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thread_pool_executor_shared.rb
621 lines (497 loc) · 18.9 KB
/
thread_pool_executor_shared.rb
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require_relative 'thread_pool_shared'
RSpec.shared_examples :thread_pool_executor do
after(:each) do
subject.shutdown
subject.wait_for_termination(pool_termination_timeout)
end
context '#initialize defaults' do
subject { described_class.new }
it 'defaults :min_length to DEFAULT_MIN_POOL_SIZE' do
expect(subject.min_length).to eq described_class::DEFAULT_MIN_POOL_SIZE
end
it 'defaults :max_length to DEFAULT_MAX_POOL_SIZE' do
expect(subject.max_length).to eq described_class::DEFAULT_MAX_POOL_SIZE
end
it 'defaults :idletime to DEFAULT_THREAD_IDLETIMEOUT' do
expect(subject.idletime).to eq described_class::DEFAULT_THREAD_IDLETIMEOUT
end
it 'defaults :max_queue to DEFAULT_MAX_QUEUE_SIZE' do
expect(subject.max_queue).to eq described_class::DEFAULT_MAX_QUEUE_SIZE
end
it 'defaults :fallback_policy to :abort' do
expect(subject.fallback_policy).to eq :abort
end
it 'defaults :name to nil' do
expect(subject.name).to be_nil
end
end
context "#initialize explicit values" do
it "sets :min_threads" do
pool = described_class.new(min_threads: 2)
expect(pool.min_length).to eq 2
pool.shutdown
expect(pool.wait_for_termination(pool_termination_timeout)).to eq true
end
it "sets :max_threads" do
pool = described_class.new(max_threads: 2)
expect(pool.max_length).to eq 2
pool.shutdown
expect(pool.wait_for_termination(pool_termination_timeout)).to eq true
end
it "sets :idletime" do
pool = described_class.new(idletime: 2)
expect(pool.idletime).to eq 2
pool.shutdown
expect(pool.wait_for_termination(pool_termination_timeout)).to eq true
end
it "doesn't allow max_threads < min_threads" do
expect {
described_class.new(min_threads: 2, max_threads: 1)
}.to raise_error(ArgumentError)
end
it 'accepts all valid fallback policies' do
Concurrent::RubyThreadPoolExecutor::FALLBACK_POLICIES.each do |policy|
subject = described_class.new(fallback_policy: policy)
expect(subject.fallback_policy).to eq policy
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
end
it 'raises an exception if :max_threads is less than zero' do
expect {
described_class.new(max_threads: -1)
}.to raise_error(ArgumentError)
end
it 'raises an exception if :min_threads is less than zero' do
expect {
described_class.new(min_threads: -1)
}.to raise_error(ArgumentError)
end
it 'raises an exception if :max_threads greater than the max allowable' do
expect {
described_class.new(max_threads: described_class::DEFAULT_MAX_POOL_SIZE+1)
}.to raise_error(ArgumentError)
end
it 'raises an exception if :max_threads is less than :min_threads' do
expect {
described_class.new(max_threads: 1, min_threads: 100)
}.to raise_error(ArgumentError)
end
it 'raises an exception if given an invalid :fallback_policy' do
expect {
described_class.new(fallback_policy: :bogus)
}.to raise_error(ArgumentError)
end
it 'sets :name' do
pool = described_class.new(name: 'MyPool')
expect(pool.name).to eq 'MyPool'
pool.shutdown
pool.wait_for_termination(pool_termination_timeout)
end
end
context '#max_queue' do
let!(:expected_max){ 100 }
subject{ described_class.new(max_queue: expected_max) }
it 'returns the set value on creation' do
expect(subject.max_queue).to eq expected_max
end
it 'returns the set value when running', :truffle_bug => true do # only actually fails for RubyThreadPoolExecutor
trigger = Concurrent::Event.new
5.times{ subject.post{ trigger.wait } }
expect(subject.max_queue).to eq expected_max
trigger.set
end
it 'returns the set value after stopping' do
5.times{ subject.post{ nil } }
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject.max_queue).to eq expected_max
end
end
context '#synchronous' do
subject do
described_class.new(
min_threads: 1,
max_threads: 2,
max_queue: 0,
synchronous: true,
fallback_policy: :abort
)
end
it 'cannot be set unless `max_queue` is zero' do
expect {
described_class.new(
min_threads: 2,
max_threads: 5,
max_queue: 1,
fallback_policy: :discard,
synchronous: true
)
}.to raise_error(ArgumentError)
end
it 'executes fallback policy once max_threads has been reached' do
