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POWhere should my Business Logic go?
 

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  1. POWhere should my Business Logic go?
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    <p>I have the following seperation of logic in my application, as you can see I have a class called SimpleController which is what I use to Import and Find SimpleEntities. </p> <p>I read all the SimpleEntities into memory List cause I search these Entities very often and its a lot faster then reading from the database everytime I want to search for an Entity.</p> <p>Would it be better to move the logic where I read and store the SimpleEntities into memory into the SimpleLogic class instead of the SimpleController class?</p> <pre><code>public class SimpleEntity { public int SimpleId { get; set; } public string SimpleName { get; set; } } public class SimpleDAL { public ICollection&lt;SimpleEntity&gt; GetAllSimpleEntities() { //Retrieve SimpleEntities from Database } public void InsertSimpleEntity(SimpleEntity simpleEntity) { //Insert simple Entity into Database } } public class SimpleLogic { private readonly SimpleDAL simpleDAL = new SimpleDAL(); public ICollection&lt;SimpleEntity&gt; GetAllSimpleEntities() { return simpleDAL.GetAllSimpleEntities(); } public void InsertSimpleEntity(SimpleEntity simpleEntity) { //Validate simpleEntity before adding to database if (simpleEntity.SimpleId &lt;= 0) throw new Exception("Invalid SimpleEntity Id: " + simpleEntity.SimpleId); if (String.IsNullOrEmpty(simpleEntity.SimpleName)) throw new Exception("SimpleEntity Name cannot be empty or null"); simpleDAL.InsertSimpleEntity(simpleEntity); } } public class SimpleController { private readonly SimpleLogic simpleLogic = new SimpleLogic(); private List&lt;SimpleEntity&gt; simpleEntities; public SimpleController() { simpleEntities = simpleLogic.GetAllSimpleEntities().ToList(); } public int FindSimpleIndex(int simpleId) { return simpleEntities.FindIndex(p=&gt; p.SimpleId == simpleId); } public void ImportOtherSimpleEntity(OtherSimpleEntity otherSimpleEntity) { if (otherSimpleEntity.Operation == "Update") { int index = FindSimpleIndex(otherSimpleEntity.OtherSimpleId); //If entity was found update SimpleEntity if (index &gt; -1) { //Call SimpleLogic.UpdateSimpleEntity(Pass in SimpleEntity); } } } } </code></pre>
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