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In onCreate(), we register our list widget as having a context menu, which we fill in via our populateMenu() private method, by way of onCreateContextMenu(). We also implement the onCreateOptionsMenu() callback, indicating that our activity also has an options menu. Once again, we delegate to populateMenu() to fill in the menu. Our implementations of onOptionsItemSelected() (for options menu selections) and onContextItemSelected() (for context menu selections) both delegate to a private applyMenuChoice() method, plus chaining upward to the superclass if none of our menu choices was the one selected by the user. In populateMenu(), we add seven menu choices, each with a unique identifier. Being lazy, we eschew the icons. In applyMenuChoice(), we see if any of our menu choices were chosen. If so, we set the list s divider size to be the user-selected width. Initially, the activity looks the same in the emulator as it did for ListDemo, as shown in Figure 11 1.

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data caching, you would store every key in two places in the database, which would be used as a last resort, and duplicated in the in-memory cache. The VerifyKey() function would perform the database lookup only if the cached item is not found. For more information about caching, refer to 26. However, even if you make this enhancement, the essential design of this web service remains the same. The only difference is how the LicenseKey is stored and retrieved in between requests.

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For testing purposes, the add-in automatically creates a test case diagram from the controllers on your robustness diagrams (see Figure 12-4). From these controllers, it s then possible to write executable unit tests for each of the test cases. The test case diagram in Figure 12-4 is based on the robustness diagram in Figure 5-10. Notice that each test case is linked to a controller. In other words, there s one test case per controller. The relationship between the test case and the controller is realizes (the same relationship that s used to show classes implementing/realizing an interface).

The potential problem with this example is that it requires a license key to be submitted with each method call as a parameter. This can be a bit tedious. To streamline this process, you can use a custom SOAP header. SOAP headers are separate pieces of information that are sent, when required, in the header section of a SOAP message. These headers can contain all the same data types you use for method parameters and return values. The advantage of SOAP headers is just the

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convenience. The client specifies a SOAP header once, and the header is automatically sent to every method that needs it, making the coding clearer and more concise. You can also change the header details without being forced to edit the signature of every web method. To create a custom SOAP header, you first need to define a class that inherits from the SoapHeader class (which is found in the System.Web.Services.Protocols namespace). You can then add all the additional pieces of information you want it to contain as member variables. In the following example, the SOAP header simply stores the license key:

Public Class LicenseKeyHeader Inherits System.Web.Services.Protocols.SoapHeader Public Ticket As String Public Sub New(ByVal ticket As String) Me.Ticket = ticket End Sub Public Sub New() Ticket = Guid.NewGuid().ToString() End Sub End Class

Choosing a height (say, 16 pixels) from the menu changes the divider height of the list to something garish, as shown in Figure 11 4.

Exercise The diagram in Figure 12-4 would quickly become quite difficult to work with. Any ideas why

Notice that this class is slightly enhanced over the LicenseKey class in the previous example. The default constructor now generates a random ticket value automatically. Next, your web service needs a public member variable to receive the SOAP header:

Public Class StockQuote_SoapSecurity Inherits WebService Public KeyHeader As LicenseKeyHeader ' (Other web service code goes here.) End Sub

The web service requires one last ingredient. Each web service method that wants to access the LicenseKeyHeader must explicitly indicate this requirement with a SoapHeader attribute. The attribute indicates the web service member variable where the header should be placed.

You can right-click each test case and add individual scenarios (see Figure 12-5).

You can trigger the context menu, shown in Figure 11 5, by tapping and holding on any item in the list. Once again, choosing an option sets the divider height.

<WebMethod()> _ <SoapHeader("KeyHeader", Direction:=SoapHeaderDirection.In)> _ Public Function GetStockQuote(ByVal ticker As String) As Decimal ... End Function

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