Under what circumstances would OT use CacheBasedVirtualField?

[123liuziming]

Usually OT will use RuntimeVirtualField whenever possible. I want to know under what circumstances would OT use CacheBasedVirtualField?

[laurit]

It will be use when VirtualField is used in a library instrumentation.

[123liuziming]

This is the virtual field in rocketmq library instrumentation. It seems that it is a RuntimeVirtualField. Is there an example to use CacheBasedVirtualField? I 've not seen it yet.

[laurit]

Try using a library instrumentation without the javaagent.

[123liuziming]

I agree, in this case, the constructor of VirtualFieldImplementationInstallerFactory will not be called.

[123liuziming]

I think the CacheBasedVirtualField may be used for class that has already been loaded too early.

At that time the RuntimeVirtualFieldSupplier.set method is not executed.

[123liuziming]

Try using a library instrumentation without the javaagent.