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Loom is going to leapfrog it and remove pretty much all downsides. Developer Advocate with 15+ years experience consulting for many different customers, in a wide range of contexts . Usually working on Java/Java EE and Spring technologies, but with focused interests like Rich Internet Applications, Testing, CI/CD and DevOps.

project loom vs reactive

When to use are obvious in textbook examples; a little less so in deeply nested logic. Lock avoidance makes that, for the most part, go away, and be limited to contended leaf components like malloc(). With Loom, we write synchronous code, and let someone else decide what to do when blocked. And debugging is indeed painful, and if one of the intermediary stages results with an exception, the control-flow goes hay-wire, resulting in further code to handle it. This thread would collect the information from an incoming request, spawn a CompletableFuture, and chain it with a pipeline . Each one is a stage, and the resultant CompletablFuture is returned back to the web-framework.

Concurrency allows Golang to support a large number of connections simultaneously. Its application on the Internet of Things projects promises to overcome the setbacks of integrating IoT applications with multiple IoT devices. With real-time remote monitoring through IoT apps today, it is possible to create smart homes, factories, and many other smart products. Server-side languages like Go and Java are used for back-end development tasks like database management and building application programming interfaces. Golang vs. Java compare and contrast two notoriously fast, back-end programming languages that can take your latest software project to the next level. Is it possible to combine some desirable characteristics of the two worlds?


On their side, JetBrains has advertised Kotlin’s coroutines as being the easiest way to run code in parallel. This repository contains an experiment that uses a Spring Boot application with Virtual Threads. That would be a very naive implementation of this concept. A more realistic one would strive for collecting from a dynamic pool which kept one real thread for every blocked system call + one for every real CPU. At least that is what the folks behind Go came up with.

Those who know Clojure or Kotlin probably feel reminded of “coroutines” (and if you’ve heard of Flix, you might think of “processes”). Those are technically very similar and address the same problem. However, there’s at least one small but interesting difference from a developer’s perspective. For coroutines, there are special keywords in the respective languages (in Clojure a macro for a “go block”, in Kotlin the “suspend” keyword).

Be as effective as asynchronous or reactive programming, but in a way that one can program in the familiar, sequential command sequence? Oracle’s Project Loom aims to explore exactly this option with a modified JDK. It brings a new lightweight construct for concurrency, named virtual threads. The improvements that Project Loom brings are exciting. We have reduced the number of threads by a factor of 5.

Brian Goetz: “i Think Project Loom Is Going To Kill Reactive Programming”

That actually helped a lot, but of course it only matters when you’re running code in a debugger; trying to read that style of code is still incredibly painful most of the time. The above model works well in legacy scenarios, but not so well in web ones. Imagine a web server that needs to respond to an HTTP request. In the not-so-good-old-time, CGI was one way to handle requests.

project loom vs reactive

Rust is cool for memory management and why not low level development like in Linux kernel. But it’s way more complicated than Go to develop such http service. So, creating one for your Golang projects is incredibly beneficial as you would get the feel of creating a real-time application that can be used at an enterprise level. Turing’s automated platform lets companies “push a button” to hire senior, pre-vetted remote software developers. You can access a talent pool of the top 1% of 1M+ developers with strong technical and communication skills who work in their time zone. They, therefore, created a language that would achieve a superb blend of the advantages of different languages to function better.

On the opposite, after having invested so much effort in their respective frameworks, they decide to continue as if nothing happened. For example, the Spring framework took care of actually designing a shared Reactive API called Reactive Streams, with no Spring dependencies. There are currently two implementations, RxJava v2 and Pivotal’s Project Reactor.

Reactive extensions, observables, reactive streams, actors, and much more have changed the way JVM programmers build applications. When I said control over concurrency, I just stated the fact that Rust offers more control on that area than Go. So for me this is not from a fanboy standpoint but more from a user who finds one product better than other. I’m not married to Rust or Go, if there is a new language that is better than Rust i’ll sing praise of that in a heartbeat. Moreover, since Contentful lacks an officially supported Golang software development kit, a developer must write complex code to parse data from Contentful. The developer may have to rely on third-party libraries, which may cause inconveniences.

Project Loom And Virtual Threads

In this article, we will try to introduce you to the benefits of Java and Golang from a business perspective. But before moving on to the differences, let’s look into the features that Java and Golang share in common. We’re big fans of Go at, so much so that we’ve created several courses to help you learn Go! No matter your skill level, our Learn Go coursewill get you the skills you need to work as a Go programmer. So now we can start a million threads at the same time.

