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Tags/Keywords : example-applications-integrated - Mule-ESB - Open-Source-Project-Ideas Example
Author : Amit
Date (Year/Month/Date): 2010-03-16 Example on using Mule ESB Mule ESB (Enterprise Service Bus) A open source framework for ESB. To my understanding ESB may be one choice where there is a need for integrating many applications, without really changing the way these application has support for data communication / channel, data format. To give an example, suppose an application A provides catalog of books and expose these details as web service API with a data format in XML form, while another application B has a email based functionality, that takes a flat file as an input and sends those data to appropriate recipient in HTML format. In this scenario, what do you think in terms of integrating these two applications without changing any of these applications? Sounds weird, isn't it!! I am little bit confused here. Let me think again, there is one application that takes an input as a search query text, then it returns search result in form of XML file as output. And another application requires a flat file as input and sends that file as email in HTML format as an output. So if i think of creating an adapter in between these two application, then what this adapter has to do?? I think, this adapter has to have API for invoking application A, take the output XML file, and then create a flat file and then send that file to some folder in the file system, from where the other application will pick up the flat file. I think this is quite okay and achievable, but wait, what will happen if there is another change request whereby there is another application that needs the search result from the application A to be send to it as JMS message in a queue. Now I may have to go back to this hypothetical adapter and change again to incorporate this support for another communication channel, that is JMS queue. Basically in this process we may think of reusing the logic for converting the XML data to the flat file data, and just try to plug-in the API for sending JMS message to a predefined message queue. So there is need for some external configuration support for dynamically managing any change in destination for sending the flat file either to file system or JMS Queue or both or any more channel in future. After searching for more help I came across an Open Source Framework MULE, this framework has many such integrating prerequisites already implemented and ready to use. It has many transport channel support, along with in-built router and transformer for converting/transforming data from one format to another. Based on router configuration, Mule can be used to de-couple external interfaces such as sources and destinations. Mule has provision for adding service component for providing a way to apply business logic, if any, before routing the final message to its destination. Before starting to explore Mule for use as ESB, I tried studing thoroughly following features and Mule specification as mentioned in this link below: After evaluating Mule its time for me to start exploring Mule ESB more closely and if possible to come up with a simple POC in order to understand how and what it takes to integrate two separate application, those are build separately with completely separate functionalities, to integrate seemlessly without touching/changing even a single file from either applications. So to start with I decided to create two applications, as stated earlier in this page, one application is deployed as web service and the other application is a utility or a standalone application deployed as a JAR file. One of the application that has a web service, I decided to use Apache AXIS to deploy a rapid to compile, build, test and deploy. Application A: a simple application for searching through a predefined table from a local database, and returning the result as XML content. Application B: A simple Java application using SMTP mail service to send the email in HTML format. I am presently working on these two application and over a period of time span I shall explore on using Mule ESB to integrate these two applications. Anyone having any suggestions or ideas and want to share over here, please do so.

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