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    <p>They are both examples of the <em>factory method</em> pattern. The only difference is that the second example has the method in its own static class. </p> <p>This would be an example of the <em>abstract factory</em> pattern:</p> <pre><code>abstract class MessageProcessorFactory { public abstract MessageProcessor GetProcessor (Message message, DataDomain data); } class FooMessageProcessorFactory : MessageProcessorFactory { public override MessageProcessor GetProcessor (Message message, DataDomain data) { return new FooMessageProcessor(data.Name, data.Classification); } } </code></pre> <p>Each MessageProcessor gets its own factory class which makes use of polymorphism.</p> <p>Passing a ProcessBuilder to create the process would be the <em>strategy</em> pattern:</p> <pre><code>class MessageProcessor { ProcessBuilder builder; public MessageProcessor(ProcessBuilder builder) { this.builder = builder; } public void Process() { builder.BuildMessage(); builder.BuildProcess(); builder.Process(); } } var mp = new MessageProcessor(new FooProcessBuilder()); </code></pre> <p>The simplest solution would be to encapsulate a factory method:</p> <pre><code>static void Process(Message msg, DataDomain data) { var p = getProcessor(msg.GetType()); p.Process(msg, data); } </code></pre> <p>If it's a small known number of types, you can use the series of type checks:</p> <pre><code>private static MessageProcessor getProcessor(Type msgType) { return (msgType == typeof(FooMessage)) ? new FooMessageProcessor() : (msgType == typeof(BarMessage)) ? new BarMessageProcessor() : new DefaultMessageProcessor(); } </code></pre> <p>Otherwise use a dictionary:</p> <pre><code>Dictionary&lt;Type,MessageProcessor&gt; processors; private static MessageProcessor getProcessor(Type msgType) { return processors[msgType]; } </code></pre>
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    1. POWhat are the differences between the Builder, Factory Method, and Abstract Factory patterns?
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    1. COI would do something like that, but I just used the DataDomain object as an example.In our application, there is no type that encapsulates all the input values, and in some cases it would mean passing a parameter to a method that doesn't need it.
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    2. COFor this example, you'd have to consider the trade-off between a complex design for accounting for different input parameters and a simpler design that may result in unused method arguments. If the variation isn't fixed or small, then go with a more complex design or punt and use a generic object
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    3. COWorse Indentation Style Ever! :)
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