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RSpec.describe 'Concurrent' do
describe 'Promises::Channel', edge: true do
specify "#capacity" do
channel = Concurrent::Promises::Channel.new 2
expect(channel.capacity).to be 2
end
specify "#to_s" do
channel = Concurrent::Promises::Channel.new
expect(channel.to_s).to match(/Channel.*unlimited/)
channel = Concurrent::Promises::Channel.new 2
expect(channel.to_s).to match(/Channel.*0.*2/)
channel.push :value
expect(channel.to_s).to match(/Channel.*1.*2/)
end
specify "#(try_)push(_op)" do
channel = Concurrent::Promises::Channel.new 1
expect(channel.size).to eq 0
expect(channel.try_push(:v1)).to be_truthy
expect(channel.size).to eq 1
expect(channel.try_push(:v2)).to be_falsey
expect(channel.size).to eq 1
channel = Concurrent::Promises::Channel.new 1
expect(channel.push(:v1)).to eq channel
expect(channel.size).to eq 1
thread = in_thread { channel.push :v2 }
is_sleeping thread
expect(channel.size).to eq 1
channel.pop
expect(channel.size).to eq 1
expect(thread.value).to eq channel
channel.pop
expect(channel.size).to eq 0
channel = Concurrent::Promises::Channel.new 1
expect(channel.push(:v1)).to eq channel
expect(channel.size).to eq 1
thread = in_thread { channel.push :v2, 0.01 }
is_sleeping thread
expect(channel.size).to eq 1
expect(thread.value).to eq false
channel.pop
expect(channel.size).to eq 0
expect(channel.push(:v3, 0)).to eq true
expect(channel.size).to eq 1
thread = in_thread { channel.push :v2, 1 }
is_sleeping thread
channel.pop
expect(channel.size).to eq 1
expect(thread.value).to eq true
channel = Concurrent::Promises::Channel.new 1
expect(channel.push_op(:v1).value!).to eq channel
expect(channel.size).to eq 1
push_op = channel.push_op :v2
expect(channel.size).to eq 1
expect(push_op.pending?).to be_truthy
channel.pop
expect(channel.size).to eq 1
expect(push_op.value!).to eq channel
channel.pop
expect(channel.size).to eq 0
end
specify "#(try_)pop(_op)" do
channel = Concurrent::Promises::Channel.new 1
channel.push :v1
expect(channel.size).to eq 1
expect(channel.try_pop).to eq :v1
expect(channel.size).to eq 0
expect(channel.try_pop).to eq nil
expect(channel.size).to eq 0
channel = Concurrent::Promises::Channel.new 1
channel.push :v1
expect(channel.pop).to eq :v1
expect(channel.size).to eq 0
thread = in_thread { channel.pop }
is_sleeping thread
expect(channel.size).to eq 0
channel.push :v2
expect(thread.value).to eq :v2
expect(channel.size).to eq 0
channel = Concurrent::Promises::Channel.new 1
channel.push :v1
expect(channel.pop).to eq :v1
expect(channel.size).to eq 0
thread = in_thread { channel.pop 0.01 }
is_sleeping thread
expect(channel.size).to eq 0
expect(thread.value).to eq nil
channel.push :v2
expect(channel.size).to eq 1
expect(channel.pop).to eq :v2
expect(channel.size).to eq 0
thread = in_thread { channel.pop 1 }
is_sleeping thread
channel.push :v3
expect(channel.size).to eq 0
expect(thread.value).to eq :v3
channel.push :v4
expect(channel.pop(0)).to eq :v4
channel = Concurrent::Promises::Channel.new 1
channel.push :v1
expect(channel.pop_op.value!).to eq :v1
expect(channel.size).to eq 0
pop_op = channel.pop_op
expect(channel.size).to eq 0
expect(pop_op.pending?).to be_truthy
channel.push :v2
expect(channel.size).to eq 0
expect(pop_op.value!).to eq :v2
end
specify "#(try_)pop(_op)_matching" do
