libproto_demo/SnowflakeIdGenerator.hpp

#include <stdint.h>

class SnowflakeIdGenerator {
public:
    SnowflakeIdGenerator(uint32_t workerId, uint32_t machineId)
        : workerId_(workerId), machineId_(machineId), sequence_(0) {}

    uint64_t nextId() {
        static uint64_t timestamp = time(NULL);
        uint64_t id = 0;
        
        // 生成id的计算公式为: Timestamp左移4位 | 机器ID左移20位 | 机器ID右移12位 | 工作ID右移13位 | 序数
        id = (timestamp << 4) | (machineId_ << 20) | (machineId_ >> 12) | (workerId_ >> 13) | sequence_++;
        
        return id;
    }

private:
    uint32_t workerId_;
    uint32_t machineId_;
    uint32_t sequence_;
};