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资源说明：Third approach to EventMachine lightweight concurrency. Runs declared methods and blocks in sequence, each in one tick. So allows calls chaining with keeping the EventMachine multiplexing facility on.
EventMachine Sequencer
======================
**em-sequence** provides third approach to [EventMachine][4] lightweight
concurrency. Runs declared methods and blocks in sequence, each in one
tick. So allows calls chaining with keeping the EventMachine multiplexing
facility on.
See an example. For first, let's define some (of sure, slightly
non-sense) calculator class:
```ruby
class Calculator
def some_method(var, &block)
block.call(1, var)
end
def other_method(x, y, &block)
block.call(x + y)
end
def another_method(z, &block)
block.call(z ** 2)
end
end
```
And then declare and run multiplexed code:
```ruby
EM::run do
EM::Sequence::new(Calculator::new).declare {
# variable declaration
variable :var, 3
# method call declaration
some_method(:var) { [:x, :y] } # | TICK 1
# V
# inline block declaration and definition
block(:x, :y) do |x, y| # | TICK 2
{:x => x + 1, :y => y + 1} # |
end # V
# some other methods
other_method(:x, :y) { :x } # V TICK 3
another_method(:x) # V TICK 4
}.run! do |result| # | TICK 5
puts result.inspect # |
end # V
end
```
It will print out the number `36`. It's the same as linear
non-multiplexed (and non-callbacked calculator):
```ruby
# variable declaration # | TICK 1
calc = Calculator::new # |
var = 3 # |
# |
# method call declaration # |
x, y = calc.some_method(var) # |
# |
# inline block declaration and definition # |
x += 1 # |
y += 1 # |
# |
# some other methods # |
x = calc.other_method(x, y) # |
result = calc.another_method(x) # |
# |
puts result.inspect # V
```
If you don't expect any result, you can simply call:
```ruby
EM::Sequence::run(Calculator::new) do
# some declaration, see above
end
```
Copyright
---------
Copyright © 2011 – 2015 [Martin Poljak][3]. See `LICENSE.txt` for
further details.
[2]: http://github.com/martinkozak/em-sequence/issues
[3]: http://www.martinpoljak.net/
[4]: http://rubyeventmachine.com/
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