IT. Expert System.

Java Standard Edition (SE)



Class CounterMonitor

  • All Implemented Interfaces:
    MBeanRegistration, CounterMonitorMBean, MonitorMBean, NotificationBroadcaster, NotificationEmitter

    public class CounterMonitor
    extends Monitor
    implements CounterMonitorMBean
    Defines a monitor MBean designed to observe the values of a counter attribute.

    A counter monitor sends a threshold notification when the value of the counter reaches or exceeds a threshold known as the comparison level. The notify flag must be set to true.

    In addition, an offset mechanism enables particular counting intervals to be detected. If the offset value is not zero, whenever the threshold is triggered by the counter value reaching a comparison level, that comparison level is incremented by the offset value. This is regarded as taking place instantaneously, that is, before the count is incremented. Thus, for each level, the threshold triggers an event notification every time the count increases by an interval equal to the offset value.

    If the counter can wrap around its maximum value, the modulus needs to be specified. The modulus is the value at which the counter is reset to zero.

    If the counter difference mode is used, the value of the derived gauge is calculated as the difference between the observed counter values for two successive observations. If this difference is negative, the value of the derived gauge is incremented by the value of the modulus. The derived gauge value (V[t]) is calculated using the following method:

    • if (counter[t] - counter[t-GP]) is positive then V[t] = counter[t] - counter[t-GP]
    • if (counter[t] - counter[t-GP]) is negative then V[t] = counter[t] - counter[t-GP] + MODULUS
    This implementation of the counter monitor requires the observed attribute to be of the type integer (Byte, Integer, Short, Long).


Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)





Java Script








Design patterns

RFC (standard status)

RFC (proposed standard status)

RFC (draft standard status)

RFC (informational status)

RFC (experimental status)

RFC (best current practice status)

RFC (historic status)

RFC (unknown status)

IT dictionary

All information of this service is derived from the free sources and is provided solely in the form of quotations. This service provides information and interfaces solely for the familiarization (not ownership) and under the "as is" condition.
Copyright 2016 © ELTASK.COM. All rights reserved.
Site is optimized for mobile devices.
Downloads: 329 / 159283365. Delta: 0.04991 с