19.0.0 released Nov 08, 2023
Vely dispatch request

Request handling
An incoming request is handled by a first available process:
Processing a request
To handle a request, a process first calls "vely_dispatch_request()" function.

"void vely_dispatch_request()" is an automatically generated request-dispatching function in Vely. It uses request name (see request-URL) to call the appropriate request handler.

For example, if the request name is "myreq", then function with signature "void myreq()" will be called - such function must be implemented in "myreq.vely" source code file.

You can implement two hooks into vely_dispatch_request(): one that executes before each request handling (before-request-handler) and one that executes afterwards (after-request-handler).

At the end of the request, all request memory and all file handles allocated by Vely will be freed (see memory-handling).

You cannot change the implementation of vely_dispatch_request(), but you can see it in the build directory (see vv).
Vely uses a hash table to match a request with a handler function. Typically, it takes only close to a single lookup to find the handler function, regardless of the number of possible request names a process may serve (be it 10 or 10,000 different request names). Vely pre-generates a hash table at compile time, so no run-time cycles are spent on creating it. Also, the hash table is created as a continuous block of memory in the program's data segment, which loads as a part of the program (likely as a single memory copy) and is very fast because accessing the data will likely need no pointer translations. As a result, Vely dispatcher is extremely fast.
Unrecognized requests
If no request has been recognized (i.e. request name does not match any request-handling .vely source file), then
In a debugger, breaking in this function gives you a good starting point to debug the handling of any given request, for instance in gdb:
br vely_dispatch_request

See also
See all

You are free to copy, redistribute and adapt this web page (even commercially), as long as you give credit and provide a dofollow link back to this page - see full license at CC-BY-4.0. Copyright (c) 2019-2023 Dasoftver LLC. Vely and elephant logo are trademarks of Dasoftver LLC. The software and information on this web site are provided "AS IS" and without any warranties or guarantees of any kind. Icons from table-icons.io copyright PaweĊ‚ Kuna, licensed under MIT license.