By Jörg Kienzle
This ebook investigates how transactions will be built-in with concurrent object-oriented programming, and the way transactions might be made on hand to an software programmer on the programming language point.
The booklet supplies an in depth evaluation of current transaction versions, and analyzes their suitability for concurrent programming languages. a brand new transaction version named "Open Multithreaded Transactions" is gifted. It offers gains for controlling and structuring not just entry to things, as traditional in transaction structures, but additionally threads playing transactions. Integration with exception dealing with makes open multithreaded transactions excellent construction blocks for fault-tolerant functions.
The ebook additionally describes the layout of an object-oriented framework supplying the required run-time aid for open multithreaded transactions. Procedural, object-oriented and aspect-oriented interfaces for the appliance programmer are awarded. Programming examples contain code in Ada, Java and AspectJ.
Read Online or Download Open Multithreaded Transactions: A Transaction Model for Concurrent Object-Oriented Programming PDF
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Extra resources for Open Multithreaded Transactions: A Transaction Model for Concurrent Object-Oriented Programming
External exceptions allow programmers to pass in a disciplined, unified and structured fashion different operation outcomes to the containing context. They can be used to inform the higher level context of the reasons for abnormal behavior, and of the state in which the lower level context has been left. The latter is very important, for it makes eITor recovery at the higher level context possible. Some systems provide an automatic support wh ich guarantees "all-ornothing" semantics: if an exception is propagated outside a context, all modifications made inside the context are cancelled.
This chapter presents a survey of transaction and atomic action models and analyzes their suitability for concurrent object-oriented programming languages and their integration with exception handling. 2 COMPETITIVE WORLD: 1RANSACTIONS AND DERIVATIVES Transactions [GR93] are a classic software structure for managing concurrent accesses to global data and for maintaining data consistency in the presence of failures. The notion of transaction has first been introduced in database systems in order to correctly handle concurrent updates of data and to provide fault tolerance with respect to hardware failures [GR93].
In order to reduce the complexity of concurrent systems, exception contexts should encapsulate complex behavior consisting of several operations on several objects. Some researchers have realized the benefits of integrating exception handling and concurrency. The language Facile [TLP+93], an extension of SML, allows the application programmer to dec1are the same exception in several processes; when the exception is raised in any one of them, the execution of all processes wh ich dec1ared this exception is interrupted and the corresponding handlers are called.