B00tLoad/SnowflakeService
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Alix
2024-05-08 22:44:23 +02:00
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39
.gitignore vendored Normal file
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target/
!.mvn/wrapper/maven-wrapper.jar
!**/src/main/**/target/
!**/src/test/**/target/
### IntelliJ IDEA ###
.idea/
.idea/modules.xml
.idea/jarRepositories.xml
.idea/compiler.xml
.idea/libraries/
*.iws
*.iml
*.ipr
### Eclipse ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
build/
!**/src/main/**/build/
!**/src/test/**/build/
### VS Code ###
.vscode/
### Mac OS ###
.DS_Store

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pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>space.b00tload.services</groupId>
<artifactId>SnowflakeService</artifactId>
<version>1.0-SNAPSHOT</version>
<name>SnowflakeService</name>
<description>A tool/microservice to centrally generate snowflake IDs. Can be run distributed.</description>
<inceptionYear>2024</inceptionYear>
<url>https://github.com/B00tLoad/SnowflakeService</url>
<developers>
<developer>
<id>B00tLoad_</id>
<name>Alix von Schirp</name>
<email>alix.von-schirp@bootmedia.de</email>
<roles>
<role>developer</role>
</roles>
<timezone>Europe/Berlin</timezone>
<properties>
<disordHandle>@b00tload_</disordHandle>
<mastodonhandle>@b00tload_</mastodonhandle>
<mastodoninstance>order-of-gathering.de</mastodoninstance>
<blueskyHandle>@b00tload.space</blueskyHandle>
<pronouns>she/they</pronouns>
</properties>
</developer>
</developers>
<issueManagement>
<system>GitHub</system>
<url>https://github.com/B00tLoad/SnowflakeService/issues</url>
</issueManagement>
<licenses>
<license>
<name>GNU GPL v3.0</name>
<url>https://github.com/B00tLoad/SnowflakeService/blob/master/LICENSE</url>
</license>
</licenses>
<scm>
<connection>scm:git:git://github.com/B00tLoad/SnowflakeService.git</connection>
<developerConnection>scm:git:ssh://github.com:B00tLoad/SnowflakeService.git</developerConnection>
<url>https://github.com/B00tLoad/SnowflakeService</url>
</scm>
<properties>
<maven.compiler.source>21</maven.compiler.source>
<maven.compiler.target>21</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>space.b00tload.utils</groupId>
<artifactId>ConfigurationUtilities</artifactId>
<version>1.0.0</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>2.0.13</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.sonatype.central</groupId>
<artifactId>central-publishing-maven-plugin</artifactId>
<version>0.4.0</version>
<extensions>true</extensions>
<configuration>
<publishingServerId>central</publishingServerId>
<tokenAuth>true</tokenAuth>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>3.3.1</version>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar-no-fork</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>3.6.3</version>
<configuration>
<tags>
<tag>
<name>example</name>
<placement>a</placement>
<head>Usage example:</head>
</tag>
</tags>
</configuration>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-gpg-plugin</artifactId>
<version>3.2.4</version>
<executions>
<execution>
<id>sign-artifacts</id>
<phase>verify</phase>
<goals>
<goal>sign</goal>
</goals>
<configuration>
<keyname>${gpg.keyname}</keyname>
<passphraseServerId>${gpg.keyname}</passphraseServerId>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.7.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<finalName>WatchlistHelper</finalName>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>space.b00tload.services.snowflake.SnowflakeService</mainClass>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
<addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>

73
src/main/java/space/b00tload/services/snowflake/SnowflakeIDGenerator.java Normal file
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package space.b00tload.services.snowflake;
import org.slf4j.LoggerFactory;
public class SnowflakeIDGenerator {
// Constants
private static final long EPOCH = 1704067200000L; // January 1, 2024, 00:00:00 UTC
private static final long MACHINE_ID_BITS = 10L;
private static final long SEQUENCE_BITS = 12L;
private static final long MAX_MACHINE_ID = (1L << MACHINE_ID_BITS) - 1;
private static final long MAX_SEQUENCE = (1L << SEQUENCE_BITS) - 1;
private static final long MACHINE_ID_SHIFT = SEQUENCE_BITS;
private static final long TIMESTAMP_SHIFT = SEQUENCE_BITS + MACHINE_ID_BITS;
// State
private final long machineId;
private long sequence = 0L;
private long lastTimestamp = -1L;
// Constructor
public SnowflakeIDGenerator(long machineId) {
if (machineId < 0 || machineId > MAX_MACHINE_ID) {
throw new IllegalArgumentException("Machine ID must be between 0 and " + MAX_MACHINE_ID);
}
this.machineId = machineId;
}
// Method to generate a new ID
public synchronized long generateID() {
long currentTimestamp = currentTimeMillis();
if (currentTimestamp < lastTimestamp) {
LoggerFactory.getLogger(SnowflakeIDGenerator.class).warn("Clock is moving backwards. Waiting to generate ID.");
while (currentTimestamp < lastTimestamp) {
currentTimestamp = currentTimeMillis();
}
}
if (currentTimestamp == lastTimestamp) {
sequence = (sequence + 1) & MAX_SEQUENCE;
if (sequence == 0) {
currentTimestamp = waitForNextTimestamp(currentTimestamp);
}
} else {
sequence = 0;
}
lastTimestamp = currentTimestamp;
return ((currentTimestamp - EPOCH) << TIMESTAMP_SHIFT)
| (machineId << MACHINE_ID_SHIFT)
| sequence;
}
// Get the current timestamp in milliseconds
private long currentTimeMillis() {
return System.currentTimeMillis();
}
// Wait for the next timestamp
private long waitForNextTimestamp(long currentTimestamp) {
long nextTimestamp = currentTimeMillis();
while (nextTimestamp <= currentTimestamp) {
nextTimestamp = currentTimeMillis();
}
return nextTimestamp;
}
}

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src/main/java/space/b00tload/services/snowflake/SnowflakeService.java Normal file
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package space.b00tload.services.snowflake;
public class SnowflakeService {
public static void main(String[] args) {
}
}