Registering a MIDlet to Be Launched in Java

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1721 Registering a MIDlet to Be Launched
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MIDlet suites must register for push notifications They can register either statically or dynamically Static registration is done by adding attributes to the application descriptor, the JAR manifest, or both It is called static registration because it uses information that is present at installation time Static registrations remain valid until the MIDlet suite is removed from the device Dynamic registration is done with the methods of the PushRegistry class It is called dynamic registration because MIDlets can enable and disable push notifications as needed They can also modify registrations as needed
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If a MIDlet requires a particular connection in order to function correctly and will not need to change that connection while the MIDlet is on the device, the application developer should use static registration Two MIDlet suites on a device cannot use the same connection If two MIDlet suites have a push connection in common, they cannot be on the device at the same time and still function correctly The device checks for connection conflicts at installation If all the static push declarations can be fulfilled, then installation proceeds If not, the user is notified that there are conflicts, and the MIDlet suite is not installed (Refer to 19, "MIDlet Deployment," for connection-conflict errors) The end-user typically uninstalls one MIDlet in order to successfully install the other
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If a MIDlet can be flexible in its push connections, the application developer should use dynamic registration That is,
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173 Listening and Launching
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The Application Management Software (AMS) listens for registered connections and manages the launch of and transition to the appropriate MIDlet It and the other software on the device provide a seamless integration of native and MIDP applications The AMS handles the interactions among incoming connections, interrupting the user, starting and stopping applications, and handing off connections to MIDlets It also enforces the device's security policy and constraints
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For example, if a native application is running when a notification arrives, the AMS must interrupt it It must give the user control over the interruption (for example, user settings determine whether the interruption is to launch the new MIDlet or to get permission to launch it) and any transition to the MIDlet that responds to the network event To make the transition, the AMS stops or pauses the running application It and the other software on the device must work together to make the consumer experience smooth and natural
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The AMS would do similar things if a MIDlet was running when a notification arrives It would call either the pauseApp method or the destroyApp method to change to the MIDlet that responds to the connection The MIDlet life cycle defines the duties of the interrupted MIDlet (Refer to "MIDlet States" on page 82)
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The implementation handles incoming connections in a way that allows them to be held and passed on to the MIDlet when it is started The requirements for buffering of connections and messages are protocol-specific There is a general requirement, though, that if a device buffers data, it must provide the buffered information to the MIDlet The device should supply any buffered data when the launched MIDlet opens the related connection
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When a device supports datagram connections for push notification, it must buffer at least the datagram that caused the startup of the MIDlet It must also guarantee that when it starts a MIDlet in response to the incoming datagram, the buffered data will be available to the MIDlet when the MIDlet opens the UDPDatagramConnection
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The requirement for devices that support socket connections for push notification is different The device must guarantee that when it starts a MIDlet in response to an incoming socket connection, the MIDlet can accept the connection by opening the ServerSocketConnection, provided that the connection has not timed out [ Team LiB ]
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