Loom is more about a native concurrency abstraction, which additionally helps one write asynchronous code. Given its a VM level abstraction, rather than just code level , It lets one implement asynchronous behavior but with reduce boiler plate. To give some context here, I have been following Project Loom for some time now. I’ve never done it in Java but it’s absolute hell in C++. And it was so bad I’m JavaScript that they eventually added special support in the Chromium debugger to reconstruct stack traces across callback boundaries .

This cross-platform runtime environment for JavaScript aids in the development of networking and server-side applications. In the same survey, programmers ranked Golang 5th for the most loved programming language, whereas C++ sits at number 8 for the most dreaded. Harkening back to our understanding of Golang as a high-level language, Go was purposefully built to make coding faster, easier, and scalable. As a high-level language, its syntax is much more readable and compact than C++.

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This might not seem like a big deal, as the blocked thread doesn’t occupy the CPU. However, each context switch between threads involves an overhead. By the way, this effect has become relatively worse with modern, complex CPU architectures with multiple cache layers (“non-uniform memory access”, NUMA for short).

Linux, Windows, and Mac are just a few of the platforms on which NodeJS can be used. Additionally, NodeJS offers a sizable collection of libraries that accelerate the creation of web applications. It’s often easier to write synchronous code because you don’t have to keep writing code to put things down and pick them back up every time you can’t make forward progress. Straightforward “do this, then do that, if this happens do this other thing” code is easier to write than a state machine updating explicit state. Virtual threads can give you most of the benefits of asynchronous code while your coding experience is much closer to that of writing synchronous code. Since the beginning, it’s been described as a simplified language addressed to developers with little experience.

  • Its improvement started in 2007 at Google, and it was acquainted with the general population in 2009.
  • The attempt in listing 1 to start 10,000 threads will bring most computers to their knees .
  • However, those who want to experiment with it have the option, see listing 3.
  • At the moment everything is still experimental and APIs may still change.
  • I like the programming model of Reactor, but it fights against all the tools in the JVM ecosystem.

As a result, it cannot boast quite such a broad application in commercial projects. An embodiment of the “write once, run anywhere” concept, Java was supposed to make the development process simpler. project loom It extends Java with virtual threads that allow lightweight concurrency. Preview releases are available and show what’ll be possible. The HTTP server just spawns virtual threads for every request.

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Golang makes it straightforward to access development tools as an open-source programming language. In the context of virtual threads, “channels” are particularly worth mentioning here. Kotlin and Clojure offer these as the preferred communication model for their coroutines. Instead of shared, mutable state, they rely on immutable messages that are written to a channel and received from there by the receiver. Whether channels will become part of Project Loom, however, is still open.

Virtual Threads

This Golang project aims to implement the language’s hybrid nature to provide an enhanced development and deployment experience for Go applications. This method is typical of the error handling that many programmers are familiar with. So in terms of familiarity and ease of use, Node JS races ahead. Golang, on the other hand, is more suited for scalability thanks to its coroutines, which it refers to as ‘goroutines.’ Goroutines allow many threads to run simultaneously. This allows parallel activities to be completed quickly and reliably. The attempt in listing 1 to start 10,000 threads will bring most computers to their knees .

So effectively, the carrier-thread is not sitting idle but executing some other work. And comes back to continue the execution of the original virtual-thread whenever unparked. But here, you have a single carrier-thread in a way executing the body of multiple virtual-threads, switching from one to another when blocked. When a request comes in, a thread carries the task up until it reaches the DB, wherein the task has to wait for the response from DB. At this point, the thread is returned to the thread pool and goes on to do the other tasks. When DB responds, it is again handled by some thread from the thread pool and it returns an HTTP response.

Node Js Vs Golang: Which Ones Best For You?

The mindset to write (and read!) reactive code is very different from the mindset to write traditional code. I willingly admit that changing one’s mindset just takes time, the duration depending on every developer. This means threads are actually waiting for most of their lifetime On one side, such threads do not use any CPU on their own. On the flip side, it uses other kinds of resources, in particular memory. When I run this program and hit the program with, say, 100 calls, the JVM thread graph shows a spike as seen below . The command I executed to generate the calls is very primitive, and it adds 100 JVM threads.

I may be wrong, but as far as I understand, the whole Reactive/Event Loop thing, and Netty in particular, was invented as an answer to the C10K+ problem. It has obvious drawbacks, as all your code now becomes Async, with ugly callbacks, meaningless stack traces, and therefore hard to maintain and to reason about. Making statements based on opinion; back them up with references or personal experience. As 1 indicates, there are tangible results that can be directly linked to this approach; and a few intangibles. Locking is easy — you just make one big lock around your transactions and you are good to go. Hard to get working, hard to choose the fineness of the grain.