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When the printer registers with the Jini lookup service it receives a lease Periodically, the printer will need to renew this lease with the lookup service If the printer fails to renew the lease, then when the AR3 An Example 63
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Before the camera can use a Jini technology enabled service, it must first locate the Jini lookup service, just as the print service needed to do to register itself The camera registers itself with a local instance of the Jini technology infrastructure class LookupDiscovery, which will notify the camera of all discovered lookup services
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Finding an appropriate service requires passing a template that is used to match and filter the set of existing services The template specifies both the type of the required service, which is the first filter on possible services, and a set of attributes which is used to reduce the number of matching services if there are several of the right type In this example, the camera supplies a template specifying the printer type and an array of attribute objects The type of each object specifies the attribute type, and its fields specify values to be matched For each attribute, fields that should be matched, such as color printing, are filled in; ones that don't matter are left null The Jini lookup service is passed this template and returns an array of all of the printing services that match it If there are several matching services, the camera may further filter them in this case perhaps to ensure high print resolu tion and present the user with the list of possible printers for choice The final result is a single service object for the printing service At this point the printing service has been selected, and the camera and the printer service communicate directly with each other; the lookup service is no longer involved
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Before printing the image, the user might wish to configure the printer This might be done directly by the camera invoking the service object's configuremethod; this method may display a dialog box on the camera's display with which the user may specify printer settings When the image is printed, the service object sends the configuration information to the printer service
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To print the image, the camera calls the print method of the service object, passing it the image as an argument The service object performs any necessary prepro cessing and sends the image to the printer service to be printed
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If the user wishes to be notified when the image has been printed, the camera needs to register itself with the printer service using the service object The camera might also wish to register to be notified if the printer encounters any errors
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When the printer has finished printing the image or encounters an error, it signals an event to the camera When the camera receives the event, it may notify the user that the image has been printed or that an error has occurred
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