关键词: 并行Java程序, 异常, 监护模型, 容错能力

Abstract: This paper presents a new guardian model for exception handling in concurrent programs.The model handles exception in asynchronous processes of concurrent Java programs.When exception occurs in concurrent programs，the guardian module has checked the exception and transfer the exception information to all the threads.Based on the exception status and vector clocks，the threads force the events at present rolling back or stopping running to protect concurrent Java programs.Several guardian models have been proposed in the past.These models are based on structuring concurrent programs as atomic actions based on conversations or transactions and resolving multiple concurrent exceptions into a single one.So they have great limitation.The guardian model that we proposed is a global exception handier and every thread can do something according to the status in it.The case study proves the new guardian model for concurrent Java programs is easier used in practice and can efficiently protect concurrent Java programs.

Key words: concurrent Java program, exception, guardian model, fault tolerance