com.mybatisflex.core.keygen.impl

类 ULIDKeyGenerator

java.lang.Object

com.mybatisflex.core.keygen.impl.ULIDKeyGenerator

所有已实现的接口:

IKeyGenerator

public class ULIDKeyGenerator
extends Object
implements IKeyGenerator

ULID: 对比UUID的优势在于可排序性和性能。

特点： 1、保证 id 生成的顺序为时间顺序，越往后生成的 ID 值越大； 2、可以按照生成的时间进行排序，而不需要全局协调； 3、生成速度快；

参考：Sequence

字段概要

字段

限定符和类型	字段和说明
private static char[]	ENCODING_CHARS
private long	lastRandom
private long	lastTimestamp
private static ThreadLocal<StringBuilder>	THREAD_LOCAL_BUILDER
private static long	TIMESTAMP_OVERFLOW_MASK

构造器概要

构造器

构造器和说明
ULIDKeyGenerator()

方法概要

限定符和类型	方法和说明
private static void	appendCrockford(StringBuilder builder, long value, int count)
private static void	checkTimestamp(long timestamp)
Object	generate(Object entity, String keyColumn)
private String	generateULID(long timestamp)
private String	generateULID(long timestamp, long random)
String	nextId() 生成一个 ULID
String	nextMonotonicId() 生成一个严格单调的 ULID
private long	waitNextMillis(long lastTimestamp)

从类继承的方法 java.lang.Object

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

字段详细资料

ENCODING_CHARS

private static final char[] ENCODING_CHARS

TIMESTAMP_OVERFLOW_MASK

private static final long TIMESTAMP_OVERFLOW_MASK

另请参阅:

常量字段值

THREAD_LOCAL_BUILDER

private static final ThreadLocal<StringBuilder> THREAD_LOCAL_BUILDER

lastTimestamp

private long lastTimestamp

lastRandom

private long lastRandom

构造器详细资料

ULIDKeyGenerator

public ULIDKeyGenerator()

方法详细资料

generate

public Object generate(Object entity,
                       String keyColumn)

指定者:

generate 在接口中 IKeyGenerator

nextId

public String nextId()

生成一个 ULID

返回:

ULID

nextMonotonicId

public String nextMonotonicId()

生成一个严格单调的 ULID

返回:

ULID

generateULID

private String generateULID(long timestamp)

generateULID

private String generateULID(long timestamp,
                            long random)

waitNextMillis

private long waitNextMillis(long lastTimestamp)

appendCrockford

private static void appendCrockford(StringBuilder builder,
                                    long value,
                                    int count)

checkTimestamp

private static void checkTimestamp(long timestamp)