Developing Microservices with Apache Camel
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Red Hat Microservices Architecture Day - New York, November 2015. Presented by Claus Ibsen. Apache Camel is a very popular integration library that works very well with microservice architecture. This talk introduces you to Apache Camel and how you can easily get started with Camel on your computer. Then we cover how to create new Camel projects from scratch as microservices, which you can boot using Camel or Spring Boot, or other micro containers such as Jetty or fat JARs. We then take a look at what options you have for monitoring and managing your Camel microservices using tooling such as Jolokia, and hawtio web console.
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Developing Microservices with Apache Camel
- 1. Microservices with Apache Camel Claus Ibsen (@davsclaus) Principal Software Engineer, Red Hat
- 2. Your Speaker
- 3. Your Speaker ● Principal Software Engineer at Red Hat ● Apache Camel ● 7 years working with Camel ● Author of Camel in Action books ● Contact ● E-mail: cibsen@redhat.com ● Twitter: @davsclaus ● Blog: http://davsclaus.com
- 4. Shameful Advertisement http://manning.com/ibsen2 Coupon Code (39% discount) camel39
- 5. Agenda ● What is Apache Camel? ● Camel Microservices ● Demo ● Standalone ● with Docker ● with OpenShift 3 / Kubernetes ● More Information
- 6. What is Apache Camel? ● Quote from the website
- 7. What is Apache Camel? ● Integration Framework
- 8. What is Apache Camel? ● What is Enterprise Integration Patterns? It's a book
- 9. What is Apache Camel? ● Enterprise Integration Patterns http://camel.apache.org/eip
- 10. What is Apache Camel? ● EIP - Content Based Router
- 11. What is Apache Camel? from newOrder
- 12. What is Apache Camel? from newOrder choice
- 13. What is Apache Camel? from newOrder choice when isWidget to widget
- 14. What is Apache Camel? from newOrder choice when isWidget to widget otherwise to gadget
- 15. What is Apache Camel? from(newOrder) choice when(isWidget) to(widget) otherwise to(gadget)
- 16. What is Apache Camel? from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget);
- 17. What is Apache Camel? Endpoint newOrder = endpoint("activemq:queue:newOrder"); from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget);
- 18. What is Apache Camel? Endpoint newOrder = endpoint("activemq:queue:newOrder"); Predicate isWidget = xpath("/order/product = 'widget'"); from(newOrder) .choice() .when(isWidget).to(widget) .otherwise().to(gadget);
- 19. What is Apache Camel? 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);
- 20. What is Apache Camel? ● 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(); }
- 21. What is Apache Camel? ● 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(); } }
- 22. What is Apache Camel? ● 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(); } }
- 23. What is Apache Camel? ● Camel XML DSL <route> <from uri="activemq:queue:newOrder"/> <choice> <when> <xpath>/order/product = 'widget'</xpath> <to uri="activemq:queue:widget"/> </when> <otherwise> <to uri="activemq:queue:gadget"/> </otherwise> </choice> </route>
- 24. What is Apache Camel? ● Endpoint as URIs <route> <from uri="file:inbox/orders"/> <choice> <when> <xpath>/order/product = 'widget'</xpath> <to uri="activemq:queue:widget"/> </when> <otherwise> <to uri="activemq:queue:gadget"/> </otherwise> </choice> </route> use file instead
- 25. What is Apache Camel? ● Endpoint as URIs <route> <from uri="file:inbox/orders?delete=true"/> <choice> <when> <xpath>/order/product = 'widget'</xpath> <to uri="activemq:queue:widget"/> </when> <otherwise> <to uri="activemq:queue:gadget"/> </otherwise> </choice> </route> parameters
- 26. What is Apache Camel? ● Java DSL is just Java
- 27. What is Apache Camel? ● XML DSL is just XML ● … with XSD schema for validation/tooling
- 28. What is Apache Camel? ● Camel's Architecture
- 29. What is Apache Camel? 150+ Components
- 30. What is Apache Camel? 150+ Components
- 32. +
- 33. + +
- 34. + + +
- 35. = + + +
- 36. Agenda ● What is Apache Camel? ● Camel Microservices ● Demo ● Standalone ● with Docker ● with OpenShift 3 / Kubernetes ● More Information
- 37. Running Camel as Microservices Standalone Web Application Camel Spring XML Apache Karaf Camel Spring Boot Wildfly (wildfly-camel) Camel CDI vert.x (vertx-camel) Camel Guice Rest DSL
- 48. Camel Microservices ● Apache Karaf
- 49. Camel Microservices ● Apache Karaf Apache Karaf (boot)
- 50. Camel Microservices ● Apache Karaf Karaf Features OSGi Bundles Apache Karaf (boot)
- 51. Camel Microservices ● Apache Karaf Karaf Features OSGi Bundles Apache Karaf (boot) Karaf Maven Plugin
- 52. Camel Microservices ● Apache Karaf Karaf Features OSGi Bundles Apache Karaf (boot) Karaf Maven Plugin Custom Karaf (with your app) tar / zip file
- 53. Camel Microservices ● Rest DSL ● Use Rest verbs GET POST PUT ... ● Swagger API ● Pluggable Transport
