### Set JAVA_HOME and MAVEN_HOME

Source: https://github.com/baidu/uid-generator/blob/master/README.md

Set the JAVA_HOME and MAVEN_HOME environment variables. Ensure the Maven bin directory is added to your PATH.

```shell
export MAVEN_HOME=/xxx/xxx/software/maven/apache-maven-3.3.9
export PATH=$MAVEN_HOME/bin:$PATH
JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home";
export JAVA_HOME;
```

--------------------------------

### Mybatis Configuration for UID Generator

Source: https://github.com/baidu/uid-generator/blob/master/README.md

This XML configuration sets up Mybatis components including component scanning, SQL session factory, transaction management, mapper scanning, and data source configuration using Druid.

```xml
<!-- Spring annotation scan -->
<context:component-scan base-package="com.baidu.fsg.uid" />

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="mapperLocations" value="classpath:/META-INF/mybatis/mapper/M_WORKER*.xml" />
</bean>

<!-- transaction -->
<tx:annotation-driven transaction-manager="transactionManager" order="1" />

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
	<property name="dataSource" ref="dataSource" />
</bean>

<!-- Mybatis Mapper scan -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
	<property name="annotationClass" value="org.springframework.stereotype.Repository" />
	<property name="basePackage" value="com.baidu.fsg.uid.worker.dao" />
	<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
</bean>

<!-- datasource config -->
<bean id="dataSource" parent="abstractDataSource">
	<property name="driverClassName" value="${mysql.driver}" />
	<property name="maxActive" value="${jdbc.maxActive}" />
	<property name="url" value="${jdbc.url}" />
	<property name="username" value="${jdbc.username}" />
	<property name="password" value="${jdbc.password}" />
</bean>

<bean id="abstractDataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
	<property name="filters" value="${datasource.filters}" />
	<property name="defaultAutoCommit" value="${datasource.defaultAutoCommit}" />
	<property name="initialSize" value="${datasource.initialSize}" />
	<property name="minIdle" value="${datasource.minIdle}" />
	<property name="maxWait" value="${datasource.maxWait}" />
	<property name="testWhileIdle" value="${datasource.testWhileIdle}" />
	<property name="testOnBorrow" value="${datasource.testOnBorrow}" />
	<property name="testOnReturn" value="${datasource.testOnReturn}" />
	<property name="validationQuery" value="${datasource.validationQuery}" />
	<property name="timeBetweenEvictionRunsMillis" value="${datasource.timeBetweenEvictionRunsMillis}" />
	<property name="minEvictableIdleTimeMillis" value="${datasource.minEvictableIdleTimeMillis}" />
	<property name="logAbandoned" value="${datasource.logAbandoned}" />
	<property name="removeAbandoned" value="${datasource.removeAbandoned}" />
	<property name="removeAbandonedTimeout" value="${datasource.removeAbandonedTimeout}" />
</bean>

<bean id="batchSqlSession" class="org.mybatis.spring.SqlSessionTemplate">
	<constructor-arg index="0" ref="sqlSessionFactory" />
	<constructor-arg index="1" value="BATCH" />
</bean>
```

--------------------------------

### Generate and Parse UID with CachedUidGeneratorTest

Source: https://github.com/baidu/uid-generator/blob/master/README.md

This Java code demonstrates how to generate a unique ID using the UidGenerator and then parse it back into its components: timestamp, worker ID, and sequence number. Ensure the UidGenerator is properly injected.

```java
@Resource
private UidGenerator uidGenerator;

@Test
public void testSerialGenerate() {
    // Generate UID
    long uid = uidGenerator.getUID();

    // Parse UID into [Timestamp, WorkerId, Sequence]
    // {"UID":"180363646902239241","parsed":{    "timestamp":"2017-01-19 12:15:46",    "workerId":"4",    "sequence":"9"        }}
    System.out.println(uidGenerator.parseUID(uid));

}
```

