Module java.management

Package javax.management.modelmbean

Class ModelMBeanAttributeInfo

java.lang.Object

javax.management.MBeanFeatureInfo

javax.management.MBeanAttributeInfo

javax.management.modelmbean.ModelMBeanAttributeInfo

All Implemented Interfaces:

Serializable, Cloneable, DescriptorAccess, DescriptorRead

public class ModelMBeanAttributeInfo
extends MBeanAttributeInfo
implements DescriptorAccess

The ModelMBeanAttributeInfo object describes an attribute of the ModelMBean. It is a subclass of MBeanAttributeInfo with the addition of an associated Descriptor and an implementation of the DescriptorAccess interface.

The fields in the descriptor are defined, but not limited to, the following. Note that when the Type in this table is Number, a String that is the decimal representation of a Long can also be used.

ModelMBeanAttributeInfo Fields

Name	Type	Meaning
name	String	Attribute name.
descriptorType	String	Must be "attribute".
value	Object	Current (cached) value for attribute.
default	Object	Default value for attribute.
displayName	String	Name of attribute to be used in displays.
getMethod	String	Name of operation descriptor for get method.
setMethod	String	Name of operation descriptor for set method.
protocolMap	Descriptor	See the section "Protocol Map Support" in the JMX specification document. Mappings must be appropriate for the attribute and entries can be updated or augmented at runtime.
persistPolicy	String	One of: OnUpdate|OnTimer|NoMoreOftenThan|OnUnregister|Always|Never. See the section "MBean Descriptor Fields" in the JMX specification document.
persistPeriod	Number	Frequency of persist cycle in seconds. Used when persistPolicy is "OnTimer" or "NoMoreOftenThan".
currencyTimeLimit	Number	How long value is valid: <0 never, =0 always, >0 seconds.
lastUpdatedTimeStamp	Number	When value was set.
visibility	Number	1-4 where 1: always visible, 4: rarely visible.
presentationString	String	XML formatted string to allow presentation of data.

The default descriptor contains the name, descriptorType and displayName fields. The default value of the name and displayName fields is the name of the attribute.

Note: because of inconsistencies in previous versions of this specification, it is recommended not to use negative or zero values for currencyTimeLimit. To indicate that a cached value is never valid, omit the currencyTimeLimit field. To indicate that it is always valid, use a very large number for this field.

The serialVersionUID of this class is 6181543027787327345L.

Since:

1.5

See Also:

• Serialized Form

Field Summary

Fields declared in class javax.management.MBeanFeatureInfo

description, name

Constructor Summary

Constructors

Constructor	Description
ModelMBeanAttributeInfo(String name, String description, Method getter, Method setter)	Constructs a ModelMBeanAttributeInfo object with a default descriptor.
ModelMBeanAttributeInfo(String name, String description, Method getter, Method setter, Descriptor descriptor)	Constructs a ModelMBeanAttributeInfo object.
ModelMBeanAttributeInfo(String name, String type, String description, boolean isReadable, boolean isWritable, boolean isIs)	Constructs a ModelMBeanAttributeInfo object with a default descriptor.
ModelMBeanAttributeInfo(String name, String type, String description, boolean isReadable, boolean isWritable, boolean isIs, Descriptor descriptor)	Constructs a ModelMBeanAttributeInfo object.
ModelMBeanAttributeInfo(ModelMBeanAttributeInfo inInfo)	Constructs a new ModelMBeanAttributeInfo object from this ModelMBeanAttributeInfo Object.

Method Summary

Modifier and Type	Method	Description
Object	clone()	Creates and returns a new ModelMBeanAttributeInfo which is a duplicate of this ModelMBeanAttributeInfo.
Descriptor	getDescriptor()	Gets a copy of the associated Descriptor for the ModelMBeanAttributeInfo.
void	setDescriptor(Descriptor inDescriptor)	Sets associated Descriptor (full replace) for the ModelMBeanAttributeDescriptor.
String	toString()	Returns a human-readable version of the ModelMBeanAttributeInfo instance.

