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公共子模块common模块entry、utils包代码以及分布式

公共子模块common模块entry、utils包代码以及分布式

作者: 神豪VS勇士赢 | 来源:发表于2019-02-23 10:58 被阅读0次

一、上文我们已经完成了创建common子模块
接下来我们在里面创建返回实体类
新建 entry包

image.png
在包下面创建 Result类 用于控制器返回结果:
public class Result {
/**
* 是否成功
/
private boolean flag;
/
*
* 返回码
/
private Integer code;
/
*
* 返回信息
/
private String message;
/
*
* 返回数据
*/
private Object data;
public Result() {
}

public Result(boolean flag, Integer code, String message) {
    this.flag = flag;
    this.code = code;
    this.message = message;
}

public Result(boolean flag, Integer code, String message, Object data) {
    this.flag = flag;
    this.code = code;
    this.message = message;
    this.data = data;
}

public boolean isFlag() {
    return flag;
}

public void setFlag(boolean flag) {
    this.flag = flag;
}

public Integer getCode() {
    return code;
}

public void setCode(Integer code) {
    this.code = code;
}

public String getMessage() {
    return message;
}

public void setMessage(String message) {
    this.message = message;
}

public Object getData() {
    return data;
}

public void setData(Object data) {
    this.data = data;
}

这里面我们使用很原始的set get 也可以使用lombook 通过注释来完成 实体的一些操作。

接下来创建分页结果类:

public class PageResult <T>{
private Long total;
private List<T> rows;

public PageResult() {
}

public PageResult(Long total, List<T> rows) {
    this.total = total;
    this.rows = rows;
}

public Long getTotal() {
    return total;
}

public void setTotal(Long total) {
    this.total = total;
}

public List<T> getRows() {
    return rows;
}

public void setRows(List<T> rows) {
    this.rows = rows;
}

}
接下来 创建状态码实体类 :
public class StatusCode {
/**
* 成功
/
public static final int OK=20000;
/
*
* 失败
/
public static final int ERROR =20001;
/
*
* 用户名或密码错误
/
public static final int LOGINERROR =20002;
/
*
* 权限不足
/
public static final int ACCESSERROR =20003;
/
*
* 远程调用失败
/
public static final int REMOTEERROR =20004;
/
*
* 重复操作
/
public static final int REPERROR =20005;
/
*
* 验证码过期
*/
public static final int VERIFICATION =20006;
}

接下来我们需要解除一个新的分布式的ID生成器:


image.png
image.png

在 comnon包下创建 util包


image.png

IdWorker 代码如下: 我们直接引用这个代码 直接来使用:
package util;

import java.lang.management.ManagementFactory;
import java.net.InetAddress;
import java.net.NetworkInterface;

/**

  • <p>名称:IdWorker.java</p>

  • <p>描述:分布式自增长ID</p>

  • <pre>

  • Twitter的 Snowflake JAVA实现方案
    
  • </pre>

  • 核心代码为其IdWorker这个类实现,其原理结构如下,我分别用一个0表示一位,用—分割开部分的作用:

  • 1||0---0000000000 0000000000 0000000000 0000000000 0 --- 00000 ---00000 ---000000000000

  • 在上面的字符串中,第一位为未使用(实际上也可作为long的符号位),接下来的41位为毫秒级时间,

  • 然后5位datacenter标识位,5位机器ID(并不算标识符,实际是为线程标识),

  • 然后12位该毫秒内的当前毫秒内的计数,加起来刚好64位,为一个Long型。

  • 这样的好处是,整体上按照时间自增排序,并且整个分布式系统内不会产生ID碰撞(由datacenter和机器ID作区分),

  • 并且效率较高,经测试,snowflake每秒能够产生26万ID左右,完全满足需要。

  • <p>

  • 64位ID (42(毫秒)+5(机器ID)+5(业务编码)+12(重复累加))

