dispatio
A stupid dispatch table tool.
require 'dispatio'
class MyClass
def consume(type, msg)
(@ctable ||= Dispatio.make_table(self, 'consume_').call(type, msg)
# or
#(@ctable ||= Dispatio.make_table(self, prefix: 'consume_').call(type, msg)
end
def post(type, msg)
(@ptable ||= Dispatio.make_table(self, '_post').call(type, msg)
# or, more explicitely
#(@ptable ||= Dispatio.make_table(self, suffix: '_post').call(type, msg)
end
protected
def consume_this(msg)
# ...
end
def consume_that(msg)
# ...
end
def this_post(msg)
# ...
end
def that_post(msg)
# ...
end
endThe Dispatio.make_table(klass, prefix_or_opts) creates a dispatch table by enumerating the matching (prefix or suffix) methods. One can then call (or dispatch) the table to call the corresponding method.
against an instance
require 'dispatio'
class Foo
def consume(name, data)
dtable.dispatch(name, data) # or
#dtable.call(name, data) #
#dtable.(name, data) #
#dtable[name].call(data) # or
#dtable[name].(data) #
#dtable[name][data] #
#
# just use the one you like
end
protected
def validate_foo(data)
[ self.class, :vfoo, data ]
end
def validate_bar(data)
[ self.class, :vbar, data ]
end
def dtable; @dtable ||= Dispatio.make_table(self, 'validate_'); end
# or
#def dtable; @dtable ||= Dispatio.make_table(self, prefix: 'validate_'); end
end
foo = Foo.new
foo.consume(:foo, 'hello') # ==> [ Foo, :vfoo, 'hello' ]
foo.consume(:bar, 'world') # ==> [ Foo, :vbar, 'world' ]
foo.consume('foo', 'hello') # ==> [ Foo, :vfoo, 'hello' ]
foo.consume('bar', 'world') # ==> [ Foo, :vbar, 'world' ]
foo.consume(:nada, 'nemo') # ==> NoMethodError, 'no :validate_nada method'against a singleton class
require 'dispatio'
class Bar
class << self
def consume(name, data)
dtable.dispatch(name, data) # or
#dtable.call(name, data) #
#dtable.(name, data) #
#dtable[name].call(data) # or
#dtable[name].(data) #
#dtable[name][data] #
#
# just use the one you like
end
protected
def validate_foo(data)
[ self, :vfoo, data ]
end
def validate_bar(data)
[ self, :vbar, data ]
end
def dtable; @dtable ||= Dispatio.make_table(self, 'validate_'); end
# or
#def dtable; @dtable ||= Dispatio.make_table(self, prefix: 'validate_'); end
end
end
Bar.consume(:foo, 'hello') # ==> [ Bar, :vfoo, 'hello' ]
Bar.consume(:bar, 'world') # ==> [ Bar, :vbar, 'world' ]
Bar.consume('foo', 'hello') # ==> [ Bar, :vfoo, 'hello' ]
Bar.consume('bar', 'world') # ==> [ Bar, :vbar, 'world' ]
Bar.consume(:nada, 'nemo') # ==> NoMethodError, 'no :validate_nada method'LICENSE
MIT, see LICENSE.txt