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require_relative 'thread_pool_shared'
module Concurrent
RSpec.describe FixedThreadPool do
let!(:num_threads){ 5 }
subject { described_class.new(num_threads) }
after(:each) do
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
it_should_behave_like :thread_pool
let(:latch) { Concurrent::CountDownLatch.new }
context '#initialize default values' do
subject { described_class.new(5) }
it 'defaults :min_length correctly' do
expect(subject.min_length).to eq 5
end
it 'defaults :max_length correctly' do
expect(subject.max_length).to eq 5
end
it 'defaults :fallback_policy to :abort' do
expect(subject.fallback_policy).to eq :abort
end
it 'defaults :idletime correctly' do
expect(subject.idletime).to eq subject.class.const_get(:DEFAULT_THREAD_IDLETIMEOUT)
end
it 'defaults default :max_queue to zero' do
expect(subject.max_queue).to eq 0
end
end
context '#initialize explicit values' do
it 'raises an exception when the pool length is less than one' do
expect {
described_class.new(0)
}.to raise_error(ArgumentError)
end
it 'sets explicit :max_queue correctly' do
subject = described_class.new(5, :max_queue => 10)
expect(subject.max_queue).to eq 10
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
it 'correctly sets valid :fallback_policy' do
subject = described_class.new(5, :fallback_policy => :caller_runs)
expect(subject.fallback_policy).to eq :caller_runs
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
it "correctly sets valid :idletime" do
subject = described_class.new(5, :idletime => 10)
expect(subject.idletime).to eq 10
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
it 'raises an exception if given an invalid :fallback_policy' do
expect {
described_class.new(5, fallback_policy: :bogus)
}.to raise_error(ArgumentError)
end
end
context '#min_length' do
it 'returns :num_threads on creation' do
expect(subject.min_length).to eq num_threads
end
it 'returns :num_threads while running' do
10.times{ subject.post{ nil } }
subject.post { latch.count_down }
latch.wait(0.1)
expect(subject.min_length).to eq num_threads
end
it 'returns :num_threads once shutdown' do
10.times{ subject.post{ nil } }
subject.post { latch.count_down }
latch.wait(0.1)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject.min_length).to eq num_threads
end
end
context '#max_length' do
it 'returns :num_threads on creation' do
expect(subject.max_length).to eq num_threads
end
it 'returns :num_threads while running' do
10.times{ subject.post{ nil } }
subject.post { latch.count_down }
latch.wait(0.1)
expect(subject.max_length).to eq num_threads
end
it 'returns :num_threads once shutdown' do
10.times{ subject.post{ nil } }
subject.post { latch.count_down }
latch.wait(0.1)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject.max_length).to eq num_threads
end
end
context '#length' do
it 'returns :num_threads while running' do
10.times{ subject.post{ nil } }
subject.post { latch.count_down }
latch.wait(0.1)
expect(subject.length).to eq num_threads
end
end
context '#largest_length' do
it 'returns zero on creation' do
expect(subject.largest_length).to eq 0
end
it 'returns :num_threads while running' do
10.times{ subject.post{ nil } }
subject.post { latch.count_down }
latch.wait(0.1)
expect(subject.largest_length).to eq num_threads
end
it 'returns :num_threads once shutdown' do
10.times{ subject.post{ nil } }
subject.post { latch.count_down }
latch.wait(0.1)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject.largest_length).to eq num_threads
end
end
context '#kill' do
it 'attempts to kill all in-progress tasks' do
thread_count = [subject.length, 5].max
@expected = false
thread_count.times do
# kill tries to shutdown first with 1sec timeout, so wait 2sec here
subject.post { sleep(2) }
end
subject.post{ @expected = true }
sleep(0.1)
subject.kill
sleep(0.1)
expect(@expected).to be_falsey
end
end
context 'worker creation and caching' do
it 'never creates more than :num_threads threads' do
pool = described_class.new(5)
latch = Concurrent::CountDownLatch.new 1
100.times{ pool << proc{ latch.wait } }
sleep(0.1)
expect(pool.length).to eq 5
latch.count_down
pool.shutdown
expect(pool.wait_for_termination(pool_termination_timeout)).to eq true
end
end
context 'fallback policy' do
before(:each) do
@queue = Queue.new
end
after(:each) do
subject.shutdown
end
# On abort, it should raise an error
it "raises an error when overflow on abort" do
latch = Concurrent::CountDownLatch.new(5)
mutex = Mutex.new
subject = described_class.new(2, :max_queue => 2, :fallback_policy => :abort)
expect {
5.times do |i|
subject.post do
sleep 0.1
mutex.synchronize{ @queue << i }
latch.count_down
end
end
latch.wait(1)
}.to raise_error(RejectedExecutionError)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
# On discard, we'd expect no error, but also not all five results
it 'discards when fallback_policy is :discard' do
latch = Concurrent::CountDownLatch.new(5)
mutex = Mutex.new
subject = described_class.new(2, :max_queue => 2, :fallback_policy => :discard)
5.times do |i|
subject.post do
sleep 0.1
mutex.synchronize{ @queue << i }
latch.count_down
end
end
latch.wait(1)
expect(@queue.length).to be < 5
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
# To check for caller_runs, we'll check how many unique threads
# actually ran the block
it 'uses the calling thread for overflow under caller_runs' do
latch = Concurrent::CountDownLatch.new(5)
mutex = Mutex.new
subject = described_class.new(2, :max_queue => 2, :fallback_policy => :caller_runs)
5.times do |i|
subject.post do
sleep 0.1
mutex.synchronize{ @queue << Thread.current }
latch.count_down
end
end
latch.wait(1)
# Turn the queue into an array
a = []
a << @queue.shift until @queue.empty?
#NOTE: This test is very, very difficult to setup properly. Hence the 'be_within' matcher
expect(a.size).to be_within(1).of(5) # one for each run of the block
expect(a.uniq.size).to be_within(1).of(3) # one for each of the two threads, plus the caller
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
end
context 'runtime-specific implementation' do
if Concurrent.on_jruby?
it 'sets :fallback_policy correctly' do
clazz = java.util.concurrent.ThreadPoolExecutor::DiscardPolicy
policy = clazz.new
expect(clazz).to receive(:new).at_least(:once).with(any_args).and_return(policy)
subject = FixedThreadPool.new(5, fallback_policy: :discard)
expect(subject.fallback_policy).to eq :discard
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
else
context 'exception handling' do
it 'restarts threads that experience exception' do
count = subject.length
count.times{ subject << proc{ raise StandardError } }
sleep(1)
expect(subject.length).to eq count
end
end
context 'worker creation and caching' do
it 'creates new workers when there are none available' do
pool = described_class.new(5)
expect(pool.length).to eq 0
5.times{ pool << proc{ sleep(1) } }
sleep(0.1)
expect(pool.length).to eq 5
pool.shutdown
expect(pool.wait_for_termination(pool_termination_timeout)).to eq true
end
end
end
end
end
end
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