shard-crystal-db/spec/pool_spec.cr

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require "./spec_helper"
class ShouldSleepingOp
@is_sleeping = false
getter is_sleeping
getter sleep_happened
def initialize
@sleep_happened = Channel(Nil).new
end
def should_sleep
s = self
@is_sleeping = true
spawn do
sleep 0.1
s.is_sleeping.should be_true
s.sleep_happened.send(nil)
end
yield
@is_sleeping = false
end
def wait_for_sleep
@sleep_happened.receive
end
end
class WaitFor
def initialize
@channel = Channel(Nil).new
end
def wait
@channel.receive
end
def check
@channel.send(nil)
end
end
class Closable
include DB::Disposable
property before_checkout_called : Bool = false
property after_release_called : Bool = false
protected def do_close
end
def before_checkout
@before_checkout_called = true
end
def after_release
@after_release_called = true
end
end
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private def create_pool(**options, &factory : -> T) forall T
DB::Pool.new(DB::Pool::Options.new(**options), &factory)
end
describe DB::Pool do
it "should use proc to create objects" do
block_called = 0
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pool = create_pool(initial_pool_size: 3) { block_called += 1; Closable.new }
block_called.should eq(3)
end
it "should get resource" do
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pool = create_pool { Closable.new }
resource = pool.checkout
resource.should be_a Closable
resource.before_checkout_called.should be_true
end
it "should be available if not checkedout" do
resource = uninitialized Closable
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pool = create_pool(initial_pool_size: 1) { resource = Closable.new }
pool.is_available?(resource).should be_true
end
it "should not be available if checkedout" do
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pool = create_pool { Closable.new }
resource = pool.checkout
pool.is_available?(resource).should be_false
end
it "should be available if returned" do
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pool = create_pool { Closable.new }
resource = pool.checkout
resource.after_release_called.should be_false
pool.release resource
pool.is_available?(resource).should be_true
resource.after_release_called.should be_true
end
it "should wait for available resource" do
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pool = create_pool(max_pool_size: 1, initial_pool_size: 1) { Closable.new }
b_cnn_request = ShouldSleepingOp.new
wait_a = WaitFor.new
wait_b = WaitFor.new
spawn do
a_cnn = pool.checkout
b_cnn_request.wait_for_sleep
pool.release a_cnn
wait_a.check
end
spawn do
b_cnn_request.should_sleep do
pool.checkout
end
wait_b.check
end
wait_a.wait
wait_b.wait
end
it "should create new if max was not reached" do
block_called = 0
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pool = create_pool(max_pool_size: 2, initial_pool_size: 1) { block_called += 1; Closable.new }
block_called.should eq 1
pool.checkout
block_called.should eq 1
pool.checkout
block_called.should eq 2
end
it "should reuse returned resources" do
all = [] of Closable
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pool = create_pool(max_pool_size: 2, initial_pool_size: 1) { Closable.new.tap { |c| all << c } }
pool.checkout
b1 = pool.checkout
pool.release b1
b2 = pool.checkout
b1.should eq b2
all.size.should eq 2
end
it "should close available and total" do
all = [] of Closable
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pool = create_pool(max_pool_size: 2, initial_pool_size: 1) { Closable.new.tap { |c| all << c } }
a = pool.checkout
b = pool.checkout
pool.release b
all.size.should eq 2
all[0].closed?.should be_false
all[1].closed?.should be_false
pool.close
all[0].closed?.should be_true
all[1].closed?.should be_true
end
it "should timeout" do
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pool = create_pool(max_pool_size: 1, checkout_timeout: 0.1) { Closable.new }
pool.checkout
expect_raises DB::PoolTimeout do
pool.checkout
end
end
it "should be able to release after a timeout" do
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pool = create_pool(max_pool_size: 1, checkout_timeout: 0.1) { Closable.new }
a = pool.checkout
pool.checkout rescue nil
pool.release a
end
it "should close if max idle amount is reached" do
all = [] of Closable
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pool = create_pool(max_pool_size: 3, max_idle_pool_size: 1) { Closable.new.tap { |c| all << c } }
pool.checkout
pool.checkout
pool.checkout
all.size.should eq 3
all.any?(&.closed?).should be_false
pool.release all[0]
all.any?(&.closed?).should be_false
pool.release all[1]
all[0].closed?.should be_false
all[1].closed?.should be_true
all[2].closed?.should be_false
end
it "should not return closed resources to the pool" do
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pool = create_pool(max_pool_size: 1, max_idle_pool_size: 1) { Closable.new }
# pool size 1 should be reusing the one resource
resource1 = pool.checkout
pool.release resource1
resource2 = pool.checkout
resource1.should eq resource2
# it should not return a closed resource to the pool
resource2.close
pool.release resource2
resource2 = pool.checkout
resource1.should_not eq resource2
end
it "should create resource after max_pool was reached if idle forced some close up" do
all = [] of Closable
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pool = create_pool(max_pool_size: 3, max_idle_pool_size: 1) { Closable.new.tap { |c| all << c } }
pool.checkout
pool.checkout
pool.checkout
pool.release all[0]
pool.release all[1]
pool.checkout
pool.checkout
all.size.should eq 4
end
end