Sync Collections

Provides concurrent thread-safe collections for highly concurrent scenarios in Java 17+.

• BucketSyncMap: A high-performance implementation of ConcurrentMap.

  • Fully compatible with the Java Collections Framework (ConcurrentMap).
  • Delivers up to 2× higher update throughput than ConcurrentHashMap under heavy contention, while matching its performance for reads and other operations.

• ForwardedSyncMap: A performant implementation of ConcurrentMap.

  • Fully compatible with the Java Collections Framework (ConcurrentMap).
  • Delivers up to 2× higher update throughput than ConcurrentHashMap under heavy contention, while being a bit slower in reads and other operations.

Dependency

Sync is available at the Maven Central Repository.

Gradle

dependencies {
  implementation("space.vectrix:sync-collections:1.0.0")
}

Maven

<dependency>
  <groupId>space.vectrix</groupId>
  <artifactId>sync-collections</artifactId>
  <version>1.0.0</version>
</dependency>

Performance

The benchmarks below were recorded on a M4 Macbook Pro.

• SyncMap Benchmarks

Inspiration & Credits

SyncMap draws inspiration from Go’s sync package — particularly its sync.Map and synchronization primitives — to deliver efficient, lock-free behavior in Java.