Group items tagged

"Welcome to Scala Puzzlers, the collection of Traps, Pitfalls and Corner Cases in the Scala language. Prepare to be surprised, entertained and...well, puzzled! What is presented here is a selection of seemingly simple examples which demonstrate that there's plenty of head-scratching left in Scala. Let your mind be challenged by unexpected and unintuitive behaviour and results and learn something in the process. "

Breeze is a numerical processing library for Scala.

"Apache Hama is a pure BSP (Bulk Synchronous Parallel) computing framework on top of HDFS (Hadoop Distributed File System) for massive scientific computations such as matrix, graph and network algorithms. Today, many practical data processing applications require a more flexible programming abstraction model that is compatible to run on highly scalable and massive data systems (e.g., HDFS, HBase, etc). A message passing paradigm beyond Map-Reduce framework would increase its flexibility in its communication capability. Bulk Synchronous Parallel (BSP) model fills the bill appropriately. Some of its significant advantages over MapReduce and MPI are: * Supports message passing paradigm style of application development * Provides a flexible, simple, and easy-to-use small APIs * Enables to perform better than MPI for communication-intensive applications * Guarantees impossibility of deadlocks or collisions in the communication mechanisms"

"In this webinar, Suresh Attanayaka, senior software engineer at WSO2, will explain the importance of SSO for enterprise applications and how you can implement it by using WSO2 Identity Server. This session will also cover some common SSO patterns, various SSO technologies, and the process of selecting a technology based on a given scenario."

Hello everybody, I'm developing a custom authentication module. As part of the process I have to redirect the user to a second site and then the second site redirect the user back to the custom module. For this I'm using the RedirectCallback, but while debugging I noticed that the module gets initialized a second time after the users comes back from the second site. I was wondering if this is the expected behavior or if I'm doing something wrong. This is how the callbacks are defined in the xml.

"The Microsoft Build Engine is a platform for building applications. This engine, which is also known as MSBuild, provides an XML schema for a project file that controls how the build platform processes and builds software. Visual Studio uses MSBuild, but it doesn't depend on Visual Studio. By invoking msbuild.exe on your project or solution file, you can orchestrate and build products in environments where Visual Studio isn't installed."

"Reactive Streams is an initiative to provide a standard for asynchronous stream processing with non-blocking back pressure on the JVM."

"Baratine is a new distributed in-memory Java service platform for building high performance web services that combine both data and logic in the same JVM. Say again? In Baratine, the data lives within the service and the service owns its own data. This means: the data is not owned by the database the data is not modified by another process the data is not separate and distinct from the service => The data sits right in the service in the same JVM, the same thread, and the same class instance."

"Podio is an online work platform with a new take on how everyday work gets done. Podio gives people more power than ever before to manage their work in their own way and is trusted by thousands of teams, companies and organizations worldwide. Podio users create workspaces to collaborate with specific groups of people, use an Employee Network for company-wide communication across departments and locations, and get their work done using Podio Apps. Anyone can build their own Podio Apps without any technical skills, and can choose from hundreds of readily available, free apps in Podio's App Market. These apps add structure to any business process or project and are connected to social, collaborative activity streams used for commenting and discussion."

"Learning your way around a new software stack is challenging enough without having to spend multiple cycles on the install process. Instead, we have packaged such stacks into pre-built Oracle VM VirtualBox appliances that you can download, install, and experience as a single unit."

What is Graphite? Graphite is a highly scalable real-time graphing system. As a user, you write an application that collects numeric time-series data that you are interested in graphing, and send it to Graphite's processing backend, carbon, which stores the data in Graphite's specialized database. The data can then be visualized through graphite's web interfaces. Who should use Graphite? Graphite is actually a bit of a niche application. Specifically, it is designed to handle numeric time-series data. For example, Graphite would be good at graphing stock prices because they are numbers that change over time. However Graphite is a complex system, and if you only have a few hundred distinct things you want to graph (stocks prices in the S&P 500) then Graphite is probably overkill. But if you need to graph a lot of different things (like dozens of performance metrics from thousands of servers) and you don't necessarily know the names of those things in advance (who wants to maintain such huge configuration?) then Graphite is for you.

The ss command is used to show socket statistics. It can display stats for PACKET sockets, TCP sockets, UDP sockets, DCCP sockets, RAW sockets, Unix domain sockets, and much more. It allows showing information similar to netstat command. It can display more TCP and state information than other tools. It is a new, incredibly useful and faster (as compare to netstat) tool for tracking TCP connections and sockets. SS can provide information about: All TCP sockets. All UDP sockets. All established ssh / ftp / http / https connections. All local processes connected to X server. Filtering by state (such as connected, synchronized, SYN-RECV, SYN-SENT,TIME-WAIT), addresses and ports. All the tcp sockets in state FIN-WAIT-1 and much more. Most Linux distributions are shipped with ss and many monitoring tools. Being familiar with this tool helps enhance your understand of what's going on in the system sockets and helps you find the possible causes of a performance problem.

Grape is a realtime processing pipeline. Pull model.

"A typical Java EE application consists of an application server, such as WildFly, and a database, such as MySQL. In addition, you might have a separate front-end tier, say Apache, for load balancing a number of application server. A caching layer, such as Infinispan, may be used to improve overall application performance. Messaging system, such as ActiveMQ, may be used for processing queues. Both the caching and messaging components could be setup as a cluster for further scalability. This Tech Tip will show some simple Docker recipes to configure your containers that use application server and database. Subsequent blog will cover more advanced recipes that will include front-end, caching, messaging, and clustering. "

"CoreOS is a Linux distribution that has been rearchitected to provide features needed to run modern clustered infrastructure stacks. The strategies and architectures that influence CoreOS allow companies like Google, Facebook and Twitter to run their services at scale with high resilience. We've implemented them correctly so you don't have to endure the slow, learn-as-you-go infrastructure building process. CoreOS can run on your existing hardware or on most cloud providers. Clustering works across platforms, making it easy to migrate parts of your gear over to CoreOS, or to switch cloud providers while running CoreOS."

"Tsuru is an extensible and open source Platform as a Service software. Deploy Fast and secure. The entire process is really simple with no special tools needed, just a simple git push. Scale Scaling in Tsuru is completely painless. Just add a unit and Tsuru will take care of everything else. Extend Tsuru is built to be extensible. Through services you can provide anything your application needs."

big-data graph graph-processing architecture development programming

"Windsurf is a general framework for efficiently processing content-based image queries. With particular emphasis to the region-based paradigm, Windsurf provides an environment where different alternatives of the paradigm can be implemented. This allows such implementations to be compared on a fair basis, from the points of view of both effectiveness and efficiency."