https://github.com/callicoder/java-snowflake

Distributed Unique ID Generator in Java inspired by Twitter Snowflake
https://github.com/callicoder/java-snowflake

distributed-id-generator distributed-sequence-generator id-generator java sequence-generator snowflake unique-id-generator

Last synced: 5 days ago
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Distributed Unique ID Generator in Java inspired by Twitter Snowflake

• Host: GitHub
• URL: https://github.com/callicoder/java-snowflake
• Owner: callicoder
• Created: 2018-11-17T10:29:36.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2020-01-04T07:02:51.000Z (almost 5 years ago)
• Last Synced: 2024-04-11T15:33:48.291Z (7 months ago)
• Topics: distributed-id-generator, distributed-sequence-generator, id-generator, java, sequence-generator, snowflake, unique-id-generator
• Language: Java
• Homepage: https://www.callicoder.com/distributed-unique-id-sequence-number-generator/
• Size: 63.5 KB
• Stars: 154
• Watchers: 9
• Forks: 42
• Open Issues: 3
• Metadata Files:
  • Readme: Readme.md

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README

        
## Java distributed Unique ID generator inspired by Twitter snowflake

You can read about Twitter snowflake [here](https://blog.twitter.com/engineering/en_us/a/2010/announcing-snowflake.html).

The IDs are 64-bits in size and are generated with the combination of the following:

+ **Epoch timestamp in milliseconds precision** - **41 bits**. The maximum timestamp that can be represented using 41 bits is `2^41 - 1`, or `2199023255551`, which comes out to be `Wednesday, September 7, 2039 3:47:35.551 PM`. That gives us 69 years with respect to a custom epoch..

+ **Node ID** - **10 bits**. This gives us 1024 nodes/machines.

+ **Local counter per machine** - **12 bits**. The counter’s max value would be 4095.

## How to use

The `Snowflake` class should be used as a singleton in your application.

```java

Snowflake s = new Snowflake(275)

s.nextId()

```

Read the blog to understand more:

- [Generating unique IDs in a distributed environment at high scale.](https://www.callicoder.com/distributed-unique-id-sequence-number-generator/)