Distributed Event Processing With Java Shared Object Spaces

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Distributed Event Processing With Java Shared
Object Spaces
Shared Object Space
Shared Event Space

• Basic Idea
• System is set of distributed software components
• Shared object space holds distributed state
• Shared event space for distributed coordination
• Events refer to shared objects
• Analyze program to understand object referencing
• Optimizations
• Find and exploit point-to-point interactions
• Optimizations for objects shared only by
  colocated components
• Improved failure handling
• Transactions to ensure state remains consistent
• Combine object and event delivery to minimize
  windows of vulnerability to failures

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Components

• Impact
• Clean but powerful programming model
• Shared object space enables easy sharing of data
  between components, supports quick
  reconfiguration of system
• Shared event space supports large variety of
  communication patterns, enables rapid integration
  of new components
• Our technology provides needed analyses and
  transformations
• Replaces general abstractions (good for
  programmer) with specialized efficient
  implementations (good for system)
• Gives insight into communication and interaction
  patterns

• Accomplishments and Status
• System implementation in MIT Flex compiler system
• Transaction system design and implementation
  underway
• Event system design underway
• Object referencing analyses in design and
  implementation
• Basic pointer and escape analysis prototype
• Advanced design-based analysis under development

Martin Rinard, Daniel Jackson, MIT Laboratory for
Computer Science