As described in the previous article, we are facing a very challenging performance issue when solving 100k row decision tables.

To view previous discussion, please click:

Solution 1: Rule Template + Xls

Solution 2: Precompile Spreadsheet Decision Table

In this article, I am going to change the mindset and change the decision table row data from rule to fact. Again I am using drools as my framework.

Solution 3: Convert Row Data to Fact, not Rule

Solution 2(Precompile the rules) helps a lot when the decision table is 10k below row size. However when the row number comes to very big such as 100k, solution 2 ‘s improvement is…

As described in my previous article, we are handling a performance issue when solving 100k row decision tables.

Solution 2: Precompile the SpreadSheet Rule

Follow the vertical thinking of solution 1, I think we can improve the situation corresponding to the problems:

1. Don’t dynamically load Excel data at runtime, let’s precompile it at build time
2. Use drools spreadsheet decision table so that it can be “version controlled” by KIE workbench;

When drools using rule template + Excel to fire rules, what it actually doing under hood is:

1. Using ExternalSpreadsheetCompiler to compile rule template and rule data( ie the Excel file) into drl(Drools rule language)
2. Drools engine…

TLDR;

How to handle 100k decision table rows in Drools?

When handling large rows of decision tables， one of the pain points is performance. In this article, I prepared a prototype setup to a simple scenario to simulate the large decision table use case and provided three solutions to utilize drools ( a rules oriented application framwork). I would focus on the decision table rule execution performance.

For the sake of explanation of the core concept of problem solving, I prepared two decision tables 10k & 100k row data to simulate decision making procedure usage in rules application.

I provide 3…

Innovation never stopped in Java land. In this article, I am going to explore a new trend of Java Framework: “Build Time Boot” techniques, which make java applications slim and run faster.

If you searched the microservice framework, you will find a lot of options like: Spring Boot, Vertx, Quarkus, Micronaut, Helidon(those are all java), GoMicro(Go), Molecular(nodejs) etc.

Do you know why so many Java framework options?

Java is a 25 years old language, so the landscape and market definitely is much larger than other languages. …

In my previous blog, I described what happened when Domain-Driven Design met Deadline Driven Design. Software design is a complicated activity. Pushing the deadline doesn’t work in most cases; cutting the software design will never work.

Not existing no-design-software, it’s either Good or Bad

Let’s first explain “the two-person job” mentioned in my previous blog. A basic question first.

Who designed your software?

A, UX designer; B, Architect; C, BA; D, Developer;

If you choose A, I would point your attention to Steve Jobs’ Quotes

“Design is not just what it looks like and feels like. Design is how it works.”

If you choose B, I would argue…

When I asked my clients who know Domain Driven Design, less than 10% would nod their heads.

However when I asked who experienced Deadline Driven Design, almost all would laugh and feel connected.

Put the cart before the horse

Let me share an experience once I delivered DDD methodology to a customer.

BA(Business Analysis) Mr. T is the one I coached for adopting event storming and DDD methodology to analyse the requirement and do the design afterwards in Lab1. After a short break, we met again for a second project Lab2.“

We were standing in front of the following map which was completed by BA Mr…