November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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17.6. Tworzenie i interpretowanie stosu wywołań
Problem
Podczas debugowania programu chcemy zinterpretować stos wywołań związany z wyjątkami w języku Ruby albo zobaczyć ścieżkę, jaką interpreter Ruby przeszedł, aby dotrzeć do określonego wiersza w kodzie.
Rozwiązanie
Aby obejrzeć bieżący stos wywołań interpretera Ruby, można wywołać metodę Kernel#caller. Stos wywołań jest reprezentowany za pomocą listy łańcuchów.
Poniższy program języka Ruby symuluje firmę stosującą styl zarządzania góra-dół: jedna metoda jest delegowana do innej, a ta wywołuje jeszcze inną. Metoda na samym dole może wykorzystać metodę wywołującą w celu podejrzenia znajdujących się wyżej na stosie metod, które ją wywołały:
1 #!/usr/bin/ruby 2 # delegation.rb 3 class ...
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