auto-prune in-memory stream data

[DaveSkender]

Hi, I'm right now trying out v3.0.0 preview and wanted to ask whether there is or will be an option to limit the size of the data collections held by both, observable and observer, as I didn't find any yet. Thanks!

Originally posted by @elpht in #1018 (comment)

The idea of these collections growing in an uncontrolled manner has crossed my mind. Since these are instantiated classes, I think we can add an optional setting so you can supply a max size that'll trigger some auto-pruning after new data arrives. Makes sense.

Objective:

• add standard optional settings schema with defaults
• setting for max collection size, with auto-pruning (default: off)

See also:

• v3.0.0 preview | Streaming indicators and quotes #1018 (comment)

[DaveSkender]

This was implemented for v3.

Instead of an unlimited cache size option, I based the default on 90% of the int size, which is effectively the same thing but does cap it to avoid running out of the List native size.

Since everything is derived from a QuoteHub ultimately, maxCacheSize is set on its instantiation and subscribers (observers) simply inherit it. There is a backdoor way to instantiate a non-Quote hub, but it's unadvisable for most users as it's difficult to use that way.

[DaveSkender]

This is available in 3.0.0-preview.1