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Simple vs. Easy: Writing A Generic Code To Avoid Duplication (Representation of Data To Import)

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In our batch jobs for data import we had many similar classes for holding the data being imported. Technically they are all different, with different fields, yet conceptually they are all same. I find this conceptual duplication discomforting and have written a single, more generic, class to replace them all. The refactoring has been inspired by Clojure and its preference ...

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Aggregating async results using Spring Integration

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Hi, I came across an issue which has very nice solution using Spring Integration. Many times we have the need for a scenario of dispatching a message to unknown number of destinations. For this purpose we have the Topic methodology. But some times in addition we also want to receive answers from all destinations which received the message and aggregate ...

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Estimating Might Be Broken, But It’s Not Evil

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Ron Jeffries’s essay Estimation is Evil talks about how absurd estimating can be on a software project, and the nightmare scenarios that teams can end up in: …Then we demand that the developers “estimate” when they’ll be done with all this stuff. They, too, know less about this product than they ever will again, and they don’t understand most of ...

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Multilayered Architecture (4) – The Infrastructure Layer

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Introduction What is Infrastructure? If we think at a building, Infrastructure is what brings light and water. You can build a wonderful house, but if you don’t connect it to the city infrastructures, you will never be able to live in it. Finally this building is able to receive water and light, but is not linked to any specific water ...

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Testing Spring “session” scope

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In a Spring based Web application, beans can be scoped to the user “session”. This essentially means that state changes to the session scoped bean are only visible in the scope of the user session. The purpose of this entry is to simply highlight a way provided by Spring Test MVC to test components which have session scoped beans as ...

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Spring Data Solr Tutorial: Pagination

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In the earlier parts of my Spring Data Solr tutorial, we have implemented a simple search function which is used to search the information of todo entries. The current implementation of our search function shows all search results in a single page. This is not a viable solution for most real life applications because the number of search results can ...

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Continuous Delivery – Part 6 – Backward & Forward Compatibility

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Previous Chapter: Startup – Self Test One very important mind set developers will have to adopt and practice is backward and forward compatibility. Most production system do not consist on just one server, but a cluster of servers. When deploying new piece of code, you do not deploy it to all the servers at once because part of Continuous deployment ...

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Code Reviews with Five Whys

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We are told that we should organize code reviews because code reviews good for our code base. We have followed this advice and managed to build a magnificent facade. We are doing code reviews and improving our code base. Everything is looking great from the outside and it might be true that we are making some progress. However, we are ...

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