Design and Evaluation of an Extensible Web and Telephony Server based on the J-Kernel
Spoonhower, Daniel; Czajkowski, Grzegorz; Hawblitzel, Chris; Chang, Chi-Chao; Hu, Deyu; von Eicken, Thorsten
This paper describes the design and performance of the J-Server, an integrated web and telephony server that allows untrusted Java servlets to be dynamically uploaded to extend the server's functionality. The J-Kernel provides for protection and communication between J-Server servlets, and ensures that servlets can be cleanly terminated. A resource monitor called JRes is used to account for servlet resource usage. Two sample applications show that the overhead of J-Kernel task boundary crossings is small compared to the applications' overall running time. Experience developing applications for the J-Server demonstrates the benefits of extensible systems based on safe language protection, and the flexibility of the servlet model.
computer science; technical report
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