class IO::Endpoint::SharedEndpoint

def self.bound(endpoint, backlog: Socket::SOMAXCONN, close_on_exec: false)
	wrappers = endpoint.bound do |server|
		# This is somewhat optional. We want to have a generic interface as much as possible so that users of this interface can just call it without knowing a lot of internal details. Therefore, we ignore errors here if it's because the underlying socket does not support the operation.
		begin
			server.listen(backlog)
		rescue Errno::EOPNOTSUPP
			# Ignore.
		end
		
		server.close_on_exec = close_on_exec
	end
	
	return self.new(endpoint, wrappers)
end

def self.connected(endpoint, close_on_exec: false)
	wrapper = endpoint.connect
	
	wrapper.close_on_exec = close_on_exec
	
	return self.new(endpoint, [wrapper])
end

def accept(backlog = nil, &block)
	bind do |server|
		server.accept_each(&block)
	end
end

def bind
	@wrappers.each do |server|
		server = server.dup
		
		begin
			yield server
		ensure
			server.close
		end
	end
end

def close
	@wrappers.each(&:close)
	@wrappers.clear
end

def connect
	@wrappers.each do |peer|
		peer = peer.dup
		
		begin
			yield peer
		ensure
			peer.close
		end
	end
end

def initialize(endpoint, wrappers, **options)
	super(**options)
	
	@endpoint = endpoint
	@wrappers = wrappers
end

def local_address_endpoint(**options)
	endpoints = @wrappers.map do |wrapper|
		AddressEndpoint.new(wrapper.to_io.local_address)
	end
	
	return CompositeEndpoint.new(endpoints, **options)
end

def remote_address_endpoint(**options)
	endpoints = @wrappers.map do |wrapper|
		AddressEndpoint.new(wrapper.to_io.remote_address)
	end
	
	return CompositeEndpoint.new(endpoints, **options)
end

def to_s
	"\#<#{self.class} #{@wrappers.size} descriptors for #{@endpoint}>"
end