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The Client defines and creates an object structure and populates it with data. This process is not part of the pattern, however. The object structure is specified by a hierarchy of Element classes, three of which are shown here: Element, ElementA, and ElementB. The Visitor methods, VisitorMethod1 and VisitorMethod2, are defined in separate classes. Objects of these classes conform to an IVisitor interface. Although the object structure and Visitors are separate, some implementations of the Visitor pattern might require a small change to the objects to make them visitor-ready. The players in the Visitor pattern are:

be String/String array key/values pairs. This method will throw an IllegalArgumentException if any of the keys in the Map are not String objects or if any of the values in the Map are not String arrays. The setRenderParameters() method will also throw an IllegalArgumentException if the Map is null.

This is now the code that will execute when this code block is reached. To turn this application into a Hello World application, you just need to add a couple of lines of code to it to get it to write out the message, and read in a new line before exiting. When you re done, the ExecuteCode function will look like this:

Classes that contain methods that iterate through the object structure and apply operations to its elements Note that the object structure is not necessarily a class hierarchy. In general, one node in the object structure can refer to another object of any type whatsoever, and the visitor can traverse to that other object. The interesting issue with subclass relationships among the object structure nodes is whether the visitor actions can easily be inherited. The Visitor pattern is intended for object structures, so it is often used in conjunction with the Composite pattern. The Composite pattern is responsible for setting up the multilevel structure on which the Visitor pattern then operates.

Portlets will use the PortletContext object to get access to logging, resources, attributes, and initialization parameters, just like servlets in a web application would use a ServletContext object. The PortletContext object provides information and resources from the portlet application. A portlet application context exists for each portlet application installed in a portal. If there is more than one portlet in a portlet application, they share an instance of the PortletContext object, and can use it to set and retrieve application-wide data. Servlets and JSP pages also share the contents of the PortletContext, through the ServletContext. Since the portlet application is also a web application, the servlets and JSPs deployed in the portlet application all use one context.

private void codeActivity1_ExecuteCode(object sender, EventArgs e) { Console.WriteLine("Hello, World!"); Console.ReadLine(); }

You can retrieve the portlet context for a portlet s portlet application with the getPortletContext() method on the PortletConfig interface:

Because the Visitor pattern is one of those with a distinction between the data and some additional and extraneous behavior, we shall develop it in three parts: The object structure The visitor(s) The client

You can now execute the application to get the wonderfully sophisticated Hello World application running as a workflow hosted in a Windows console application (see Figure 9-6).

public PortletContext getPortletContext ()

To test whether you understand the Visitor 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 10-1), as shown in the righthand column. Then check your answers against the lefthand column.

The GenericPortlet class implements the PortletConfig interface, so any subclass of GenericPortlet may just call getPortletContext() on itself. If your portlet directly implements the Portlet interface, your init(PortletConfig config) method must retain a reference to the PortletConfig object.

The simplicity of the application belies the complexity of what is going on under the hood, where the sequential design has been compiled into a workflow that is executed by the WF runtime hosted in the console application. You can see the code for the console application here (it is in Program.cs in your workspace):

The instructor The rules of the course (taken from the notation) Course Lab, Theory, Midterm, Exam Print the course rules Summarize the Lab and Theory totals

The attributes on the portlet context are shared data for the portlets and servlets in a portlet application. These attributes are name/value pairs, with a String object as the key and an Object as the value. The portlet can get access to the portlet context attributes from the PortletContext object.

namespace FirstWorkflowApp { class Program { static void Main(string[] args) { using(WorkflowRuntime workflowRuntime = new WorkflowRuntime()) {