Java 获取垃圾回收队列长度
Java About 901 words反射获取
Java 8
及之前可以使用反射,获取Finalizer
中的queue
字段,然后获取长度。
但Java 9
模块化之后不可用。
try {
Class<?> finalizerClass = Class.forName("java.lang.ref.Finalizer");
Field queueStaticField = finalizerClass.getDeclaredField("queue");
queueStaticField.setAccessible(true);
ReferenceQueue<Object> referenceQueue = (ReferenceQueue) queueStaticField.get(null);
Field queueLengthField = ReferenceQueue.class.getDeclaredField("queueLength");
queueLengthField.setAccessible(true);
long queueLength = (long) queueLengthField.get(referenceQueue);
System.out.format(LocalDateTime.now() + " There are %d references in the queue---%d%n", queueLength, ManagementFactory.getMemoryMXBean().getObjectPendingFinalizationCount());
} catch (Exception e) {
e.printStackTrace();
}
MXBean
使用Management Extension Bean
获取待回收对象的个数。
ManagementFactory.getMemoryMXBean().getObjectPendingFinalizationCount()
Views: 586 · Posted: 2023-06-20
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