different kinds of program

• programming with different carvings of the system

• allows clean separation of:

  • programming of functionality
  • programming of control over emergent entities

class Library {

Hashtable books;

Library() {

books=new Hashtable(10);

}

.

.

}

portal Printer {

void print(Book book) {

book: Book: {direct pages;}

}

}

coordinator User, Library {

mutex {checkOut, checkIn};

}

www.parc.xerox.com/aop

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