Displaying 20 to 40 from 104 results

Introduction to Apache Cassandra

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Apache Cassandra was designed by Facebook and was open-sourced in July 2008. It is regarded as perfect choice when the users demand scalability and high availability without any impact towards performance. Apache Cassandra is highly scalable, high-performance distributed database designed to handle large voluminous amounts of data across many commodity servers with no failure.

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Holistic usage guide for OpenSSL

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OpenSSL is a general purpose cryptographty toolkit that provides an open source implementation of Transport Layer Security(TLS) and Secure Socket Layer(SSL) protocols. It is written in C,assembly and Perl language but wrappers are available in all languages. This article explains about OpenSSL commands.

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Quick Start Programming Guide for redis using java client Jedis

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Redis is an open source (BSD licensed), in-memory data structure store, used also as a database cache and message broker. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs, geospatial indexes with radius queries and streams. This article explains about how to communicate with Redis using Java client Jedis.

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PySpark: Installation, RDDs, MLib, Broadcast and Accumulator

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We knew that Apace Spark- the most famous parallel computing model or processing the massive data set is written in Scala programming language. The Apace foundation offered a tool to support the Python in Spark which was named PySpark. The PySpark allows us to use RDDs in Python programming language through a library called Py4j. This article provides basic introduction about PySpark, RDD, MLib, Broadcase and Accumulator.

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Connect to MongoDB and Perform CRUD using Java

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MongoDB is a popular and widely used open source NoSQL database. MongoDB is a distributed database at its core, so high availability, horizontal scaling, and geographic distribution is quite possible. It is licensed under Server Side Public License. Recently they moved to Server Side Public License, before that MongoDB was released under AGPL. This article will provide basic example to connect and work with MongoDB using Java.

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Read and Write PDF using OpenPDF

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OpenPDF is based on a fork of iText version 4. iText is a widely used PDF library but they changed their license and moved to AGPL. In this article, we can see how to read and write to PDF, How to extract text from PDF and How to create password protected PDF.

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mkcert - No config certificate authority tool

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Mkcert is go-lang project, which is super easy tool to setup certificate authority without any configuration. Using certificates are inevitable these days, data should be transferred in a secure communication channel. Buying a certificate is expensive and mostly companies buy certificates only for production systems. In Dev setup, if we use self-signed certificate then there will be trust errors. mkcert automatically creates and installs a local CA in the system root store, and generates locally-trusted certificates.

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Top 3 color quantization algorithms

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I have been writing on the desktop image processing application. At the version 1.0, I use the octree color quantization algorithm to reduce image to 256 colors, which is highly memory efficient with each pixel assigned the color at the center of the octree bin in which it falls. On the other hand, generates the palette using the distribution of colors in the image, but it does not consider the frequency of color. This means that if an image is composed of similar colors overall but has many different low-frequency colors or noise, octree's results can be very poor.

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Compress files faster using Snappy

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Snappy is the fast compression/decompression library from Google. It does not target to reduce compression size but it does faster compression. Most of the open source products use Snappy.

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MailHog - Web and API based SMTP testing

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Most of the projects will have a requirement of sending and receiving mails. We have mentioned about GreenMail - Email Test Framework, in our previous article about API based SMTP testing. In this article, we discuss about MailHog - Web and API based SMTP testing. You send out a mail from your code and you can check it via web visually and also via API. Those who do API testing can check via API. Developers may want to visually verify the format of the mail. MailHog is a best bet for SMTP testing.

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JWT Authentication using Auth0 Library

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Json Web Token shortly called as JWT becomes defacto standard for authenticating REST API. In a traditional web application, once the user login credentials are validated, loggedin user object will be stored in session. Till user logs out, session will remain and user can work on the web application without any issues. Rest world is stateless, it is difficult to identify whether the user is already authenticated. One way is to use authenticate every API but that would be too expensive task as the client has to provide credentials in every API. Another approach is to use token.

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Generate Thumbnail in Java using Thumbnailator library 

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In our work there will be situation where we need to resize the image, generate thumbnails and so on. Users need to have little bit of image processing knowledge to achieve it. We have Java ImageIO APIs to achieve these functionalities. As said, we need to be aware of or spend time in learning these APIs. To help us, Thumbnailator library provides easy fluent style API and generates thumbnail in simple three lines of code.

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GreenMail - Email Test Framework in Java

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In any project there will be a need to send mail out to users. It could be an alert mail, forget password or authentication related mail. Mail is the default communication between the software and the users. As a developer, we can write code, to send out a mail but we need to make sure whether it got successfully received and how the body of mail, Is it the same like what we have sent. GreenMail is a Email test framework which helps to send and receive mails. It is a test framework which supports SMTP, POP3, IMAP including SSL.

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Activiti - Open Source Business Automation

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Activiti Cloud is the first Cloud Native BPM framework built to provide a scalable and transparent solution for BPM implementations in cloud environments. The BPM discipline was created to provide a better understanding of how organisations do their work and how this work can be improved in an iterative fashion.

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Enhancing The Experience With Android TV: Briefly About One Developer's Impressions

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In my software development career, I have always been attracted to new technologies and innovative solutions. Project by project, I have been exploring something new, discovering and implementing different approaches and trying new solutions. When Android TV showed up, I set a new personal goal. I described my impressions and the overall opinion on the application development for Android TV right here. Hope you will find it useful and interesting.

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Microsoft acquires GitHub. Is it Good or Bad?

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Microsoft announced that it is acquiring GitHub for 7.5 Billion dollars. GitHub is a most used Software developer and Code hosting platform. It hosts more than 80 million code repository and more than 20 million developers collaborate in GitHub. In addition to managing code repositories, GitHub has developed many tools to increase the productivity of developers. Almost 70% of open source projects hosted in GitHub. Microsoft is a big corporate leader and it buying a open source code hosting company, Is it good or bad?

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Ngnix - High Performance Web Server, Proxy Server, Content Cache and Reverse Proxy

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Nginx is a High Performance Web Server, Proxy Server, Content Cache and Reverse Proxy server. It can also be used as mail proxy server and a generic TCP/UDP proxy server. Nginx claims to be more efficient and faster in the Web space compared to the other web servers. This can be evident with the architecture which is based on asynchronous event-driven approach. The event driven architecture enables to scale to hundreds / thousands of concurrent connections.

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ONLYOFFICE Document Server, an online office app for Nextcloud and ownCloud

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ONLYOFFICE Document Server is a free collaborative online office suite including viewers and editors for texts, spreadsheets and presentations, fully compatible with Office Open XML formats (.docx, .xlsx, .pptx). This article provides you the overview of ONLYOFFICE Document Server, its features, installation and integration with Nextcloud and ownCloud.

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Exonum Blockchain Framework by the Bitfury Group

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Exonum is an extensible open source blockchain framework for building private blockchains which offers outstanding performance, data security, as well as fault tolerance. The framework does not include any business logic, instead, you can develop and add the services that meet your specific needs. Exonum can be used to build various solutions from a document registry to a DevOps facilitation system.

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Europe Copyright reform may affect Open Source Ecosystem

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Europe is planning to bring in new copyright law, which would require code sharing sites to monitor copyright content to avoid potential copyright infringement. The proposed Article 13 of the EU Copyright Directive targets every online service that allows its users to upload and share content with each other, including code hosting platforms.

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