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Step by Step Web Service guide

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To learn more on web services let’s first understand the concept of the service oriented architecture.   What is Service Oriented Architecture? Service Oriented Architecture is a software design principle and architectural design pattern to represent self contained unit of functionalities called service. SOA promotes design principles involving loose coupling, reusablility and coarse grained services. In Enterprise Architecture terms SOA ...

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Flume: Gathering customer product search clicks data using Apache Flume

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This post covers to use Apache flume to gather customer product search clicks and store the information using hadoop and elasticsearch sinks. The data may consist of different product search events like filtering based on different facets, sorting information, pagination information and further the products viewed and some of the products marked as favorite by the customers. In later posts ...

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Continuous Delivery: Static Analysis

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This is the third article in the “Continuous Delivery” series. The CI Tools Setup ended with Jenkins up and running waiting for us to use it. Travis, on the other hand, was left aside and soon we’ll see why. In this article we’ll explore static analysis as the first type of tasks that we should do in our delivery pipeline. ...

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Java Singleton Design Pattern

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Its one of the simplest design pattern in Java. If any one asks me which design pattern you are good then I would proudly say Singleton. But when they ask in depth concept of singleton then I get stumped. Is it really singleton is that much difficult ? Really not but it has many scenarios that we need to understand ...

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Hello Cassandra

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A colleague recently told me about several benefits of Cassandra and I decided to try it out. Apache Cassandra is described in A Quick Introduction to Apache Cassandra as “one of today’s most popular NoSQL-databases.” The main page for Apache Cassandra states that the “Apache Cassandra database is the right choice when you need scalability and high availability without compromising ...

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The simple scalability equation

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Queueing Theory The queueing theory allows us to predict queue lengths and waiting times, which is of paramount importance for capacity planning. For an architect this is a very handy tool, since queues are not just the appanage of messaging systems. To avoid system over loading we use throttling. Whenever the number of incoming requests surpasses the available resources, we ...

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Declarative Linking in Jersey 2.9 and up

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A couple of weeks ago A couple of months ago I was looking how I was going to engineers new REST API for an Oracle Cloud project. Once of the things I had planned to do was to use the declarative link injection created in Jersey 1.x by Marc Hadley. Sadly this hadn’t been forwarded ported yet, so a quick ...

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Free as in Beer has caused Heartbleed (and Much More)

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Heartbleed is a bit over one month old now. A bug significant enough to have its own Wikipedia page. Today, we’re going to look into how wrong we have been in assuming that Open Source software is more secure than commercial software, because of our thinking that source code is open and that many developers are looking into it.   ...

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