是否可以从JVM实例内部访问JVM的JMX服务器?还是我必须通过标准套接字/端口远程接口连接?
+----------------------------------------+ Option 2: Connect
| +---------------------------+ | through sockets like
| | My Notification Listener |+----->----------+ a remote
| | | | | monitor.
| +---------------------------+ | |
| + | |
| Option 1: connect| | |
| to the internal | | |
| JMX server. I'm | | |
| trying to find | | |
| if this is possible. | |
| | | |
| | | |
| A single JVM instance. | | |
| | | |
| +------------+-----v------+--+ | |
| | | GuageMXBean|<-+<--------------+
| | +------------+ | |
| | JMX MXBean Server | |
| +----------------------------+ |
+----------------------------------------+
上下文:我正在尝试实施一个响应JVM状态的"智能"系统,特别是内存使用情况,在将工作数据的缓存数据转移到磁盘之间,并将其固定在RAM中。设置JMX侦听器似乎比运行具有类似的背景线程的背景线程更优雅:
Runtime RTime = Runtime.getRuntime();
while(!shutdown)
{
if((RTime.totalMemory / RTime.maxMemory) > upperThreshold) cachmode = CACHETODISK;
if((RTime.totalMemory / RTime.maxMemory) < lowerThreshold) cachmode = CACHETORAM;
Sleep(1000);
}
桌面应用程序,如果有所不同。
这是我的第一个帖子,因此欢迎有关问题的任何提示等。
您可以轻松地从使用此代码中获取平台MBEAN服务器。
ManagementFactory.getPlatformMBeanServer();
有很多有用的MBEAN用于收集有关JVM状态的信息。这是一个简单的示例
List<GarbageCollectorMXBean> gcBeans = ManagementFactory.getGarbageCollectorMXBeans();
// generate heap state report
String report = "";
for (GarbageCollectorMXBean gc : gcBeans) {
report += "nGC Name : " + gc.getName();
report += "nCollection count: " + gc.getCollectionCount();
report += "nCollection Time : " + gc.getCollectionTime() + " milli seconds";
report += "n";
}
List<MemoryPoolMXBean> memoryPoolMXBeans = ManagementFactory.getMemoryPoolMXBeans();
for (MemoryPoolMXBean pool : memoryPoolMXBeans) {
report += "nMemory Pool: " + pool.getName();
MemoryUsage usage = pool.getUsage();
report += "n Max : " + usage.getMax() / 1024000 + "MB";
report += "n Used: " + usage.getUsed() / 1024000 + "MB";
report += "n";
}