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POHow to set up an in-memory repository
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  1. POHow to set up an in-memory repository
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    copied!<p>I have the following class:</p> <pre><code>public class InMemoryRepository : IRepository { public void Add(object entity) { throw new NotImplementedException(); } public void Attach(object Entity) { throw new NotImplementedException(); } public T Get&lt;T&gt;(object id) { throw new NotImplementedException(); } public IList&lt;T&gt; GetAll&lt;T&gt;(string queryName) { throw new NotImplementedException(); } public IList&lt;T&gt; GetAll&lt;T&gt;() { throw new NotImplementedException(); } public IQueryable&lt;T&gt; Query&lt;T&gt;() { throw new NotImplementedException(); } public void Remove(object entity) { throw new NotImplementedException(); } public void Save(object entity) { throw new NotImplementedException(); } } </code></pre> <p>Our default repository implementation uses NHibernate for the backing store, but I'd like to implement an in-memory version of it so I can prototype the domain objects without having to create a backing SQL database. Assuming the convention that all objects have an Id property as the primary key, how would you implement a generic memory store for this?</p> <p>Some key points I'm having a hard time addressing:</p> <ul> <li>The repository methods themselves are generic, so I need some mechanism for automatically storing and referencing different types. <code>Get&lt;TestEntity&gt;(object id)</code> should be able to query all stored instances of TestEntity and find the one with the matching Id property, but I can't define a collection of TestEntity objects directly, as the repository won't know what types I'm feeding it until runtime.</li> <li>I need to support LINQ to Objects for the Query() method. Assuming I can come up with a decent way to store the objects, this should be as simple as returning an array of stored objects AsQueryable().</li> </ul> <p>How would you store the objects to meet the above requirements?</p>
 

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