On 09/29/2016 07:50 PM, Rafael Winterhalter wrote:
> I want to propose adding a method to the instrumentation API to receive an
> instance of the current VM's instrumentation API. Currently, many
> applications "self-attach" to gain such access. Unfortunately, this only
> works on JDK-VMs but I believe that this approach will grow in popularity
> with Java 9 where the Attach API is also part of any regular VM.
> interface Instrumentation {
> static Instrumentation getInstance(boolean redefine, boolean retransform,
> boolean nativePrefix) {
> // security manager check
> return getInstance0(redefine, retransform, nativePrefix);
> }
> }
I would like to second this proposal.
Our very own JOL [1] uses self-attach [2] to get Instrumentation
instance for carefully polling Object instance sizes. Self-attach
enables JOL usage as the library dependency without requiring command
line tweaks.
Thanks,
-Aleksey
[1] http://openjdk.java.net/projects/code-tools/jol/
[2]
http://hg.openjdk.java.net/code-tools/jol/file/b5653b56d154/jol-core/src/main/java/org/openjdk/jol/vm/InstrumentationSupport.java
