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describe :queue_deq, shared: true do
it "removes an item from the queue" do
q = @object.call
q << Object.new
q.size.should == 1
q.send @method
q.size.should == 0
end
it "returns items in the order they were added" do
q = @object.call
q << 1
q << 2
q.send(@method).should == 1
q.send(@method).should == 2
end
it "blocks the thread until there are items in the queue" do
q = @object.call
v = 0
th = Thread.new do
q.send(@method)
v = 1
end
v.should == 0
q << Object.new
th.join
v.should == 1
end
it "removes an item from a closed queue" do
q = @object.call
q << 1
q.close
q.send(@method).should == 1
end
it "converts false-ish for non_blocking to boolean" do
q = @object.call
q << 1
q << 2
q.send(@method, false).should == 1
q.send(@method, nil).should == 2
end
it "returns nil for a closed empty queue" do
q = @object.call
q.close
q.send(@method).should == nil
end
it "returns nil for an empty queue that becomes closed" do
q = @object.call
t = Thread.new {
q.send(@method).should == nil
}
Thread.pass until t.status == "sleep" && q.num_waiting == 1
q.close
t.join
end
describe "with a timeout" do
ruby_version_is "3.2" do
it "returns an item if one is available in time" do
q = @object.call
t = Thread.new {
q.send(@method, timeout: TIME_TOLERANCE).should == 1
}
Thread.pass until t.status == "sleep" && q.num_waiting == 1
q << 1
t.join
end
it "returns nil if no item is available in time" do
q = @object.call
Thread.new {
q.send(@method, timeout: 0.001).should == nil
}.join
end
it "does nothing if the timeout is nil" do
q = @object.call
t = Thread.new {
q.send(@method, timeout: nil).should == 1
}
Thread.pass until t.status == "sleep" && q.num_waiting == 1
q << 1
t.join
end
it "immediately returns nil if no item is available and the timeout is 0" do
q = @object.call
q << 1
q.send(@method, timeout: 0).should == 1
q.send(@method, timeout: 0).should == nil
end
it "raise TypeError if timeout is not a valid numeric" do
q = @object.call
-> {
q.send(@method, timeout: "1")
}.should raise_error(TypeError, "no implicit conversion to float from string")
-> {
q.send(@method, timeout: false)
}.should raise_error(TypeError, "no implicit conversion to float from false")
end
it "raise ArgumentError if non_block = true is passed too" do
q = @object.call
-> {
q.send(@method, true, timeout: 1)
}.should raise_error(ArgumentError, "can't set a timeout if non_block is enabled")
end
it "returns nil for a closed empty queue" do
q = @object.call
q.close
q.send(@method, timeout: 0).should == nil
end
end
end
describe "in non-blocking mode" do
it "removes an item from the queue" do
q = @object.call
q << Object.new
q.size.should == 1
q.send(@method, true)
q.size.should == 0
end
it "raises a ThreadError if the queue is empty" do
q = @object.call
-> { q.send(@method, true) }.should raise_error(ThreadError)
end
it "removes an item from a closed queue" do
q = @object.call
q << 1
q.close
q.send(@method, true).should == 1
end
it "raises a ThreadError for a closed empty queue" do
q = @object.call
q.close
-> { q.send(@method, true) }.should raise_error(ThreadError)
end
it "converts true-ish non_blocking argument to true" do
q = @object.call
-> { q.send(@method, true) }.should raise_error(ThreadError)
-> { q.send(@method, 1) }.should raise_error(ThreadError)
-> { q.send(@method, "") }.should raise_error(ThreadError)
end
end
end
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