Why agent won't modify their own grpc class

[huange7]

There are instrumentation about grpc in java agent, and grpc is used in the agent code, will this grpc code be modified?
If not, by what means is it prevented?

[laurit]

Most of the agent code is loaded into separate class loader that is excluded from the instrumentation. Also agent does not include grpc libraries, you can see the list of libraries that are included in the agent in https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/licenses/licenses.md

[huange7]

Sorry, forgot to mention the agent version. I'm looking at the 1.16 version of the code. But here's how previous agent solved the problem?

[laurit]

Most of the agent code is loaded into separate class loader that is excluded from the instrumentation.

[huange7]

Here I don't really understand, if they are loaded by different class loaders, won't they be transformed?

[laurit]

opentelemetry-java-instrumentation/javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/ignore/GlobalIgnoredTypesConfigurer.java

Line 127 in e4445ab

.ignoreClassLoader(AgentClassLoader.class.getName())

opentelemetry-java-instrumentation/javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/ignore/IgnoredClassLoadersMatcher.java

Lines 38 to 43 in e4445ab

	IgnoreAllow ignored = ignoredClassLoaders.getOrNull(name);
	if (ignored == IgnoreAllow.ALLOW) {
	return false;
	} else if (ignored == IgnoreAllow.IGNORE) {
	return true;
	}

[huange7]

Oh! Thanks for your guidance.