MemoryMonitor.java 文件源码

public MemoryMonitor() {
    LOG.info("initializing");
    this.springContextId = "Unknown";
    ManagementFactory.getThreadMXBean().setThreadContentionMonitoringEnabled(true);
    ManagementFactory.getThreadMXBean().setThreadCpuTimeEnabled(true);
    lowMemoryListener = new NotificationListener() {
        public void handleNotification(Notification n, Object hb) {
            if (n.getType().equals(MemoryNotificationInfo.MEMORY_THRESHOLD_EXCEEDED)) {
                Map<String, String> memoryUsageStatistics = new HashMap<String, String>();
                memoryUsageStatistics.put("MemoryMXBean: " + MemoryType.HEAP, ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().toString());
                memoryUsageStatistics.put("MemoryMXBean:" + MemoryType.NON_HEAP, ManagementFactory.getMemoryMXBean().getNonHeapMemoryUsage().toString());
                for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
                    memoryUsageStatistics.put("MemoryPoolMXBean: " + pool.getType(), pool.getUsage().toString());
                }
                for (Listener listener : listeners) {
                    listener.memoryUsageLow(springContextId, memoryUsageStatistics, Arrays.toString(ManagementFactory.getThreadMXBean().findMonitorDeadlockedThreads()));
                }
            }
        }
    };
    ((NotificationEmitter) ManagementFactory.getMemoryMXBean()).addNotificationListener(lowMemoryListener, null, null);
}