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DistributionCapabilities.PDF
J-Orchestra: Enhancing Java Programs with
Distribution Capabilities
ELI TILEVICH
Virginia Tech
and
YANNIS SMARAGDAKIS
University of Oregon
J-Orchestra is a system that enhances centralized Java programs with distribution capabilities.
Operating at the bytecode level, J-Orchestra transforms a centralized Java program (i.e., running
on a single Java Virtual Machine (JVM)) into a distributed one (i.e., running across multiple
JVMs). This transformation effectively separates distribution concerns from the core functionality
of a program. J-Orchestra follows a semi-automatic transformation process. Through a GUI,
the user selects program elements (at class granularity) and assigns them to network locations.
Based on the user’s input, the J-Orchestra backend automatically partitions the program through
compiler-level techniques, without changes to the JVM or to the Java Runtime Environment
(JRE) classes. By means of bytecode engineering and code generation, J-Orchestra substitutes
method calls with remote method calls, direct object references with proxy references, etc. It also
translates Java language features (e.g., static methods and fields, inheritance, inner classes, new
object construction, etc.) for efficient distributed execution.
We detail the main technical issues that J-Orchestra addresses, including its mechanism for
program transformation in the presence of unmodifiable code (e.g., in JRE classes) and the trans-
lation of concurrency and synchronization constructs to work correctly over the network. We
further discuss a case study of transforming a large, commercial, third-party application for ef-
ficient execution in a client server environment and outline the architectural characteristics of
centralized programs that are amenable to automated distribution with J-Orchestra.
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