September 2001
Intermediate to advanced
384 pages
11h 59m
English
Content preview from COM & .NET Component ServicesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The COM+ Catalog and Transactions
The COM+ Catalog is a resource manager. When a component that takes part in a transaction tries to access the Catalog, the Catalog auto-enlists in that transaction. As a result, all the configuration changes made within the scope of that transaction will be committed or aborted as one atomic operation, even across multiple catalogs on multiple machines, according to the transaction success. The main advantage of having the COM+ Catalog take part in your transactions is that it enormously simplifies deployment on multiple machines. Imagine a situation in which you write an elaborate installation script that tries to access and install your product on multiple machines. The problem is that almost anything in a distributed installation scenario can go wrong—from network failures to security to disk space. Because all the installation attempts are scoped under one transaction, you can guarantee that all server machines are left with identical configurations—either the installation succeeded on all of them, or the changes were rolled back and the servers are left just as they were before you tried to install the product.
Another benefit of having the Catalog as a resource manager is dealing with potential contentions and conflicts between two different applications that try to access and modify the Catalog at the same time. To ensure the transaction’s isolation, when one transaction makes a change to the Catalog, the Catalog will block all writers from ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.