channel = Concurrent::Promises::Channel.new 2
channel.push 'junk'
channel.push :v1
expect(channel.size).to eq 2
expect(channel.try_pop_matching(Symbol)).to eq :v1
expect(channel.size).to eq 1
expect(channel.try_pop_matching(Symbol)).to eq nil
expect(channel.size).to eq 1
channel = Concurrent::Promises::Channel.new 2
channel.push 'junk'
channel.push :v1
expect(channel.pop_matching(Symbol)).to eq :v1
expect(channel.size).to eq 1
thread = in_thread { channel.pop_matching(Symbol) }
is_sleeping thread
expect(channel.size).to eq 1
channel.push 'junk'
channel.pop
channel.push :v2
expect(thread.value).to eq :v2
expect(channel.size).to eq 1
channel = Concurrent::Promises::Channel.new 2
channel.push 'junk'
channel.push :v1
expect(channel.pop_matching(Symbol)).to eq :v1
expect(channel.size).to eq 1
thread = in_thread { channel.pop_matching(Symbol, 0.01) }
is_sleeping thread
expect(channel.size).to eq 1
expect(thread.value).to eq nil
channel.push :v2
expect(channel.size).to eq 2
expect(channel.pop_matching(Symbol)).to eq :v2
expect(channel.size).to eq 1
thread = in_thread { channel.pop_matching(Symbol,1) }
is_sleeping thread
channel.push :v3
expect(channel.size).to eq 1
expect(thread.value).to eq :v3
channel.push :v4
expect(channel.pop_matching(Symbol,0)).to eq :v4
channel = Concurrent::Promises::Channel.new 2
channel.push 'junk'
channel.push :v1
expect(channel.pop_op_matching(Symbol).value!).to eq :v1
expect(channel.size).to eq 1
pop_op = channel.pop_op_matching(Symbol)
expect(channel.size).to eq 1
expect(pop_op.pending?).to be_truthy
channel.push :v2
expect(channel.size).to eq 1
expect(pop_op.value!).to eq :v2
end
specify "#(try_)select(_op)" do
channel1 = Concurrent::Promises::Channel.new 1
channel2 = Concurrent::Promises::Channel.new 1
expect(channel1.try_select(channel2)).to eq nil
expect(Concurrent::Promises::Channel.try_select([channel1, channel2])).to eq nil
channel1.push :v1
expect(channel1.try_select(channel2)).to eq [channel1, :v1]
expect(channel1.size).to eq 0
expect(channel2.size).to eq 0
channel1 = Concurrent::Promises::Channel.new 1
channel2 = Concurrent::Promises::Channel.new 1
channel1.push :v1
expect(Concurrent::Promises::Channel.select([channel1, channel2])).to eq [channel1, :v1]
channel1.push :v1
expect(channel1.select(channel2)).to eq [channel1, :v1]
expect(channel1.size).to eq 0
expect(channel2.size).to eq 0
thread = in_thread { channel1.select(channel2) }
is_sleeping thread
expect(channel1.size).to eq 0
channel2.push :v2
expect(thread.value).to eq [channel2, :v2]
expect(channel1.size).to eq 0
expect(channel2.size).to eq 0
channel1 = Concurrent::Promises::Channel.new 1
channel2 = Concurrent::Promises::Channel.new 1
channel1.push :v1
expect(channel1.select(channel2)).to eq [channel1, :v1]
expect(channel1.size).to eq 0
expect(channel2.size).to eq 0
thread = in_thread { channel1.select(channel2, 0.01) }
is_sleeping thread
expect(channel1.size).to eq 0
expect(channel2.size).to eq 0
expect(thread.value).to eq nil
channel2.push :v2
expect(channel1.size).to eq 0
expect(channel2.size).to eq 1
expect(channel2.select(channel1)).to eq [channel2, :v2]
expect(channel1.size).to eq 0
expect(channel2.size).to eq 0
channel1 = Concurrent::Promises::Channel.new 1
channel2 = Concurrent::Promises::Channel.new 1
channel1.push :v1
