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As mentioned previously, the Mail Service provided by Mac OS X Server can be clustered, provided you have shared storage with file-level locking. Currently, the only supported means to implement mail clustering is through Xsan. To set up a cluster, you must first run the Service Configuration Assistant, found by clicking the Change button on the Mail services Clustering tab. Once the assistant fires, you will be presented with the option to create a new cluster or join an existing one, provided that the system detects an available Xsan volume, as shown in Figure 5-41.

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So far, we have been looking at user permissions from the user s perspective. As you have seen, the person who installs your app can exert a great deal of control over the app s behavior. This can lead to serious problems within your app, though. If you require an Internet connection to run, and cannot open that connection, then the app is effectively broken. In older versions of BlackBerry device software, there is no good solution to this problem. The best you can do is detect when a problem has occurred and display an error screen to the user describing what they must do to solve the problem. Some people will be reluctant to modify their device settings, and others might get lost while navigating the menus, and as a result your app stays broken.

Once a cluster is established, it will be stored in a hidden directory, .MailCluster, at the root of the volume. The Mail Service Cluster will be managed by the first host that is added to it. Inside of the .MailCluster folder, you will find a directory named after the name of the Xsan volume, and inside of it reside both configuration files and the mail datastore:

Fortunately, starting with device software version 4.2.1, RIM has offered developers an API that allows insight into the user s current permissions settings. Since you know what resources your app needs to function, you can inspect the current settings and display a message if they are wrong. Even better, you can ask the user to change them. RIM does not allow an app to force its permissions preferences upon the user. This would defeat the whole point of user-controlled permissions, and allow malicious apps a clear shot at whatever they wanted. RIM s solution is fairly elegant: your app can describe the specific permissions it wants, and then the BlackBerry will ask the user to confirm the changes. Of course, the user may decide that she does not want to give you all the permissions you ask for. Your app can examine the permissions again and decide how it wants to proceed. If you simply cannot function, you may exit the app or continue asking for permissions. Otherwise, continue running normally, perhaps warning the user about what degradation she will see. 9-1 shows the permissions that are available to query and change. All are defined in the ApplicationPermissions class.

Notice in the HTML that the href attribute doesn t specify the server guicompanycom or wscompanycom Only the end client knows what the original server identifier is and will call the right server when resolving a URL This gives you the flexibility to move functionality from one server to another without having to update the URLs in the application Looking back at Figure 5-7, the browser client references the server guicompanycom and sends a request /services/trader asking for text/html The server supporting that format generates the content automatically While generating the content, however, the GUIServlet is acting like a mashup A mashup is when you generate content based on content defined elsewhere The GUIServlet consumes a data Web service to generate the GUI Ajax and the GUI Web service consume the same data Web service, making the application data consistent.

Inside of the config folder you will find both standard dovecot and postfix configuration files. The data folder contains the mail store, smtp spool, mailman datastore, and serverside email rules (vacation messages, serverside filters, and sievescripts). Worth mentioning in this folder is the MailClusterConf.plist file, which contains data relevant to the configuration of the mail cluster, including a list of member servers:

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>cluster_name</key>