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module Concurrent
RSpec.describe 'dataflow' do
let(:executor) { ImmediateExecutor.new }
let(:root_executor) { SimpleExecutorService.new }
it 'raises an exception when no block given' do
expect { Concurrent::dataflow }.to raise_error(ArgumentError)
expect { Concurrent::dataflow_with(root_executor) }.to raise_error(ArgumentError)
end
specify '#dataflow uses the global fast executor' do
input = Future.execute{0}
expect(Concurrent).to receive(:dataflow_with).once.
with(Concurrent.global_io_executor, input)
Concurrent::dataflow(input){0}
end
specify '#dataflow_with uses the given executor' do
input = Future.execute{0}
result = Future.new{0}
expect(Future).to receive(:new).with(executor: root_executor).and_return(result)
Concurrent::dataflow_with(root_executor, input){0}
end
specify '#dataflow_with raises an exception when no executor given' do
expect {
Concurrent::dataflow_with(nil){ nil }
}.to raise_error(ArgumentError)
end
it 'accepts zero or more dependencies' do
Concurrent::dataflow(){0}
Concurrent::dataflow(Future.execute{0}){0}
Concurrent::dataflow(Future.execute{0}, Future.execute{0}){0}
Concurrent::dataflow_with(root_executor, ){0}
Concurrent::dataflow_with(root_executor, Future.execute{0}){0}
Concurrent::dataflow_with(root_executor, Future.execute{0}, Future.execute{0}){0}
end
it 'accepts uncompleted dependencies' do
d = Future.new(executor: executor){0}
Concurrent::dataflow(d){0}
d.execute
d = Future.new(executor: executor){0}
Concurrent::dataflow_with(root_executor, d){0}
d.execute
end
it 'accepts completed dependencies' do
d = Future.new(executor: executor){0}
d.execute
Concurrent::dataflow(d){0}
d = Future.new(executor: executor){0}
d.execute
Concurrent::dataflow_with(root_executor, d){0}
end
it 'raises an exception if any dependencies are not IVars' do
expect { Concurrent::dataflow(nil) }.to raise_error(ArgumentError)
expect { Concurrent::dataflow(Future.execute{0}, nil) }.to raise_error(ArgumentError)
expect { Concurrent::dataflow(nil, Future.execute{0}) }.to raise_error(ArgumentError)
expect { Concurrent::dataflow_with(root_executor, nil) }.to raise_error(ArgumentError)
expect { Concurrent::dataflow_with(root_executor, Future.execute{0}, nil) }.to raise_error(ArgumentError)
expect { Concurrent::dataflow_with(root_executor, nil, Future.execute{0}) }.to raise_error(ArgumentError)
end
it 'doesn\'t raise exceptions from dependencies, unless called with !' do
d1 = Concurrent::dataflow { raise 'd1 error' }
d2 = Concurrent::dataflow { raise 'd2 error' }
f = Concurrent::dataflow!(d1, d2) { |d1v, d2v| [d1v, d2v] }
expect { f.value! }.to raise_error(RuntimeError).with_message('d1 error')
d1 = Concurrent::dataflow { raise 'd1 error' }
d2 = Concurrent::dataflow { raise 'd2 error' }
f = Concurrent::dataflow(d1, d2) { |d1v, d2v| [d1v, d2v] }
expect { f.value! }.to_not raise_error
end
it 'returns a Future' do
expect(Concurrent::dataflow{0}).to be_a(Future)
expect(Concurrent::dataflow{0}).to be_a(Future)
end
context 'does not schedule the Future' do
specify 'if no dependencies are completed' do
d = Future.new(executor: executor){0}
f = Concurrent::dataflow(d){0}
expect(f).to be_unscheduled
d.execute
d = Future.new(executor: executor){0}
f = Concurrent::dataflow_with(root_executor, d){0}
expect(f).to be_unscheduled
d.execute
end
specify 'if one dependency of two is completed' do
d1 = Future.new(executor: executor){0}
d2 = Future.new(executor: executor){0}
f = Concurrent::dataflow(d1, d2){0}
d1.execute
expect(f).to be_unscheduled
d2.execute
d1 = Future.new(executor: executor){0}
d2 = Future.new(executor: executor){0}
f = Concurrent::dataflow_with(root_executor, d1, d2){0}
d1.execute
expect(f).to be_unscheduled
d2.execute
end
end
context 'schedules the Future when all dependencies are available' do
specify 'if there is just one' do
d = Future.new(executor: executor){0}
f = Concurrent::dataflow(d){0}
d.execute
expect(f.value).to eq 0
d = Future.new(executor: executor){0}
f = Concurrent::dataflow_with(root_executor, d){0}
d.execute
expect(f.value).to eq 0
end
specify 'if there is more than one' do
d1 = Future.new(executor: executor){0}
d2 = Future.new(executor: executor){0}
f = Concurrent::dataflow(d1, d2){0}
d1.execute
d2.execute
expect(f.value).to eq 0
d1 = Future.new(executor: executor){0}
d2 = Future.new(executor: executor){0}
f = Concurrent::dataflow_with(root_executor, d1, d2){0}
d1.execute
d2.execute
expect(f.value).to eq 0
end
end
context 'counts already executed dependencies' do
specify 'if there is just one' do
d = Future.new(executor: executor){0}
d.execute
f = Concurrent::dataflow(d){0}
expect(f.value).to eq 0
d = Future.new(executor: executor){0}
d.execute
f = Concurrent::dataflow_with(root_executor, d){0}
expect(f.value).to eq 0
end
specify 'if there is more than one' do
d1 = Future.new(executor: executor){0}
d2 = Future.new(executor: executor){0}
d1.execute
d2.execute
f = Concurrent::dataflow(d1, d2){0}
expect(f.value).to eq 0
d1 = Future.new(executor: executor){0}
d2 = Future.new(executor: executor){0}
d1.execute
d2.execute
f = Concurrent::dataflow_with(root_executor, d1, d2){0}
expect(f.value).to eq 0
end
end
context 'passes the values of dependencies into the block' do
specify 'if there is just one' do
d = Future.new(executor: executor){14}
f = Concurrent::dataflow(d){|v| v }
d.execute
expect(f.value).to eq 14
d = Future.new(executor: executor){14}
f = Concurrent::dataflow_with(root_executor, d){|v| v }
d.execute
expect(f.value).to eq 14
end
specify 'if there is more than one' do
d1 = Future.new(executor: executor){14}
d2 = Future.new(executor: executor){2}
f = Concurrent::dataflow(d1, d2) {|v1, v2| v1 + v2}
d1.execute
d2.execute
expect(f.value).to eq 16
d1 = Future.new(executor: executor){14}
d2 = Future.new(executor: executor){2}
f = Concurrent::dataflow_with(root_executor, d1, d2) {|v1, v2| v1 + v2}
d1.execute
d2.execute
expect(f.value).to eq 16
end
end
context 'module function' do
it 'can be called as Concurrent.dataflow and Concurrent.dataflow_with' do
def fib_with_dot(n)
if n < 2
Concurrent.dataflow { n }
else
n1 = fib_with_dot(n - 1)
n2 = fib_with_dot(n - 2)
Concurrent.dataflow_with(ImmediateExecutor.new, n1, n2) { n1.value + n2.value }
end
end
expected = fib_with_dot(7)
expect(expected.value).to eq 13
end
end
end
end
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