86 lines
2.4 KiB
Java
86 lines
2.4 KiB
Java
package com.ycwl.basic.model.snowFlake;
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import io.swagger.annotations.ApiModelProperty;
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public class UniqueIdMetaData {
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/**
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* 取当前系统启动时间为参考起始时间，
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* 取1995-04-01为参考日
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*/
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// public static final long START_TIME = LocalDateTime.now().toInstant(ZoneOffset.UTC).toEpochMilli();
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public static final long START_TIME = 796665600000L;
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/**
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* 机器ID所占位数
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*/
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@ApiModelProperty(value = "机器位数")
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public static final long MACHINE_ID_BITS = 5L;
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/**
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* 机器ID最大值31，0-31
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*/
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@ApiModelProperty(value = "机器ID最大")
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public static final long MAX_MACHINE_ID = ~(-1L << MACHINE_ID_BITS);
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/**
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* 数据中心ID所占位数
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*/
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@ApiModelProperty(value = "数据中心ID所占位数")
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public static final long DATACENTER_ID_BITS = 5L;
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/**
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* 数据中心ID最大值31，0-31
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*/
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@ApiModelProperty(value = "数据中心ID最大值")
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public static final long MAX_DATACENTER_ID = ~(-1L << MACHINE_ID_BITS);
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/**
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* Sequence所占位数
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*/
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@ApiModelProperty(value = "序列所占位数")
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public static final long SEQUENCE_BITS = 12L;
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/**
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* 机器ID偏移量12
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*/
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@ApiModelProperty(value = "机器ID偏移量")
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public static final long MACHINE_SHIFT_BITS = SEQUENCE_BITS;
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/**
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* 数据中心ID偏移量12+5=17
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*/
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@ApiModelProperty(value = "数据中心ID偏移量")
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public static final long DATACENTER_SHIFT_BITS = SEQUENCE_BITS + MACHINE_ID_BITS;
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/**
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* 时间戳的偏移量12+5+5=22
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*/
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@ApiModelProperty(value = "时间戳偏移量")
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public static final long TIMESTAMP_LEFT_SHIFT_BITS = SEQUENCE_BITS + MACHINE_ID_BITS + DATACENTER_ID_BITS;
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/**
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* Sequence掩码4095
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*/
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@ApiModelProperty(value = "序列掩码")
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public static final long SEQUENCE_MASK = ~(-1L << SEQUENCE_BITS);
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/**
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* 机器ID掩码1023
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*/
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@ApiModelProperty(value = "机器ID掩码")
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public static final long MACHINE_MASK = ~(-1L << MACHINE_ID_BITS);
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/**
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* 数据中心掩码1023
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*/
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@ApiModelProperty(value = "数据中心掩码")
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public static final long DATACENTER_MASK = ~(-1L << MACHINE_ID_BITS);
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/**
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* 时间戳掩码2的41次方减1
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*/
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@ApiModelProperty(value = "时间戳掩码")
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public static final long TIMESTAMP_MASK = ~(-1L << 41L);
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}
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