app.myoss.cloud.sequence.impl

Class RdsSequenceRepository

java.lang.Object

app.myoss.cloud.sequence.impl.RdsSequenceRepository

All Implemented Interfaces:

SequenceLifecycle, SequenceRepository

public class RdsSequenceRepository
extends Object
implements SequenceRepository

使用关系数据库生成序列

Since:

2018年12月16日 下午12:12:06

Author:

Jerry.Chen

Field Summary

Fields

Modifier and Type	Field and Description
static Boolean	DEFAULT_ADJUST 默认自适应开关
static int	DEFAULT_DATA_SOURCE_COUNT 默认数据源个数
static String	DEFAULT_GMT_CREATED_COLUMN_NAME 默认存储序列创建时间的列名
static String	DEFAULT_GMT_MODIFIED_COLUMN_NAME 默认存储序列最后更新时间的列名
static int	DEFAULT_INNER_STEP 默认内步长
static String	DEFAULT_NAME_COLUMN_NAME 默认存储序列名称的列名
static int	DEFAULT_RETRY_TIMES 默认重试次数
static String	DEFAULT_TABLE_NAME 默认序列数据库表名
static String	DEFAULT_VALUE_COLUMN_NAME 默认存储序列值的列名
protected boolean	isInit

Constructor Summary

Constructors

Constructor and Description
RdsSequenceRepository()

Method Summary

Modifier and Type	Method and Description
void	adjust(String name) 检查并调整某个 sequence name 的值
protected boolean	check(int index, long value) 校验值是否正确
void	init() 初始化
protected boolean	isOffState(String groupKey) 检查 groupKey 对象是否已经关闭
SequenceRange	nextRange(String name) 取得下一个可用的序列区间

Methods inherited from class java.lang.Object

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

Methods inherited from interface app.myoss.cloud.sequence.SequenceRepository

getInnerStep

Methods inherited from interface app.myoss.cloud.sequence.SequenceLifecycle

destroy

Field Detail

DEFAULT_INNER_STEP

public static final int DEFAULT_INNER_STEP

默认内步长

See Also:

Constant Field Values

DEFAULT_RETRY_TIMES

public static final int DEFAULT_RETRY_TIMES

默认重试次数

See Also:

Constant Field Values

DEFAULT_TABLE_NAME

public static final String DEFAULT_TABLE_NAME

默认序列数据库表名

See Also:

Constant Field Values

DEFAULT_NAME_COLUMN_NAME

public static final String DEFAULT_NAME_COLUMN_NAME

默认存储序列名称的列名

See Also:

Constant Field Values

DEFAULT_VALUE_COLUMN_NAME

public static final String DEFAULT_VALUE_COLUMN_NAME

默认存储序列值的列名

See Also:

Constant Field Values

DEFAULT_GMT_CREATED_COLUMN_NAME

public static final String DEFAULT_GMT_CREATED_COLUMN_NAME

默认存储序列创建时间的列名

See Also:

Constant Field Values

DEFAULT_GMT_MODIFIED_COLUMN_NAME

public static final String DEFAULT_GMT_MODIFIED_COLUMN_NAME

默认存储序列最后更新时间的列名

See Also:

Constant Field Values

DEFAULT_DATA_SOURCE_COUNT

public static final int DEFAULT_DATA_SOURCE_COUNT

默认数据源个数

See Also:

Constant Field Values

DEFAULT_ADJUST

public static final Boolean DEFAULT_ADJUST

默认自适应开关

isInit

protected volatile boolean isInit

Constructor Detail

RdsSequenceRepository

public RdsSequenceRepository()

Method Detail

init

public void init()

Description copied from interface: SequenceLifecycle

初始化

Specified by:

init in interface SequenceLifecycle

isOffState

protected boolean isOffState(String groupKey)

检查 groupKey 对象是否已经关闭

Parameters:

groupKey - groupKey

Returns:

是否已经关闭

check

protected boolean check(int index,
                        long value)

校验值是否正确

Parameters:

index - group内的序号，从0开始

value - 当前取的值

Returns:

是否正确

adjust

public void adjust(String name)

检查并调整某个 sequence name 的值

 1、如果 sequence 不存在，插入值，并初始化值。
 2、如果已经存在，但有重叠，重新生成。
 3、如果已经存在，且无重叠。
 

Specified by:

adjust in interface SequenceRepository

Parameters:

name - sequence name

nextRange

public SequenceRange nextRange(String name)
                        throws SequenceException

Description copied from interface: SequenceRepository

取得下一个可用的序列区间

Specified by:

nextRange in interface SequenceRepository

Parameters:

name - 序列名称

Returns:

返回下一个可用的序列区间

Throws:

SequenceException - 序列异常信息