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See the latest about a temporary release delay on new titles. Learn more. Larry O'Brien: The year is Forrest Gump rules the box office, the Republicans take control of the legislature, and Britney Spears is just another Mouseketeer… What is happening in the software development world?
What are people talking about and struggling with? There was none of the dynamic content we take for granted today, no meaningful search mechanisms, and very few companies had any idea how to use this new fangled thing. Waterfall vs. My personal computer at the time, by the way, was a PowerMac with a whopping 16Mb main memory. In all, it was a really fun time to be in software, for so much was in motion and there was so much possibility.
Not unlike, I should add, today. Although we are in a period of economic scarcity, this is still very much a time of software abundance, with still so much in motion and still so much possibility. What did Design Patterns bring to the table that caused it to be received so well? Grady: I have always described the history of software development as one of growing levels of abstraction, which we see manifest in our languages, our methods, our processes, our platforms. Design patterns were the next now obvious steps along that path.
Kent Beck and I had sponsored a retreat in the summer of to bring together folks interested in this space this was the genesis of the Hillside Group and I knew then that being able to name societies of classes that collaborated was the Right Thing. Are there aspects of that language or programming system that you wish had a higher profile today? Grady: You may be surprised to know that Ada is still alive; I'm actually engaged on a satellite project that's producing about a half million lines of new Ada which is not uncommon for such satellite systems.
In retrospect, Ada was ahead of its time, with packaging, generics, exception handling, and its tasking mechanisms—elements that continue to be show up in contemporary practices. Given that the frequency scaling wars are over, we see the shift to multicore Is this a change in practice e. Grady: I think the change you see is because the notion of a class as a fundamental abstraction is so fully a part of the DNA of contemporary development that it's just taken for granted.
The fundaments of building crisp abstractions with clear separations of concern and a balanced distribution of responsibilities is as much an issue today as it was then. Grady: The technology elements of their platform are established, but not their architecture.
This is not unlike saying that an artist who works in clay has their domain fully architected just as much as an artist who works in oils. What you say is mostly true about developing in the domain of the Web, but there's a whole lot of architecture yet to be done Those things you mention are just the context within which one architects. In fact, this is a good thing. An artist or a writer faced with a completely blank slate is often less innovative then one who is somehow constrained.
It just so happens that the Web has come together so serendipitously that we have a veritable rich primordial soup of stuff from which new life forms are still appearing.
What sorts of architectural questions do these "opinionated" frameworks leave open? Grady: Those things are just part of the plumbing Larry: One view holds that diagrams should be very semantically meaningful: that one ought to be able to look at, say, whether a diamond is filled and know something very precise about the code.
Grady: I just spoke of this very notion at the Models conference. When Jim, Ivar, and I began our journey that became manifest in the UML, we never intended it to become a programming language. I think that there's a fairly narrow domain for which model-driven development makes sense and Ericsson is the classic example of value, for they use the UML deeply in the creation of all their cell base station equipment but that we should return to the roots of the UML, which was to be a language for visualizing, specifying, constructing, and documenting the artifacts of a software-intensive system—in short, a graphical language to help reason about the design of a system as it unfolds.
Most diagrams should be thrown away, but there are a few that should be preserved, and in all, one should only use a graphical notation for those things that cannot easily be reasoned about in code.
As I've also often said, the code is the truth, but it is not the whole truth, and there are things such as rationale, cross-cutting concerns, and patterns that cannot easily be recovered or seen from code These are the things for which a graphical notation adds value, and any such notation should be used only if it has predictive power or reasoning power meaning, you can ask questions about it.
Larry: The idea of a repository that can express a programmatic idea in a diagram or in compilable text is an old idea: Rational was working on it more than a decade ago. Have you seen that product and have a reaction to it?
Actually, I've interacted with Charles since he formed Intentional and as an aside, conducted an oral history of Charles for the Computer History Museum. I think he's got some innovative ideas. Spolsky seems to represent a real constituency that is not just dismissive but outright hostile to software development approaches that are not code-centric.
Grady: You may be surprised to hear that I'm firmly in Joel's camp. The most important artifact any development team produces is raw, running, naked code. Everything else is secondary or tertiary. However, that is not to say that these other things are inconsequential.
Rather, our models, our processes, our design patterns help one to build the right thing at the right time for the right stakeholders. Yet, while code is king, one must realize that it is also a servant, for it in the end must serve some constituency, deliver some measurable value. Just as I loathe architecture astronauts—people who have no skin in the game, people who are so divorced from the reality of executables that they melt in the sight of a line of code—I also loathe code bigots who are so blinded by their own prowess and tools that they lose sight of why or for whom they are toiling.
Design for design's sake is meaningless; code for code's sake may be fun but it is also meaningless. Recognize also that there are very real tensions between doing the right thing in the short term and doing the right thing for the long term.
Code centricity tends to draw you to the former; architectual centricity tends to draw you to the latter, and honestly, neither pole is correct, but rather it is the dance between the two for which a particular team with a specific culture working in a given domain must find balance. Larry: How big a deal for software development is the manycore era? Will it change the way we approach architecture and design? Grady: I've said this before often as well: the average developer is not well-prepared to develop concurrent, distributed, secure software.
These are all really wicked problems. Our languages have few really good primitives for dealing with intimate concurrency such as multicore processors demand, and thus we've got a bit of a conundrum.
My take is that we need advances in languages, in compilers, in patterns such as Intel's concurrency patterns and platforms such as Apple's Grand Central Dispatch to raise the level of abstraction. Larry: What programming languages and technologies are you enjoying right now? Eclipse is my development platform of choice. See All Related Store Items. Page 1 of 1. Larry O'Brien talks to Grady Booch about the 15th anniversary of Design Patterns , the wicked problems of developing in the multicore era, what programming languages he's using now, and the best coffee.
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See the latest about a temporary release delay on new titles. Learn more. Larry O'Brien: The year is Forrest Gump rules the box office, the Republicans take control of the legislature, and Britney Spears is just another Mouseketeer… What is happening in the software development world? What are people talking about and struggling with? There was none of the dynamic content we take for granted today, no meaningful search mechanisms, and very few companies had any idea how to use this new fangled thing. Waterfall vs.
Grady Booch on Design Patterns, OOP, and Coffee
He is recognized internationally for his innovative work in software architecture, software engineering, and collaborative development environments. Booch earned his bachelor's degree in from the United States Air Force Academy and a master's degree in electrical engineering in from the University of California, Santa Barbara. Booch served as Chief Scientist of Rational Software Corporation since its founding in and through its acquisition by IBM in , where he kept working until March Booch has devoted his life's work to improving the art and the science of software development. In the s, he wrote one of the more popular books on programming in Ada.
OOAD - Object Oriented Paradigm
The object-oriented paradigm took its shape from the initial concept of a new programming approach, while the interest in design and analysis methods came much later. The first object—oriented language was Simula Simulation of real systems that was developed in by researchers at the Norwegian Computing Center. In the s, Grady Booch published a paper titled Object Oriented Design that mainly presented a design for the programming language, Ada. In the ensuing editions, he extended his ideas to a complete object—oriented design method. The main difference between object-oriented analysis and other forms of analysis is that in object-oriented approach, requirements are organized around objects, which integrate both data and functions. They are modelled after real-world objects that the system interacts with. In traditional analysis methodologies, the two aspects - functions and data - are considered separately.
Object-Oriented Analysis and Design with Applications, Third Edition