Since the release of the ground-breaking book by the Gang of Four, Erich Gamma, Richard Helm, Ralph Johnson, and John M. The arrangement of code and solution elements is at the heart of software design today, and patterns provide us with ways to simplify and organize these elements-providing the best opportunity to maximize performance, flexibility, and maintainability for applications. Patterns also describe the current industry practice for resolving architectural issues and for handling the design complexity demanded of applications. While improvements in tools and frameworks make it easier to write code more quickly, and modern languages and programming styles make it easier to write better code, the one area that has had the most impact on our ability to create applications over the last 10 to 15 years has been the evolution and increasing acceptance of software design patterns.ĭesign patterns describe common issues that occur repeatedly in application design and development and provide techniques for handling these issues.
Over the years, a number of tried and tested programming and design techniques have evolved, such as componentization, object-orientation, and-more recently-service orientation. The huge increase in complexity of these applications has also forced us to discover ways to simplify and organize the code. In fact, it would be almost impossible to meet the requirements demanded of our modern applications without the continuing growth and evolution of programming languages, operating systems, platform services, and frameworks. And, of course, they must be robust, secure, reliable, and manageable. They must communicate over networks, interact with other applications and services, expose highly interactive and responsive user interfaces, and support rich media and graphics. We expect much more from our modern applications than ever before. However, while creating the code has become much easier, the task of creating applications has not. We take for granted the wealth of tools, high-level languages, runtime frameworks, code libraries, and operating system services that make it possible to build applications quickly and efficiently. Today, by comparison, creating powerful code is easy. Even a simple word processing utility could take several weeks to create as you meticulously planned the memory allocations for variables, wrote routines to perform simple tasks such as drawing characters on the screen and decoding keyboard input, and then typed every individual processor instruction into an assembler. When I began programming home computers more years ago than I care to remember, the only way to make a program run at more than a desultory crawl was to write it using machine code. Writing computer code used to be extremely difficult. Volume 24 Number 05 Patterns and Practices - You Can Depend On Patterns and PracticesĪ Brief History of Dependency at Microsoft
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