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The available templates are as follows: Sequential Workflow Console Application: This contains a simple sequential workflow and the code for a Windows console application that can host it. Sequential Workflow Library: This contains a simple sequential workflow that can be published as an activity or a web service. Workflow Activity Library: This allows you to create a new activity for the WF Toolbox. State Machine Workflow Console Application: This contains a state machine workflow and the code for a Windows console application that can host it. State Machine Workflow Library: This contains a simple state machine workflow that can be published as an activity or a web service. Empty Workflow Project: This provides a simple workspace that allows you to add your own workflow application types. You can experiment with these to find the template that best suits you. For this example, you will step through building a simple sequential workflow console

As the examples suggest, Mediator and Observer are very similar patterns. Mailing lists, chat rooms, and blogs all involve communication between individuals who actively sign up to the activity. The difference is that the Mediator centralizes the communication between colleagues, whereas the Observer distributes control of information by differentiating between subjects (publishers) and observers (subscribers). The communication in the Mediator pattern is easier to understand. Colleagues send messages to a mediator and the transmission of the information further to whomever is currently in the group is handled there, in one place (consult Example 9-3 again). In the Observer pattern, observers wait to be invoked with (presumably relevant) information from more than one subject. The coupling is closer in the Mediator, as the client or colleagues send messages that will go to other colleagues (though not by name). The example is the chat room. In the Observer, the coupling is one step removed, in that observers do not send any information; they wait to receive it from subjects, who distributed it to all who have subscribed. An example is the blog. The question of a constraint on communication is answered differently by the two patterns. The Mediator keeps the constraint in the mediator object, deciding how, who, and when should get the next message. In the Observer, there can be a protocol between an observer and subject, but it would be more varied and maintained on both sides. These observations are summarized in Table 9-1.

Portlets may flush the content stored in a partially full buffer to the user s web browser with the flushBuffer() method. Any errors while writing content will cause flushBuffer() to throw an IOException. This method commits the response, which means that the portal sent content to the user s web browser.

application called FirstWorkFlowApp (see Figure 9-1). And, yes, if you were wondering this will be a Hello World application! When you create this application using the template, you ll be taken to the Visual Studio IDE with the Workflow Designer open, and the set of available activities open in the Toolbox (see Figure 9-2).

To determine if the response is committed, the RenderResponse interface provides the isCommitted() method, which returns true if content has already been sent.

Table 9-1. Comparison of Mediator and Observer patterns Mediator Client creates Messages initiated by Messages sent to Constraints Colleagues and a mediator Client and colleagues Mediator then colleagues In the mediator Observer Observers and subjects Subject Observers Between the observers and subjects

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This is another useful debugging and optimization tool. When set to true, it shows the areas of the plug-in that are being redrawn with each frame.

In this chapter, we ll consider the final three core design patterns. The Visitor and Interpreter patterns are well-known in compiler-writing circles. However, they also apply wherever operations are defined on structures according to specific rules, and the operations and structures are defined separately. The Memento pattern rounds out the behavioral group by showing how the state of objects can be saved and restored.

public boolean isCommitted()

Silverlight offers a number of events that you can use to manage application events such as loading, unloading, and full screen changes.

If the response has not yet been committed, the portlet can reset the response, or just the content in the buffer. The reset() method throws away any response properties and the content in the response s buffer. If the portlet would like to keep the properties and just remove the content, it can use the resetBuffer() method.

The Visitor pattern defines and performs new operations on all the elements of an existing structure, without altering its classes.

This specifies the name of the JavaScript event handler that implements the code to execute upon the Silverlight control loading and running properly. This event handler takes three arguments, control, userContext, and rootElement, which contain a reference to the Silverlight control, the user context of that control, and a reference to the root Canvas of the control, respectively. Here s an example: