November 2002
Intermediate to advanced
560 pages
16h 4m
English
Content preview from Patterns of Enterprise Application Architecture
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Chapter 18. Base Patterns
Gateway
An object that encapsulates access to an external system or resource.
Interesting software rarely lives in isolation. Even the purest object-oriented system often has to deal with things that aren’t objects, such as relational database tables, CICS transactions, and XML data structures.
When accessing external resources like this, you’ll usually get APIs for them. However, these APIs are naturally going to be somewhat complicated because they take the nature of the resource into account. Anyone who needs to understand a resource needs to understand its API—whether JDBC and SQL for relational databases or W3C ...
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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.