Hibernate collections optimistic locking

Introduction Hibernate provides an optimistic locking mechanism to prevent lost updates even for long-conversations. In conjunction with an entity storage,…

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Hibernate application-level repeatable reads

Introduction In my previous post I described how application-level transactions offer a suitable concurrency control mechanism for long conversations. All…

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MongoDB Incremental Migration Scripts

Introduction An incremental software development process requires an incremental database migration strategy. I remember working on an enterprise application where…

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Integration testing done right with Embedded MongoDB

Introduction Unit testing requires isolating individual components from their dependencies. Dependencies are replaced with mocks, which simulate certain use cases.…

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Logical vs physical clock optimistic locking

Introduction In my previous post I demonstrated why optimistic locking is the only viable solution for application-level transactions. Optimistic locking…

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The fastest way of drawing UML class diagrams

A picture is worth a thousand words Understanding a software design proposal is so much easier once you can actually…

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Preventing lost updates in long conversations

Introduction All database statements are executed within the context of a physical transaction, even when we don’t explicitly declare transaction…

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A beginner’s guide to database locking and the lost update phenomena

Introduction A database is highly concurrent system. There’s always a chance of update conflicts, like when two concurring transactions try…

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Hibernate bytecode enhancement

Introduction Now that you know the basics of Hibernate dirty checking, we can dig into enhanced dirty checking mechanisms. While…

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