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require 'timecop'
module Concurrent
RSpec.describe TimerSet do
let(:executor){ Concurrent::ImmediateExecutor.new }
subject{ TimerSet.new(executor: executor) }
after(:each){ subject.shutdown }
context 'construction' do
it 'uses the executor given at construction' do
subject = TimerSet.new(executor: Concurrent.global_immediate_executor)
expect(subject.instance_variable_get(:@task_executor)).to eq Concurrent.global_immediate_executor
end
it 'uses the global io executor be default' do
subject = TimerSet.new
expect(subject.instance_variable_get(:@task_executor)).to eq Concurrent.global_io_executor
end
end
context '#post' do
it 'raises an exception when given a task with a delay less than zero' do
expect {
subject.post(-10){ nil }
}.to raise_error(ArgumentError)
end
it 'raises an exception when no block given' do
expect {
subject.post(10)
}.to raise_error(ArgumentError)
end
it 'immediately posts a task when the delay is zero' do
timer = subject.instance_variable_get(:@timer_executor)
expect(timer).not_to receive(:post).with(any_args)
subject.post(0){ true }
end
end
context 'execution' do
it 'executes a given task when given an interval in seconds' do
latch = CountDownLatch.new(1)
subject.post(0.1){ latch.count_down }
expect(latch.wait(0.2)).to be_truthy
end
it 'returns an IVar when posting a task' do
expect(subject.post(0.1) { nil }).to be_a Concurrent::IVar
end
it 'executes a given task when given an interval in seconds, even if longer tasks have been scheduled' do
latch = CountDownLatch.new(1)
subject.post(0.5){ nil }
subject.post(0.1){ latch.count_down }
expect(latch.wait(0.2)).to be_truthy
end
it 'passes all arguments to the task on execution' do
expected = AtomicReference.new
latch = CountDownLatch.new(1)
subject.post(0.1, 1, 2, 3) do |*args|
expected.value = args
latch.count_down
end
expect(latch.wait(0.2)).to be_truthy
expect(expected.value).to eq [1, 2, 3]
end
it 'does not execute tasks early' do
latch = Concurrent::CountDownLatch.new(1)
start = Time.now.to_f
subject.post(0.2){ latch.count_down }
expect(latch.wait(1)).to be true
expect(Time.now.to_f - start).to be >= 0.19
end
it 'executes all tasks scheduled for the same time' do
latch = CountDownLatch.new(5)
5.times{ subject.post(0.1){ latch.count_down } }
expect(latch.wait(1)).to be_truthy
end
it 'executes tasks with different times in schedule order' do
latch = CountDownLatch.new(3)
expected = []
3.times{|i| subject.post(i/10){ expected << i; latch.count_down } }
latch.wait(1)
expect(expected).to eq [0, 1, 2]
end
it 'executes tasks with different times in schedule time' do
tests = 3
interval = 0.1
latch = CountDownLatch.new(tests)
expected = Queue.new
start = Time.now
(1..tests).each do |i|
subject.post(interval * i) { expected << Time.now - start; latch.count_down }
end
expect(latch.wait((tests * interval) + 1)).to be true
(1..tests).each do |i|
delta = expected.pop
expect(delta).to be_within(0.1).of((i * interval) + 0.05)
end
end
it 'continues to execute new tasks even after the queue is emptied' do
3.times do |i|
task = subject.post(0.1){ i }
expect(task.value).to eq i
end
end
end
context 'resolution' do
it 'sets the IVar value on success when delay is zero' do
job = subject.post(0){ 42 }
expect(job.value).to eq 42
expect(job.reason).to be_nil
expect(job).to be_fulfilled
end
it 'sets the IVar value on success when given a delay' do
job = subject.post(0.1){ 42 }
expect(job.value).to eq 42
expect(job.reason).to be_nil
expect(job).to be_fulfilled
end
it 'sets the IVar reason on failure when delay is zero' do
error = ArgumentError.new('expected error')
job = subject.post(0){ raise error }
expect(job.value).to be_nil
expect(job.reason).to eq error
expect(job).to be_rejected
end
it 'sets the IVar reason on failure when given a delay' do
error = ArgumentError.new('expected error')
job = subject.post(0.1){ raise error }
expect(job.value).to be_nil
expect(job.reason).to eq error
expect(job).to be_rejected
end
end
context 'task cancellation' do
after(:each) do
Timecop.return
end
it 'fails to cancel the task once processing has begun' do
start_latch = Concurrent::CountDownLatch.new
continue_latch = Concurrent::CountDownLatch.new
job = subject.post(0.1) do
start_latch.count_down
continue_latch.wait(2)
42
end
start_latch.wait(2)
success = job.cancel
continue_latch.count_down
expect(success).to be false
expect(job.value).to eq 42
expect(job.reason).to be_nil
end
it 'fails to cancel the task once processing is complete' do
job = subject.post(0.1){ 42 }
job.wait(2)
success = job.cancel
expect(success).to be false
expect(job.value).to eq 42
expect(job.reason).to be_nil
end
it 'cancels a pending task' do
actual = AtomicBoolean.new(false)
Timecop.freeze
job = subject.post(0.1){ actual.make_true }
success = job.cancel
Timecop.travel(1)
expect(success).to be true
expect(job.value(0)).to be_nil
expect(job.reason).to be_a CancelledOperationError
end
it 'returns false when not running' do
