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Snowflake 循环等待下一个时间时加入对时钟倒退的判断

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Snowflake 在循环等待下一个时间时，判断时间未发生变化的方式由<=改为==，避免了时钟突然倒退导致的长时间循环，同时加入时钟倒退检测，避免生成重复ID
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jptx1234 2020-05-17 23:29:43 +08:00
parent 9440512d54
commit a3eca85e12
1 changed files with 7 additions and 1 deletions
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8
hutool-core/src/main/java/cn/hutool/core/lang/Snowflake.java
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@ -177,9 +177,15 @@ public class Snowflake implements Serializable {
*/
private long tilNextMillis(long lastTimestamp) {
long timestamp = genTime();
while (timestamp <= lastTimestamp) {
// 循环直到操作系统时间戳变化
while (timestamp == lastTimestamp) {
timestamp = genTime();
}
if (timestamp < lastTimestamp) {
// 如果发现新的时间戳比上次记录的时间戳数值小，说明操作系统时间发生了倒退，报错
throw new IllegalStateException(
StrUtil.format("Clock moved backwards. Refusing to generate id for {}ms", lastTimestamp - timestamp));
}
return timestamp;
}