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POInterface Split between Two Classes
 

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    <p>I find myself wishing an interface could be composed of methods that are fulfilled in several classes. If I could do that, I could make an interface for a role that has one function from this class and one function from that class.</p> <p>Does any language support this? Is it possible in the typical Java/C#/VB.NET style OO?</p> <p>For example: I have a function that takes an value object, and saves all the parts into the correct tables. I just made an interface called <code>StatsPersistence</code> that I inject to a function so I can unit test its behavior, but it is missing a method. I want to be able add a method to that, but that method is on a different class from the first two, so this is obviously not possible. So, I have 2 methods in one class and 1 are in the other, but they both are needed for the "role" of "StatsPersistence". Also, those methods are all three needed for other roles too, not just this one.</p> <p>What I have:</p> <pre><code>interface StatsPersistence public saveSession(session) // fulfilled in much larger StatsActiveRecord public saveAppUse(appUse) // fulfilled in much larger StatsActiveRecord </code></pre> <p>What I want:</p> <pre><code>interface StatsPersistence public saveSession(session) // fulfilled in much larger StatsActiveRecord public saveAppUse(appUse) // fulfilled in much larger StatsActiveRecord public updateUnit(name) // fulfilled in much larger UnitActiveRecord </code></pre> <p>I <em>could</em> just make a new class that wraps all three methods, and have that class just make calls to the two implementers, but that seems just like a lot of OOverkill.</p> <p>My thoughts are leaning towards:</p> <ul> <li>My interface role is too broad</li> <li>Make a class that wraps these three, and have it implement my desired interface</li> </ul>
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    1. UShvgotcodes
    1. USSteve
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    1. COFacade Pattern perhaps?
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      1. USTerry Wilcox
    2. CO"Interface is Contract that class must fulfill" AND NOT "Classes are contract that interface must be applied on".
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      1. USDhananjay
    3. CO@Dhananjay I knew that, I was just hoping perhaps there was an "unknown unknown" lurking outside my understanding of interfaces and classes and how they could be composed. Perhaps some new use of traits, or a functional programming technique I am not aware of.
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      1. USSteve
 

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