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JetBrains Xodus is a transactional schema-less embedded database that is written in Java and Kotlin. It was initially developed for JetBrains YouTrack, an issue tracking and project management tool. Xodus is also used in JetBrains Hub, the user management platform for JetBrains' team tools, and in some internal JetBrains projects.

Hello Worlds!

To start using Xodus, define dependencies:

<!-- in Maven project -->
<dependency>
    <groupId>org.jetbrains.xodus</groupId>
    <artifactId>xodus-openAPI</artifactId>
    <version>1.3.232</version>
</dependency>
// in Gradle project
dependencies {
    compile 'org.jetbrains.xodus:xodus-openAPI:1.3.232'
}

Read more about managing dependencies.

There are three different ways to deal with data, which results in three different API layers: Environments, Entity Stores and Virtual File Systems.

Environments

Add dependency on org.jetbrains.xodus:xodus-environment:1.3.232.

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:1.3.232.

try (PersistentEntityStore entityStore = PersistentEntityStores.newInstance("/home/me/.myAppData")) {
    entityStore.executeInTransaction(txn -> {
        final Entity message = txn.newEntity("Message");
        message.setProperty("hello", "World!");
    });
}

Virtual File Systems

Add dependency on org.jetbrains.xodus:xodus-vfs:1.3.232.

try (Environment env = Environments.newInstance("/home/me/.myAppData")) {
    final VirtualFileSystem vfs = new VirtualFileSystem(env);
    env.executeInTransaction(txn -> {
        final File file = vfs.createFile(txn, "Messages");
        try (DataOutputStream output = new DataOutputStream(vfs.writeFile(txn, file))) {
            output.writeUTF("Hello ");
            output.writeUTF("World!");
        } catch (IOException e) {
            throw new ExodusException(e);
        }
    });
    vfs.shutdown();
}

Building from Source

Gradle is used to build, test, and publish. JDK 1.8 is required. To build the project, run:

./gradlew build

To assemble JARs and skip running tests, run:

./gradlew assemble

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