latch = Concurrent::CountDownLatch.new(1)
(subject.max_length).times do
subject.post {
latch.wait
}
end
expect(subject.queue_length).to eq 0
# verify nothing happening
20.times {
expect {
subject.post {
sleep
}
}.to raise_error(Concurrent::RejectedExecutionError)
}
# release
latch.count_down
end
end
context '#queue_length', :truffle_bug => true do # only actually fails for RubyThreadPoolExecutor
let!(:expected_max){ 10 }
subject do
described_class.new(
min_threads: 2,
max_threads: 5,
max_queue: expected_max,
fallback_policy: :discard
)
end
it 'returns zero on creation' do
expect(subject.queue_length).to eq 0
end
it 'returns zero when there are no enqueued tasks' do
latch = Concurrent::CountDownLatch.new(5)
5.times{ subject.post{ latch.count_down } }
latch.wait(0.1)
expect(subject.queue_length).to eq 0
end
it 'returns the size of the queue when tasks are enqueued' do
trigger = Concurrent::Event.new
20.times{ subject.post{ trigger.wait } }
expect(subject.queue_length).to be > 0
trigger.set
end
it 'returns zero when stopped' do
trigger = Concurrent::Event.new
20.times{ subject.post{ trigger.wait } }
subject.shutdown
trigger.set
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject.queue_length).to eq 0
end
it 'can never be greater than :max_queue' do
trigger = Concurrent::Event.new
20.times{ subject.post{ trigger.wait } }
expect(subject.queue_length).to be <= expected_max
trigger.set
end
end
context '#remaining_capacity' do
let!(:expected_max){ 100 }
subject{ described_class.new(max_queue: expected_max) }
it 'returns -1 when :max_queue is set to zero' do
executor = described_class.new(max_queue: 0)
expect(executor.remaining_capacity).to eq(-1)
executor.shutdown
expect(executor.wait_for_termination(pool_termination_timeout)).to eq true
end
it 'returns :max_length on creation' do
expect(subject.remaining_capacity).to eq expected_max
end
it 'returns :max_length when stopped' do
100.times{ subject.post{ nil } }
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject.remaining_capacity).to eq expected_max
end
end
context '#fallback_policy' do
let!(:min_threads){ 1 }
let!(:max_threads){ 1 }
let!(:idletime){ 60 }
let!(:max_queue){ 1 }
context ':abort' do
subject do
described_class.new(
min_threads: min_threads,
max_threads: max_threads,
idletime: idletime,
max_queue: max_queue,
fallback_policy: :abort
)
end
specify '#post raises an error when the queue is at capacity' do
trigger = Concurrent::Event.new
expect {
20.times{ subject.post{ trigger.wait } }
}.to raise_error(Concurrent::RejectedExecutionError)
trigger.set
end
specify '#<< raises an error when the queue is at capacity' do
trigger = Concurrent::Event.new
expect {
20.times{ subject << proc { trigger.wait } }
}.to raise_error(Concurrent::RejectedExecutionError)
trigger.set
end
specify '#post raises an error when the executor is shutting down' do
trigger = Concurrent::Event.new
expect {
subject.shutdown; subject.post{ trigger.wait }
}.to raise_error(Concurrent::RejectedExecutionError)
trigger.set
end
specify '#<< raises an error when the executor is shutting down' do
trigger = Concurrent::Event.new
expect {
subject.shutdown; subject << proc { trigger.wait }
}.to raise_error(Concurrent::RejectedExecutionError)
trigger.set
end
specify 'a #post task is never executed when the queue is at capacity' do
all_tasks_posted = Concurrent::Event.new
latch = Concurrent::CountDownLatch.new(max_threads)
initial_executed = Concurrent::AtomicFixnum.new(0)
subsequent_executed = Concurrent::AtomicFixnum.new(0)
# Fill up all the threads (with a task that won't complete until
# all tasks are posted)
max_threads.times do
subject.post{ latch.count_down; all_tasks_posted.wait ; initial_executed.increment;}
end
# Wait for all those tasks to be taken off the queue onto a
# worker thread and start executing
latch.wait
# Fill up the queue (with a task that won't complete until
# all tasks are posted)
max_queue.times do
subject.post{ all_tasks_posted.wait; initial_executed.increment; }
end
# Inject 20 more tasks, which should throw an exception
20.times do
expect {
subject.post { subsequent_executed.increment; }
}.to raise_error(Concurrent::RejectedExecutionError)
