B4J Question [Server] AddHandler with SingleThreadHandler = True

Alessandro71 · Aug 3, 2025

I need to run a server handler in single thread mode.
I see that when a request is sent to that handler, and the previous execution is not finished yet, the second request is paused until the first one is done.
How can I count how many requests are waiting to be executed?
A counter inside the handler is not useful, since the handled is not called until the previous one is running.

Erel · Aug 4, 2025

Why do you need it? Maybe you can add a regular handler that will redirect to the single thread handler.

It will probably be better to use a (read-write) lock: https://www.b4x.com/android/forum/threads/lock-writelock-writerelease.63612/#post-402268

Alessandro71 · Aug 4, 2025

Erel said:
Why do you need it? Maybe you can add a regular handler that will redirect to the single thread handler.

just for monitoring purpose: if I see a high number of waiting threads, I need to spawn a new server instance to balance the load

Erel · Aug 4, 2025

Why do you need it to be a single thread handler?

Alessandro71 · Aug 4, 2025

Erel said:
Why do you need it to be a single thread handler?

making a long story short: converting existing code to server.
the existing code requires massive rewrite to remove global objects dependencies, so the quick solution is using it single-threaded, while rewrite is planned but not imminent

Alessandro71 · Aug 4, 2025

Erel said:
Maybe you can add a regular handler that will redirect to the single thread handler.

sounds interesting: how to call a single thread handler from a regular handler?

Erel · Aug 4, 2025

Alessandro71 said:
the existing code requires massive rewrite to remove global objects dependencies, so the quick solution is using it single-threaded, while rewrite is planned but not imminent

If these variables belong to the handler class then it will "simply work".

You can redirect the request with resp.SendRedirect. Or with a Filter class.

Alessandro71 · Aug 4, 2025

Erel said:
If these variables belong to the handler class then it will "simply work".

that's not the case, being globals in a code module, already tested.

Erel said:
You can redirect the request with resp.SendRedirect. Or with a Filter class.

I'll try, thanks

B4J Question [Server] AddHandler with SingleThreadHandler = True

Alessandro71

Well-Known Member

Erel

B4X founder

Alessandro71

Well-Known Member

Erel

B4X founder

Alessandro71

Well-Known Member

Alessandro71

Well-Known Member

Erel

B4X founder

Alessandro71

Well-Known Member

Similar Threads

B4J Question [Server] AddHandler with SingleThreadHandler = True

Well-Known Member

B4X founder

Well-Known Member

B4X founder

Well-Known Member

Well-Known Member

B4X founder

Well-Known Member

Similar Threads

Privacy & Transparency

Privacy & Transparency