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The small patterns that we ve looked at so far can usefully be applied to specific coding tasks. Patterns have also been developed for the organization of entire applications, sometimes referred to as architectural patterns. In this section, we re going to look at an architectural pattern that can help us to organize our Ajax projects in several ways, making them easier to code and easier to maintain. Model-View-Controller (MVC) is a way of describing a good separation between the part of a program that interacts with a user and the part that does the heavy lifting, number crunching, or other business end of the application. MVC is typically applied at a large scale, covering entire layers of an application or even stretching between the layers. In this chapter, we introduce the pattern and show how to apply it to the web server when serving data to an Ajax application. In chapter 4, we ll look at the rather more involved case of applying it to the JavaScript client application. The MVC pattern identifies three roles that a component in the system can fulfill. The Model is the representation of the application s problem domain, the thing that it is there to work with. A word processor would model a document; a mapping application would model points on a grid, contour lines, and so on. The View is the part of the program that presents things to the user input forms, pictures, text, or widgets. The View need not be graphical. In a voicedriven program, for example, the spoken prompts are the View. The golden rule of MVC is that the View and the Model shouldn t talk to each other. Taken at face value, that might sound like a pretty dysfunctional program, but this is where the Controller comes in. When the user presses a button or fills in a form, the View tells the Controller. The Controller then manipulates the Model and decides whether the changes in the Model require an update of the View. If so, it tells the View how to change itself (see figure 3.5). The advantage of this is that the Model and View remain loosely coupled, that is, neither has a deep understanding of the other. Obviously they need to
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Creating a Castle Windsor controller factory
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Creates the Logger object
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$im->Draw(primitive => 'line', stroke => 'green', points => '12,34 23,45');
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A touching example: the event reporter
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See the discussion on page 242 for more information. This method is also available as read() or readimage().
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public DirectoryProvider< >[] getDirectoryProvidersForDeletion( Class< > entity, Serializable id, String idInString) { return providers; Providers where the }
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Classes Versus Objects
API server, coarse-grained 271 server, fine-grained 270 security in 271 appendChild() 50 application desk top 5 secure login 267 transient vs sovereign 15 application framework 111 Backbase for widgets 113 Echo2 for UI components 113 Ruby on Rails for web page development 114 SAJAX for remote procedure calls 112 server side 111 applyButtonBehaviors() in RSSReader object 548 architectural patterns 91 architecture MVC 123 n-tier 7, 162 Ajax as a tier 162 early 2-tier 162 web application 162 server-side 164 architecture, n-tier 162 Ajax view 7 arguments pseudo array 349 arguments, property 607 Array asignment by keyword 594 assignment by index 594 Array class extending methods of 599 instantiation 593 arrow keys event handler 379, 409 moving highlight 388 preventing default behavior 410 ASP 161 asynchronous communication ActiveX objects 58 and HTTP protocol 14 benefits 27 callback function 61 detecting completion 351 example of 62 IFrame 54 Microsoft.XMLHTTP 58 onload property 61 onreadystatechange property 61
set_option() method:
>%MIDPTools%\preverify -classpath %MIDPClasses%;. ObtainQuoteMIDlet >%MIDPTools%\preverify -classpath %MIDPClasses%;. RetrieveQuoteMIDlet >%MIDPTools%\preverify -classpath %MIDPClasses%;. EntryForm
Notice that each field on the Address component is mapped to a column of its own. Also, you specified explicit column names for a few of the
Cannot create an instance of the abstract class or interface 'Firefighter'
With a source control system, you have a full development history of everything you ve committed always. Have you ever wished you had the version from last Friday where everything worked correctly, and not the mess you created on Monday when you were tired after a long and eventful weekend Of course, you didn t think about making a secure copy on Friday. And now you have to look for a nasty bug, and you don t have working code to compare. With a source control system, that s not a problem. You always have a full history of everything you ve done. You can pull the version from Friday (assuming, of course, that you didn t forget to commit!). You can pull and check every version from the time you set up your source control system. If you can pull every historical version that exists in your repository, nothing prevents you from reverting the changes you made to the current version. For example, the bad code you wrote after an eventful weekend can be replaced with a working copy in a minute. Most source control systems let you lock a file one way or another. Think about a situation in which you want to have a file just for you. You don t want anyone changing something while you work on this particular-new-very-important feature. With some source control systems, you can explicitly lock the file you re working on: no one can edit the file, but everyone can still pull it and compile with it. Some systems only let you mark the file as locked: others aren t prevented from editing other files, but no one can check out a file someone else locked. Either way, you can have the file available to only you. Source control systems let you label revisions if you want. Assume you re releasing a new version. The revision number is 4711. Do you have to remember it, in case you have to fix a bug in this particular version when it s in production with a customer No: you can label this revision by giving it a meaningful name and marking it so it will be easy to find and work with. If needed, you can take the labeled version, fork it, and set a separate CI process for it. Let s say you ve found a bug in a labeled production version. You ve fixed the bug in this version, but it also resides in the main version. That means you ll have to implement the fix there, too. But you don t have to do this manually. In most cases, you can merge the changes you ve made in the labeled version with the main version using only source control system features.
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