Vorpal2 Client

Since rewriting Vorpal2 core framework, I’ve made a number of changes to the client side. I first introduce Vorpal client here; in Vorpal2 client, the programming model remains the same but bootstrapping and login in XMPP server have been change. Lets look at these changes.

Component Class

Every Vorpal application, whether its server or client side, requires a configuration file for startup. This is an XML file. The only change here is the component-class entry. This has changed from com.kenai.jabberwocky.framework.client.JabberwockyClientComponent to c.k.j.f.c.XMPPClientComponent. If you have written a client application, the following in red is what you need to change in your configuration file

<connection port=”5222″ domain=”batcomputer”>
   <component-class name=”com.kenai.jabberwocky.framework.client.XMPPClientComponent”/>
   <classes-root>classes</classes-root>
   <packages>
      <package name=”com.acme.xmpp.client”/>
   </packages>
   <properties>
      <property name=”vorpal.component.description” value=”A component to query the customer’s database”/>
      <property name=”vorpal.component.name” value=”Customer Query Client”/>
   </properties>
</connection>

Bootstrapping Vorpal2 Client

A typical Vorapl2 client starts in 2 different phases; the first is to start CDI (using Weld). You can read about starting CDI in Java SE here. The second phase is to start Vorpal2 framework which will in turn start your Vorpal2 Client application. This is typically done by capturing the ContainerInitialized event.

The following code snippet shows how this is done.

@Inject ClientConnectionManager mgr;

private void containerInitialized(@Observes ContainerInitialized ciEvt) {
   String username = …
   String password = …
   ClientConnectionManager.Connection conn = mgr.createConnection();
   conn.load(new File(“client.xml”));
   if (!conn.login(username, password)) {
         //Authentication failed
   }

   //Vorpal2 client is now started
}

private void containerShutdown(@Observes BeforeShutdown bsEvt) {
   mgr.getConnection().logout();
}

Once we got the ContainerInitialized event, you can create a connection from ClientConnectionManager. The ClientConnectinManager is an ApplicationScoped object which is injected into your startup class. The next step is to load the configuration file. The load() method accepts the configuration either as an InputStream, a File or a ClientComponentConfiguration object. The ClientComponentConfiguration is the object representation of the configuration file; it is JAXB enabled so you can use JAXB to unmarshall a XML configuration file. Alternatively you can also use the helper method ClientComponentConfiguration.read() to return an instance of ClientComponentConfiguration. read() takes either a File or an InputStream as parameter.

After successfully loading the configuration, you can now attempt to login. The login() method will return a false if it fails to login. You can optionally pass a resource into the login() method.

To close a connection, retrieve the default connection from ClientConnectionManager.getConnection() and call the logout() method.

Running Vorpal2 Client

Vorpal2 client applications are dependent on the following 4 runtime JAR files

  • vorpal2.jar
  • weld-se-core.jar
  • weld-se.jar
  • jabberwocky_support2.jar

Due to classloading issues with log4j, jabberwocky_support2.jar MUST the the last JAR file in your CLASSPATH; otherwise Weld will fail initialization.

Client support currently is still very basic. Only clear connections are supported; SSL and other features are planned.

To try Vorpal2 client support, download the latest bundle from here.

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