January 2013
Intermediate to advanced
384 pages
9h 54m
English
Content preview from Pattern-Oriented Software Architecture For DummiesBecome 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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Solution: Use a Broker
Structure distributed systems so that the components communicate via remote service invocation. A broker component coordinates communication of requests from client to server and also coordinates returning the results from server to client.
Looking inside a broker system
Three main components are involved in a broker system: the broker, the server, and the client. Figure 12-7 shows a simple class diagram.
Figure 12-7: A broker system at its simplest.
In addition to these components, a broker system features proxies and bridges. I describe all these elements in the following sections.
The broker
The broker is the message-routing component of your system. It passes messages from client to server and from server to client. These messages are requests for services and replies to those requests, as well as messages about exceptions that have occurred. The requests are coded as calls to the broker's API. The broker is responsible for error handling in response to these exception reports.
Figure 12-8 shows the Class-Responsibility-Collaborator (CRC) card for the broker. (I introduce CRC cards in Chapter 2.)
Figure 12-8: The broker CRC card.
The broker must be able to locate the servers to which it sends requests, so it maintains a registry of the servers and their ...
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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.
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.