Abstract
This paper discusses the implementation of a distributed execution environment, DJO, which supports the use of shared Java objects for parallel and distributed applications and provides the Java programmer with the illusion of a network-wide shared object space on loosely coupled distributed systems. DJO supports shared objects through an implementation of multiple reader/single writer write-invalidate DSM protocol in software, providing the shared memory abstraction at object granularity. Object distribution and sharing are implemented through the replication mechanism, transparently to application. The system enforces mutual consistency among replicas of an object. The main benefits of DJO are enhanced availability and performance due to the replicated object model and easier application design, as the underlying software takes care of distribution and memory consistency issues.
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