API Facade Pattern with Apache Synapse
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This document discusses using the Apache Synapse open source ESB to implement the API facade pattern. It provides an overview of Synapse's key features like message routing, transformation and protocols. It describes Synapse's messaging model including mediators, sequences, APIs and endpoints. Finally, it discusses how to use Synapse to expose a non-RESTful backend like a SOAP service or database via a REST API facade.
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API Facade Pattern with Apache Synapse
- 1. API Façade Pattern with Apache Synapse Hiranya Jayathilaka hiranya@apache.org
- 2. Apache Synapse A lightweight, open source Enterprise Service Bus (ESB) Visit http://synapse.apache.org Connect and integrate heterogeneous systems
- 3. What is an ESB?
- 4. Key Features of Synapse Message routing Message filtering Message transformation Message enrichment Protocol switching Load balancing Fail-over routing QoS enforcement Service virtualization Traffic throttling Task scheduling
- 5. Supported Protocol/Standards Communication protocols (Transports) HTTP/S, E-Mail (POP/IMAP), JMS,AMQP, FIX, FTP and other file transfer protocols, RawTCP and UDP and more… Message formats (Content exchange formats) XML, SOAP, JSON, HTML, Plain text, Hessian, HL7,Various binary formats and more… Other JDBC/SQL,WSDL and otherWS-* standards, REST, SNMP, JMX
- 6. Synapse Messaging Model Several types of configurable and composable constructs Mediators Sequences Proxy Services APIs Endpoints Templates Message stores and processors
- 7. Mediators Smallest configurable message processing unit in Synapse Synapse ships with a wide range of built-in mediators Mediator Input Message Output Message Config
- 8. Sequences An ordered list of mediators Provides the “message flow” abstraction Log Mediator Header Mediator Send Mediator
- 9. APIs/Proxy Services Connects a client application to a backend service Comprised of several sequences In sequence – Processes requests from client Out sequence – Processes responses from the service Fault sequence – Handles errors Client Application Backend Service API/Proxy Service In Sequence Out Sequence
- 10. Synapse Configuration XML-based metalanguage Simple and intuitive – Protocol and message format agnostic programming model Supports the familiar constructs of a programming language If-Then, Switch-Case,Try-Catch Reusable function-like constructs Hot deploy and hot update
- 11. API Façade Pattern Expose a non-RESTful application through a REST API Example use cases Expose a SOAP service as a RESTful service Expose a database as a service Expose a legacy system as a service
- 13. Questions?
- 14. References Apache Synapse – http://synapse.apache.org WSO2 ESB - http://wso2.com/products/enterprise-service-bus/ Demo artifacts - https://github.com/hiranya911/rest-gateway- demo Demo documentation - https://rest-gateway- demo.readthedocs.org/en/latest/ API façade pattern - http://asanka.abeysinghe.org/2013/04/pragmatic-approach-to-api- facade-pattern.html