end
# Trigger the event, so that the tasks in the threads and on
# the queue can run to completion
all_tasks_posted.set
# Wait for all tasks to finish
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
# The tasks should have run until all the threads and the
# queue filled up...
expect(initial_executed.value).to be (max_threads + max_queue)
# ..but been dropped after that
expect(subsequent_executed.value).to be 0
end
specify 'a #<< task is never executed when the queue is at capacity' do
all_tasks_posted = Concurrent::Event.new
latch = Concurrent::CountDownLatch.new(max_threads)
initial_executed = Concurrent::AtomicFixnum.new(0)
subsequent_executed = Concurrent::AtomicFixnum.new(0)
# Fill up all the threads (with a task that won't complete until
# all tasks are posted)
max_threads.times do
subject << proc { latch.count_down; all_tasks_posted.wait ; initial_executed.increment;}
end
# Wait for all those tasks to be taken off the queue onto a
# worker thread and start executing
latch.wait
# Fill up the queue (with a task that won't complete until
# all tasks are posted)
max_queue.times do
subject << proc { all_tasks_posted.wait; initial_executed.increment; }
end
# Inject 20 more tasks, which should throw an exeption
20.times do
expect {
subject << proc { subsequent_executed.increment; }
}.to raise_error(Concurrent::RejectedExecutionError)
end
# Trigger the event, so that the tasks in the threads and on
# the queue can run to completion
all_tasks_posted.set
# Wait for all tasks to finish
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
# The tasks should have run until all the threads and the
# queue filled up...
expect(initial_executed.value).to be (max_threads + max_queue)
# ..but been rejected after that
expect(subsequent_executed.value).to be 0
end
end
context ':discard' do
subject do
described_class.new(
min_threads: min_threads,
max_threads: max_threads,
idletime: idletime,
max_queue: max_queue,
fallback_policy: :discard
)
end
specify 'a #post task is never executed when the queue is at capacity' do
all_tasks_posted = Concurrent::Event.new
latch = Concurrent::CountDownLatch.new(max_threads)
initial_executed = Concurrent::AtomicFixnum.new(0)
subsequent_executed = Concurrent::AtomicFixnum.new(0)
# Fill up all the threads (with a task that won't complete until
# all tasks are posted)
max_threads.times do
subject.post{ latch.count_down; all_tasks_posted.wait ; initial_executed.increment;}
