StackOverflow2013

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POImplementing repositories using NHibernate and Spring.Net
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copied!<p>I'm trying to get to grips with NHibernate, Fluent NHibernate and Spring.</p> <p>Following domain-driven design principals, I'm writing a standard tiered web application composed of:</p> <ul> <li>a presentation tier (ASP.Net)</li> <li>a business tier, comprising: <ul> <li>an application tier (basically a set of methods made visible to UI tier)</li> <li>repository interfaces and domain components (used by the application tier)</li> </ul></li> <li>A persistence tier (basically the implementation of the repository interfaces defined in the business tier)</li> </ul> <p>I would like help determining a way of instantiating an NHibernate ISession in such a way that it can be shared by multiple repositories over the lifetime of a single request to the business tier. Specifically, I would like to:</p> <ul> <li><p>allow the ISession instance and any transaction to be controlled outwith the repository implementation (perhaps by some aspect of the IOC framework, an interceptor?)</p></li> <li><p>allow the ISession instance to be available to the repositories in a test-friendly manner (perhaps via injection or trough some shared 'context' abstraction)</p></li> <li><p>avoid any unnecessary transactions being created (i.e. when only read-only operations have been executed)</p></li> <li><p>allow me to write tests that use SQLLite</p></li> <li><p>allow me to use Fluent NHibernate</p></li> <li><p>allow the repository implementation to remain ignorant of the host environment. I don't yet know if the businese tier will run in-process with the presentation tier or will be hosted separately under WCF (in IIS), so I don't want to bind my code too closely to a HTTP context (for example).</p></li> </ul> <p>My first attempt to solve this problem had been using the Registry pattern; storing the ISession instance in a ThreadStatic property. However, subsequent reading has suggested that isn't the best solution (as ASP.Net can switch the thread within the page lifecycle, I believe).</p> <p>Any thoughts, part solutions, pattern names, pointers to up-to-date samples (NHibernate 2) will be most gratefully received.</p>

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