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Creating a WCF service requires the following steps: 1. Define a contract for the service. 2. Implement the service contract. 3. Define the data structures (if any) to carry data from the service to the client. Now that you have a brief idea about creating WCF services, let s create our own service. Begin by creating a new project of type WCF Service Library named EmployeeLibrary. Add an interface to it by using the Add New Item dialog box and name it IEmployeeService (see Figure 12-1).

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

The code in Listing 5-1 defines a class called Service. As you recall, the WebService directive specified this class when it defined Service as the implementing class of the web service logic. The class is decorated with a couple of attributes. The first one ([WebService (Namespace = "http://tempuri.org/")]) sets the namespace for your web service. You should use a namespace when publishing your web service to distinguish it from other services on the Web that may have the same name and to help reinforce your branding. The second attribute ensures that your web service conforms to the WS-I basic profile. The WS-I is a group of technology vendors, including Microsoft, who have developed a set of rules called profiles to define how a web service should work. Profiles ensure that different technologies won t prevent web service clients and servers from communicating with each other. The most common profile is called the Basic Profile. In its simplest sense, the Basic Profile ensures that only data that is common to all technology platforms can be exposed via a web service. Thus, to conform to the Basic Profile, a Java web service cannot expose a Java-specific data type such as Vector. Conversely, a .NET-based service cannot expose a .NET-specific data type such as DataSet. The WebServiceBinding attribute ([WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]) forces your web service to conform to the Basic Profile version 1.1, thus ensuring interoperability. Your final responsibility when developing a web service in ASP.NET is to define which methods your class will export by using the WebMethod attribute. Only the methods that have been attributed with WebMethod will be exposed to the outside world.

Here is our completed Lucene indexer class:

creating a new service by default. Additionally the Add New Item dialog of Visual Studio also provides a template for adding a new WCF Service. However, for the sake of clear understanding, I am not going to use the default code templates.

package com.portalbook.search; import java.io.*;

When you view the running web service in the browser, you ll see the ASP.NET web service description page. From here, if you select methods from the bulleted list, you can inspect and test the web methods that have been exposed using the WebMethod attribute. Should those methods require input parameters, the test page for that method will provide text boxes for you to enter the parameter values. You can see the test page for the default Hello World web service in Figure 5-3.

10

Figure 12-1. Adding a new interface Import the System.ServiceModel namespace at the top of the interface file and add the code shown in Listing 12-1 in the interface.

If you like, you can view the service description by clicking the Service Description link on the test page or by postfixing the URL of the service with WSDL, like this:

import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.demo.HTMLDocument; import org.apache.lucene.document.Document; import org.apache.lucene.index.IndexWriter; public class Indexer { protected IndexWriter writer = null; protected Analyzer analyzer = new StandardAnalyzer(); public void init(String indexPath) throws IOException { //set Lucene lockdir System.setProperty("org.apache.lucene.lockdir", indexPath); //create a new Lucene index, overwriting the existing one. writer = new IndexWriter(indexPath, analyzer, true); } public void indexFiles(String contentPath) throws IOException { File contentDir = new File(contentPath); if (!contentDir.exists()) { throw new IOException("Content directory does not exist."); } if (!contentDir.isDirectory()) { System.out.println(contentPath + " is not a directory."); return; } File[] indexableFiles = contentDir.listFiles(); { if (indexableFiles != null) { for (int ctr = 0; ctr < indexableFiles.length; ctr++) { if (indexableFiles[ctr].isFile()) {

Listing 12-1. Creating the IEmployeeService Interface using using using using using System; System.Collections.Generic; System.Text; System.ServiceModel; System.Data;