task = subject.post(10){ nil }
subject.shutdown
expect(expect(subject.wait_for_termination(pool_termination_timeout)).to eq true).to eq true
expect(task.cancel).to be false
end
end
context 'task rescheduling' do
let(:queue) { subject.instance_variable_get(:@queue) }
it 'raises an exception when given an invalid time' do
task = subject.post(10){ nil }
expect{ task.reschedule(-1) }.to raise_error(ArgumentError)
end
it 'does not change the current schedule when given an invalid time' do
task = subject.post(10){ nil }
expected = task.schedule_time
begin
task.reschedule(-1)
rescue
end
expect(task.schedule_time).to eq expected
end
it 'reschdules a pending and unpost task when given a valid time' do
initial_delay = 10
rescheduled_delay = 20
task = subject.post(initial_delay){ nil }
original_schedule = task.schedule_time
success = task.reschedule(rescheduled_delay)
expect(success).to be true
expect(task.initial_delay).to be_within(0.01).of(rescheduled_delay)
expect(task.schedule_time).to be > original_schedule
end
it 'returns false once the task has been post to the executor' do
start_latch = Concurrent::CountDownLatch.new
continue_latch = Concurrent::CountDownLatch.new
task = subject.post(0.1) do
start_latch.count_down
continue_latch.wait(2)
end
start_latch.wait(2)
expected = task.schedule_time
success = task.reschedule(10)
continue_latch.count_down
expect(success).to be false
expect(task.schedule_time).to eq expected
end
it 'returns false once the task is processing' do
start_latch = Concurrent::CountDownLatch.new
continue_latch = Concurrent::CountDownLatch.new
task = subject.post(0.1) do
start_latch.count_down
continue_latch.wait(2)
end
start_latch.wait(2)
expected = task.schedule_time
success = task.reschedule(10)
continue_latch.count_down
expect(success).to be false
expect(task.schedule_time).to eq expected
end
it 'returns false once the task has is complete' do
task = subject.post(0.1){ nil }
task.value(2)
expected = task.schedule_time
success = task.reschedule(10)
expect(success).to be false
expect(task.schedule_time).to eq expected
end
it 'returns false when not running' do
task = subject.post(10){ nil }
subject.shutdown
expect(expect(subject.wait_for_termination(pool_termination_timeout)).to eq true).to eq true
expected = task.schedule_time
success = task.reschedule(10)
expect(success).to be false
expect(task.schedule_time).to be_within(0.01).of(expected)
end
end
context 'task resetting' do
it 'calls #reschedule with the original delay' do
initial_delay = 10
task = subject.post(initial_delay){ nil }
expect(task).to receive(:ns_reschedule).with(initial_delay)
task.reset
end
end
context 'termination' do
it 'cancels all pending tasks on #shutdown' do
queue = subject.instance_variable_get(:@queue)
expect(queue).to receive(:clear).with(no_args).at_least(:once)
subject.shutdown
end
it 'cancels all pending tasks on #kill' do
queue = subject.instance_variable_get(:@queue)
expect(queue).to receive(:clear).with(no_args).at_least(:once)
subject.kill
end
it 'stops the monitor thread on #shutdown' do
timer_executor = subject.instance_variable_get(:@timer_executor)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(timer_executor).not_to be_running
end
it 'kills the monitor thread on #kill' do
timer_executor = subject.instance_variable_get(:@timer_executor)
subject.kill
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(timer_executor).not_to be_running
end
it 'rejects tasks once shutdown' do
queue = subject.instance_variable_get(:@queue)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
subject.post(1) { nil }
expect(queue).to be_empty
end
it 'rejects tasks once killed' do
queue = subject.instance_variable_get(:@queue)
subject.kill
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
subject.post(1) { nil }
expect(queue).to be_empty
end
specify '#wait_for_termination returns true if shutdown completes before timeout' do
latch = Concurrent::CountDownLatch.new(1)
subject.post(0){ latch.count_down }
latch.wait(1)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to be_truthy
end
specify '#wait_for_termination returns false on timeout' do
latch = Concurrent::CountDownLatch.new(1)
subject.post(0){ latch.count_down }
latch.wait(0.1)
# do not call shutdown -- force timeout
expect(subject.wait_for_termination(0.1)).to be_falsey
end
end
context 'state' do
it 'is running? when first created' do
expect(subject).to be_running
expect(subject).not_to be_shutdown
end
it 'is running? after tasks have been post' do
subject.post(0.1){ nil }
expect(subject).to be_running
expect(subject).not_to be_shutdown
end
it 'is shutdown? after shutdown completes' do
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject).not_to be_running
expect(subject).to be_shutdown
end
it 'is shutdown? after being killed' do
subject.kill
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject).not_to be_running
expect(subject).to be_shutdown
end
end
end
end
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