InfoQ Homepage Concurrency Content on InfoQ
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JEP 444: Virtual Threads Arrive in JDK 21, Ushering a New Era of Concurrency
JEP 444, Virtual Threads, was promoted from Candidate to Proposed to Target status for JDK 21. This feature offers a lightweight threading model to simplify the creation, management, and monitoring of high-throughput concurrent Java applications, allowing developers to efficiently handle millions of tasks and make better use of system resources.
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Java 20 Delivers Features for Projects Amber, Loom and Panama
Oracle has released version 20 of the Java programming language and virtual machine with a final feature set that includes seven (7) JEPs. This release features JEPs that provide continued contribution toward Project Amber, Project Loom and Project Panama along with new rounds of preview and incubation.
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AWS Lambda Now Supports Maximum Concurrency for SQS as Event Source
AWS Lambda now provides a way to control the maximum number of concurrent functions invoked by Amazon SQS as an event source. Setting the Maximum Concurrency, developers can determine the concurrency of the functions processing messages in individual SQS queues, simplifying the scalability of serverless applications.
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HC-tree is a High-Concurrency Backend for SQLite Supporting Replication
HC-tree is a project aimed at building a new backend for SQLite specifically optimized for high-concurrency and lead-follower style replication. While still experimental, HC-tree can be used as an SQLite drop-in replacement, albeit with limitations.
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OCaml 5 Brings Support for Concurrency and Shared Memory Parallelism
Several years in the making, OCaml 5 introduces runtime support for shared memory parallelism and effect handlers, which are the basis for exception handling, concurrency, async I/O, and more.
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Java 19 Delivers Features for Projects Loom, Panama and Amber
Oracle has released version 19 of the Java programming language and virtual machine with a final feature set that includes seven JEPs. This release features JEPs that provide continued contribution toward Project Amber, Project Loom and Project Panama along with a new feature that ports the JDK to the Linux/RISC-V instruction set.
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Swift 5.7 Brings New Generics Implementation and Reference Counting Improvements
Announced at WWDC 2022, Swift 5.7 is now officially available. It includes major improvements to the compiler internals, and many syntax and standard library additions, including String regex, concurrency updates, and more.
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Introducing Helidon Níma Using Virtual Threads to Achieve Simplicity and High Performance
Under the umbrella of Project Helidon, Oracle introduced the first microservices framework based on virtual threads (JEP 425) called Helidon Níma. It is built from the ground up to achieve an easy-to-use programming model with outstanding performance. The technology preview is now available with the Helidon 4.0.0-ALPHA1 release for those who are interested in evaluating the latest Java technology.
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JEP 429: Extent-Local Variables to Promote Immutability in Java
JEP 429, Extent-Local Variables (Incubator), was promoted from its JEP Draft 8263012 to Candidate status. This incubating JEP, under the umbrella of Project Loom, proposes enabling the sharing of immutable data within and across threads. This is preferred to thread-local variables, especially when using large numbers of virtual threads.
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JDK 19 and JDK 20: What We Know So Far
JDK 19, the second non-LTS release since JDK 17, has reached its initial release candidate phase with a final set of seven (7) new features, in the form of JEPs, that can be separated into three categories: Core Java Library, Java Specification and Hotspot Compiler. We examine JDK 19 and predict what features may be targeted for JDK 20.
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JEP 428: Structured Concurrency to Simplify Java Multithreaded Programming
JEP 428, Structured Concurrency (Incubator), has been promoted from Proposed to Target to Targeted status for JDK 19. Under the umbrella of Project Loom, this JEP proposes simplifying multithreaded programming by introducing a library to treat multiple tasks running on different threads as an atomic operation. It will streamline error handling, improve reliability, and enhance observability.
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JEP 425: Java Virtual Threads to Deliver Improved Throughput
JEP 425, Virtual Threads (Preview), has been promoted from Proposed to Target to Targeted status for JDK 19. This JEP, under the umbrella of Project Loom, introduces virtual threads. These lightweight threads aim to dramatically reduce the effort of writing, maintaining, and observing high-throughput concurrent applications to the Java platform. This is a preview feature.
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Infer New Deadlock Detector for Android Aims to Be Efficient for Large Codebases
In a joint research, London University College and Facebook researchers created a new deadlock detector for Android Java code now available as part of open-source Infer static analysis tool. The new analyzer is able to process large codebases efficiently thanks to its incremental approach specifically designed for integration in a CI pipeline.
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OCaml 5 Will Include Multicore Support
The OCaml team has announced a detailed roadmap to add multicore support to the language runtime and will focus on merging the multicore and standard runtimes in the next minor releases leading to OCaml 5.
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ZippyDB: the Architecture of Facebook’s Strongly Consistent Key-Value Store
Facebook Engineering recently published how it built its general-purpose key-value store, known as ZippyDB. ZippyDB is Facebook's biggest key-value store, which has been in production for more than six years. It offers flexibility to applications in terms of tunable durability, consistency, availability, and latency guarantees.