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define_method_handler's Introduction
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define_method_handler's Issues
enable_handler_group without block
Anonymous, of easy creation and inherited chains
class X
define_method_handler(:foo) { |a|
a == 4 ? 3 : ignore
}
end
chain = define_chain(X).handler(:foo){|a|
if a == 3
a+1
else
ignore
end
}.handler(:foo){|a|
chain.foo(a-1)
}.new
define_chain should return an anonymous class
Ignore and value to allow define conditions only in the chain
class X
define_method_handler(foo) do |a|
if a == 3
value a+1
else
ignore # process the next link
end
end
end
Allow define normal methods as method handlers
Self reference on condition
Nested groups, method handlers with multiple groups
class Chain
handler_scope(:group => :a) do
handler_scope(:group => :b) do
define_method_handler(:foo) do
99
end
end
end
end
chain = Chain.new
chain.disable_handler_group(:a) do
chain.foo # nil
end
chain.disable_handler_group(:b) do
chain.foo # nil
end
chain.disable_handler_group(:default) do
chain.foo # nil
end
Method handler inheritance on classes
disable_handler_group without block
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