- 54. Rest DSL example
- 55. Rest DSL example
- 56. Rest DSL example
- 57. Rest DSL example - add Swagger API
- 58. Agenda ● What is Apache Camel? ● Camel Microservices ● Demo ● Hello Service ● Create the Camel projects ● Docker ● OpenShift v3 ● More Information
- 59. Demo - Hello Service Hello Service
- 60. Demo - Hello Service Hello Service Hi I am New York. Hello Claus how are you today? name=Claus
- 61. Demo - Hello Service Java Standalone Apache Tomcat HTTP Hello Service
- 62. Demo - Hello Service Java Standalone Apache Tomcat HTTP from timer to http to log from servlet transform Hello Service
- 63. Demo - Create the Camel Projects Java Standalone Apache Tomcat HTTP from timer to http to log from servlet transform Hello Service camel-archetype-cdi camel-archetype-web
- 64. Demo - Create the Camel Projects ● Using Command Shell ● From Eclipse
- 65. Demo - Create the Camel Projects ● camel-archetype-web Ready to use out of the box
- 66. Demo - Create the Camel Projects ● camel-archetype-cdi Not ready We need to change he code
- 67. Demo - Create the Camel Projects ● add netty4-http endpoint CMD + ALT 4
- 68. Demo - Create the Camel Projects ● configure netty4-http endpoint
- 69. Demo - Create the Camel Projects ● change route to call netty
- 70. Demo - Create the Camel Projects ● change bean to return a name
- 71. Demo - Overview ● camel-archetype-cdi camel-archetype-web Java Standalone Apache Tomcat HTTP 8080 from timer to http to log from http transform We are ready to run standalone
- 72. Demo - Running Standalone mvn camel:run
- 73. Agenda ● What is Apache Camel? ● Camel Microservices ● Demo ● Hello Service ● Create the Camel projects ● Docker ● OpenShift v3 ● More Information
- 74. Camel and Docker Maven Project Docker Maven Plugin Docker Image build
- 75. Add Docker from Command Line
- 76. Add Docker from Eclipse / IDEA CMD + ALT 4
- 77. Docker Maven Plugin in pom.xml
- 78. Build Docker Containers ● mvn clean install docker:build
- 79. Build Docker Containers ● After build images in local Docker repository camel-archetype-cdi camel-archetype-web
- 80. Agenda ● What is Apache Camel? ● Camel Microservices ● Demo ● Hello Service ● Create the Camel projects ● Docker ● OpenShift v3 ● More Information
- 81. Static ● camel-archetype-cdi camel-archetype-web Java Standalone Apache Tomcat from timer to http to log from servlet transform HTTP 8080 hostname:port is static / hardcoded
- 82. Dynamic ● camel-archetype-cdi camel-archetype-web Java Standalone Apache Tomcat from timer to http to log from servlet transform Service Kubernetes Service
- 83. What is a Kubernetes Service ● Network Connection to one or more Pods ● Own fixed IP address and port http://fabric8.io/guide/services.html http://kubernetes.io/v1.1/docs/user-guide/services.html
- 84. What is a Kubernetes Service ● kube-proxy on client http://fabric8.io/guide/services.html http://kubernetes.io/v1.1/docs/user-guide/services.html Java Standalone Apache Tomcat from timer to http to log from servlet transform kube-proxy Kubernetes Master service changes Service enlist
- 85. Define Kubernetes Service ● Use fabric8 command Apache Tomcat from servlet transform Service
- 86. Define Kubernetes Service ● Defined in pom.xml in <properties> Apache Tomcat from servlet transform Service Container Port = Inside Docker Container (e.g. the port of Apache Tomcat) Service Port = Outside Consumers of Service to use Name of service
- 87. Generated kubernetes.json Apache Tomcat from http choice setBody Service
- 88. Use Kubernetes Services Java Standalone from timer to http to log ● Environment Variables ● Hostname ● Port Injected by Kubernetes when starting a pod
- 89. Camel - Use Kubernetes Service ● Use {{service:name}} in Camel Java Standalone from timer to http to log
- 90. Microservice Demo - Ready for launch! ● camel-archetype-cdi camel-archetype-web Java Standalone Apache Tomcat from timer to http to log from http transform Service Service defined Ready to deploy to Kubernetes
- 91. Deploy - myweb ● mvn -Pf8-local-deploy Apache Tomcat from http transform Service
- 92. Deploy - camel-archetype-cdi ● mvn -Pf8-local-deploy Java Standalone from timer to http to log
- 93. fabric8 web console ● http://fabric8.vagrant.f8
- 94. OpenShift 3 CLI ● oc get pods docker CLI is also possible docker images docker ps
- 95. OpenShift 3 CLI ● oc get services
- 96. OpenShift 3 CLI ● oc logs -f <pod-name>
- 97. OpenShift 3 CLI ● oc get routes
- 98. Scaling up / down ● change controller replicas
- 99. Scaling up / down ● Service Load Balancing
- 100. Agenda ● What is Apache Camel? ● Camel Microservices ● Demo ● Hello Service ● Create the Camel projects ● Docker ● OpenShift v3 ● More Information
- 101. More information ● Apache Camel Microservices ● http://camel.apache.org/camel-boot ● Fabric8 ● http://fabric8.io ● chat room #fabric8 on freenode ● Medium Fabric8 (blogs and videos) ● https://medium.com/fabric8-io