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POEJB3 Enterprise Application As Portal & Client Web Apps - Architecture/Design
 

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    <p><img src="https://i.stack.imgur.com/3MVHd.jpg" alt="enter image description here"></p> <p>As shown in the above pic, I have a EJB-3 Enterprise application (EAR file), which acts as a portal and holds 3 web applications (WAR files) that communicate and transact with the same datastore. These 3 webapps are not portlet implementations, but normal webapps which interact with the datastore through the Enterprise App's Persistence Layer. These webapps are developed independently and so, some of 'em use Webservices from the Enterprise App and some of 'em use EJB-Clients. </p> <p>Also, there is an other option of replacing these webapps (Web App1, Web App2 and Web App3) and using independent Enterprise Apps to communicate and transact with the database, as shown below:</p> <p><img src="https://i.stack.imgur.com/0cc17.jpg" alt="enter image description here"></p> <p>Now, my questions are:</p> <p>1) What is the best Option among the listed 2 options (above)?</p> <p>2) How does it affect when we replace those webapps acting as clients to the Enterprise App, as independent Enterprise Apps (EAR files)?</p> <p>3) What is a better model for Transaction handling, SSO functionality, Scalability and other factors?</p> <p>4) Are there are any other better models?</p> <p><strong>EDIT</strong>:</p> <p>1) In the first model, which method is a preferred way to interact with the EAR file - webservices or ejb-client jar file/library (interfaces and utility classes)?</p> <p>2) How do both models differ in memory usage (server RAM) and performance. Is there any considerable difference?</p>
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    1. COWhy are you considering these 2 options? eg is it for different deployment options? Also, how do you split data access in option 2 - does each EAR have "ownership" for it's own data, or would they each have full read/write access across the whole dataset? If separate, where are the transactional boundaries? Would each EAR only need to be concerned with it's own boundaries? What type of datastore do you have and will it be a bottleneck. Is your application predominantly read, or write. Sorry, for all the questions - I hope these don't reflect my own ignorance!
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    2. CORomski: I'm considering these 2 options, out of my own curiosity and just to find out what are best practices and which is better suited for our needs. As for your questions, yes each EAR has ownership. They are designed/developed that way, as they handle different functionality and for other business reasons. All applications are predominantly both read&write and use RDBMS, at the moment.
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    3. COAlso, please check the 'Edit' part of my original post.
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