Gain insights into how behaviour is being invoked and avoid common pitfalls through Call Graph Diagrams.

1. FUTURE MEDIA LAB
ENGINEERING
LIGHTNING
TALKS

2. James Moriarty
Call Graphs

3. The “Call”
class A
def self.z
B.y
end
end
class B
def self.y
puts "hello world"
end
end
A.z # => "hello world"
“message passing is a
technique for invoking
behavior”
A -- y -> B
● A is the sender
● B is the receiver
● y is the message

4. The “Graph”
“a set of vertices and edges”

5. The “Call Graph”
class A
def self.x
B.new.y
end
end
class B
def y
1 + C.z do 1 end
end
end
class C
def self.z
yield
end
end

6. Things to look for

7. Universal Vertices

8. Directed Cyclic Graphs

9. Directed Acyclic Graphs
module Poto
module FileRepository
module AWS
class S3
def all(prefix:, page:, per_page:)
objects = client.objects(
page: page,
per_page: per_page,
prefix: prefix
)
FileCollectionMapper.new(objects).call
end
end
end
end
end

10. github.com/jamesmoriarty/call-graph