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JBoss Fuse - Fuse workshop 101 - Part Three

It's really difficult to design or architect an Integration project, especially within an Enterprise, there are so many factor to take into considerations.
  • System characteristic
  • Data mapping
  • Interface of systems
  • Risk management
  • Security 
  • And even office politics comes into play, I have to say this is the most time consuming and can quickly become nightmares be not deal carefully. 

This quickly became a headache for architects, and people constantly ask for best practice, I have to say, there are no single best practice, because it is not an ONE SIZE FIT ALL answers, integrating system is all about problem solving. 

So how do we solve an complex integration problem? YUP! you are right! break it down to smaller problem and then tackle them one by one! And fortunately this book "Enterprise Integration Patterns" by Gregor Hohpe has most of the solutions. This book "provides a consistent vocabulary and visual notation to describe large-scale integration solutions across many implementation technologies". 

To put it in my words, it's a collections of patterns, each pattern is to solve a design problem, so by implementing the patterns to the pieces of problem you have already broken down and put the patterns together will give you an idea of where to start from. Of course for every pattern it has it's pros and cons and many things to consider. That why using Camel as the tool that supports EIP will allow you to modify or refine your design with a few easy modification steps! 
For this workshop, we talk about Enterprise Integration Patterns, I will skip all the parts that talks about individual pattern, seriously, it's going to take too long, and there are so many resource on the internet that talks about them. I would recommend you visit the official EIP site to learn what each and every pattern does, and maybe read the book if you have time! It's really helpful. 

Let's look at this Ordering system. Shops from different location sending in order data, it needs to go into both inventory system to check for product availability and accounting system for finance check up. Then the inventory sends the product ready for shipment. At the same time it sends a confirmation email to the customer along with some advertisement and coupons. 


OK, so here is the problem, how do I make sure inventory and accounting system gets the message as soon as possible? what if there is something wrong with customer's payment? How do I make sure the shipments are shipped efficiently? And what about the notification system, how do I deliver it? 

Here are my thoughts on the solution, 
To make sure both inventory and accounting system receives the message at the same time, we will use the "publish and subscribe" pattern, so a copy of the message are send to all receivers. so the inventory and start the inventory check and the shipping process immediately and accounting system can start process it's finance and billing process.


If the payment ever goes wrong, a message will be send to a "invalid message channel", that will be pickup by the inventory system and cancel the shipment.  

The shipment message should be sorted according to different delivery priority and area to delivery and "aggregate" into a bigger chuck so it's easier for delivery truck to divide it's duty, and the content send to delivery system should be "filtered" so it only contains necessary data. As for notification, we also want to make sure we send it to the notification system at the same time, but send an cancelation letter or a successful letter in our "Recipient List". And as well as that, we will also "enrich" the content with coupon and the advertisement that might interest the customer. 


OK, what happen if the online shopping team comes in, and they would also like to do the same thing, but their ordering data comes in with a totally different format, so first, we will certainly reuse what we have ready done. (There is a fine line between reusing code and rewriting it all over, but here we assume the process behind is exactly the same). So by "transforming" the data the same as shops, then publish the content to the existing channel will certainly saves you lots of time!  


Slides for the workshop:

As for lab, continue from last one, this time we are going to separate the processing route for VIP and normal stock purchase. Also we want to introduce another vendor that trade with our system but with orders in one large file, we need to spilt the content before reusing our existing route! 


Lab Instructions:


Here are the other parts of the workshops!
Workshop part 1 - Camel basic and components
Workshop part 2 - Data Transformation 

Comments

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