InfoQ Homepage Architecture & Design Content on InfoQ
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Presentation: Linda DeMichiel on EJB 3 & JPA
In this talk from last year's QCon London, Linda DeMichiel, who has been leading the EJB spec since the 1.0 days, presents EJB3 with a focus on JPA. The talk covers key aspects of the Java Persistence API and its role in the development of EJB 3.0 apps, including use of the EntityManager API, persistence units and persistence contexts, queries, object/relational mapping, etc.
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How-to Make your AJAX Applications Scream on the Client
AJAX is hot, no one will argue, but what is often the case is your Web 2.0 applications don't perform as well as you had hoped. Learn how a few simple optimizations can help.
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Consistency vs. availability: eventual consistency by Werner Vogels
Until the mid nineties, achieving distribution transparency and data consistency has often been the priority. As large Internet systems started to arise, availability became another important concern to be taken into consideration. Werner Vogels outlines some principles, abstractions and consistency/availability trade-offs related to large scale data replication with focus on eventual consistency.
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BPEL4People and WS-HumanTask Head To OASIS
John Evdemon, co-chair of the WS-BPEL technical committee, has announced that BPEL4People and WS-HumanTask are going to OASIS. Adding a standard approach to human interaction support to WS-BPEL is something many people have been asking for and this could be the solution.
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Engine Yard Takes $3.5 Million Series A From Benchmark Capital
Pioneering Ruby on Rails-hosting company Engine Yard has taken $3.5 million Series A in a round led by the prominent VC firm Benchmark Capital. Benchmark is responsible for early stage funding of some very successful startups such as eBay, Linden Labs, Yelp and Zillow. The move strikes confidence into the hearts of Ruby fans everywhere.
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File System Transactions - still a problem area?
Historically transaction-processing systems have relied primarily, if not solely, on databases to handle the ACID aspects of any IO activities that required to be transactional. The support for transactions for file system operations has been weak at either the libraries/frameworks, languages or file system levels. Lately, this situation is starting to show signs of improvement.
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InfoQ Interview: Jimmy Nilsson on LINQ to SQL
Floyd interviews Jimmy Nilsson on Microsoft's data access mechanism, LINQ to SQL.
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Component Composition Strategies and Tactics
With the advent of Spring and the development of the Dependency Injection pattern, Component Technologies have started providing advanced composition mechanisms. In the past month IBM and SAP published related articles exploring the modern strategies and tactics to develop composite business solutions.
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Presentation: Managing a high performance rails app without tearing your hair out
Rails has gained popularity for its clean implementation of MVC and slick APIs. But what happens when your Rails app grows up, gets popular but can't keep up with requests? This presentation by James Cox will get you started with optimizing web applications by giving practical tips and pointing out common bottlenecks.
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Injecting Implementation Dependencies into WCF Services
A very popular concept of implementing WCF services is to use a layered approach that consists of a service, a business logic and a data access layer. The dependencies between these layers might be injected at runtime via dependency injection containers.
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Robert Pickering on F# Workflows
In this second InfoQ exclusive article, Robert Pickering continues the conversation diving deep into how workflows work in F#. Workflows in F# provide the building blocks for library implementors to create DSLs.
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LINQ Grouping Techniques
For the most part LINQ works very much like SQL. Sources, joins, selects, and where clauses are all pretty standard fare. The Group/By/Into clause is where this breaks down. Unlike SQL, which always returns a rectangular dataset, LINQ is capable of returning hierarchical data. This brings new challenges of its own.
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Private Methods, Test Driven Development, and Good Design
The claim has been made that test driven development (TDD) encourages good design. The claim has also been made that TDD adversely affects design. Focusing on private methods and their relationships to good design and testability will give us something concrete to discuss - an instance of this apparent conflict.
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Interview: Patrick Smacchia discusses NDepend and Code Analysis
Patrick Smacchia, a Microsoft C# MVP, talks about his product NDepend and how it helps resolving issues in your code. Large code bases can be very complex to manage and the right tools make navigating so much easier.