November 2008
Intermediate to advanced
784 pages
23h 28m
English
Content preview from Programming WCF Services, 2nd EditionBecome 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.
Durable Services
Consider the case of a long-running business process or workflow, comprised of multiple execution sequences, that lasts many days or even weeks.
Tip
I use the term workflow to denote a business workflow in general, not one that is necessarily supported by or related to the Windows Workflow Foundation.
Such long-running processes may involve clients (or even end users) that connect to the application, perform a finite amount of work, transition the workflow to a new state, and then disconnect for an indeterminate amount of time before connecting again and continuing to execute the workflow. The clients may at any point also decide to terminate the workflow and start a new one, or the backend service supporting the workflow may end it. Obviously, there is little point in keeping proxies and services in memory waiting for the clients to call. Such an approach will not robustly withstand the test of time; at the very least, timeout issues will inevitably terminate the connection, and there is no easy way to allow machines on both sides to reboot or log off. The need to allow the clients and the services to have independent lifecycles is an important one in a long-running business process, because without it there is no way to enable the clients to connect, perform some work against the workflow, and disconnect. On the host side, over time you may even want to redirect calls between machines.
The solution for long-running services is to avoid keeping the service state in ...
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.