expect(channel1.select_op(channel2).value!).to eq [channel1, :v1]
channel1.push :v1
expect(Concurrent::Promises::Channel.select_op([channel1, channel2]).value!).to eq [channel1, :v1]
expect(channel1.size).to eq 0
expect(channel2.size).to eq 0
select_op = channel2.select_op(channel1)
expect(channel1.size).to eq 0
expect(channel2.size).to eq 0
expect(select_op.pending?).to be_truthy
channel2.push :v2
expect(channel1.size).to eq 0
expect(channel2.size).to eq 0
expect(select_op.value!).to eq [channel2, :v2]
end
def push_first(push_type, pop_type)
channel = Concurrent::Promises::Channel.new 0
message = Object.new
case push_type
when :push
thread = in_thread { channel.push message }
is_sleeping thread
when :push_op
push = channel.push_op message
expect(push.pending?).to eq true
else
raise
end
expect(channel.size).to eq 0
case pop_type
when :try_pop
expect(channel.try_pop).to eq message
when :pop
expect(channel.pop).to eq message
when :pop_op
expect(channel.pop_op.value!).to eq message
else
raise
end
expect(channel.size).to eq 0
case push_type
when :push
expect(thread.value).to eq channel
when :push_op
expect(push.value!).to eq channel
else
raise
end
end
def pop_first(pop_type, push_type)
channel = Concurrent::Promises::Channel.new 0
message = Object.new
case pop_type
when :pop
thread = in_thread { channel.pop }
is_sleeping thread
when :pop_op
pop = channel.pop_op
expect(pop.pending?).to eq true
else
raise
end
expect(channel.size).to eq 0
case push_type
when :try_push
expect(channel.try_push message).to eq true
when :push
expect(channel.push(message)).to eq channel
when :push_op
expect(channel.push_op(message).value!).to eq channel
else
raise
end
expect(channel.size).to eq 0
case pop_type
when :pop
expect(thread.value).to eq message
when :pop_op
expect(pop.value!).to eq message
else
raise
end
end
specify 'exchanging' do
push_first :push, :try_pop
push_first :push, :pop
push_first :push, :pop_op
push_first :push_op, :try_pop
push_first :push_op, :pop
push_first :push_op, :pop_op
pop_first :pop, :try_push
pop_first :pop, :push
pop_first :pop, :push_op
pop_first :pop_op, :try_push
pop_first :pop_op, :push
pop_first :pop_op, :push_op
ch1 = Concurrent::Promises::Channel.new 0
ch2 = Concurrent::Promises::Channel.new 0
selection = ch1.select_op(ch2)
expect(ch2.try_push(:v3)).to be_truthy
expect(selection.value!).to eq [ch2, :v3]
end
specify 'integration' do
ch1 = Concurrent::Promises::Channel.new
ch2 = Concurrent::Promises::Channel.new
ch3 = Concurrent::Promises::Channel.new
add = -> *_ do
(ch1.pop_op & ch2.pop_op).then do |a, b|
if a == :done && b == :done
:done
else
# do not add again until push is done
ch3.push_op(a + b).then(&add)
end
end
end
ch1.push_op 1
ch2.push_op 2
ch1.push_op 'a'
ch2.push_op 'b'
ch1.push_op nil
ch2.push_op true
result = Concurrent::Promises.future(&add).run.result
expect(result[0..1]).to eq [false, nil]
expect(result[2]).to be_a_kind_of(NoMethodError)
expect(ch3.pop_op.value!).to eq 3
expect(ch3.pop_op.value!).to eq 'ab'
ch1.push_op 1
ch2.push_op 2
ch1.push_op 'a'
ch2.push_op 'b'
ch1.push_op :done
ch2.push_op :done
expect(Concurrent::Promises.future(&add).run.result).to eq [true, :done, nil]
expect(ch3.pop_op.value!).to eq 3
expect(ch3.pop_op.value!).to eq 'ab'
end
end
end
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