By Jörg Kienzle
This publication investigates how transactions should 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 types, and analyzes their suitability for concurrent programming languages. a brand new transaction version named "Open Multithreaded Transactions" is gifted. It offers positive factors for controlling and structuring not just entry to things, as traditional in transaction structures, but additionally threads enjoying transactions. Integration with exception dealing with makes open multithreaded transactions excellent construction blocks for fault-tolerant purposes.
The publication additionally describes the layout of an object-oriented framework delivering the mandatory run-time help for open multithreaded transactions. Procedural, object-oriented and aspect-oriented interfaces for the applying programmer are offered. Programming examples comprise code in Ada, Java and AspectJ.
Read or Download Open Multithreaded Transactions: A Transaction Model for Concurrent Object-Oriented Programming PDF
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Additional info for Open Multithreaded Transactions: A Transaction Model for Concurrent Object-Oriented Programming
Example text
A deadlock is a situation in which a set of processes are in astate from which it is impossible for any of them to proceed. This situation arises if the processes form a circular chain, and each process holds resources that are being requested by the next process in the chain. Different approaches to the deadlock problem can be taken: • One can attempt to prove that deadlocks are not possible in a particular program under investigation. Although difficult, this is c1early the correet approach to take.
G. the object-oriented programming language Eiffel [Mey92], provide more elaborate support for preconditions, postconditions and class invariants. 2 ASPECT -ORIENTATION Aspect-oriented programming (AOP) is the name given to a set of techniques based on the idea that software is better programmed by separately specifying the various concerns (or aspects) , properties, or areas of interest of 10 Open Multithreaded Transaetions a system, and describing their relationships [EAK+02]. Ultimately, the programmer relies on a special language processor called the aspeet weaver to weave (or eompose) the concems together into a coherent program.
The application, however, can instantly start a new transaction and continue working with the transactional objects without having to re-acquire the rights to use them. This request to commit plus the intent to keep going is called Chain Transaction. It is a combination of Comrnit Transaction and Begin_Transaction in one indivisible command. The commitment of the first trans action and the beginning of the next one are wrapped together into one atomic operation. This means in particular that no other transaction can have seen or altered the state of any accessed transactional objects in the mean time.