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6. Outlook
The development of the transactional programming model is a truly remarkable phenomenon, and one that we can learn a great deal from analyzing. First and foremost, it is an unprecedented industrial success, because it is the programming model for information systems, i.e. it concerns 80 to 90% of the population of all programmers. Transactional program execution environments have been the commercial spearhead of all computer manufacturers. These environments have had a profound influence on the structure of the underlying operating systems: the thread concept — of UNIX — is a direct result.
From a software engineering perspective, it's an exemplary illustration of the old adage "the function creates the tool". Publishers of tools and methods have often succumbed to the opposite temptation, which of course has systematically resulted in failure and frustration due...
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Outlook
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Product range
Transactional manufacturers
Most computer manufacturers offer transactional systems (for complete and up-to-date information, please refer to the individual product descriptions).
IBM offers several transactional environments. The oldest is IMS (Information Management System). This is the reference transactional environment for very large IBM systems.
The more recent...
Standardization
The de facto standard for cooperative transaction protocols is IBM's APPC (Advanced Program to Program Communication) protocol.
OSI has standardized a cooperative transaction protocol equivalent to APPC under the name OSI/TP, which is built on the OSI session, whereas APPC is built on IBM's SNA session. Applications using APPC are portable to OSI/TP.
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