Sunday, May 25, 2014

Connecting the Real World and World of Computing with a Complete Cloud-Centric IOT Model

IOT or Internet of Things is creating a lot of buzz in the computer world these days. And i also started to like IOT and read about it a bit. I wrote an article about IOT and a cloud centric model that would allow achieve a sustainable IOT architecture

In this article, we first take a look at IOT in general and its key component. It will also discuss a cloud-centric model for IOT and look at how the WSO2 product stack fits into this picture. We also focus on how the cloud-centric IOT model can be applied to real-world IOT applications.

Please find the article in the WSO2 library - Connecting the Real World and World of Computing with a Complete Cloud-Centric IOT Model

Friday, April 18, 2014

Simple log analysis with Apache Spark Java API

In this post we will try to redo the sample that we did in my previous post Simple log analysis with Apache Spark, using the Spark JAVA api and since i am more accustomed to maven we will create a simple maven project to accomplish this task. For this post i will not use a separate Spark cluster, we will just use an embedded Spark that will automatically startup a server when running the code.

First lets create a new maven project. I am using Intellij Idea. I will name my project LogAnalizer. The first thing you would need to do is add the maven dependencies to your pom file. To do this add the following lines into the pom.xml file in your newly created Maven project. You will also need to add the repository.

            <id>Akka repository</id>
        <dependency> <!-- Spark dependency -->

Now lets take a look at the Java class, This where all the magic happens. since this a very basic example i will explain the main parts of the code. What the code will do is read a set of log files that i have collected into one folder and first it will filter and create an RDD that only contains the "ERROR" sections of the log and then we will further filter the error logs and find the errors that contain a specific string in this case that String would be "SequenceAdmin". 

Below is the code 

package org.pulasthi.spark;


import java.util.List;

public class LogAnalizer {
    private static String logFolderPath = "/home/pulasthi/work/logs";

    public static void main(String[] args) {
        JavaSparkContext sc = new JavaSparkContext("local[4]", "Log Analizer", "/home/pulasthi/work/spark/spark-0.9.1/", new String[]{"target/logAnalizer-1.0-SNAPSHOT.jar"});
        JavaRDD logs = sc.textFile(logFolderPath);

        JavaRDD errors = logs.filter(new Function() {
            public Boolean call(String s) throws Exception {
                return (s.contains("ERROR")) ? true : false;

        JavaRDD sequenceAdmin = errors.filter(new Function() {
            public Boolean call(String s) throws Exception {
                return (s.contains("SequenceAdmin")) ? true : false;

        List list = sequenceAdmin".take(10);
        for (String s:list) {



First we need to initialize a Spark Context this is done in the first line. to get a better understanding of the parameters sent to the constructor take a look at the official documentation - Spark Programming Guide. Its in Scala but its practically same as JAVA hence you don't need to know Scala to understand the documentation. In this code we have done two filters to create the "errors" RDD and the "sequenceAdmin" RDD. And at last we have printed the first 10 results that are in the "sequenceAdmin" RDD. You can also take a look at the JAVA documentation - Java Programming Guide.

Wednesday, February 19, 2014

WSO2 ESB - The Fastest ESB

In any middleware stack the ESB plays an very important role. And WSO2 ESB Again has proven to be the Fastest ESB available out there . The latest performance round ( 7.5 ) that compared the WSO2 ESB with other known ESB's have proven that WSO2 ESB outperforms all the other ESB in all the areas. Take a look at the diagrams below to check the comparisons.

You can take a look at the complete report here - ESB Performance Round 7.5. If you are new to WSO2 ESB take look at the product here - WSO2 Enterprise Service Bus


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