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Description

JetBrains Xodus is a transactional schema-less embedded database that is written in Java. 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.

Code Quality Rank: L3
Programming language: Java
Tags: Database     Cache Store     Nosql    

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README

official JetBrains project Maven Central Last Release TeamCity (build status) License Pure Java + Kotlin Stack Overflow

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.

  • Xodus is transactional and fully ACID-compliant.
  • Xodus is highly concurrent. Reads are completely non-blocking due to MVCC and true 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.
  • Xodus is free and licensed under Apache 2.0.

Hello Worlds!

To start using Xodus, define dependencies:

<!-- in Maven project -->
<dependency>
    <groupId>org.jetbrains.xodus</groupId>
    <artifactId>xodus-openAPI</artifactId>
    <version>1.3.91</version>
</dependency>

// in Gradle project
dependencies {
    compile 'org.jetbrains.xodus:xodus-openAPI:1.3.91'
}

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:1.3.91.

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:1.3.91.

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:1.3.91.

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

Find out More


*Note that all licence references and agreements mentioned in the JetBrains Xodus README section above are relevant to that project's source code only.