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[wip] how to trigger a CE fiber dump programatically
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| //> using scala "2.13.11" | |
| //> using lib "org.typelevel::cats-effect:3.5.1" | |
| import java.lang.management.ManagementFactory | |
| import javax.management.ObjectName | |
| import javax.management.Query | |
| import scala.collection.JavaConverters.asScalaSetConverter | |
| import javax.management.MBeanServer | |
| import cats.effect.{IO, IOApp} | |
| object MBean extends IOApp.Simple { | |
| def readFibersFromRuntime: IO[String] = IO { | |
| val mbs: MBeanServer = ManagementFactory.getPlatformMBeanServer | |
| val beans = mbs.queryMBeans(null, null) // just get all the beans | |
| val className = "cats.effect.unsafe.metrics.LiveFiberSnapshotTrigger" | |
| val bean = beans.asScala | |
| .find(_.getClassName == className) | |
| .getOrElse(throw new Exception("Failed to find bean")) | |
| val fiberDump = mbs | |
| .invoke(bean.getObjectName, "liveFiberSnapshot", Array.empty, Array.empty) | |
| .asInstanceOf[Array[String]] | |
| .mkString | |
| val extraWhitespace = """(\n\s*){3,}""".r | |
| extraWhitespace.replaceAllIn(fiberDump, "\n\n") | |
| } | |
| val run: IO[Unit] = readFibersFromRuntime.flatMap(IO.println) | |
| } |
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