# File lib/snmp/manager.rb, line 48
    def initialize
        @lock = Mutex.new
        @request_id = rand(MAX_REQUEST_ID)
    end

# File lib/snmp/manager.rb, line 61
    def force_next(next_id)
        new_request_id = next_id.to_i
        if new_request_id < 1 || new_request_id >= MAX_REQUEST_ID
            raise "Invalid request id: #{new_request_id}"
        end
        new_request_id = MAX_REQUEST_ID if new_request_id == 1
        @lock.synchronize do
            @request_id = new_request_id - 1
        end
    end

# File lib/snmp/manager.rb, line 53
    def next
        @lock.synchronize do
            @request_id += 1
            @request_id = 1 if @request_id == MAX_REQUEST_ID
            return  @request_id
        end
    end