local methods = {};

local resolver_mt = { __index = methods };

-- Find the next target to connect to, and

-- pass it to cb()

function methods:next(cb)

	if self.resolvers then

		if not self.resolver then

			if #self.resolvers == 0 then

				cb(nil);

				return;

			end

			local next_resolver = table.remove(self.resolvers, 1);

			self.resolver = next_resolver;

		end

		self.resolver:next(function (...)

			if self.resolver then

				self.last_error = self.resolver.last_error;

			end

			if ... == nil then

				self.resolver = nil;

				self:next(cb);

			else

				cb(...);

			end

		end);

		return;

	end

end

local function new(resolvers)

	return setmetatable({ resolvers = resolvers }, resolver_mt);

end

return {

	new = new;

};