package Ġcom . concrete . spring . sender . publisher Ċ Ċ import Ġorg . springframework . cloud . stream . annotation . Output Ċ import Ġorg . springframework . messaging . Message Channel Ċ Ċ interface ĠMessaging Source Ġ{ ĊĠ Ġ@ Output (" message Channel ") ĊĠ Ġfun Ġsender (): ĠMessage Channel Ċ } Ċ