WSO2 ESB Integration with REST
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WSO2 provides an open source integration platform that enables organizations to expose existing services and applications through RESTful APIs. The platform uses the Apache Synapse ESB at its core to provide mediation capabilities. RESTful APIs in WSO2 ESB allow resources to be exposed over HTTP and dispatched based on URL patterns and HTTP verbs. This allows for building and consuming RESTful services and integrations.
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WSO2 ESB Integration with REST
- 1. WSO2 ESB Integration with REST Dushan Abeyruwan Associate Tech Lead, Integration Tech Group Ravi Undupitiya Software Engineer, Integration Tech Group
- 2. About WSO2 • Providing the only complete open source componentized cloud platform – Dedicated to removing all the stumbling blocks to enterprise agility – Enabling you to focus on business logic and business value • Recognized by leading analyst firms as visionaries and leaders – Gartner cites WSO2 as visionaries in all 3 categories of application infrastructure – Forrester places WSO2 in top 2 for API Management • Global corporation with offices in USA, UK & Sri Lanka – 200+ employees and growing • Business model of selling comprehensive support & maintenance for our products
- 3. 150+ globally positioned support customers
- 4. Background • Service Oriented Architecture (SOA) – A style of so:ware architecture that is modular, distributed and loosely coupled. – ComponenBzaBon – The main driver of SOA – Business FuncBonaliBes are implemented in different Business Components – Business Components provide their funcBonality to its consumers as a ‘Service’ with the well-‐defined service interfaces.
- 5. Background • Enterprise Service Bus (ESB) – An ESB is a middleware soluBon that enables interoperability among heterogeneous environments using a service-‐oriented model. – Stateless and Seamless IntegraBon – Standard Protocols – SOAP, REST, JSON etc. – Transports – HTTP/S, JMS, TCP, VFS etc. Source : http://graegert.com/programming/no-soa-criticism-somewhere
- 6. Under the Hood: Apache Synapse • A lightweight, open source ESB implementaBon from the ASF : hXp://synapse.apache.org • Makes up the mediaBon engine of WSO2 ESB • MulBthreaded and asynchronous message processing core • Based on a number of well known open source projects (eg: Axis2, HXp Core)
- 7. • REpresentaBonal State Transfer • An architectural Style – Not a Standard • RESTful applicaBons use HTTP requests to • post data (create and/or update) • read data (e.g., make queries) • Delete data. • REST uses HTTP for CRUD (Create/Read/Update/Delete) operaBons. Eg: TwiXer REST API • hXps://dev.twiXer.com/docs/api/1.1 What is REST?
- 8. “How OrganizaBons thinks RESTFul Apps”
- 9. “Hang in There SOAP”
- 10. Moral of the Story… • Replacing exisBng technologies is not easy • Every technology has its own strengths and weaknesses – Despite its arcane terminology, the structured descripBon capabiliBes of the WSDL standard is being praised even by hard-‐core fans of REST – No technology can be designated “universally superior”
- 11. REST API • Exposing RESTful APIs • A easy way to expose exisBng SOAP services over REST • REST à SOAP conversion • Mainly used in WSO2 API Manager
- 12. HTTP Based RESTful Interactions
- 13. IntegraBng RESTful ApplicaBons Demo
- 14. REST APIs l An API is similar to a web application hosted on the ESB l Anchored at a specific URL path (context) l /test l /dictionary l /foo/bar l Can be bound to a specific host and a port l Contains one or more resources
- 15. Resources l A RESTful resource exposed over HTTP l Similar to a proxy service but focuses on REST l Can be associated with l A set of HTTP methods - GET only, GET and POST only, All HTTP methods l A specific content type - application/xml, application/json l A particular class of clients (user agents)
- 16. Dispatching Requests to a Resource l URL patterns l Reg-Ex match l /test/* l Extension match l *.jsp l Exact match l /test/index.jsp l URI templates l /dictionary/{character}/{word} l /accounts/{accountId}/{operation} l HTTP Verbs (GET/PUT/POST/OPTIONS)
- 22. API Example
- 23. API Demo: Coffee Shop
- 24. Coffee Shop: URL Schemes l /order/{order-id} – GET, POST – Add/Update/View orders l /orders/ – GET – Retrieve Pending Order List
- 25. Coffee Shop: Add Order • POST /order/ <?xml version="1.0" encoding="UTF-8"?> <order> <drink>Caffe Misto</drink> </order> curl -v -d @order.xml -H "Content-type: application/xml" http://127.0.0.1:8281/order
- 26. Coffee Shop: Get Order • GET /order/{order-id} curl –v http://127.0.0.1:8281/order/{order-id}
- 27. Coffee Shop: List Orders • GET /orders/ curl -v http://127.0.0.1:8281/orders
- 28. API Demo: Coffee Shop Complete Tutorial: http://bit.ly/PZz6RZ
- 29. HTTP Endpoint • New in WSO2ESB 4.7.0 • Enhances RESTful support. Can be used with SOAP WS. • Support for HTTP verbs and URI-Template variables • An example: • Exposing Twitter Search API
- 30. OAuth: REST security done right • Adheres to statelessness in REST architecture.
- 31. API Management Goals l Service provider objecBves l Define APIs l Define security requirements and SLAs l Monitor API usage and SLAs l Service consumer objecBves l Discover and browse APIs l Sign up and obtain API keys l Consume APIs using the obtained keys l Monitor API usage and SLAs
- 32. Engage with WSO2 • Helping you get the most out of your deployments • From project evaluation and inception to development and going into production, WSO2 is your partner in ensuring 100% project success