end
# Wait for all those tasks to be taken off the queue onto a
# worker thread and start executing
latch.wait
# Fill up the queue (with a task that won't complete until
# all tasks are posted)
max_queue.times do
subject.post{ all_tasks_posted.wait; initial_executed.increment; }
end
# Inject 20 more tasks, which should be dropped without an exception
20.times do
subject.post{ subsequent_executed.increment; }
end
# Trigger the event, so that the tasks in the threads and on
# the queue can run to completion
all_tasks_posted.set
# Wait for all tasks to finish
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
# The tasks should have run until all the threads and the
# queue filled up...
expect(initial_executed.value).to be (max_threads + max_queue)
# ..but been dropped after that
expect(subsequent_executed.value).to be 0
end
specify 'a #<< task is never executed when the queue is at capacity' do
all_tasks_posted = Concurrent::Event.new
latch = Concurrent::CountDownLatch.new(max_threads)
initial_executed = Concurrent::AtomicFixnum.new(0)
subsequent_executed = Concurrent::AtomicFixnum.new(0)
# Fill up all the threads (with a task that won't complete until
# all tasks are posted)
max_threads.times do
subject << proc { latch.count_down; all_tasks_posted.wait ; initial_executed.increment;}
end
# Wait for all those tasks to be taken off the queue onto a
# worker thread and start executing
latch.wait
# Fill up the queue (with a task that won't complete until
# all tasks are posted)
max_queue.times do
subject << proc { all_tasks_posted.wait; initial_executed.increment; }
end
# Inject 20 more tasks, which should be dropped without an exception
20.times do
subject << proc { subsequent_executed.increment; }
end
# Trigger the event, so that the tasks in the threads and on
# the queue can run to completion
all_tasks_posted.set
# Wait for all tasks to finish
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
# The tasks should have run until all the threads and the
# queue filled up...
expect(initial_executed.value).to be (max_threads + max_queue)
# ..but been dropped after that
expect(subsequent_executed.value).to be 0
end
specify 'a #post task is never executed when the executor is shutting down' do
executed = Concurrent::AtomicFixnum.new(0)
subject.shutdown
subject.post{ executed.increment }
# Wait for all tasks to finish
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(executed.value).to be 0
end
specify 'a #<< task is never executed when the executor is shutting down' do
executed = Concurrent::AtomicFixnum.new(0)
subject.shutdown
subject << proc { executed.increment }
# Wait for all tasks to finish
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(executed.value).to be 0
end
specify '#post returns false when the executor is shutting down' do
subject.shutdown
ret = subject.post{ nil }
expect(ret).to be false
end
end
context ':caller_runs' do
let(:executor) do
described_class.new(
min_threads: 1,
max_threads: 1,
idletime: idletime,
max_queue: 1,
fallback_policy: :caller_runs
)
end
after(:each) do
# need to replicate this w/i scope otherwise rspec may complain
executor.shutdown
expect(executor.wait_for_termination(pool_termination_timeout)).to eq true
end
specify '#post does not create any new threads when the queue is at capacity' do
trigger = Concurrent::Event.new
initial = Thread.list.length
executor = described_class.new(
min_threads: 1,
max_threads: 1,
idletime: idletime,
max_queue: 1,
fallback_policy: :caller_runs
)
# Post several tasks to the executor. Has to be a new thread,
# because it will start blocking once the queue fills up.
in_thread do
5.times{ executor.post{ trigger.wait } }
end
expect(Thread.list.length).to be < initial + 1 + 5
# Let the executor tasks complete.
trigger.set
executor.shutdown
expect(executor.wait_for_termination(pool_termination_timeout)).to eq true
end
specify '#<< executes the task on the current thread when the queue is at capacity' do
trigger = Concurrent::CountDownLatch.new(1)
latch = Concurrent::CountDownLatch.new(1)
executor.post{ trigger.wait }
main = Thread.current
executor.post do
expect(Thread.current).to eq main
latch.count_down
end
latch.wait(0.1)
trigger.count_down
end
specify '#post executes the task on the current thread when the queue is at capacity' do
trigger = Concurrent::Event.new
latch = Concurrent::CountDownLatch.new(5)
executor.post{ trigger.wait }
5.times{|i| executor.post{ latch.count_down } }
latch.wait(0.1)
trigger.set
end
specify '#post executes the task on the current thread when the executor is shutting down' do
latch = Concurrent::CountDownLatch.new(1)
executor.shutdown
executor.post{ latch.count_down }
latch.wait(0.1)
end
specify '#<< executes the task on the current thread when the executor is shutting down' do
latch = Concurrent::CountDownLatch.new(1)
executor.shutdown
executor << proc { latch.count_down }
latch.wait(0.1)
end
end
end
end