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// This field is not stored with the document; it is indexed, but it is // not tokenized prior to indexing. doc.add(new Field("uid", uid(f), false, true, false)); HTMLParser parser = new HTMLParser(f); // Add the tag-stripped contents as a Reader-valued Text field so it will // get tokenized and indexed. doc.add(Field.Text("contents", parser.getReader())); // Add the summary as an UnIndexed field, so that it is stored and // returned with hit documents for display. doc.add(Field.UnIndexed("summary", parser.getSummary())); // Add the title as a separate Text field, so that it can be searched // separately. doc.add(Field.Text("title", parser.getTitle())); // return the document return doc; } private HTMLDocument() { } }

Handler2 +Request( )

This isn t always the case when you use technologies other than ASP.NET, where you may end up with differences between your service code and its description. You can see what the default ASMX file markup looks like here:

After we create the Lucene document from the file, we need to add the document to the index. We call the addDocument() method on the instance of the IndexWriter we created:

The roles assumed by the players in the pattern are as follows:

It s pretty straightforward and might seem like little more than a file that describes the language of the code-behind file, the location of the code-behind file, and the main class that implements your service. However, note the <%@ and trailing %>. These denote an ASP .NET directive and tell ASP .NET to get ready to work its magic. The WebService is the directive itself, and in this case you re telling ASP .NET to fire up its web service processing infrastructure (if you look back to Listing 3-3, you ll see another ASP.NET directive, Page, which tells ASP .NET to generate a web page). The code-behind file is where the action happens in your web service. You can see the default example in Listing 5-1.

// add the document to the index try { Document doc = HTMLDocument.Document(file); writer.addDocument(doc); } catch (IOException e) { System.out.println("Error adding document: " + e.getMessage()); } catch (InterruptedException e) { System.out.println("Error adding document: " + e.getMessage()); }

To test whether you understand the Chain of Responsibility pattern, cover the lefthand column of the table below and see if you can identify its players among the items from the illustrative example (Figure 8-1), as shown in the righthand column. Then check your answers against the lefthand column.

The last step is to optimize the index, which means that Lucene will merge all of the different segment files it stored in the directory into one file. This improves the performance of queries. We also close the IndexWriter, which removes the lock from the index directory. We are using the index directory as the lock directory instead of the default Java temporary directory because our portlet does not share the same Java temporary directory when it runs on Pluto.

using using using using System; System.Web; System.Web.Services; System.Web.Services.Protocols;

//optimize the index writer.optimize(); //close the index writer.close();

The customer Clerks, supervisors, managersn The next most senior handler The customer s request, query, or problem

[WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class Service : System.Web.Services.WebService { public Service () { //Uncomment the following line if using designed components //InitializeComponent(); } [WebMethod] public string HelloWorld() { return "Hello World"; } }

If you do not remember to call the close() method, your future index updates will fail because of the lock file.

As we ll see next, the most efficient implementation of the Chain of Responsibility pattern depersonalizes the Handlers, reducing them to the operations that they perform. In terms of the design, there can be variations on Figure 8-2: The handlers may differ only in terms of the values of the state they store (e.g., a limit on an amount), or in the behavior of the Request method. In this case, the IHandler interface can be dispensed with, and the Handlers can still be instantiated in sufficient variety. The UML diagram implies only one instantiation of each Handler, resulting in one handler at each level in the chain. Practically speaking, there might be several identical handlers at certain levels (e.g., clerks in a bank). A different design is required to accommodate the latter case. This design is shown in the upcoming example code.