--------------------------------

### Spring Configuration for CachedUidGenerator

Source: https://github.com/baidu/uid-generator/blob/master/README.md

Spring bean definition for the CachedUidGenerator, recommended for performance-sensitive applications. Includes options for buffer size, padding, and rejection policies.

```xml
<!-- CachedUidGenerator -->
<bean id="cachedUidGenerator" class="com.baidu.fsg.uid.impl.CachedUidGenerator">
    <property name="workerIdAssigner" ref="disposableWorkerIdAssigner" />
 
    <!-- The config below is option -->
    <!-- Specified bits & epoch as your demand. No specified the default value will be used -->
    <property name="timeBits" value="29"/>
    <property name="workerBits" value="21"/>
    <property name="seqBits" value="13"/>
    <property name="epochStr" value="2016-09-20"/>
    <!-- RingBuffer size, to improve the throughput. -->
    <!-- Default as 3. Sample: original bufferSize=8192, after boosting the new bufferSize= 8192 << 3 = 65536 -->
    <property name="boostPower" value="3"></property>
 
    <!-- In-time padding, available UIDs percentage(0, 100) of the RingBuffer, default as 50 -->
    <!-- Sample: bufferSize=1024, paddingFactor=50 -> threshold=1024 * 50 / 100 = 512. -->
    <!-- When the rest available UIDs < 512, RingBiffer will be padded in-time -->
    <property name="paddingFactor" value="50"></property>
 
    <!-- Periodic padding -->
    <!-- Default is disabled. Enable as below, scheduleInterval unit as Seconds. -->
    <property name="scheduleInterval" value="60"></property>
 
    <!-- Policy for rejecting put on RingBuffer -->
    <property name="rejectedPutBufferHandler" ref="XxxxYourPutRejectPolicy"></property>
 
    <!-- Policy for rejecting take from RingBuffer -->
    <property name="rejectedTakeBufferHandler" ref="XxxxYourTakeRejectPolicy"></property>

</bean>
 
<!-- Disposable WorkerIdAssigner based on Database -->
<bean id="disposableWorkerIdAssigner" class="com.baidu.fsg.uid.worker.DisposableWorkerIdAssigner" />
 
<!-- Mybatis config... -->
```

--------------------------------

### Create WORKER_NODE Table SQL

Source: https://github.com/baidu/uid-generator/blob/master/README.md

SQL script to create the WORKER_NODE table in a MySQL database. Ensure to replace 'xxxx' with your actual database name.

```sql
DROP DATABASE IF EXISTS `xxxx`;
CREATE DATABASE `xxxx` ;
use `xxxx`;
DROP TABLE IF EXISTS WORKER_NODE;
CREATE TABLE WORKER_NODE
(
ID BIGINT NOT NULL AUTO_INCREMENT COMMENT 'auto increment id',
HIST_NAME VARCHAR(64) NOT NULL COMMENT 'host name',
PORT VARCHAR(64) NOT NULL COMMENT 'port',
TYPE INT NOT NULL COMMENT 'node type: ACTUAL or CONTAINER',
LAUNCH_DATE DATE NOT NULL COMMENT 'launch date',
MODIFIED TIMESTAMP NOT NULL COMMENT 'modified time',
CREATED TIMESTAMP NOT NULL COMMENT 'created time',
PRIMARY KEY(ID)
)
 COMMENT='DB WorkerID Assigner for UID Generator',ENGINE = INNODB;
```

--------------------------------

### Spring Configuration for DefaultUidGenerator

Source: https://github.com/baidu/uid-generator/blob/master/README.md

Spring bean definition for the DefaultUidGenerator. Configure 'workerIdAssigner' and optionally 'timeBits', 'workerBits', 'seqBits', and 'epochStr' as needed.

```xml
<!-- DefaultUidGenerator -->
<bean id="defaultUidGenerator" class="com.baidu.fsg.uid.impl.DefaultUidGenerator" lazy-init="false">
    <property name="workerIdAssigner" ref="disposableWorkerIdAssigner"/>

    <!-- Specified bits & epoch as your demand. No specified the default value will be used -->
    <property name="timeBits" value="29"/>
    <property name="workerBits" value="21"/>
    <property name="seqBits" value="13"/>
    <property name="epochStr" value="2016-09-20"/>
</bean>
 
<!-- Disposable WorkerIdAssigner based on Database -->
<bean id="disposableWorkerIdAssigner" class="com.baidu.fsg.uid.worker.DisposableWorkerIdAssigner" />
```

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