Consumers are the element that feeds messages into a component at runtime.
A consumer continually reads messages from a single stream and dispatches them to one or more handlers.
Many consumers can be hosted together in a single service, allowing a component to be fed messages from many streams.
In addition, consumers keep track of its reader's progress through a stream, and controls polling rates, and pre-fetching batches of messages, and the dispatching of messages to handlers.
# Example Consumer
class Consumer include Consumer::Postgres handler SomeHandler handler SomeOtherHandler end