Swarm of XeBees

Last couple of days I was at JUDCon India conference held in Bangalore where I gave a session on OpenShift. The JUDCon India was the biggest JUDCon conference ever with more than 800 attendees. Sessions were mainly on topics -- Infinispan, JBoss AS7 , OpenShift, CDI, Rules Engine, and other JBoss tools. I was mainly interested in hearing the thoughts of RedHat guys on OpenShift -- its future, comparison with Cloud Foundry, and when it will be open sourced. Read more »

Filed under: Cloud, openshift

My last assignment required me to expose soap based web service. While exploring I came to know that there are many types of web services, for example JBossWS, GlassFish Metro, Apache CXF, Axis1, Axis2 and likewise. All of them are widely used and were also promising to fulfill most of my requirements. Since I had to deploy my web service on tomcat web container, I shortlisted Axis2 and Apache CXF for comparison. While working on POC for their comparison, factors mentioned below helped me to choose the appropriate.

Factors in favor of CXF
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Filed under: Apache CXF, Java, SOAP, Web Services

Neo4j is a high-performance, NOSQL graph database with all the features of a mature and robust database. In Neo4j data gets stored in nodes connected to each other by relationship entities that carry its own properties. These relationships are very important in graphs and helps to traverse the graph and make decisions. This blog discusses the two ways to persist a relationship between nodes and also the scenario's which suits their respective usage. Spring-data-neo4j by springsource gives us the flexibility of using the spring programming model when working with neo4j database. The code examples in this blog will be using spring-data-neo4j.
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Filed under: Database, Java, Neo4j, nosql, Spring, Spring Data

As I am preparing for my JUDCon session on OpenShift one topic that I will be covering is setting up MongoDB Replica Set on OpenShift Flex. There are various reasons to setup MongoDB replication. The primary reason for replication is to ensure data survive single or multiple machine failures. The more replicas you have, the more likely is your data to survive one or more hardware crashes. With three replicas, you can afford to loose two nodes and still serve the data.Replication also helps to scale reads as you can distribute your read load accross multiple machines. There are two ways to support replication in MongoDB -- Master Slave and Replica Set. Replica Set is the recommended way to do replication and OpenShift only supports replica set.  OpenShift Flex MongoDB replica set is yet not polished so you might face issues in setting up. This blog will show steps to configure a working MongoDB replica set on OpenShift Flex. If you are not aware of MongoDB Replica Set you should first refer to the MongoDB documentation. Also you can refer to my blog on how to use MongoDB replica set with Spring. Read more »

Filed under: Cloud, openshift

XML Parsing on iPhone/iPad - Is that something your current sprint revolves around? Well if it does, this blog might help you. While parsing XMLs on device, we need to look into factors like performance and memory consumption. While googling, i found couple of XML parsing APIs including Apple's native NSXMLParser. NSXMLParser looked like this is all i need. But my requirement was also to 'write' xmls making sure that i do not compromise on performance and memory. On googling more i found couple of APIs which can provide me XML writing capabilities. I chose to explore libXML2 and KissXML.

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Filed under: Blog, cocoa touch, iPhone, Objective C