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POWhat Design Pattern Should I use to accomplish the task below
 

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    <p>I need to be able to conditionally execute a method. I prefer not having a bunch of IF statements throughout my code for several reasons, the most notable is that at a certain point in the future the method will no longer be used.</p> <p>I am not sure of the best way to do this or what pattern(s) I should choose to accomplish this task.</p> <p>The application I refer to is an application that is going to replace a legacy system. The legacy code will be turned off and no longer used at some point. Once that point of time comes, I don't want to have to go back and change any code (if at all possible).</p> <p>The following is a fictious conceptual example in psuedo of what I mean:</p> <pre><code>NewSystemEmployee.Save(Employee e) if (Legacy System Is Running) { LegacySystemEmployee.Save(Employee e) } </code></pre> <p>The method <code>NewSystemEmployee.Save</code> always needs to execute. I only want to execute <code>LegacySystemEmployee.Save</code> as long as the Legacy system is running. Once the Legacy system is shutdown, I no longer want to execute <code>LegacySystemEmployee.Save</code></p> <p>Once the legacy system goes away, I don't know how I can accomplish what I want without:</p> <ol> <li>Creating an IF statement before I call <code>LegacySystemEmployee.Save</code> OR</li> <li>Removing every call to <code>LegacySystemEmployee.Save</code> method OR</li> <li>Changing <code>LegacySystemEmployee.Save</code> method so that it is a stub and nothing more</li> </ol> <p>I also have a requirement that the <code>NewSystemEmployee</code> class does not refer in any way to the <code>LegacySystemEmployee</code> class.</p> <p>Any suggestions?</p> <p>Thanks so much </p>
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