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Do any of these sound familiar We re going to answer these questions in this chapter. We ll start by looking at Hibernate Search s SearchFactory, which is the key entry point to Lucene. It allows access to Directory objects and IndexReaders. We ll look at the effects that sharding has on these classes, and along the way we ll also see what goes on when indexing multiple entities. One of the things that developers must assess is whether or not the default DirectoryProviders included with Hibernate Search are sufficient for their purposes. In the event they are not, you can write a custom one. We ll discuss what you must take into account in this situation. We ll also show you how to access the legacy Lucene document and several related values by utilizing a projection, and we ll demonstrate how it can affect performance. We believe you ll be pleasantly surprised, because accessing native Lucene is much easier than you think.

Table 25-1. Relative execution time of programming languages Language C++ Visual Basic C# Java PHP Python Type of Language Compiled Compiled Compiled Byte code Interpreted Interpreted Execution time relative to C++ 1:1 1:1 1:1 1.5:1 >100:1 >100:1

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Before I leave this section, I d like to say a few words about unhandled exceptions that could occur in a distributed application such as a Web site or Web service . In an ideal world, a server application that experiences an unhandled exception should log it, send some kind of notification back to the client indicating that the requested operation could not complete, and then the server should terminate . Unfortunately, we don t live in an ideal world, and therefore, it may not be possible to send a failure notification back to the client . For some stateful servers (such as Microsoft SQL Server), it may not be practical to terminate the server and start a brand new instance . For a server application, information about the unhandled exception should not be returned to the client because there is little a client could do about it, especially if the client is implemented by a different company . Furthermore, the server should divulge as little information about itself as possible to its clients to reduce that potential of the server being hacked . Note The CLR considers some exceptions thrown by native code as corrupted state exceptions

To implement this pattern in J2EE, you can use a data access object to wrap remote database interaction and decouple it from an EJB. If the remote data being accessed is client-specific, the DAO could be invoked from a session bean. If the data is shared, the DAO could be used as a helper for an entity bean.

1. In the Computer Management administrative tool, create a local user account, named Post, for posting phone book data, and clear the User Must Change Password At Next Logon check box. Make this account a member of the Guests group. Do not make this a domain user account.

void CustomServerVal (object source, ServerValidateEventArgs args) { try { if ( args.Value.Equals("Hello") ) { Msg.Text="ServerValidation called and TRUE returned."; args.IsValid=true; } else { Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } } catch { Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } }

While the use of the if(false) construct works well for commenting out a block of code in Java methods, it doesn t behave as expected for around advice that calls proceed() in its body. In this case, if(false) in the advice body results in bypassing the captured join point. The reason is that unless the around advice calls proceed(), the captured join point will not be executed at all. Now the advice is doing exactly the opposite of what we expected; we wanted the advice to leave the program flow unaltered as if the advice did not exist and instead it eliminated the captured join point s execution.

Setting Namespace Information The information you can pass through the SetContext method helps the XPath processor to resolve any namespace references in the expression If no prefix appears in the expression, it is assumed that the namespace URI for all nodes is the empty namespace Otherwise, you must let the processor know about defined prefix and namespace URI mappings You create an XmlNamespaceManager object, pack it with all the needed information, and then use the SetContext method to register it with the XPath expression object, as shown here: // Create the navigator XPathDocument doc = new XPathDocument(fileName); XPathNavigator xnm = docCreateNavigator(); // Create and populate the XML namespace manager XmlNamespaceManager xnm XmlNamespaceManager(navNameTable); xnmAddNamespace("dd", "urn:dino-e"); xnmAddNamespace("es", "http://wwwcontosocom"); // Set the expression's context XPathExpression expr = navCompile(xpathExpr); exprSetContext(xnm); The .

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