org.tinygroup.sequence.impl

Class MultipleSequence

java.lang.Object

org.tinygroup.sequence.impl.MultipleSequence

All Implemented Interfaces:

Sequence

public class MultipleSequence
extends Object
implements Sequence

高可用 sequence 序列实现,sequence包含名称、当前值、步长、最小值、最大值、创建时间和修改时间等属性。 采用乐观锁的方式实现从db获取当前sequence段，取完缓存起来，供业务使用

Constructor Summary

Constructors

Constructor and Description
MultipleSequence()
MultipleSequence(MultipleSequenceDao sequenceDao, String sequenceName, long minValue, long maxValue, int innerStep) 在db里如果存在记录的情况下，调用的构造函数,此时不需要再初始化

Method Summary

Modifier and Type	Method and Description
int	getInnerStep()
long	getMaxValue()
long	getMinValue()
MultipleSequenceDao	getSequenceDao()
String	getSequenceName()
void	init() 初始化各个数据源的sequence，如果不存在记录就插入一条到db
long	nextValue() 获取sequence值
void	setInnerStep(int innerStep)
void	setMaxValue(long maxValue)
void	setMinValue(long minValue)
void	setSequenceDao(MultipleSequenceDao sequenceDao)
void	setSequenceName(String name)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MultipleSequence

public MultipleSequence()

MultipleSequence

public MultipleSequence(MultipleSequenceDao sequenceDao,
                        String sequenceName,
                        long minValue,
                        long maxValue,
                        int innerStep)

在db里如果存在记录的情况下，调用的构造函数,此时不需要再初始化

Parameters:

sequenceDao -

sequenceName - 序列名称

innerStep - 内步长

minValue - 最小值

maxValue - 最大值

Method Detail

init

public void init()
          throws SequenceException

初始化各个数据源的sequence，如果不存在记录就插入一条到db

Throws:

SequenceException

nextValue

public long nextValue()
               throws SequenceException

获取sequence值

Specified by:

nextValue in interface Sequence

Returns:

返回序列下一个值

Throws:

SequenceException

getSequenceDao

public MultipleSequenceDao getSequenceDao()

setSequenceDao

public void setSequenceDao(MultipleSequenceDao sequenceDao)

getSequenceName

public String getSequenceName()

setSequenceName

public void setSequenceName(String name)

getInnerStep

public int getInnerStep()

setInnerStep

public void setInnerStep(int innerStep)

getMinValue

public long getMinValue()

setMinValue

public void setMinValue(long minValue)

getMaxValue

public long getMaxValue()

setMaxValue

public void setMaxValue(long maxValue)