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// If there is no current maze, create one and draw it. if(myGrid == null) { int width = getWidth(); int height = getHeight(); // create the underlying data of the maze. myGrid = new Grid(myGridWidth, myGridHeight); // draw the maze: // loop through the grid data and color each square the // right color for(int i = 0; i < myGridWidth; i++) { for(int j = 0; j < myGridHeight; j++) { if(myGrid.mySquares[i][j] == 0) { g.setColor(BLACK); } else { g.setColor(WHITE); } // fill the square with the appropriate color g.fillRect(myStartX + (i*mySquareSize), myStartY + (j*mySquareSize), mySquareSize, mySquareSize); } } // fill the extra space outside of the maze g.setColor(BLACK); g.fillRect(myStartX + ((myGridWidth-1) * mySquareSize), myStartY, width, height); // erase the exit path: g.setColor(WHITE); g.fillRect(myStartX + ((myGridWidth-1) * mySquareSize), myStartY + ((myGridHeight-2) * mySquareSize), width, height); // fill the extra space outside of the maze g.setColor(BLACK); g.fillRect(myStartX, myStartY + ((myGridHeight-1) * mySquareSize), width, height); } // draw the player (red): g.setColor(255, 0, 0); g.fillRoundRect(myStartX + (mySquareSize)*myPlayerX, myStartY + (mySquareSize)*myPlayerY, mySquareSize, mySquareSize, mySquareSize, mySquareSize); // erase the previous location if((myOldX != myPlayerX) || (myOldY != myPlayerY)) { g.setColor(WHITE); g.fillRect(myStartX + (mySquareSize)*myOldX, myStartY + (mySquareSize)*myOldY, mySquareSize, mySquareSize); }

4. If the member (property or method) of the class (or the same member in a class within its inheritance hierarchy) carries a handler attribute, the application block applies this handler and continues the discovery process. The final order of individual handlers is always unspecified, although handlers for property accessors (get and set) usually occur earlier in the handler pipeline. 5. If the configuration for the Policy Injection Application Block contains matching rules that select the class or member, the application block applies these handlers. However, it will not overwrite, change, or replace any handlers defined at higher precedence. The application block applies policies defined later in the configuration closer to the target (later in the handler pipeline) and applies handlers within each policy in the order they occur in the configuration.

CHAPTER 8 JOHNNXT IS ALIVE!

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// if the player has reached the end of the maze, // you display the end message. if(myGameOver) { // perform some calculations to place the text correctly: int width = getWidth(); int height = getHeight(); Font font = g.getFont(); int fontHeight = font.getHeight(); int fontWidth = font.stringWidth("Maze Completed"); g.setColor(WHITE); g.fillRect((width - fontWidth)/2, (height - fontHeight)/2, fontWidth + 2, fontHeight); // write in red g.setColor(255, 0, 0); g.setFont(font); g.drawString("Maze Completed", (width - fontWidth)/2, (height - fontHeight)/2, g.TOP|g.LEFT); } } /** * Move the player. */ public void keyPressed(int keyCode) { if(! myGameOver) { int action = getGameAction(keyCode); switch (action) { case LEFT: if((myGrid.mySquares[myPlayerX-1][myPlayerY] == 1) && (myPlayerX != 1)) { myOldX = myPlayerX; myOldY = myPlayerY; myPlayerX -= 2; repaint(); } break; case RIGHT: if(myGrid.mySquares[myPlayerX+1][myPlayerY] == 1) { myOldX = myPlayerX; myOldY = myPlayerY; myPlayerX += 2; repaint(); } else if((myPlayerX == myGrid.mySquares.length - 2) && (myPlayerY == myGrid.mySquares[0].length - 2)) { myOldX = myPlayerX; myOldY = myPlayerY;

The Policy Injection Application Block has some limitations due to its design of using handlers to address cross-cutting concerns, as opposed to using custom application code: Other business logic routines cannot be called from a handler. For example, the code in a handler that logs method calls cannot handle additional context information that is not in the call message at least not without significant effort. The Policy Injection Application Block cannot inject policies for class constructors or non-public members of classes. The Policy Injection Application Block can intercept and inject policies only for objects that meet the requirements of the built-in interception mechanism. The built-in mechanism supports classes that either inherit a known interface or inherit from the abstract base class. However, it is possible to replace a built-in interception mechanism with a custom mechanism. Matching rules cannot use runtime information, such as parameter values, to target classes and members. Matching rules cannot contain dynamic logic that changes over time, since the Policy Injection Application Block caches policies as it initializes, as opposed to reevaluating them on each call. The Policy Injection Application Block cannot store state between calls. If it did so, multithreaded applications could have issues.

CHAPTER 8 JOHNNXT IS ALIVE!

As an example of using the Policy Injection Application Block, we ll return to the simple class that was implemented in Listing 13-2 and add a new attribute-defined policy to validate the inputs. Then we ll create a policy via the application configuration file, which will have an instrumentation handler as well.

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