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Make it easier to add new code When we add a new feature to a system, we have a choice: we can quickly program the feature without regard to how well it fits with an existing design, or we can modify the existing design so it can easily and gracefully accommodate the new feature If we go with the former approach, we incur design debt (see Design Debt, 15), which can be paid down later by refactoring If we go with the latter approach, we analyze what will need to change to best accommodate the new feature and then make whatever changes are necessary Neither approach is better than the other If you have little time, it may make more sense to quickly add the feature and refactor later If you have more time or you perceive that you'll go faster by paving the way for the feature prior to programming it, by all means refactor before adding the feature Improve the design of existing code By continuously improving the design of code, we make it easier and easier to work with This is in sharp contrast to what typically happens: little refactoring and a great deal of attention paid to expediently adding new features Continuous refactoring involves constantly sniffing for coding smells (see 4, 37) and removing smells immediately after (or soon after) finding them If you get into the hygienic habit of refactoring continuously, you'll find that it is easier to extend and maintain code You may even enjoy your job more Gain a better understanding of code Sometimes we look at code and have no idea what it does or how it works Even if someone could stand next to us and explain the code, the next person to look at it could also be totally confused Is it best to write a comment for such code No If the code isn't clear, it's an odor that needs to be removed by refactoring, not by deodorizing the code with a comment When we refactor such code, it is usually best to do so in the presence of someone who fully understands the code If that person isn't available, see if he or she can help explain the code by e-mail, chat, or phone Failing that, refactor only what you truly understand In the end, your efforts will make it easier for everyone to understand the code Make coding less annoying I've often wondered what propels me to refactor code Sure, I can say that I refactor to remove duplication, to simplify or clarify the code But what actually propels me to refactor Emotions I often refactor simply to make code less annoying to work with For example, I once joined a project that had some significant design debt In particular, there was one enormous class with way too many responsibilities Because much of what we did involved changing this enormous class, every time we checked in code (which was often, since we practiced continuous integration), we would have to deal with a complex merge involving the enormous class As a result, everyone took longer than necessary to integrate code This was very annoying So another programmer and I set off on a three-week odyssey to break apart the enormous class into smaller classes It was hard work that just had to be done When we finished this work, integrating code took far less time and the overall programming experience was much more pleasant.

<!-- this is the serialized DataSet --> <xsd:schema id="NewDataSet" targetNamespace="http://wwwLearnXmlWScom/customerorders/ds" xmlns="http://wwwLearnXmlWScom/customerorders/ds" xmlns:xsd="http://wwww3org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" attributeFormDefault="qualified" elementFormDefault="qualified"> <xsd:element name="NewDataSet" msdata:IsDataSet="true"> <!-- type definition removed --> </xsd:element> </xsd:schema> <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <NewDataSet xmlns="http://wwwLearnXmlWScom/customerorders/ds"> <Customers diffgr:id="Customers1" msdata:rowOrder="0"> <CustomerID>ALFKI</CustomerID> <CompanyName>Alfreds Futterkiste</CompanyName> </Customers> <!-- data removed --> </NewDataSet> </diffgr:diffgram> </GetCustomersDataSetResult> </GetCustomersDataSetResponse> </soap:Body> </soap:Envelope>

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Defaultaspxcs" Inherits="PartialPostBackWeb_Default" %> <%@ Register assembly="ImageRotatorExtender" namespace="ImageRotatorExtender" tagprefix="cc1" %> <html> <head runat="server"> <title>Image Rotator Update Panel Example</title> </head> <body> <form id="form1" runat="server"> <h2>Pictures of Florence provided by <asp:Image ID="Image2" runat="server" ImageUrl="~/images/freeDigitalPhotoslogogif" /> </h2> <h3> Page Last Updated: <asp:Label ID="Label1" runat="server" Text="Label" /> </h3> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> <ContentTemplate> <h4>Update Panel Last Updated <%=DateTimeNow %> </h4> <asp:Image ID="Image1" runat="server" ImageUrl="~/images/1jpg" />

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The response message in listing 9-2 contains the serialized DataSet beginning with the <xsd:schema>

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Move Embellishment to Decorator (144) and Replace Conditional Logic with Strategy (129) are competing refactorings Both can eliminate conditional logic associated with special-case or alternative behavior, and both do so by moving such behavior out of an existing class and into one or more new classes Yet how these new classes are used is the difference Decorator instances wrap themselves around an object (or each other), while one or more Strategy instances are used within an object, as shown in the following diagram

<cc1:ImageRotator ID="Image1_ImageRotator" runat="server" ImageList="images/2jpg, images/3jpg, images/4jpg, images/1jpg" TargetControlID="Image1" /> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" /> </Triggers> </asp:UpdatePanel> <div> <asp:Button ID="Button1" runat="server" Text="Post Back Update Panel" /> </div> <div> <asp:Button ID="Button2" runat="server" Text="Post Back Page" /> </div> <p> <a href="http://wwwfreedigitalphotosnet">Royalty free stock Photography</a> for websites, PowerPoint, newletters, forums, blogs, schools and homework - FreeDigitalPhotos net </p> </div> </form> </body> </html>

When does it make sense to refactor to Decorator versus to Strategy There's no simple answer You must consider numerous issues when making the decision Here are a few

element By default, a serialized DataSet contains first an XSD schema then a DiffGram containing the data If you take a look at the service s WSDL document you ll see that the type definitions reflect this as shown in listing 9-3

When we cause the UpdatePanel to refresh multiple times by clicking Button1 (Postback Update Panel), we start to get some interesting results Figure 79 shows the odd-looking image that we get after we ve caused the UpdatePanel to refresh a few times We see this odd-looking image because whenever an instance of the ImageRotator is created, which occurs every time we cause the UpdatePanel to refresh, a new interval is attached to the window Listing 710 highlights the code that creates the interval

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_setupRotation: function(){ var expression = Stringformat("$get('{0}') ImageRotator_rotateImage()", thisget_element()id); windowsetInterval(expression,thisget_rotationInterval()*1000); }

Listing 9-3 WSDL defining the response message for the method shown in listing 9-1

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