uniquegen

Java based unique ID Generator

How to install with Gradle

Using jitpack

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

dependencies {
    implementation 'com.github.mrppa:uniquegen:<Version>'
}

Maven and more

Version - Refer to releases for the latest version. https://github.com/mrppa/uniquegen/releases

Usage

Syntex

final IDGeneratorContext idGeneratorContext = new ContextBuilder()
                ...
                .build();
                
 final IDGenerator idGenerator = IDGenProvider.getGenerator(<IDProviderType>, idGeneratorContext);
 String generatedId = idGenerator.generateId();

example

final IDGeneratorContext idGeneratorContext = new ContextBuilder()
                .add(DateSequenceIDGenerator.CONTEXT_INSTANCE_ID, "inst1")
                .build();

 final IDGenerator idGenerator = IDGenProvider.getGenerator(GenerateType.DATE_SEQUENCE_BASED, idGeneratorContext);
 String generatedId = idGenerator.generateId(); 

IDProviderType - Type of the id provider

idGeneratorContext - Context with required variables for each type

Refer to each ID Provider types for required context variables

ID provider type

DATE_SEQUENCE_BASED

Generate distributed id based on the instance id, date and a running sequence. Length is 29 digits

Format

[Date][Sequence][Instance id]

Date - Date formatted in yyyyMMddHHmmssSSS . 17 digits

Sequence - A running sequence number . 6 digits left padded. Recycled after every 999,999 records

Instance id - Instance Id left padded . 6 digits

sample id

202212280002261240000010inst1

Example usage

final IDGeneratorContext idGeneratorContext = new ContextBuilder()
                .add(DateSequenceIDGenerator.CONTEXT_INSTANCE_ID, "inst1")
                .build();

 final IDGenerator idGenerator = IDGenProvider.getGenerator(GenerateType.DATE_SEQUENCE_BASED, idGeneratorContext);
 String generatedId = idGenerator.generateId(); 

Context variables

Variable	Desc	Data type	Mandatory
INSTANCE_ID	Instance id of the service	String	No. Default set to 000000

JDBC_SEQUENCE_BASED

Generate sequence backed by JDBC sequences . Length is 24 digits

Format

[Date][Sequence]

Date - Date formatted in yyyyMMddHHmmss . 14 digits

Sequence - database sequence number . 10 digits left padded. Recycled based on the database

sample id

202212291707590000000001

Example usage

final IDGeneratorContext idGeneratorContext = new ContextBuilder()
                .add(DateSequenceIDGenerator.JDBC_DATASOURCE, datasource)
                .add(DateSequenceIDGenerator.SEQUENCE_NAME, "test_sequence")
                .build();

 final IDGenerator idGenerator = IDGenProvider.getGenerator(GenerateType.JDBC_SEQUENCE_BASED, idGeneratorContext);
 String generatedId = idGenerator.generateId(); 

Context variables

Variable	Desc	Data Type	Mandatory
JDBC_DATASOURCE	JDBC datasource object	javax.sql.DataSource	Yes
SEQUENCE_NAME	DB sequence name compatible with JDBC naming conventions	String	No. Value default to uniquegen_jdbc

Supported databases

• PostgreSQL
• MariaDB
• H2

JDBC_TABLE_SEQUENCE_BASED

Generate ids backed by JDBC table . Length is 20 digits

Format

[Sequence]

Sequence - sequence number . 20 digits left padded.

sample id

00000000000000000001

Example usage

final IDGeneratorContext idGeneratorContext = new ContextBuilder()
                .add(JDBCTableSequenceIDGenerator.JDBC_DATASOURCE, dataSource)
                .add(JDBCTableSequenceIDGenerator.SEQUENCE_NAME, "test_Sequence")
                .add(JDBCTableSequenceIDGenerator.CACHE_SIZE, 1000)
                .build();

 final IDGenerator idGenerator = IDGenProvider.getGenerator(GenerateType.JDBC_TABLE_SEQUENCE_BASED, idGeneratorContext);
 String generatedId = idGenerator.generateId(); 

Context variables

Variable	Desc	Data Type	Mandatory
JDBC_DATASOURCE	JDBC datasource object	javax.sql.DataSource	Yes
SEQUENCE_NAME	Sequence name. Maximum 30 characters allowed	String	No. Value default to uniquegen_seq
CACHE_SIZE	Amount of records to be fetched in one time from DB	Integer	No. Value default to 100

Supported databases

• PostgreSQL
• MariaDB
• H2
• MySql

Development/Extention Guideline

• Checkout the repository and open the project with the ide
• gradle build for build the project

Classes

IDGenerator.java

The main interface for any id generation logic.

GenerateType.java

Enum to hold the generated types

IDGenProvider

Factory to return the IDGenerator implementation by GenerateType

BaseIDGeneratorTest

Base unit test to for each IDGenerator implementation

IDGeneratorContext

Hold the context for each generators