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POconfiguring an existing application written in C++
 

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  1. POconfiguring an existing application written in C++
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    <p>First of all, this is a design question rather than an issue:</p> <p>I have an existing application written in C++.</p> <p>The structure is as following:</p> <pre><code>class Step1 { public: Step1(); void process(); void setValue(int v); // is to change the value private: int value; } class Step2 { public: Step2(); void process(); void setValue(int v); // is to change the value private: int value; } void main() { Step1 step1(); Step2 step2(); step1.setValue(1); step2.setValue(2); step1.process(); step2.process(); } </code></pre> <p>I am now allowed to change the current architecture but it is required to configure all of the steps from outside. I am proposing to create an xml file holding the configuration settings:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;Steps&gt; &lt;Step id="step1"&gt; &lt;param method="setValue" variable="v" value="1" /&gt; &lt;/Step&gt; &lt;Step id="step2"&gt; &lt;param method="setValue" variable="v" value="2" /&gt; &lt;/Step&gt; &lt;/Steps&gt; </code></pre> <p>And then I will add a class to parse the xml file:</p> <p>class XmlParser { public: XmlParser(); int parse(string xmlFile, string paramValue); }</p> <p>then I think I will change the main class only:</p> <pre><code>void main() { Step1 step1(); Step2 step2(); XmlParser xmlParser(); step1.setValue(xmlParser.parse(,)); step2.setValue(xmlParser.parse(,)); step1.process(); step2.process(); } </code></pre> <p>I have more than 20 steps and there are about 10 methods to be configured in every step. Is it a good idea to change the architecture in this way that the XmlParser class will parse the xml file and pass the values to the set methods of the steps. Or is there a better way to do this? </p> <p>I would like to know your opinions.</p> <p>Thanks in advance.</p>
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    1. COThe xml makes your code more configurable in the sense that the data resides separate from the code,However it adds a little overhead of parsing the xml.So it depends what is your primary aim for modification of the design.
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    2. COMy aim is to make the application configurable from the outside. Therefore, I introduced the xml to hold the configuration settings and add the xmlParser class. Yes, I agree with you that the parse() method of the xmlParser will be very over complicated and not easy to read. What would you suggest? thanks in advance.
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    3. COIf the aim is to make your application externally configurable then using the xml is a good idea, Encapsulating the xml parsing in a separate class is a good idea as well, I may also suggest using some good open source xml parsing library for ease of usage and coding.You have the right approach, All the best.
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