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To develop this application, you will need at least three videos in the WMV format as well as corresponding JPG thumbnail images for each (I made my thumbnail images about 100 pixels wide and tall). For simplicity, I named my videos video1.wmv, video2.wmv, and so on, and my corresponding thumbnails video1.jpg, video2.jpg, and so on.

variables that you care about and should be saved into permanent storage must either be a Java primitive or implement the java.io. Serializable interface.

The point of the PrePassivate callback is to give the bean a chance to prepare for serialization This may include copying nonserializable variable values into Serializable variables and clearing unneeded data out of those variables to save total disk space needed to store the bean Most often the prepassivation step consists of releasing heavy-duty resources such as open database, messaging server, and socket connections that cannot be serialized A well-behaved bean should ensure that heavy-duty resources are both closed and explicitly set to null before passivation takes place From the perspective of a bean instance, there isn t much of a difference between being passivated and being destroyed In both cases, the current instance in memory would cease to exist As a result, in most cases you ll find that the same actions are performed for both the PreDestroy and PrePassivate callbacks, as we do in listing 32.

Click the Edit button next to the installed WYSIWYG editor; this allows you to customize the editor for that specific INPUT FORMAT, as shown in Figure 7-22.

Windows Vista ships with sample WMV videos. These can usually be found in C:\Users\Public\Videos\Sample Videos. If you cannot find them there, search for *.wmv to find them. Windows 7 ships with one video called Wildlife.wmv located at C:\Users\Public\Videos\Sample Videos.

Pretty much the same applies for the PostConstruct PostActivate pair For both callbacks, the bean needs to do whatever is necessary to make itself ready to service the next incoming request Nine times out of ten, this means getting hold of resources that either are not instantiated or were lost during the serialization/deserialization process Again, listing 32 is a good example since the javasqlConnection object cannot be serialized and must be reinstantiated during activation Destroying a stateful session bean In listing 32, the cancelAccountCreation and createAccount methods are marked with the @Remove annotation Beyond the obvious importance of these methods in implementing vital workflow logic, they play an important role in maintaining application server performance Calling business methods marked with the @Remove annotation signifies a desire by the client to end the session As a result, invoking these methods triggers immediate bean destruction.

To gain an appreciation for this feature, consider what would happen if it did not exist If remove methods were not an option, the client would have no way of telling the container when a session should be ended As a result, every stateful bean instance ever created would always have to be timed out to be passivated (if the container implementation supports passivation) and timed out again to be finally destroyed In a highly concurrent system, this could have a drastic performance impact The memory footprint for the server would.

With that, let s fire up Visual Studio 2010 and create our Silverlight video player:

constantly be artificially high, not to mention how there would be wasted CPU cycles and disk space used in the unnecessary activation/passivation process. This is why it is critical that you remove stateful bean instances when the client is finished with its work instead of relying on the container to destroy them when they time out. Believe it or not, these are the only few stateful bean specific features that we needed to talk about! Before concluding this section on stateful beans, we ll briefly summarize the differences between stateful and stateless session beans as a handy reference in table 3.2.

Note: There are a number of options to upload and insert images through the WYSIWYG editor. I have had good luck with IMCE ( http://drupal.org/project/imce) and Insert (http://drupal. org/project/insert). If you enable one of these modules, you will need to click Buttons and Plugins and select the appropriate check boxes.

Table 3.2 The main differences between stateless and stateful session beans Features Conversational state Pooling Performance problems Lifecycle events No Yes Unlikely PostConstruct, PreDestroy Yes Stateless Yes No Possible PostConstruct, PreDestroy, PrePassivate, PostActivate No Stateful