Sherlock Distributed Lock

Java Distributed lock library with database migration capabilities

Look for details in the documentation.

supports multiple databases - SQL databases, MongoDB and more
multiple types of locks - multiple ways to acquire a lock: reentrant, single-entrant and more
basic DB migration - provides database migration process based on locks. No need for another library.
synchronous and reactive API - exposes synchronous and reactive API (supports synchronous calls, Reactor, RxJava, Kotlin coroutines)
minimal set of dependencies - the main dependency is a database driver

Sample usage

Add dependency to build.gradle:

dependencies {
  implementation "com.coditory.sherlock:sherlock-mongo:$version"
}

Create synchronous MongoDB backed lock:

// Get mongo collection
// You can also use other DB or reactive API
MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017/sherlock");
MongoCollection<Document> collection = mongoClient
    .getDatabase("sherlock")
    .getCollection("locks");

// Create sherlock
Sherlock sherlock = MongoSherlock.create(collection);

// Create a lock
DistributedLock lock = sherlock.createLock("sample-lock");

// Acquire a lock, run action and finally release the lock
lock.runLocked(() -> System.out.println("Lock granted!"));