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copied!<p>Having a singleton at all may be a wrong move. There are times that a singleton is appropriate, but there's usually a better choice.</p> <p>It sounds like you may already be implementing something resembling the <a href="http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller" rel="nofollow">Model-View-Controller</a> pattern, which would be appropriate. In this context, this array of measurements is part of your model, and it may make sense for it to be a separate class, but there's likely no need for it to be a singleton.</p> <p>The name <code>MeasurementsArray</code> is implementation-specific. I would be more inclined to call it just <code>Measurements</code> or to give it a name reflecting what the measurements are measuring.</p> <p>In fact I wonder about the name of your <code>Measurement</code> class. What is it measuring? What does it actually represent? </p> <p>If you post some code, we might be able to provide more specific ideas. </p> <p>Based on your update and a bit of thinking, you might want to think about <a href="http://martinfowler.com/eaaCatalog/repository.html" rel="nofollow">The Repository Pattern</a>. Rather than having your controllers hold the array, they have access to the repository from which they can get it.</p> <p>My thinking here is that your array of measurements might be supplied by a <code>MeasurementRepository</code> and that while now the data might be a single simple array that the repository just holds, it might evolve to something that is stored in a database per user and with variation over time, so that your repository supplies more complex access.</p> <p>Rather than having this repository be a singleton (though that is certainly sometimes done), it might better be just created once and then injected into everything that needs it. See <a href="http://en.wikipedia.org/wiki/Dependency_injection" rel="nofollow">http://en.wikipedia.org/wiki/Dependency_injection</a> and <a href="http://butunclebob.com/ArticleS.UncleBob.SingletonVsJustCreateOne" rel="nofollow">Uncle Bob's blog</a></p>

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