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The video buffer callback is critical, and it must be lean and mean. It gets called continuously and must not create any objects (see Listing 7-16). Like the previous callback, it attaches to the current thread. It also calls the static void method doom.jni.Natives.OnImageUpdate(int[] pixels). But before calling this method, it must set the pixels into the Java array (jImage): (*env)->SetIntArrayRegion(env, jImage, 0, iSize, (jint *) data) data is an array of integers already formatted as 32-bit ARGB pixels, as required by Android, and iSize is the size of the display calculated in the previous callback. Listing 7-16. Sending Video Pixels /** * Image update Java callback. Gets called many times per sec. * It must not look up JNI classes/methods or create any objects; otherwise * the local JNI ref table will overflow & the app will crash */ void jni_send_pixels(int * data) { JNIEnv *env;

Both of these methods set the _NextOperation variable to each method name s respective value. Thus, the And method sets _NextOperation to And and the Or method sets _NextOperation to Or. These two functions help make using the SqlConditionGroup more intuitive in code. For example, if you wanted a group containing a statement like A=1 AND B=2 OR C=3, then the code would look something like this: Group.AddCondition("A=1") Group.And() Group.AddCondition("B=2") Group.Or() Group.AddCondition("C=3") Because the _NextOperation is retained after calling the And or Or functions, you only have to call And or Or once when adding a series of conditions. Thus, the statement (A=1 OR B=2 OR C=3 OR D=4 AND E=5 AND F=6 AND G=7 AND H=8) could be written like this in code: Group.AddCondition("A=1") Group.Or() 'You could also place this line first, if you wanted Group.AddCondition("B=2") Group.AddCondition("C=3") Group.AddCondition("D=4") Group.And() Group.AddCondition("E=5") Group.AddCondition("F=6") Group.AddCondition("G=7") Group.AddCondition("H=8") The intricacies of using the SqlQuery and SqlConditionGroup are covered later in this chapter.

Note We can also configure log4j through an initialization servlet. Consult 2 for more on this topic.

Before you can migrate data from the anonymous profile into the authenticated profile, you need to get a reference to the anonymous profile. This is accomplished by calling Profile.GetProfile(e.AnonymousId) and storing the resulting value in the AnonymousProfile variable. The authenticated profile is accessible via the Profile object. Next, you have to determine the most appropriate way to migrate data. The TotalPageHits property represents the total number of pages this user has visited on the site. Because it represents a running total, it makes sense to add the values from the Profile and the AnonymousProfile together. If the user visited 50 pages as an authenticated user and then 5 pages as an anonymous user, you would definitely want the final TotalPageHits value to equal 55. The LastAdDate property represents the last time the user was shown an advertisement. This profile property ensures that users are only accosted with full-page ads once every couple of days. This property should only be migrated over from the anonymous profile if AnonymousProfile.LastAdDate is greater than Profile.LastAdDate. This ensures that the most recent ad date will be used so that the customer is not accidentally shown another advertisement too early. Basically, you need to analyze each profile property that has the allowAnonymous parameter set to True, and determine the best way that anonymous data should be merged with authenticated data. This may require that you append, add, subtract, average, or overwrite data, depending on what you are storing and why.

Now that you know how to work with basic profile properties, you can create a simple targeted advertisement. Many websites have a ton of content, but most of that content can easily be categorized. A sports news site, for instance, may have thousands of stories, but those stories most likely fall into a category such as baseball, football, basketball, hockey, and so on. If someone is always reading about baseball, chances are that person is a baseball fan. If a person is always reading about football, chances are that person is a football fan. This is important information, especially if you are selling sports-related items. You would prefer that an autographed basketball ended up on a basketball fan s screen instead of a hockey fan s screen. This is where profile properties come into play. If you haven t already, go ahead and create a new web project in which to store the examples from this chapter. Or you can opt to open the sample application for this chapter, available from the Source Code area of the Apress website (http://www.apress.com), and just follow along.

if ( !g_VM) { return; } (*g_VM)->AttachCurrentThread (g_VM, (void **) &env, NULL); // Send img back to Java. if (jSendImageMethod) { (*env)->SetIntArrayRegion(env, jImage, 0, iSize, (jint *) data); // Call Java method (*env)->CallStaticVoidMethod(env, jNativesCls , jSendImageMethod , jImage); } }