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Your application is likely to store role information in a database along with the relationships that associates users to those roles. Figure 5-1 depicts a simple but commonly used database structure for storing users, roles, and user-role assignments. Normally, you pull role information out of the database by executing a query requesting roles for the authenticated user. Again, for simplicity, the example application uses hard-coded role information instead of accessing role information from a database as shown in Listing 5-5. Listing 5-5. Example User-Role Acquisition Method '*************************************************************************** Private Function GetUserRoles(ByVal username As String) As String Select Case UCase(username) Case "BOB" : Return "employee|sales" Case "JANE" : Return "executive|marketing" Case "MARK" : Return "contractor|support|admin" Case Else : Return "" End Select End Function The GetUserRoles function accepts a username as a string and returns a string containing a pipe-delimited list of roles for the user. Again, the username is not case sensitive because the method forces it into uppercase before comparing it to the hard-coded values.

Figure 5-1. Simple entity relationship diagram for storing users, roles, and role assignments in a database

// Play from cache mSounds.get(key).play(); } else { // load clip from disk AudioClip clip = new AudioClip(mContext, id); clip.play(); // cache sound mSounds.put(key, clip); mClipCount++; } Listing 6-12 shows how it is done. Furthermore, AudioManager also implements several methods. First, getInstance() is a singleton method used to provide only one instance of AudioManager. preloadSounds(Context ctx) preloads commonly used sounds. An application context is required for the inner AudioClip class, which is used to wrap the Android media player. The next fragment shows how this method uses the resource IDs of the most common sounds to load them into memory. The goal of this method is to improve performance by keeping these sounds in memory at all times: public void preloadSounds(Context ctx) { int[] IDS = new int[] { R.raw.doropn, R.raw.dorcls, R.raw.pistol, R.raw.wpnup }; // Preload sound WAVs using their IDs Resources res = mContext.getResources(); for (int i = 0; i < IDS.length; i++) { final int id = IDS[i]; final String key = res.getResourceName(id); Log.d(TAG, "PreLoading sound " + key + " ID " + id); mSounds.put(key, new AudioClip(ctx, id)); } } Next, startMusic(Context ctx, int midx) starts the background music given a native music ID. Note that there is only one audio clip for music. This means only one music track can be played at a time. An Android context is required for the AudioClip: public void startMusic(Context ctx, int midx) { // Obtain a the raw music ID from the SoundNames mapping class int id = SoundNames.Music[midx]; if (id == 0) return; try { // Check if the RESOURCE exists on disk mContext.getResources().getResourceName(id);

error(String , Exception , int , LoggingEvent)

Authentication tickets must include a value that identifies the user and can optionally include role information. If your application does not require any role information, then you can issue an authentication ticket without too much hassle using the not intuitively named Forms Authentication.RedirectFromLoginPage method. The RedirectFromLoginPage method accepts two parameters: username and create PersistentCookie. Username is the name of the authenticated user and createPersistentCookie denotes whether the cookie issued to the user is persistent (persists between browser sessions) or deleted when the user closes the browser. The method issues the user an authentication ticket in accordance with the configuration settings in the <forms> element in Web.config and then redirects the user to the ReturnUrl in the query string, if available, or the defaultUrl specified in Web.config. Listing 5-6 is the code from the Click event handler for the btnLogin NoRoles button, which demonstrates how to use the RedirectFromLoginPage method.

Listing 5-6. Issuing an Authentication Ticket Without Role Information '*************************************************************************** Protected Sub btnLoginNoRoles_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles btnLoginNoRoles.Click If AuthenticateUser(txtUsername.Text, txtPassword.Text) Then FormsAuthentication.RedirectFromLoginPage(txtUsername.Text, _ chkRememberMe.Checked) End If End Sub Notice that the event handler first authenticates the user information entered into the form and then calls the RedirectFromLoginPage method. Remember, the authentication ticket implies that you have authenticated the user already so you shouldn t issue it until the user has actually been authenticated.