https://jetbrains.github.io/xodus

Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.
https://jetbrains.github.io/xodus

database db embedded-database entity-store java key-value kotlin log-structured nosql schema-less snapshot-isolation transactional xodus youtrack

Last synced: about 1 month ago
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Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.

• Host: GitHub
• URL: https://jetbrains.github.io/xodus
• Owner: JetBrains
• License: apache-2.0
• Created: 2014-04-29T09:36:04.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2024-10-23T12:37:41.000Z (2 months ago)
• Last Synced: 2024-10-29T14:55:27.543Z (about 2 months ago)
• Topics: database, db, embedded-database, entity-store, java, key-value, kotlin, log-structured, nosql, schema-less, snapshot-isolation, transactional, xodus, youtrack
• Language: Java
• Homepage:
• Size: 34.9 MB
• Stars: 1,182
• Watchers: 64
• Forks: 109
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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# 

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JetBrains Xodus is a transactional schema-less embedded database that is written in Java and [Kotlin](https://kotlinlang.org).

It was initially developed for [JetBrains YouTrack](https://jetbrains.com/youtrack), an issue tracking and project

management tool. Xodus is also used in [JetBrains Hub](https://jetbrains.com/hub), the user management platform

for JetBrains' team tools, and in some internal JetBrains projects.

- Xodus is transactional and fully ACID-compliant.

- Xodus is highly concurrent. Reads are completely non-blocking due to [MVCC](https://en.wikipedia.org/wiki/Multiversion_concurrency_control) and

true [snapshot isolation](https://en.wikipedia.org/wiki/Snapshot_isolation).

- Xodus is schema-less and agile. It does not require schema migrations or refactorings.

- Xodus is embedded. It does not require installation or administration.

- Xodus is written in pure Java and [Kotlin](https://kotlinlang.org).

- Xodus is free and licensed under [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0.html).

## Hello Worlds!

To start using Xodus, define dependencies:

```xml

    org.jetbrains.xodus

    xodus-openAPI

    2.0.1

```

```kotlin

// in Gradle project

dependencies {

    implementation("org.jetbrains.xodus:xodus-openAPI:2.0.1")

}

```

Read more about [managing dependencies](https://github.com/JetBrains/xodus/wiki/Managing-Dependencies).

There are two different ways to deal with data, which results in two different API layers: [Environments](https://github.com/JetBrains/xodus/wiki/Environments) and [Entity Stores](https://github.com/JetBrains/xodus/wiki/Entity-Stores).

 

### Environments

Add dependency on `org.jetbrains.xodus:xodus-environment:2.0.1`.

```java

try (Environment env = Environments.newInstance("/home/me/.myAppData")) {

    env.executeInTransaction(txn -> {

        final Store store = env.openStore("Messages", StoreConfig.WITHOUT_DUPLICATES, txn);

        store.put(txn, StringBinding.stringToEntry("Hello"), StringBinding.stringToEntry("World!"));

    });

}

```

### Entity Stores

Add dependency on `org.jetbrains.xodus:xodus-entity-store:2.0.1`, `org.jetbrains.xodus:xodus-environment:2.0.1` and `org.jetbrains.xodus:xodus-vfs:2.0.1`.

```java

try (PersistentEntityStore entityStore = PersistentEntityStores.newInstance("/home/me/.myAppData")) {

    entityStore.executeInTransaction(txn -> {

        final Entity message = txn.newEntity("Message");

        message.setProperty("hello", "World!");

    });

}

```

## Building from Source

[Gradle](https://www.gradle.org) is used to build, test, and publish. JDK 1.8 or higher is required. To build the project, run:

    ./gradlew build

To assemble JARs and skip running tests, run:

    ./gradlew assemble

## Find out More

- [Xodus wiki](https://github.com/JetBrains/xodus/wiki)

- [Report an issue](https://youtrack.jetbrains.com/issues/XD)