# Functions
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Create a publisher with parameters: queue: specify the underlining queue concurrency: specify the worker thread to consume the queue drainTimeout: time to wait for draining the on-hold requests when calling Close() fn: specify the publishing method to call.
# Structs
It is a FIFO queue with the functionality that dropping the front if the queue size reaches to the maxSize.
Publisher is go-routing safe.
# Interfaces
Queue is go-routing safe.