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The binary element represents binary large objects (BLOBs), which are strings of binary data. You may recall from previous chapters that passing binary data in its native form within XML is not safe. Not all characters produce proper XML. WDDX 1.0 mandates that the binary element contain the Base64-encoded data, although previous versions may have allowed other encodings. In any event, you set the type of encoding used on the encoding attribute, which under WDDX 1.0 is a fixed attribute containing the value base64. This element also allows the length of the binary data and MIME type of the binary data to be included using the length and type attributes. There is not a native binary type in PHP so you will typically handle this , data using PHP strings. For example: <binary encoding="base64" length="9312164" type="video/mpeg"> <!-- Base64-encoded data here --> </binary>

public class RequestValidatingListener implements ActionListener { public void processAction(ActionEvent event) throws AbortProcessingException { FacesContext context = FacesContext.getCurrentInstance(); Application app = context.getApplication(); Request req = (Request) app.evaluateExpressionGet(context, "#{r}", Request.class); if (!req.isValid()) { context.addMessage("f:w", new FacesMessage( FacesMessage.SEVERITY_ERROR, "weight too heavy for the patron", null)); throw new AbortProcessingException(); } } }

Although you could work with WDDX using the XML parsers in PHP the wddx extension provides , quick and simple functionality for performing the majority of serialization and unserialization routines required to convert data and WDDX packets in PHP Although not every WDDX data type . element can be created during serialization using this extension, they are all supported during unserialization into some sort of native PHP data type.

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Note All output produced by the wddx extension shown in this chapter has been formatted for presentation. Because WDDX serialization does not add additional whitespace such as indentation and newlines, I have altered the output for readability.

On the Windows platform, the wddx extension is enabled by default. It is built into PHP , so you don t need to modify the php.ini file to use the extension. On other platforms, you must build PHP with wddx support. You can accomplish this using a configure flag: --enable-wddx

Note that the properties of the Request object will have been updated in the Update Domain Values phase while the action listener is executed in the Invoke Application phase. Now, run the application, and it should continue to work (see Figure 3-28).

Note There is some disagreement about how to deal with defects. The consensus is that, if possible, defects should be corrected in the iteration in which they were identified. This is reflected in my approach of adding them to the iteration backlog. However, what should you do if there are unresolved defects when the iteration is finished There are basically two options. First, you could create a new user story to address the defect. This would defer the resolution to a future iteration. The second option is to state that the user story was not completed, since it has known defects, and put the user story back on the project backlog. The argument for the latter approach is that you can t really say the user story is complete. Ultimately, you ll probably need to decide this on a case-by-case basis.

CHAPTER 15 WEB DISTRIBUTED DATA EXCHANGE (WDDX)

The wddx extension is built upon the xml extension, which also must be present. You can find additional information about the xml extension, including how to build it with PHP in , 8.

You can serialize data into WDDX packets in two ways. The first method is using a single function call that builds a complete packet based upon the parameters passed. The second method is slightly more involved, but not much, and allows variables to be added to the structure in multiple calls. The method used really depends upon the data an application is processing and when it is available. For instance, you could serialize a few predetermined variables easily in a single function call, but when trying to serialize data from database results, it is usually easier to serialize rows as you iterate through the result set.

Summary

Some defects can significantly affect the ability to work on other tasks. These should be identified as such to help with the prioritization of tasks. The term I ll use to describe this is blocking.

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