Open-source alternatives to Stream Lib

Bazel is a multi-language build automation engine designed to manage complex dependency graphs and execute compilation tasks for massive codebases. It functions as a hermetic build environment, utilizing sandboxed execution and content-addressable caching to ensure that build artifacts are reproducible and that identical tasks are never re-executed. By modeling dependencies as a directed acyclic graph, the system determines optimal execution order and identifies tasks that can run in parallel. The project distinguishes itself through its support for distributed build execution, allowing resou

There are lots of good things about working on the JVM, like a world class JIT, operating system threads, and a world class garbage collector. However, one limiting factor can often be the interaction between primitive types and referenced types in Java. Primitive types are the built in types…

Geohash utitlies in java

Apache Spark is a unified distributed data processing engine designed for large-scale data analysis and computation graphs. It functions as a distributed machine learning framework, a graph processing system, a real-time stream processor, and a SQL analytics engine. The system enables the execution of distributed SQL querying, large-scale graph analysis, and real-time stream analytics across clusters of machines. It also provides a scalable environment for implementing machine learning algorithms and predictive model development on massive datasets. The engine incorporates relational query e

High Performance Primitive Collections for Java

A fast object pool for the JVM

Transducers are composable algorithmic transformations. They are independent from the context of their input and output sources and specify only the essence of the transformation in terms of an individual element. Because transducers are decoupled from input or output sources, they can be used…

Library for creating In-memory circular buffers that use direct ByteBuffers to minimize GC overhead

D3 is a modular library providing low-level primitives for creating data-driven visualizations. It functions as a flexible framework that allows for direct control over visual presentation by mapping abstract data dimensions to graphical properties, such as position, color, and size, without imposing predefined chart abstractions. The library distinguishes itself by offering specialized tools for complex data representation, including algorithmic layouts for hierarchical structures and geographic projection utilities for mapping spherical coordinates. It also includes a comprehensive suite fo

Port of LevelDB to Java

Caffeine is a high-performance caching library for the Java virtual machine designed to manage object lifecycles within the application heap. It functions as a thread-safe, memory-resident data store that reduces latency by keeping frequently accessed objects available for immediate retrieval. The library distinguishes itself through a sophisticated eviction strategy that balances recency and frequency to determine which entries to retain. It utilizes a frequency-based admission policy to evaluate the historical access patterns of new data, ensuring that the cache remains populated with the m

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LMDB for Java

Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.

High Scale Lib

/ Written by Gil Tene, based on Apache Harmony version of java.util.HashMap. */

We are pleased to announce that GS Collections has been migrated to the Eclipse Foundation, re-branded as Eclipse Collections.

Reactive Programming for Android

DeepDive

A High Dynamic Range (HDR) Histogram

A Persistent Java Collections Library

Immutable key/value store with efficient space utilization and fast reads. They are ideal for the use-case of tables built by batch processes and shipped to multiple servers.

fast-uuid is a Java library for quickly and efficiently parsing and writing UUIDs. It yields the most dramatic performance gains when compared to Java 8 and older; in benchmarks, it's a little more than fourteen times faster at parsing UUIDs and six times faster at writing UUIDs than the stock…

Failsafe is a JVM resilience library providing a collection of fault tolerance patterns for Java applications. It functions as an asynchronous execution wrapper that runs tasks in the background and returns futures to prevent thread blocking. The library allows for the composition of resilience policies, enabling multiple patterns to be stacked into a sequential pipeline. It includes specific implementations for circuit breaking to prevent system overload, rate limiting to control traffic flow, and a framework for managing retries and fallbacks. Capability areas cover traffic management thro

Java library for the HyperLogLog algorithm