  • @author Polim
    /
    public class IdWorker {
    /
    *

    • 时间起始标记点,作为基准,一般取系统的最近时间(一旦确定不能变动)
      /
      private final static long twepoch = 1288834974657L;
      /
      *
    • 机器标识位数
      /
      private final static long workerIdBits = 5L;
      /
      *
    • 数据中心标识位数
      /
      private final static long datacenterIdBits = 5L;
      /
      *
    • 机器ID最大值
      /
      private final static long maxWorkerId = -1L ^ (-1L << workerIdBits);
      /
      *
    • 数据中心ID最大值
      /
      private final static long maxDatacenterId = -1L ^ (-1L << datacenterIdBits);
      /
      *
    • 毫秒内自增位
      /
      private final static long sequenceBits = 12L;
      /
      *
    • 机器ID偏左移12位
      /
      private final static long workerIdShift = sequenceBits;
      /
      *
    • 数据中心ID左移17位
      /
      private final static long datacenterIdShift = sequenceBits + workerIdBits;
      /
      *
    • 时间毫秒左移22位
      */
      private final static long timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits;

    private final static long sequenceMask = -1L ^ (-1L << sequenceBits);
    /**

    • 上次生产id时间戳
      /
      private static long lastTimestamp = -1L;
      /
      *
    • 0,并发控制
      /
      private long sequence = 0L;
      /
      *
    • 工作机器ID
      /
      private final long workerId;
      /
      *
    • 数据标识id部分
      */
      private final long datacenterId;

    public IdWorker() {
    this.datacenterId = getDatacenterId(maxDatacenterId);
    this.workerId = getMaxWorkerId(datacenterId, maxWorkerId);
    }

    /**

    • @param workerId 工作机器ID
    • @param datacenterId 序列号
      */
      public IdWorker(long workerId, long datacenterId) {
      if (workerId > maxWorkerId || workerId < 0) {
      throw new IllegalArgumentException(String.format("worker Id can't be greater than %d or less than 0", maxWorkerId));
      }
      if (datacenterId > maxDatacenterId || datacenterId < 0) {
      throw new IllegalArgumentException(String.format("datacenter Id can't be greater than %d or less than 0", maxDatacenterId));
      }
      this.workerId = workerId;
      this.datacenterId = datacenterId;
      }

    /**

    • 获取下一个ID

    • @return
      */
      public synchronized long nextId() {
      long timestamp = timeGen();
      if (timestamp < lastTimestamp) {
      throw new RuntimeException(String.format("Clock moved backwards. Refusing to generate id for %d milliseconds", lastTimestamp - timestamp));
      }

      if (lastTimestamp == timestamp) {
      // 当前毫秒内,则+1
      sequence = (sequence + 1) & sequenceMask;
      if (sequence == 0) {
      // 当前毫秒内计数满了,则等待下一秒
      timestamp = tilNextMillis(lastTimestamp);
      }
      } else {
      sequence = 0L;
      }
      lastTimestamp = timestamp;
      // ID偏移组合生成最终的ID,并返回ID
      long nextId = ((timestamp - twepoch) << timestampLeftShift)
      | (datacenterId << datacenterIdShift)
      | (workerId << workerIdShift) | sequence;

      return nextId;
      }

    private long tilNextMillis(final long lastTimestamp) {
    long timestamp = this.timeGen();
    while (timestamp <= lastTimestamp) {
    timestamp = this.timeGen();
    }
    return timestamp;
    }

    private long timeGen() {
    return System.currentTimeMillis();
    }

    /**

    • <p>
    • 获取 maxWorkerId
    • </p>
      /
      protected static long getMaxWorkerId(long datacenterId, long maxWorkerId) {
      StringBuffer mpid = new StringBuffer();
      mpid.append(datacenterId);
      String name = ManagementFactory.getRuntimeMXBean().getName();
      if (!name.isEmpty()) {
      /

      * GET jvmPid
      /
      mpid.append(name.split("@")[0]);
      }
      /
      • MAC + PID 的 hashcode 获取16个低位
        */
        return (mpid.toString().hashCode() & 0xffff) % (maxWorkerId + 1);
        }

    /**

    • <p>
    • 数据标识id部分
    • </p>
      */
      protected static long getDatacenterId(long maxDatacenterId) {
      long id = 0L;
      try {
      InetAddress ip = InetAddress.getLocalHost();
      NetworkInterface network = NetworkInterface.getByInetAddress(ip);
      if (network == null) {
      id = 1L;
      } else {
      byte[] mac = network.getHardwareAddress();
      id = ((0x000000FF & (long) mac[mac.length - 1])
      | (0x0000FF00 & (((long) mac[mac.length - 2]) << 8))) >> 6;
      id = id % (maxDatacenterId + 1);
      }
      } catch (Exception e) {
      System.out.println(" getDatacenterId: " + e.getMessage());
      }
      return id;
      }

}

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