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Figure 13-1. IMethodInvocation interface members The IMethodInvocation interface has the following properties: Arguments: Contains an IParameterCollection of all of the input, output, and by reference parameters. Inputs: Also contains an IParameterCollection, with only input parameters. InvocationContext: Contains an implementation of IDictionary that allows data to be passed between handlers. MethodBase: An instance of the MethodBase for the actual target. Target: The target object for which you are calling the member. The IMethodInvocation interface has two methods that will return an instance of IMethodReturn: CreateExceptionMethodReturn and CreateMethodReturn. The CreateExceptionMethodReturn method is used to return an exception to the caller. The CreateMethodReturn method will return the results of the target to the caller. The CreateMethodReturn method could be used to intercept a call to the target, such as when caching is desired. An example of how a handler can be created is shown in Listing 13-4. Listing 13-4. Creating a Custom Handler [ConfigurationElementType(typeof(CustomCallHandlerData))] public class CreateFileHandler : ICallHandler { private string m_Filename; public CreateFileHandler(NameValueCollection configValues) { m_Filename = configValues["FileName"]; } public IMethodReturn Invoke(IMethodInvocation input,

Figure 2-6. The maze on the Sagem my700x Listing 2-3. MazeCanvas.java package net.frog_parrot.maze; import javax.microedition.lcdui.*; /** * This class is the display of the game. * * @author Carol Hamer */ public class MazeCanvas extends javax.microedition.lcdui.Canvas { //--------------------------------------------------------// static fields /** * color constant */ public static final int BLACK = 0; /** * color constant */ public static final int WHITE = 0xffffff; //--------------------------------------------------------// instance fields

CHAPTER 8 JOHNNXT IS ALIVE!

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GetNextHandlerDelegate getNext) { System.IO.FileStream fileStream = File.Create(m_Filename); input.InvocationContext["CreatedFileStream"] = fileStream; IMethodReturn msg = getNext()(input, getNext); System.IO.FileStream returnedStream = msg.InvocationContext["CreatedFileStream"] as System.IO.FileStream; //clean up file resources if any exist if (returnedStream != null) { try { returnedStream.Close(); } catch {} } if (fileStream != null) { try { fileStream.Close(); } catch {} } return msg; } } The ICallHandler s Invoke method allows for preprocessing and postprocessing of the target. Another way to put it is that parameters can be modified before the target member is actually called, and the returned results can also be modified before they are returned to the caller. The IMethodReturn interface is shown in Figure 13-2. It contains four properties that return the necessary data to the caller and policy handlers: Exception: Returns an exception if one occurred. InvocationContext: Returns an IDictionary instance that contains any data that may have been passed around between the handlers in the pipeline. Outputs: Contains all the parameters that were passed in, including the input parameters. ReturnValue: Returns the resulting return value from the target callee, if there was one.

/** * a handle to the display. */ private Display myDisplay; /** * The data object that describes the maze configuration. */ private Grid myGrid; /** * Whether the currently displayed maze has * been completed. */ private boolean myGameOver = false; /** * maze dimension: the width of the maze walls. */ private int mySquareSize; /** * maze dimension: the maximum width possible for the maze walls. */ private int myMaxSquareSize; /** * maze dimension: the minimum width possible for the maze walls. */ private int myMinSquareSize; /** * top corner of the display: X coordinate */ private int myStartX = 0; /** * top corner of the display: Y coordinate */ private int myStartY = 0; /** * how many rows the display is divided into. */ private int myGridHeight;

Figure 13-2. IMethodReturn properties Configuring a custom handler is no different than configuring a matching rule. If you want to use the NameValueCollection, use the CustomCallHandlerData with the ConfigurationElementType attribute above your class. Otherwise, you can create your own design-time components.

CHAPTER 8 JOHNNXT IS ALIVE!

So now that the matching rules and handlers are defined, how do they fit in when calling a target member of an object from a caller Figure 13-3 shows a high-level view of how a caller makes a call to the target object.

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