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def http:HttpRequest = HttpRequest {

For details about all the practice test options available, see the How to Use the Practice Tests sec tion in this book s Introduction.

If the package fails, the checkpoint file stays in the file system and keeps the last update it had from the last successful checkpoint. If the package is successful, the checkpoint file is deleted. Therefore, the next time the package runs, the checkpoint file will not exist, and the package will start from the first task(s).

Figure 2-3 shows the first execution of the package. At this point, no checkpoint file exists, so the package begins at the Execute SQL Task.

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method: HttpRequest.GET; Method and location: "{REST} {createArgList(args)}"; address onResponseCode: function(code:Integer) { Initial if(code!=200 and onFailure!=null) response onFailure("HTTP code {code}"); } onException: function(ex:Exception) { I/O error if(onFailure!=null) onFailure(ex.toString()); } onInput: function(ip:InputStream) { Success! def fr = FlickrResult {}; def parser = PullParser { documentType: PullParser.XML; input: ip; Create and call onEvent: fr.xmlEvent; XML parser }; parser.parse(); parser.input.close(); if(onSuccess!=null) onSuccess(fr); } }; http.start(); } }

figure 2-3 During the first execution of this package, the Truncate Update Table Task succeeds and is

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XML is a universally used format for communication and storage of information. XML is extensible, platform-independent, and, since it is a text-based format, can be read and written with standard text-editing tools. This chapter describes how to use the Microsoft .NET Framework to read and write XML.

During the execution of the control flow shown in Figure 2-3, the Truncate Update Table Task succeeds, and SSIS writes a checkpoint to the checkpoint file. However, the Data Flow Task fails, which does not update the checkpoint file, and the package stops. At this point, the failure is corrected in the Data Flow Task, and the package is rerun. Figure 2-4 shows the control flow of the rerun package. As you can see, this package failed at step 2 of the first run. After the problem was corrected, the second execution of the package started at step 2 and continued to completion.

In the final part of our service request code loadPage() function is where the action is; it takes a page number and accesses the Flickr service to fetch the photo details for that page Each request ends in a call to either onSuccess or onFailure (if populated), allowing applications to run their own code when the process ends (We ll deal with how our photo viewer uses these functions later) After (double) checking the apiKey and storing the selected page, loadPage() creates a sequence of key/value pairs to act as the arguments passed to the service call The first list argument is the function we re calling on the web service, and the following arguments are parameters we re passing in Flickr s flickrpeoplegetPublicPhotos function returns a list of photos for a given user account, page by page.

figure 2-4 During the second execution of this package, the Data Flow Task is the first task to run, and the package finishes to completion.

Exam objectives in this chapter:

We need to pass in our own key, the ID of the person whose gallery we want to read, the number of photos we want back (the page size to break the gallery up into), and which page we want See the web service API documentation for more details on this function After the argument list we have the HttpRequest object itself The HTTP request doesn t execute immediately Web service requests are commonly instigated from inside UI event handlers; if we performed the request immediately, it would hog the current thread (the GUI thread) and cause our application s interface to become temporarily unresponsive Instead, when start() is called, the network activity is pushed onto another thread, and we assign callbacks to run when there s something ready to act upon (see figure 82) The HttpRequest request declaratively sets a number of properties.

After completion of the last step, called Batch Updates in Figure 2-4, the checkpoint file was deleted.

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