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RSpec.describe Concurrent::AtomicMarkableReference do
subject { described_class.new 1000, true }
describe '.initialize' do
it 'constructs the object' do
expect(subject.value).to eq 1000
expect(subject.marked?).to eq true
end
it 'has sane defaults' do
amr = described_class.new
expect(amr.value).to eq nil
expect(amr.marked?).to eq false
end
end
describe '#set' do
it 'sets the value and mark' do
val, mark = subject.set 1001, true
expect(subject.value).to eq 1001
expect(subject.marked?).to eq true
expect(val).to eq 1001
expect(mark).to eq true
end
end
describe '#try_update!' do
it 'updates the value and mark' do
val, mark = subject.try_update! { |v, m| [v + 1, !m] }
expect(subject.value).to eq 1001
expect(val).to eq 1001
expect(mark).to eq false
end
it 'raises ConcurrentUpdateError when attempting to set inside of block' do
expect do
subject.try_update! do |v, m|
subject.set(1001, false)
[v + 1, !m]
end
end.to raise_error Concurrent::ConcurrentUpdateError
end
end
describe '#try_update' do
it 'updates the value and mark' do
val, mark = subject.try_update { |v, m| [v + 1, !m] }
expect(subject.value).to eq 1001
expect(val).to eq 1001
expect(mark).to eq false
end
it 'returns nil when attempting to set inside of block' do
expect do
subject.try_update do |v, m|
subject.set(1001, false)
[v + 1, !m]
end.to eq nil
end
end
end
describe '#update' do
it 'updates the value and mark' do
val, mark = subject.update { |v, m| [v + 1, !m] }
expect(subject.value).to eq 1001
expect(subject.marked?).to eq false
expect(val).to eq 1001
expect(mark).to eq false
end
it 'retries until update succeeds' do
tries = 0
subject.update do |v, m|
tries += 1
subject.set(1001, false)
[v + 1, !m]
end
expect(tries).to eq 2
end
end
describe '#compare_and_set' do
context 'when objects have the same identity' do
it 'sets the value and mark' do
arr = [1, 2, 3]
subject.set(arr, true)
expect(subject.compare_and_set(arr, 1.2, true, false)).to be_truthy
end
end
context 'when objects have the different identity' do
it 'it does not set the value or mark' do
subject.set([1, 2, 3], true)
expect(subject.compare_and_set([1, 2, 3], 1.2, true, false))
.to be_falsey
end
context 'when comparing Numeric objects' do
context 'Non-idepotent Float' do
it 'sets the value and mark' do
subject.set(1.0 + 0.1, true)
expect(subject.compare_and_set(1.0 + 0.1, 1.2, true, false))
.to be_truthy
end
end
context 'BigNum' do
it 'sets the value and mark' do
subject.set(2**100, false)
expect(subject.compare_and_set(2**100, 2**99, false, true))
.to be_truthy
end
end
context 'Rational' do
it 'sets the value and mark' do
require 'rational' unless ''.respond_to? :to_r
subject.set(Rational(1, 3), true)
comp = subject.compare_and_set(Rational(1, 3),
Rational(3, 1),
true,
false)
expect(comp).to be_truthy
end
end
end
context 'Rational' do
it 'is successful' do
# Complex
require 'complex' unless ''.respond_to? :to_c
subject.set(Complex(1, 2), false)
comp = subject.compare_and_set(Complex(1, 2),
Complex(1, 3),
false,
true)
expect(comp)
.to be_truthy
end
end
end
end
end
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