Camel Microservices

Apache Karaf

(boot)Karaf MavenPluginCustom Karaf
(with your app)

tar / zip file

Camel Microservices

Rest DSLUse Rest verbs

GET
POST
PUT
...

Swagger API

Pluggable Transport

Rest DSL example

Rest DSL example

Rest DSL example

Rest DSL example - add Swagger API

Agenda


Camel Microservices

DemoHello Service

Create the Camel projects

Docker

OpenShift v3

More Information

Demo - Hello Service

Hello Service


Hello Service

Hi I am New York. Hello Claus how are you today?

name=Claus


Java Standalone

Apache Tomcat

HTTP

Hello Service


Java Standalone

Apache Tomcat

HTTP

from timer to http to log

from servlet transform

Hello Service

Demo - Create the Camel Projects

Java Standalone

Apache Tomcat

HTTP



Hello Service

camel-archetype-cdicamel-archetype-web


Using Command Shell

From Eclipse


camel-archetype-web

Ready to useout of the box


camel-archetype-cdi

Not readyWe need to change he code


add netty4-http endpoint

CMD + ALT4


configure netty4-http endpoint


change route to call netty


change bean to return a name

Demo - Overview


Java Standalone

Apache Tomcat

HTTP 8080


from http transform

We are ready to run standalone

Demo - Running Standalone

mvn camel:run

Agenda


Camel Microservices

DemoHello Service


Docker

OpenShift v3

More Information

Camel and Docker

Maven ProjectDocker MavenPluginDocker Image

build

Add Docker from Command Line

Add Docker from Eclipse / IDEA

CMD + ALT4

Docker Maven Plugin in pom.xml

Build Docker Containers

mvn clean install docker:build

Build Docker Containers

After build images in local Docker repository

camel-archetype-cdi

camel-archetype-web

Agenda


Camel Microservices

DemoHello Service


Docker

OpenShift v3

More Information

Static


Java Standalone

Apache Tomcat



HTTP 8080

hostname:portis static / hardcoded

Dynamic


Java Standalone

Apache Tomcat



Service

KubernetesService

What is a Kubernetes Service

Network Connection to one or more Pods

Own fixed IP address and port

http://fabric8.io/guide/services.htmlhttp://kubernetes.io/v1.1/docs/user-guide/services.html

What is a Kubernetes Service

kube-proxy on client

http://fabric8.io/guide/services.htmlhttp://kubernetes.io/v1.1/docs/user-guide/services.html

Java Standalone

Apache Tomcat



kube-proxyKubernetesMaster

servicechanges

Service

enlist

Define Kubernetes Service

Use fabric8
command

Apache Tomcat


Service

Define Kubernetes Service

Defined in pom.xml in

Apache Tomcat


Service

Container Port = Inside Docker Container(e.g. the port of Apache Tomcat)Service Port = OutsideConsumers of Service to useName of service

Generated kubernetes.json

Apache Tomcat

from http choice setBody

Service

Use Kubernetes Services

Java Standalone


Environment VariablesHostname

Port

Injected by Kuberneteswhen starting a pod

Camel - Use Kubernetes Service

Use {{service:name}} in Camel

Java Standalone


Microservice Demo - Ready for launch!


Java Standalone

Apache Tomcat


from http transform

Service

Service definedReady to deploy to Kubernetes

Deploy - myweb

mvn -Pf8-local-deploy

Apache Tomcat

from http transform

Service

Deploy - camel-archetype-cdi

mvn -Pf8-local-deploy

Java Standalone


fabric8 web console

http://fabric8.vagrant.f8

OpenShift 3 CLI

oc get pods

docker CLI is also possibledocker imagesdocker ps

OpenShift 3 CLI

oc get services

OpenShift 3 CLI

oc logs -f

OpenShift 3 CLI

oc get routes

Scaling up / down

change controller replicas

Scaling up / down

Service Load Balancing

Agenda


Camel Microservices

DemoHello Service


Docker

OpenShift v3

More Information

More information

Apache Camel Microserviceshttp://camel.apache.org/camel-boot

Fabric8http://fabric8.io

chat room #fabric8 on freenode

Medium Fabric8 (blogs and videos)https://medium.com/fabric8-io

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Developing Microservices with Apache Camel