On Sun, 28 Jan 2024 22:33:01 GMT, Rafael Winterhalter
<[email protected]> wrote:
> What stops people from supplying a fake instance? Wouldn't you need to "test
> run" the instance first?
Not necessarily. When the generated API implementation relies on the
capabilities of class `Instrumentation` -- such as opening modules -- to
implement the invoked operation the obvious answer is that a fake instance just
won't work.
However, if you want the implementation to validate an incoming call you can
easily arrange for that. For example, provide a method on the agent class that
says yes to its own instance and no for any other instances e.g.
class AgentClass {
private static Instrumentation myInst = null;
void premain(Instrumentation inst) {
myInst = inst;
. . .
}
static boolean validate(Instrumentation inst) {
return myInst != null && inst == myInst;
}
. . .
}
Method validate can be used to ensure API calls only proceed when invoked by
the agent or code that the agent trusts.
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PR Comment: https://git.openjdk.org/jdk/pull/3546#issuecomment-1914771074
