Scala in our BRMS

Scala in our BRMS
~BRMS開発でのScala利用事例~
BRMS: Business Rule Management System

三菱UFJインフォメーションテクノロジー株式会社
ITプロデュース部
土佐鉄平
Mitsubishi UFJ Information Technology, Ltd.
IT Production Dept.
Teppei Tosa

All Rights Reserved,Copyright © 2013 Mitsubishi UFJ Information Tecnology,Ltd. 1

Agenda
1. About MUFG, MUIT
2. About BRMS
3. About our original BRMS, “BIWARD”
4. How we have used Scala’s features in
BIWARD
Using the Recursive Call function
Using DSL
5. Our thoughts on Scala in developing
Enterprise Applications

About MUFG 出典：MUFG Corporate Review
http://www.mufg.jp/english/ir/annualreport/2012mufg/pdf/mar/cr1202.pdf


About MUIT
(Mitsubishi UFJ Information Technology, Ltd.)
Started on July 1st, 2009 when these three companies merged
Tokyo Mitsubishi Information Technology, Ltd.
UFJ Hitachi Systems, Ltd.
UFJIS, Ltd.
For Bank Systems
Amount of Capital: 181 million yen
Capital from Bank of
For Securities’ system For Credit Cards
Tokyo Mitsubishi UFJ: 85%
Capital from MUFG: 15%

Currently over 1500 employees
For Lease Systems For MUFG’s Members

For outside financial institutions


About BRMS
(Business Rule Management System)
アプリケーションから、ビジネスルール（業務判断ロジック）を切出して実行・設計・
管理を行うためのフレームワーク
BRMS is a framework that separates business logic from software
applications and executes, designs and manages that logic.
WEB/AP Server Executes
Executes
Business Application
Rule Engine DB
Framework （ex. JavaEE）
Server
Client
WEB／AP Server （ex. Cosminexus、Websphere、GlassFish）

OS （ex. RedhatLinux、AIX）

Designs
Designs Rule Base Manages
Manages

The Reason for Creating an Original BRMS
金融関連のBRMS事例は保険のバックオフィス業務への適用が多いが、銀行では対面型業務での適用ニーズがあり、市場
製品では「前進判断」機能のみのため、これに応えることができない。
In the financial industry, there are some back-offices at insurance companies that use BRMSs. However, all banks
have to use BRMS for their teller-window type operations. Other BRMS products cannot fulfill our needs because
they have only “forward execution” functions.

Back-office Type
Input operations are fixed.

Papers

The system calculates how
Rule Engine payments need to be made
based on accident and
contract information.


The Reason for Creating an Original BRMS
金融関連のBRMS事例は保険のバックオフィス業務への適用が多いが、銀行では対面型業務での適用ニーズがあり、市場
製品では「前進判断」機能のみのため、これに応えることができない。
In the financial industry, there are some back-offices at insurance companies that use BRMSs. However, all banks
have to use BRMS for their teller-window type operations. Other BRMS products cannot fulfill our needs because
they have only “forward execution” functions.

Back-office Type Teller-window Type
Input operations are fixed. At teller-windows, we interact directly with
customers, so we require a BRMS with not only
“forward execution” but also “backward execution”.

Papers

Sorry, we can’t authenticate
you with this kind of ID.
【forward execution】
】
So, what should I do?

If you have a driver’s license or a
health insurance ID card…
The system calculates how
Rule Engine payments need to be made 【backward execution】
】
based on accident and
I have a health
contract information.
insurance ID card.

Algorithm for BIWARD
Logic operating in a TREE form


Logic operating in a TREE form
Forward Execution


Logic operating in a TREE form Logic operating as a NETWORK
Forward Execution


Forward Execution Forward Exec.


Forward Execution Forward Exec. Backward Exec.


Forward Execution Forward Exec. Backward Exec. Biward Exec.


Example: Logic for Authentication
Conditions Result
Bring a Have a Bring a
Can authenticate
driver’s license home loan resident card

YES YES
YES
YES NO NO

NO YES

NO NO


Internal Structure of Logic
Root :Node

Conditions Result
Bring a Have a Bring a
Can authenticate
driver’s license home loan resident card

Y
Y
Y Y
N

N
N
N


BIWARD walks on nodes recursively.
BIWARDはRootNodeからスタートして、RootNodeまでを辿る
辿ったNodeを記録しながら、「walk」関数を再帰的に処理していき、
最終的に記録したNodeを結果として応答
Scalaによって、こういった処理を非常にシンプルに構築

BIWARD can “walk” on the network in both directions from the
Root Node and back to the Root Node.
The nodes use the “walk” function to call one another recursively.
BIWARD records the nodes that have been “walked” through,
then returns the results by displaying the recorded nodes.
Thanks to Scala, we were able to create this program very
elegantly.


Steps of Creating Rules

Compiles
Compiles
XML register
register Scala and
and
packages
packages
JAR

Exported from WEB-UI
or input by the user


Using Scala’s Parser
BIWARD parses these conditional expressions with Scala’s DSL function.
<rule id=“rule1” … >
<parameters>
運転免許証持参有無”
運転免許証持参有無
<booleanParameter id=“hasDriversLicence” label=“運転免許証持参有無 … />
…
</parameters>
<results> Not only boolean, but
<booleanResult id=“canAuthenticate” label=“本人確認可否本人確認可否”/>
本人確認可否 also strings, numbers
</results> and date types in
<patterns> conditional expressions.
<pattern>
<conditions>
<condition … ><![CDATA[ param(“hasDriversLicense”)==true ]]></condition>
</conditions>
<results>
<booleanResult id=“canAuthenticate”>true</booleanResult>
</results>
</pattern>
… Exported Scala Code
Condition(Equal(
</patterns>
BooleanParameter(“”“9”“”, “”“bringDriversLicense”“”,
</rule> List(BooleanValue(true, """Yes"""), BooleanValue(false, """No"""))),
BooleanValue(true, """Yes""")
)),

Thoughts on Scala
高生産性を確かに実感
Javaとの親和性メリットは大きい
ScalaプログラムがJavaリソースを利用するという観点はもちろん、
Javaに対してScalaリソースを提供するという観点でもメリット大きい。
言語仕様が強力で、標準言語とするにはまだまだハードル高い
Javaの置き換えではなく、ポイントを抑えた部分的な活用が有効

Achieve a higher level of productivity
Compatibility with Java is a strong merit
Scala can use Java as a library, and Java can use Scala the same way.
As a result of its elaborate syntax, it will still be difficult to adopt
Scala as the standard.


Our Goal for Scala
DSLやJavaAPIを通した機能提供を前提に、より汎
用的な機能の開発にScalaを活用
To develop universal features with Scala and
supply them using DSL or Java API
DSL

Business Application Common Parts （Scala）
(Java) Java API

Common Parts （Java）

Specific features for business Universal features

御静聴ありがとうございました
Thank you for listening


Scala in our BRMS

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