com.pig4cloud.pigx.common.sequence.range.SeqRange Maven / Gradle / Ivy
package com.pig4cloud.pigx.common.sequence.range;
import java.util.concurrent.atomic.AtomicLong;
/**
* 序列号区间对象模型
*
* @author xuan on 2018/1/10.
*/
public class SeqRange {
/**
* 区间的序列号开始值
*/
private final long min;
/**
* 区间的序列号结束值
*/
private final long max;
/**
* 区间的序列号当前值
*/
private final AtomicLong value;
/**
* 区间的序列号是否分配完毕，每次分配完毕就会去重新获取一个新的区间
*/
private volatile boolean over = false;
public SeqRange(long min, long max) {
this.min = min;
this.max = max;
this.value = new AtomicLong(min);
}
/**
* 返回并递增下一个序列号
* @return 下一个序列号，如果返回-1表示序列号分配完毕
*/
public long getAndIncrement() {
long currentValue = value.getAndIncrement();
if (currentValue > max) {
over = true;
return -1;
}
return currentValue;
}
public long getMin() {
return min;
}
public long getMax() {
return max;
}
public boolean isOver() {
return over;
}
public void setOver(boolean over) {
this.over = over;
}
@Override
public String toString() {
return "max: " + max + ", min: " + min + ", value: " + value;
}
}