▁hosts ▁service ▁producer ▁and ▁consumer ▁components . ▁Services ▁connect ▁to ▁the ▁container ▁via ▁binding ▁components ▁( BC ) ▁or ▁can ▁be ▁hosted ▁inside ▁the ▁container ▁as ▁part ▁of ▁a ▁service ▁engine ▁( SE ). ▁The ▁services ▁model ▁used ▁is ▁Web ▁Services ▁Description ▁Language ▁ 2 . 0 . ▁The ▁central ▁message ▁delivery ▁mechanism , ▁the ▁normal ized ▁message ▁router ▁( N MR ), ▁del ivers ▁normal ized ▁messages ▁via ▁one ▁of ▁four ▁Message ▁Exchange ▁Pattern s ▁( ME P s ), ▁taken ▁from ▁W SD L ▁ 2 . 0 : ▁ ▁In - Only : ▁A ▁standard ▁one - way ▁mess aging ▁exchange ▁where ▁the ▁consumer ▁sends ▁a ▁message ▁to ▁the ▁provider ▁that ▁provides ▁only ▁a ▁status ▁response . ▁ ▁Rob ust ▁In - Only : ▁This ▁pattern ▁is ▁for ▁reliable ▁one - way ▁message ▁ex changes . ▁The ▁consumer ▁initi ates ▁with ▁a ▁message ▁to ▁which ▁the ▁provider ▁respond s ▁with ▁status . ▁If ▁the ▁response ▁is ▁a ▁status , ▁the ▁exchange ▁is ▁complete , ▁but ▁if ▁the ▁response ▁is ▁a ▁fault , ▁the ▁consumer ▁must ▁respond ▁with ▁a ▁status . ▁ ▁In - Out : ▁A ▁standard ▁two - way ▁message ▁exchange ▁where ▁the ▁consumer ▁initi ates ▁with ▁a ▁message , ▁the ▁provider ▁respond s ▁with ▁a ▁message ▁or ▁fault ▁and ▁the ▁consumer ▁respond s ▁with ▁a ▁status . ▁ ▁In ▁Optional - Out : ▁A ▁standard ▁two - way ▁message ▁exchange ▁where ▁the ▁provider ' s ▁response ▁is ▁optional . ▁ ▁To ▁handle ▁functionality ▁that ▁de als ▁with ▁installation