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,
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.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
Activities and Transactions
Transactional objects also allow access to them by only one client at a time. Synchronization is required to prevent the case in which one client on one thread tries to commit a transaction while another client on a second thread tries to abort it. As a result, every transaction should have a synchronization lock associated with it.
On the other hand, having more than one lock in a given transaction is undesirable—spinning off a new activity for an object that is added to an existing transaction means always paying for the overhead for checking the activity lock before accessing the object. That check is redundant because no two causalities are allowed in the same transaction anyway. In fact, when an object requires a new transaction, it could still reuse the same causality lock of its creator and allow the activity to flow into the new transaction. COM+ therefore enforces the fact that a given transaction can only be part of one activity (note that an activity can still host multiple transactions).
In addition, as discussed in Chapter 4, transactional objects always use JITA (COM+ automatically enables JITA for a transactional object). The use of JITA is only optional for nontransactional objects. Table 5-2 summarizes the synchronization values as a product of the transaction and JITA setting. Note that the only case when a transactional component can start a new activity is when that component is also configured to be the root of a new transaction. ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.