[discussion] calling timing of messenger.start();

[maru7777]

hello admin, recently I want write a plugin, it has a few UI components and each componet has its own UI .all components locate in a same webview

I want to register callback function in each component UI , but vscode-messenger have to register all callback function before calling messenger.start(); , maybe ?

but i can not load all components at the very beginning , only when user load that page will it begin to register callback

but at that time messenger.start(); has been called for a long time

if I write all callback and register them in very beginning , i can not get full context , some function maybe not work well

so can I deferred the callback registration until component loading ? register ant callback at any time ?

or can I use multiple instance in multiple components ?

[dhuebner]

Hey, @maru7777 !

start() registers a listener to the window so it can process incoming events.

This means onRequest() and onNotification() can be called before or after start() — there is no restriction.
Each component can register its handlers when it initializes (lazily), even if start() was called long before.
This means for you that incoming events to other tabs (if special) will not be processed as there is no handler for that.

Why NOT multiple Messenger instances?

• acquireVsCodeApi() (used internally) can only be called once per webview lifetime — it's a VS Code restriction.
• Multiple instances would both listen to window.message, so messages could be processed twice or cause conflicts.

[maru7777]

oh yea, I got it now ! that explanation helps me a lot !