Monitor class in java

Defines the part common to all monitor MBeans. A monitor MBean monitors values of an attribute common to a set of observed MBeans. The observed attribute is monitored at intervals specified by the granularity period. A gauge value (derived gauge) is derived from the values of the observed attribute.

Field Summary

The amount by which the capacity of the monitor arrays are automatically incremented when their size becomes greater than their capacity.

Flag denoting that a notification has occurred after changing the observed object or the observed attribute.

Constructor Summary

Method Summary

Allows the monitor MBean to perform any operations needed after having been unregistered by the MBean server.

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Allows the monitor MBean to perform any operations needed after having been registered in the MBean server or after the registration has failed.

Allows the monitor MBean to perform any operations it needs before being unregistered by the MBean server.

Allows the monitor MBean to perform any operations it needs before being registered in the MBean server.

Methods declared in class javax.management.NotificationBroadcasterSupport

Methods declared in class java.lang.Object

Methods declared in interface javax.management.NotificationBroadcaster

Methods declared in interface javax.management.NotificationEmitter

Field Detail

capacityIncrement

protected static final int capacityIncrement

The amount by which the capacity of the monitor arrays are automatically incremented when their size becomes greater than their capacity.

elementCount

protected int elementCount

alreadyNotified

@Deprecated protected int alreadyNotified

alreadyNotifieds

protected int[] alreadyNotifieds

Selected monitor errors that have already been notified. Each element in this array corresponds to an observed object in the vector. It contains a bit mask of the flags OBSERVED_OBJECT_ERROR_NOTIFIED etc, indicating whether the corresponding notification has already been sent for the MBean being monitored.

server

Reference to the MBean server. This reference is null when the monitor MBean is not registered in an MBean server. This reference is initialized before the monitor MBean is registered in the MBean server.

RESET_FLAGS_ALREADY_NOTIFIED

protected static final int RESET_FLAGS_ALREADY_NOTIFIED

OBSERVED_OBJECT_ERROR_NOTIFIED

protected static final int OBSERVED_OBJECT_ERROR_NOTIFIED

Flag denoting that a notification has occurred after changing the observed object. This flag is used to check that the new observed object is registered in the MBean server at the time of the first notification.

OBSERVED_ATTRIBUTE_ERROR_NOTIFIED

protected static final int OBSERVED_ATTRIBUTE_ERROR_NOTIFIED

Flag denoting that a notification has occurred after changing the observed attribute. This flag is used to check that the new observed attribute belongs to the observed object at the time of the first notification.

OBSERVED_ATTRIBUTE_TYPE_ERROR_NOTIFIED

protected static final int OBSERVED_ATTRIBUTE_TYPE_ERROR_NOTIFIED

Flag denoting that a notification has occurred after changing the observed object or the observed attribute. This flag is used to check that the observed attribute type is correct (depending on the monitor in use) at the time of the first notification.

RUNTIME_ERROR_NOTIFIED

protected static final int RUNTIME_ERROR_NOTIFIED

Flag denoting that a notification has occurred after changing the observed object or the observed attribute. This flag is used to notify any exception (except the cases described above) when trying to get the value of the observed attribute at the time of the first notification.

dbgTag

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Class Monitor

Field Summary

The amount by which the capacity of the monitor arrays are automatically incremented when their size becomes greater than their capacity.

Flag denoting that a notification has occurred after changing the observed object or the observed attribute.

Constructor Summary

Method Summary

Allows the monitor MBean to perform any operations needed after having been unregistered by the MBean server.

Allows the monitor MBean to perform any operations needed after having been registered in the MBean server or after the registration has failed.

Allows the monitor MBean to perform any operations it needs before being unregistered by the MBean server.

Allows the monitor MBean to perform any operations it needs before being registered in the MBean server.

Methods declared in class javax.management.NotificationBroadcasterSupport

Methods declared in class java.lang.Object

Field Details

capacityIncrement

The amount by which the capacity of the monitor arrays are automatically incremented when their size becomes greater than their capacity.

elementCount

alreadyNotified

alreadyNotifieds

server

RESET_FLAGS_ALREADY_NOTIFIED

OBSERVED_OBJECT_ERROR_NOTIFIED

OBSERVED_ATTRIBUTE_ERROR_NOTIFIED

OBSERVED_ATTRIBUTE_TYPE_ERROR_NOTIFIED

RUNTIME_ERROR_NOTIFIED

dbgTag

Constructor Details

Monitor

Method Details

preRegister

Allows the monitor MBean to perform any operations it needs before being registered in the MBean server. Initializes the reference to the MBean server.

postRegister

Allows the monitor MBean to perform any operations needed after having been registered in the MBean server or after the registration has failed. Not used in this context.

preDeregister

Allows the monitor MBean to perform any operations it needs before being unregistered by the MBean server. Stops the monitor.

postDeregister

Allows the monitor MBean to perform any operations needed after having been unregistered by the MBean server. Not used in this context.

start

stop

getObservedObject

Returns the object name of the first object in the set of observed MBeans, or null if there is no such object.

setObservedObject

addObservedObject

removeObservedObject

containsObservedObject

getObservedObjects

getObservedAttribute

Gets the attribute being observed.
The observed attribute is not initialized by default (set to null).

setObservedAttribute

getGranularityPeriod

Gets the granularity period (in milliseconds).
The default value of the granularity period is 10 seconds.

setGranularityPeriod

Sets the granularity period (in milliseconds).
The default value of the granularity period is 10 seconds.

isActive

Tests whether 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.

Report a bug or suggest an enhancement
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