Netty VS Mongoose

Code of netty is here and using following library

We use Netty (https://netty.io/) as the source of the MQTT communication, and we build the MQTT features the MQTT broker should support ourselves on top of that.

In this space, we also have the somewhat related term blocking. Java's NIO library is one well-known non-blocking tool used for managing multiple tasks on a single Java thread. When listening to sockets, most of the time a thread is just blocked, doing nothing until it receives some data. So, it's efficient to use a single thread for monitoring many sockets, to increase the likelihood of the thread having some actual work to do. The Selector API does this but is notoriously challenging to program well. Instead, developers use frameworks like Netty which abstract some of NIO's complexity and layer on some best practices.

DirectByteBuffer exhibits an intriguing behavior: it deallocates its backing memory during the finalization process, which occurs after garbage collection (GC) cycles. This poses an issue if your system is conservative with on-heap allocations, leading to infrequent GC cycles. In such cases, there could be a significant delay between the time the memory becomes unreferenced and when it is actually deallocated. This behavior could, in some respects, mimic a memory leak.

This is why some libraries hacks into DirectByteBuffer to deallocate memory explicitly, bypassing the finalizer altogether. For instance, the Netty library has implemented such a workaround, see Netty as an [example](https://github.com/netty/netty/blob/795db4a866401aa172757b95...).

Apologies replying to myself, but Netty, which underpins many of the popular Java backend frameworks, see backward compatibility as more important than supporting green threads.

https://github.com/netty/netty/issues/12816

It'll be interesting to see who (if anyone) picks up Netty's mantle in the Project Loom world.

Looks fairly recent so I'm glad I had a pre oct22 build https://github.com/netty/netty/issues/12737

This is better? https://github.com/netty/netty/blob/4.1/pom.xml

Given the fact that Lettuce is built with Netty, we also immediately noticed quite an impact on the initialization time (cold start) of our lambda function. Netty is really fast while executing, but takes a bit of time to initialize. The new Lambda Snapstart functionality might help with that.

I've found myself at this webpage multiple times while trying to minimize the complexity of APIs in my C projects.

My conclusion for now is that C coroutines are something to be left to the implementer. For example: Mongoose (https://github.com/cesanta/mongoose) uses event callbacks to deal with asynchronousness. It is much more pleasant to wrap a library like this in whatever thread/task primitives your system has rather than try to integrate the mythical cross-platform c couroutine.

I remember using mongoose 15 years back. Today i would have considered mongoose(10k+ stars) which is also a mature c/c++ web server[1] if not the licence.

https://github.com/cesanta/mongoose/tree/master/examples

Alternatives at the low to medium level of abstraction include civetweb and mongoose, which have a common ancestor. Both of these appear to be C rather than C++, but seem to be production quality and well-documented. Another C library is cpp-httplib, which is probably too low-level for me.

Since this is only going to be used internally would Mongoose be worth considering?

Here’s an example: https://mongoose.ws/

If you are looking for something simple there is mongoose from cesanta, https://github.com/cesanta/mongoose