Ranga Siriwardena's Blog

WSO2 MB is a standers complaint  message broker which supports JMS and AMQP standards and it will allow interoperability between many languages. It supports two of the main standers patterns of communication. Point-to-Point messaging through queues where one application sends messages directly to another application. Publish/Subscribe pattern through topics where one application publishes messages to a topic and other applications who are subscribed to this topic will receive these messages. This post will explain how to use WSO2 ESB as a publisher and subscriber for WSO2 MB which will act as the middle hub for message exchange. Also it will explain the hierarchical topic capabilities and durable topic capabilities of WSO2 MB. As an example lets take a news publisher service which publishes various types of news. And there are subscribers who are interested on various types of news. Download and unzip WSO2 ESB 4.8.1 and WSO2 MB 2.1.0 Locate wso2mb-2.1.0/bin ...

From this post I will going to briefly introduce about one of the new features provided by WSO2 ESB . Earlier WSO2 ESB supported static registry keys where users can select a key for the mediator as a static value. But from ESB 4.0.0 users can use dynamic registry keys where users can define XPath expression to evaluate the registry key in run time. For an example let's consider XSLT mediator. With earlier static registry key based method user have to define only single XSLT file for transformation. With the use of dynamic registry key, user will be able to use XPath expressions to dynamically generate the registry key, based on the message context. So with that user can have multiple XSLT files and based on the evaluated key mediator will be able to select the required XSLT file in run time. Following is a sample usage of static and dynamic registry keys and user can use both of them according to situation.   Static Registry Key – define the exact path to find the xslt fil...