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available memory You ll have to consult the JBoss Cache documentation for eviction policy configuration; the usage of Hibernate region names and eviction settings is similar to EHCache JBoss Cache also supports invalidation instead of replication of modified data in a cluster, a potentially better performing choice The Hibernate query cache, however, requires replication You can also switch to OPTIMISTIC locking instead of pessimistic, again boosting scalability of the clustered cache Doing so requires a different Hibernate cache provider plug-in, orghiberntecacheOptimisticTreeCacheProvider Finally, let s look at the JGroups cluster communication configuration The order of communication protocols is extremely important, so don t change or add lines randomly Most interesting is the first protocol, <UDP> The loopback attribute must be set to true if node A is a Microsoft Windows machine (it isn t in this case).

If a printer has multiple trays that regularly hold different paper sizes, you can assign a form to a specific tray. A form defines a paper size. Users can then select the paper size from within their application. When the user prints, Windows XP Professional automatically selects the paper tray that holds the correct form. Examples of forms include the following: Legal, A4, Envelopes #10, and Letter Small. To assign a form to a paper tray, complete the following steps: 1. Click Start, and then click Printers And Faxes. 2. In the Printers And Faxes window, right-click the icon of the appropriate printer, and then click Properties. 3. In the printer s Properties dialog box, on the Device Settings tab, in the box next to each paper tray, click the form for the paper type for the tray, as shown in Figure 12-3. 4. Click OK.

Managing Printers 12-11

The other JGroups attributes are more complex and can be found in the JGroups documentation They deal with the discovery algorithms used to detect new nodes in a group, failure detection, and, in general, the management of the group communication After changing the cache concurrency strategy of your persistent classes to transactional (or read-only) and creating a treecachexml file for node A, you can start up your application and look at the log output We recommend enabling DEBUG logging for the orgjbosscache package; you ll then see how JBoss Cache reads the configuration and reports node A as the first node in the cluster To deploy node B, deploy the application on that node; no configuration file needs to be changed (if the second node also isn t a Microsoft Windows machine) If you start this second node, you should see join messages on both nodes.

After you have set up a paper tray, users specify the paper size from within applications. Windows XP Professional knows in which paper tray the form is located.

This section explains what a separator page is, describes its functions, lists separator page files included in Windows XP Professional, and then describes how to set up a separator page.

Your Hibernate application now uses fully transactional caching in a cluster There is one final optional setting to consider For cluster cache providers, it may be better to set the Hibernate configuration option hibernatecacheuse_ minimal_puts to true When this setting is enabled, Hibernate adds an item to the cache only after checking to ensure that the item isn t already cached This strategy performs better if cache writes (puts) are much more expensive than cache reads (gets) This is the case for a replicated cache in a cluster, but not for a local cache or a cache provider that relies on invalidation instead of replication No matter if you re using a cluster or a local cache, you sometimes need to control it programmatically, either for testing or tuning purposes..

A separator page is a file that contains print device commands. Separator pages have two functions:

To identify and separate printed documents, making it easier for users to find their documents on printers used by more than one person. To switch a printer to a different print mode. Some printers support different print modes that take advantage of different device features. You can use separator pages to specify the correct page description language. For example, you can specify PostScript or Printer Control Language (PCL) for a printer that can switch between different print modes but cannot automatically detect which language a print job uses.