Tutorial for the Java Context Awareness Framework (JCAF)
This tutorial contains basic information on how to run and program JCAF version 1.5. The theoretical thoughts behind JCAF is described in the PERVASIVE 2005 paper [3]. More technical details of the design of JCAF is described in the technical report on JCAF [1]. Please read these documents as a background for this tutorial. JCAF has been used to implement different context-aware applications and architectures [5, 2, 4]. JCAF version 1.5 is build on Java 1.4. JCAF relies on Java RMI for its distribution. Therefore, knowlegde and programming experience in Java RMI is needed before using JCAF.
Under normal circumstances, the JCAF ContextService should be able to dynamically load new classes on runtime without restarting the service. This is part of the standard dynamic classloading in Java using the codebase property. For some unknown reason, however, I have not been able to make this work in connection with JCAF. Therefore, in order to deploy and load you own classes – like your own implementations of new kinds of entities and context items – you need to add these classes to the classpath of the Context Service. The most convinient way to do this is to make a jar file, place it in the deploy directory, and add this jar file to the classpath property in the startup script (ContextService or ContextService.bat) before restarting the context service. This is done by the jcaf.examples.jar file.
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