MonitorMBean (Java SE 26 & JDK 26)
Description: declaration: module: java.management, package: javax.management.monitor, interface: MonitorMBean
Keywords: javax.management.monitor.MonitorMBean interface

# Interface MonitorMBean

All Known Subinterfaces:
  `CounterMonitorMBean, GaugeMonitorMBean, StringMonitorMBean`

All Known Implementing Classes:
  `CounterMonitor, GaugeMonitor, Monitor, StringMonitor`

public interface MonitorMBean
Exposes the remote management interface of monitor MBeans.

Since:
  1.5

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addObservedObject(ObjectName object)`
  Adds the specified object in the set of observed MBeans.
  `boolean`
  `containsObservedObject(ObjectName object)`
  Tests whether the specified object is in the set of observed MBeans.
  `long`
  `getGranularityPeriod()`
  Gets the granularity period (in milliseconds).
  `String`
  `getObservedAttribute()`
  Gets the attribute being observed.
  `ObjectName`
  `getObservedObject()`
  Deprecated.
  As of JMX 1.2, replaced by `getObservedObjects()`
  `ObjectName[]`
  `getObservedObjects()`
  Returns an array containing the objects being observed.
  `boolean`
  `isActive()`
  Tests if the monitor MBean is active.
  `void`
  `removeObservedObject(ObjectName object)`
  Removes the specified object from the set of observed MBeans.
  `void`
  `setGranularityPeriod(long period)`
  Sets the granularity period (in milliseconds).
  `void`
  `setObservedAttribute(String attribute)`
  Sets the attribute to observe.
  `void`
  `setObservedObject(ObjectName object)`
  Deprecated.
  As of JMX 1.2, replaced by `addObservedObject(ObjectName)`
  `void`
  `start()`
  Starts the monitor.
  `void`
  `stop()`
  Stops the monitor.

- ## Method Details

  - ### start

    void start()
    Starts the monitor.

  - ### stop

    void stop()
    Stops the monitor.

  - ### addObservedObject

    void addObservedObject(ObjectName object) throws IllegalArgumentException
    Adds the specified object in the set of observed MBeans.
    Parameters:
      `object` - The object to observe.
    Throws:
      `IllegalArgumentException` - the specified object is null.

  - ### removeObservedObject

    void removeObservedObject(ObjectName object)
    Removes the specified object from the set of observed MBeans.
    Parameters:
      `object` - The object to remove.

  - ### containsObservedObject

    boolean containsObservedObject(ObjectName object)
    Tests whether the specified object is in the set of observed MBeans.
    Parameters:
      `object` - The object to check.
    Returns:
      `true` if the specified object is in the set, `false` otherwise.

  - ### getObservedObjects

    ObjectName[] getObservedObjects()
    Returns an array containing the objects being observed.
    Returns:
      The objects being observed.

  - ### getObservedObject

    @Deprecated ObjectName getObservedObject()
    Deprecated.
    As of JMX 1.2, replaced by `getObservedObjects()`
    Gets the object name of the object being observed.
    Returns:
      The object being observed.
    See Also:
      - `setObservedObject(ObjectName)`

  - ### setObservedObject

    @Deprecated void setObservedObject(ObjectName object)
    Deprecated.
    As of JMX 1.2, replaced by `addObservedObject(ObjectName)`
    Sets the object to observe identified by its object name.
    Parameters:
      `object` - The object to observe.
    See Also:
      - `getObservedObject()`

  - ### getObservedAttribute

    String getObservedAttribute()
    Gets the attribute being observed.
    Returns:
      The attribute being observed.
    See Also:
      - `setObservedAttribute(String)`

  - ### setObservedAttribute

    void setObservedAttribute(String attribute)
    Sets the attribute to observe.
    Parameters:
      `attribute` - The attribute to observe.
    See Also:
      - `getObservedAttribute()`

  - ### getGranularityPeriod

    long getGranularityPeriod()
    Gets the granularity period (in milliseconds).
    Returns:
      The granularity period.
    See Also:
      - `setGranularityPeriod(long)`

  - ### setGranularityPeriod

    void setGranularityPeriod(long period) throws IllegalArgumentException
    Sets the granularity period (in milliseconds).
    Parameters:
      `period` - The granularity period.
    Throws:
      `IllegalArgumentException` - The granularity period is less than or equal to zero.
    See Also:
      - `getGranularityPeriod()`

  - ### isActive

    boolean isActive()
    Tests if the monitor MBean is active. A monitor MBean is marked active when the `start` method is called. It becomes inactive when the `stop` method is called.
    Returns:
      `true` if the monitor MBean is active, `false` otherwise.