Continuous media filesystem services on a real-time JAVA server

We investigate filesystem support for continuous media on the Java language. We describe a prototype implementation on a Real-Time Java Server, developed as an application level server on the Real-Time Mach microkernel environment. The Java virtual machine has been extended to support filesystem bandwidth reservation facilities existing on Real-Time Mach. Such facilities allow continuous media applications to specify their disk bandwidth usage requirements by creating a disk bandwidth reservation. The operating system, upon acceptance of the requests, internally enforces and guarantees such a share of the disk bandwidth for every active reservation. We present a performance evaluation, including both a synthetic application and real multimedia application based on a QuickTime video player which make use of real time Java threads and filesystem bandwidth reservation facilities. Our experiments conclude that the proposed filesystem extensions to the Java language are suitable for continuous media application requirements.