Sashi's Blog

Open Source ESB Market Today, open source solutions giving a significant competition to the proprietary software solutions. Same applies for the ESB software. There are number of open source ESB solutions available in the market, but the WSO2 ESB is the only ESB solution to be claimed as a 100% Open Source ESB solution in this competitive market. It was licensed under Apache License versions 2.0 . When we say 100% Open Source ESB, there can be several questions coming in to your mind. Below will answer your questions. Is the entire source code available freely? How about the Enterprise edition of WSO2 ESB? There is no such concept called Enterprise WSO2 ESB and Open Source WSO2 ESB as you have come across with other open source ESB solutions. In WSO2 ESB, we provide the entire source code available for the users without restricting the use of any available feature. Managing the success with Open Source Model When it comes to Open Source ESB, you may have some doubts

Over the time business operations and processes growing in a rapid rate which requires the organizations to focus more on the integration of different applications and reuse the services as much as possible for maintainability. The WSO2 ESB (Enterprise Service Bus) will seamlessly integrate applications, services, and processes across the platforms, if we simplify it, ESB is a collection of enterprise architecture design patterns that is catered through one single product. Lets see when you need to consider using WSO2 ESB for your business; 1. You have few applications/services working independently and now you need to integrate those 2. When you want to deal with multiple message types and media types 3. When you want to connect and consume services using multiple communication protocols (ex: jms, websockets , FIX) 4. When you want to implement Enterprise Integration scenarios such as route messages to suitable back-end or aggregate the responses coming form the back-end

WSO2 products managed internally using defined SOAP web services named as admin services. This blog will describe how to call the admin services and perform operation with out using the Management Console. Note - I will be using WSO2 Enterprise Integrator to demonstrate this. Lets look at how to access the admin services in wso2 products. By default the admin services are hidden from the user. To enable the admin services, 1. Go to <EI_HOME>/conf/carbon.xml and enable admin services as follows <HideAdminServiceWSDLs>false</HideAdminServiceWSDLs> 2. Now start the EI server using ./integrator.sh -DosgiConsole When the server is started click 'Enter' and you will be directed to the osgi console mode. 3. To search the available admin services, Add 'listAdminServices' in the osgi console.This will list down the available admin services with the URL to access the admin services. Access Admin Service via SOAP UI 4. You can ac

Introduction to Aggregator Pattern Aggregator is one of the basic pattern defined in SOA patterns and EIP patterns that can be used to define more complex scenarios. According to the EIP patterns “The Aggregator is a special Filter that receives a stream of messages and identifies messages that are correlated. Once a complete set of messages has been received (more on how to decide when a set is 'complete' below), the Aggregator collects information from each correlated message and publishes a single, aggregated message to the output channel for further processing’ [1] Use Case Let’s assume a Salesperson wants to get the Customer's Personal Information, Contact Information and the Purchasing Behavior for a given customer ID through the Customer Relationship Management (CRM) system for the upcoming direct marketing campaign. In a real world scenario, the  CRM system needs to call multiple backend services to get the required information and aggregate the re

WSO2 Data Services Server(DSS) is a platform for integrating data stores, creating composite data views and hosting data in different sources such as REST style web resources. This blog guides you through the process of extracting the data using a data services when nested User Defined Types (UDT) used in a function. Lets take the following oracle package that returns a nested UDT. When a nested UDT (A UDT that use standard data types and other UDT in it) exists in the oracle package, oracle package should be written in a way that it returns a single ref cursor, as DSS do not support nested UDTs out of the box. Lets take the following oracle package that includes a nested UDT called 'dType4'. In this example I have used Oracle DUAL Table to represent the results of multiple types included in the 'dType4'. Sample Oracle Package create or replace TYPE dType1 IS Object (City VARCHAR2(100 CHAR) ,Country VARCHAR2(2000 CHAR)); / create or replace TYPE dType2 IS T

ZAP Tool Zed Attack Proxy is one of the most popular security tool that used to find security vulnerabilities in applications. This blog discuss how we can use the ZAP tool to intercept and modify the HTTP and HTTPS traffic. Intercepting the traffic using the ZAP tool Before we start, lets download and install the ZAP Tool. 1) Start the ZAP tool using / zap.sh 2) Configure local proxy settings  To configure the Local Proxy settings in the ZAP tool go to Tools -> Options -> Local Proxy and provide the port to listen. 3) Configure the browser  Now open your preferred browser and set up the proxy to listen to above configured port. For example: If you are using FireFox browser browser proxy can be configured by navigating to "Edit -> Preferences -> Advanced -> Setting -> Manual Proxy Configuration" and providing the same port configured in the ZAP proxy 4) Recording the scenario Open the website that you want to intercept using t