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Polish ProcessInfo #43789

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Polish ProcessInfo #43789

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36 changes: 27 additions & 9 deletions spring-boot-project/spring-boot/src/main/java/org/springframework/boot/info/ProcessInfo.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright 2012-2024 the original author or authors.
* Copyright 2012-2025 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
Expand All @@ -20,6 +20,9 @@
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.PlatformManagedObject;
import java.lang.reflect.Method;

import org.springframework.util.ClassUtils;

/**
* Information about the process of the application.
Expand All @@ -30,6 +33,11 @@
*/
public class ProcessInfo {

private static final String VIRTUAL_THREAD_SCHEDULER_CLASS = "jdk.management.VirtualThreadSchedulerMXBean";

private static final boolean VIRTUAL_THREAD_SCHEDULER_CLASS_PRESENT = ClassUtils
.isPresent(VIRTUAL_THREAD_SCHEDULER_CLASS, null);

private static final Runtime runtime = Runtime.getRuntime();

private final long pid;
Expand Down Expand Up @@ -85,14 +93,18 @@ public MemoryInfo getMemory() {
*/
@SuppressWarnings("unchecked")
public VirtualThreadsInfo getVirtualThreads() {
if (!VIRTUAL_THREAD_SCHEDULER_CLASS_PRESENT) {
return null;
}
try {
Class<PlatformManagedObject> mxBeanClass = (Class<PlatformManagedObject>) Class
.forName("jdk.management.VirtualThreadSchedulerMXBean");
Object bean = ManagementFactory.getPlatformMXBean(mxBeanClass);
return new VirtualThreadsInfo((Integer) mxBeanClass.getMethod("getMountedVirtualThreadCount").invoke(bean),
(Long) mxBeanClass.getMethod("getQueuedVirtualThreadCount").invoke(bean),
(Integer) mxBeanClass.getMethod("getParallelism").invoke(bean),
(Integer) mxBeanClass.getMethod("getPoolSize").invoke(bean));
Class<PlatformManagedObject> mxbeanClass = (Class<PlatformManagedObject>) ClassUtils
.forName(VIRTUAL_THREAD_SCHEDULER_CLASS, null);
PlatformManagedObject mxbean = ManagementFactory.getPlatformMXBean(mxbeanClass);
int mountedVirtualThreadCount = invokeMethod(mxbeanClass, mxbean, "getMountedVirtualThreadCount");
long queuedVirtualThreadCount = invokeMethod(mxbeanClass, mxbean, "getQueuedVirtualThreadCount");
int parallelism = invokeMethod(mxbeanClass, mxbean, "getParallelism");
int poolSize = invokeMethod(mxbeanClass, mxbean, "getPoolSize");
return new VirtualThreadsInfo(mountedVirtualThreadCount, queuedVirtualThreadCount, parallelism, poolSize);
}
catch (ReflectiveOperationException ex) {
return null;
Expand All @@ -111,6 +123,12 @@ public String getOwner() {
return this.owner;
}

@SuppressWarnings("unchecked")
private <T> T invokeMethod(Class<?> mxbeanClass, Object mxbean, String name) throws ReflectiveOperationException {
Method method = mxbeanClass.getMethod(name);
return (T) method.invoke(mxbean);
}

/**
* Virtual threads information.
*
Expand All @@ -126,7 +144,7 @@ public static class VirtualThreadsInfo {

private final int poolSize;

public VirtualThreadsInfo(int mounted, long queued, int parallelism, int poolSize) {
VirtualThreadsInfo(int mounted, long queued, int parallelism, int poolSize) {
this.mounted = mounted;
this.queued = queued;
this.parallelism = parallelism;
Expand Down
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