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Joe Armstrong write everything yourself. The thing that really hasn t worked is software reuse. It s appallingly bad. Seibel: Yet you re the architect not only of Erlang but of an application framework, the Open Telecom Platform. Is it reusable Armstrong: To an extent it s reusable. But the same problem will occur. If that framework exactly solves your problem if some programmer who doesn t know anything about the design criteria for OTP looks at it in a few years time and says, Oh, that s great; that s exactly what I want to do, then it s fine and you get this measure of reusability. If it s not, then you have a problem. Fairly recently I ve seen people say, This is really kind of artificial, we re twisting the code to fit into this OTP framework. So I say, Well, rewrite the OTP framework. They don t feel they can change the framework. But the framework s just another program. It s really rather easy. And I go into it and then it does what they want. They look at it and they say, Yeah, well, that s easy. They accept that it s easy. But they say, Well, our project management doesn t want us messing around with the framework. Well, give it a different name then or something. Seibel: But do you think it s really feasible to really open up all those black boxes, look inside, see how they work, and decide how to tweak them to one s own needs Armstrong: Over the years I ve kind of made a generic mistake and the generic mistake is to not open the black box. To mentally think, this black box is so impenetrable and so difficult that I won t open it. I ve opened up one or two black boxes: I wanted to do a windowing system, a graphics system for Erlang, and I thought, Well, let s run this on X Windows. What is X Windows It s a socket with a protocol on top of it. So you just open the socket and squirt these messages down it. Why do you need libraries Erlang is message based. The whole idea is you send messages to things and they do things. Well, that s the idea in X Windows you ve got a window, send it a message, it does something. If you do something in the window it sends you a message back. So that s very much like Erlang. The way of programming X Windows, however, is through callback libraries this happens and call this. That s not the Erlang way of thinking. The Erlang way
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Joe Armstrong of thinking is, send a message to something and do something. So, hang on, let s get rid of all these libraries in between let s talk directly to the socket. And guess what It s really easy. The X protocol s got, I don t know, 100 messages, 80 messages or something. Turns out you only need about 20 of them to do anything useful. And these 20 messages you just map onto Erlang terms and do a little bit of magic and then you can start sending messages to windows directly and they do things. And it s efficient as well. It s not very pretty because I haven t put much effort into graphics and artistic criteria there s a lot of work there to make it look beautiful. But it s not actually difficult. Another one is this typesetting system I did where the abstraction boundary I opened up is Postscript. As you get to that boundary you think, I don t want to go through the boundary, because what s underneath is you imagine enormously complicated. But again, it turns out to be very easy. It s a programming language. It s a good programming language. The abstraction boundary is easy to go through and once you ve gone through, there s a lot of benefit. For my Erlang book, my publisher said, We ve got tools to make diagrams. But the thing I don t like about diagramming tools is it s really difficult to get an arrow to meet exactly. And your hand hurts. I thought, The amount of time to write a program that spits out Postscript and then say, I want a circle there and the arrow goes exactly there, and get the program right, isn t long. It takes a few hours. Doing diagrams with programs takes about the same time as doing them in a WYSIWYG thing. Only there are two benefits. Your hand doesn t hurt at the end and even when you blow the thing up to a magnification of 10,000, the arrow points exactly right. I can t say beginner programmers should open up all these abstractions. But what I am saying is you should certainly consider the possibility of opening them. Not completely reject the idea. It s worthwhile seeing if the direct route is quicker than the packaged route. In general I think if you buy software, or if you use other people s software, you have to reckon with an extremely long time to tailor it it doesn t do exactly what you want, it does something subtly different. And that difference can take a very long time to solve.
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