Implementation of {@link CompositeMessageSource} that propagates both injection of {@link FlowConstruct}and lifecycle to nested {@link MessageSource}s.
This message source cannot be started without a listener set.
If sources are added when this composie is started they will be started as well.
If a {@link MessageSource} is started in isolation when composite is stopped then messages will belost.
Message will only be received from endpoints if the connector is also started.
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