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POWhat design pattern is best employed to control a sequence of steps?
 

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  1. POWhat design pattern is best employed to control a sequence of steps?
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    <p>I have a winform tool that interfaces with hardware using a serial port.</p> <p>The serial port is used to send commands to the the hardware, which will acknowledge the commands and sometimes return data.</p> <p>To accomplish a task, several commands need to be sent to the hardware in a defined order.</p> <p>I have successfully implemented the tool using a switch statement to control the sending of the commands. However, while this works, I can't help thinking that there is a better, more OO way of doing this - is there?</p> <p>Current implementation is below:</p> <p>Each case is a command that needs sending to the hardware. Send method is passed a method to invoke and the ID of next step - which will be returned if command sent successfully.</p> <ul> <li>Tool will send a start session command to the hardware. </li> <li>Hardware acknowledges command.</li> <li>Tool sends a set direction command to the hardware. </li> <li>Hardware will acknowledge command.</li> </ul> <p>etc.</p> <pre><code>MessageID nextStep = MessageID.IMS; while (nextStep != MessageID.Stop) { switch (nextStep) { case MessageID.ISS: nextStep = Send( new ISS_StartSession(), MessageID.IE386); RaiseProgressEvent(10); //percentage complete break; case MessageID.IE386: nextStep = Send( new IE386_SetDirection(Direction.BOTH), MessageID.IE378); RaiseProgressEvent(20); break; //etc case MessageID.Error: HandleError(); //abort task if necessary break; } } </code></pre> <p>Is there a better way to do this..?</p> <p>Is there a well known design pattern I should look at?</p>
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      1. USJavier Ferrero
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      1. USAustin Salonen
 

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