Open Source Data Services for Strategic SOA utilising WSO2 Data Services Server

Open Source Data Services for
Strategic SOA
utilising
WSO2 Data Services Server
Sumedha Rubasinghe
2009 Air Force Information Technology Conference
Montgomery, Atlanta

Agenda

SOA & Enterprise Data

Need for SOA Data Services

Introduction

Features

Architecture

Use Cases

Getting started & help

Introducing Mattson ...
Hi..
Mattson here..
I am an architect

My manager wants
to see salary increments
done in HRM system to be
reflected in Payroll....

These systems do not
support a programmable
interface..

Oh..Payroll system is using
an Informix database while
HRM writes to a MSSQL
database...

Another scenario

Build a Travel Expense Management System

HRM – MSSQL

Training Mgt – Spreadsheet

Payroll - Informix

Ways of solving

Method 1
– Create a new data store
– Pull relevant data from HRM, Payroll & Training Mgt
Systems
– Store it to match new application’s requirements
– Now comes another application…
– More overhead
– Redundant data
• Inconsistency
• Update anomalies

Ways of solving (contd..)

Method 2
– Connect to 3 data sources & extract data
– Three different access mechanisms

Data access mechanisms

Direct access to databases (JDBC,ODBC,..etc)

Use of O/R mapping frameworks (Hibernate,
Ibatis,...)

Enterprise Java Beans (EJBs)

CORBA

Custom APIs

Positioning of data access code..

Application developers like to deal with
business process related logic

Changes in data source configuration

Should be transparent to application logic

Should have minimal (if not any) effect on business
logic

Method 2
Concerns
− Data access code VS business logic implementation
− Difficult to reuse
− Difficult to maintain
− Difficult to test
− Error prone

Ways of solving... (contd)
Method 3
− Single layer to fulfill enterprise data access
requirements (Data Services)
Governed by,
− More and more data being generated
− Growing demand for consolidated, consistent
information
− Mashups
− Interoperability & standards

Data Services?
Tell me about it...

Data Service ?
Well defined request/response format
Encapsulates data oriented logic
Loose coupling (application & data store)
Data store specific configurations
Management & QoS features

Simple Example

Expose Employee Contact data in a MySQL
database table as a data service

Table Structure

Data Service Configuration
<data name="ContactInfoService">
   <config>
      <property name="org.wso2.ws.dataservice.driver">com.mysql.jdbc.Driver</property>
      <property
name="org.wso2.ws.dataservice.protocol">jdbc:mysql://localhost:3306/dataservice_sample</property>
      <property name="org.wso2.ws.dataservice.user">dsuser</property>
      <property name="org.wso2.ws.dataservice.password">user123</property>
      <property name="org.wso2.ws.dataservice.minpoolsize">1</property>
      <property name="org.wso2.ws.dataservice.maxpoolsize">5</property>
   </config>

   <query id="contactInfoQuery">
      <sql>select firstName,lastName,extension,email from employees where lastName = ?</sql>
      <param name="name" sqlType="STRING" />
      <result element="Employees" rowName="ContactInfo">
         <attribute name="LastName" column="lastName" />
         <element name="FirstName" column="firstName" />
         <element name="Extension" column="extension" />
         <element name="Email" column="email" />
      </result>
   </query>

   <operation name="getContactInformation">
      <callquery href="contactInfoQuery"        >
         <withparam name="name" queryparam="name" />
      </callquery>
   </operation>
</data>

Data Services Description Language

In-house developed language for writing data
services

Maps service requests to your SOA to queries
operating on your database objects (tables,
views, procedures & functions)

Maps query results to XML responses

Available online @
http://wso2.org/wiki/display/wsf/Data+Servic
es+and+Resources

WSDL for the service
http://<IP>:<PORT>/services/ContactInfoService?wsdl

Architecture

Challenges

RDBMS – specific or generic JDBC drivers

Directories – specific drivers, API

Flat files, Spread sheets – different APIs

Different data types

Access control mechanisms

Architecture

Data Services are SOA equivalent of the Data
Access Object(DAO) Pattern

DS deal with different data sources similar to
what DAO does

But, DS operate on a different layer

Accessing a data service – Java Client

Accessing a data service – REST
http://198.18.191.140:9763/services/DataServic
eSample1/employeesByNumber/1001

Accessing a data service – Try It

Monitoring
– Monitor System statistics
– Running logs
– Message Tracing
– Dynamically configurable Logger
– Exposes statistics via JMX
– Dashboard – Google Gadgets

Use Case 1

A mashup/ javascript/ Google Gadget wants to
access data in a backend database

Use Case 2

Re-using existing Master Data

Use Case 3

Master Data Update

Use Case 4

Content filtering based on logged in user

Use Case 5

Service enabling enterprise data

Use Case 6

Integrating with an external system

That's lot of information...
Now I would like to try these out
myself. How do I get started?

How to get started?

Download binary distribution from
– http://wso2.org/projects/data-services-server/java

Latest is v2.0

Unzip
• Run bin/wso2server.sh (on Unix) or
bin/wso2server.bat (on Windows)
• Management console
– https://localhost:9443/carbon
– admin/admin

How to get help?

Online forum(http://wso2.org/forum/404)

Mailing list (ds-java-user@wso2.org)

Active community of external users

Ample free documentation on wso2.org

If needed, we provided commercial support on
– Getting started
– Deployment
– Custom development
– Production support

I would like to have some
URLs for reference.

Useful references

WSO2 Oxygen Tank for Web Service Developers
– http://wso2.org

Data Services HOWTOs Page
– http://wso2.org/library/3183

WSO2 Data Services project page
– http://wso2.org/projects/data-services-server/java

Summary

•
Introduced WSO2 Data Services
•
Features
•
Use cases
•
Getting started

Thank you
sumedha@wso2.com
(on behalf of WSO2 DS team)

Open Source Data Services for Strategic SOA utilising WSO2 Data Services Server

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