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    <p><a href="http://martinfowler.com/eaaCatalog/serviceLayer.html" rel="noreferrer">Service layer</a> advocacy is relatively new and still subject to a variety of interpretations. I think it means having a layer that leverages multiple domain models which the controllers call (I may be simplifying it too much though). I recently developed a website making use of this and practical advantages I've encountered are:</p> <ol> <li><p>Features as a service helps with scalability. If you have an image service that initially uses the local service to do it's work it becomes easier to have that service point to another server or some 3rd party without having to make sweeping updates</p></li> <li><p>Flexibility. Half way through the project I decided to change a core piece of functionality and was able to do so painlessly; allowing me to quickly weigh the pros and cons of the update. This flexibility is useful when rapid prototyping and instills a certain confidence because if you need to revisit something it's not going to be a nightmare. </p></li> <li><p>Extensibility. I have already identified services in my application what I can forsee opening to other developers or other widgets, mobile apps in the future. Doing so in theory is just a matter of adding authentication and authorization to the service (because the features are already in it's own layer and I don't have to spend time trying to decouple what I want to expose from the rest of the code base).</p></li> <li><p>Services are easy to add and drop (maybe this belongs with one of the earlier points). I have services that a specific to a specific stage in the project (e.g. invite only stage) that I can drop once that phase is over.</p></li> </ol> <p>I think it has practical advantages and a key to success in implementation is having a good way to manage the services in the application. I use symfony's <a href="http://components.symfony-project.org/dependency-injection/" rel="noreferrer">dependency injection component</a></p>
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    1. POIs MVC + Service Layer common in zend or PHP?
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    1. CORe #2, can you give a concrete example of how you changed that piece of functionality (the before and after) just so it's easier to understand how a service layer works in practical terms? In #3, you sound like you're talking about an API and #4 sounds like a permission system. I'm still trying to get what this service layer is about and the right way to use it, so maybe that's why I'm falling back on those more known concepts.
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    2. CO2. I switched from using solr to mysql and back with no great impact on my models or controllers. (as a matter of fact I'm waiting for doctrine for doctrine's mongodb implementation to mature a bit before I give that a go and this is why I mentioned that it helps build confidence.
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    3. CO3. I am talking about making some of my services available to the 3rd party devs or even my own mobile apps or other ways to consume the content.
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