Methods declared in class javax.management.MBeanAttributeInfo

equals, getType, isIs, isReadable, isWritable

Methods declared in class javax.management.MBeanFeatureInfo

getDescription, getName

Methods declared in class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

ModelMBeanAttributeInfo

public ModelMBeanAttributeInfo(String name,
 String description,
 Method getter,
 Method setter)
                        throws IntrospectionException

Constructs a ModelMBeanAttributeInfo object with a default descriptor. The Descriptor of the constructed object will include fields contributed by any annotations on the Method objects that contain the DescriptorKey meta-annotation.

Parameters:

name - The name of the attribute.

description - A human readable description of the attribute. Optional.

getter - The method used for reading the attribute value. May be null if the property is write-only.

setter - The method used for writing the attribute value. May be null if the attribute is read-only.

Throws:

IntrospectionException - There is a consistency problem in the definition of this attribute.

ModelMBeanAttributeInfo

public ModelMBeanAttributeInfo(String name,
 String description,
 Method getter,
 Method setter,
 Descriptor descriptor)
                        throws IntrospectionException

Constructs a ModelMBeanAttributeInfo object. The Descriptor of the constructed object will include fields contributed by any annotations on the Method objects that contain the DescriptorKey meta-annotation.

Parameters:

name - The name of the attribute.

description - A human readable description of the attribute. Optional.

getter - The method used for reading the attribute value. May be null if the property is write-only.

setter - The method used for writing the attribute value. May be null if the attribute is read-only.

descriptor - An instance of Descriptor containing the appropriate metadata for this instance of the Attribute. If it is null, then a default descriptor will be created. If the descriptor does not contain the field "displayName" this field is added in the descriptor with its default value.

Throws:

IntrospectionException - There is a consistency problem in the definition of this attribute.

RuntimeOperationsException - Wraps an IllegalArgumentException. The descriptor is invalid, or descriptor field "name" is not equal to name parameter, or descriptor field "descriptorType" is not equal to "attribute".

ModelMBeanAttributeInfo

public ModelMBeanAttributeInfo(String name,
 String type,
 String description,
 boolean isReadable,
 boolean isWritable,
 boolean isIs)

Constructs a ModelMBeanAttributeInfo object with a default descriptor.

Parameters:

name - The name of the attribute

type - The type or class name of the attribute

description - A human readable description of the attribute.

isReadable - True if the attribute has a getter method, false otherwise.

isWritable - True if the attribute has a setter method, false otherwise.

isIs - True if the attribute has an "is" getter, false otherwise.

ModelMBeanAttributeInfo

public ModelMBeanAttributeInfo(String name,
 String type,
 String description,
 boolean isReadable,
 boolean isWritable,
 boolean isIs,
 Descriptor descriptor)

Constructs a ModelMBeanAttributeInfo object.

Parameters:

name - The name of the attribute

type - The type or class name of the attribute

description - A human readable description of the attribute.

isReadable - True if the attribute has a getter method, false otherwise.

isWritable - True if the attribute has a setter method, false otherwise.

isIs - True if the attribute has an "is" getter, false otherwise.

descriptor - An instance of Descriptor containing the appropriate metadata for this instance of the Attribute. If it is null then a default descriptor will be created. If the descriptor does not contain the field "displayName" this field is added in the descriptor with its default value.

Throws:

RuntimeOperationsException - Wraps an IllegalArgumentException. The descriptor is invalid, or descriptor field "name" is not equal to name parameter, or descriptor field "descriptorType" is not equal to "attribute".

ModelMBeanAttributeInfo

public ModelMBeanAttributeInfo(ModelMBeanAttributeInfo inInfo)

Constructs a new ModelMBeanAttributeInfo object from this ModelMBeanAttributeInfo Object. A default descriptor will be created.

Parameters:

inInfo - the ModelMBeanAttributeInfo to be duplicated

Method Details

getDescriptor

public Descriptor getDescriptor()

Gets a copy of the associated Descriptor for the ModelMBeanAttributeInfo.

Specified by:

getDescriptor in interface DescriptorRead

Overrides:

getDescriptor in class MBeanFeatureInfo

Returns:

Descriptor associated with the ModelMBeanAttributeInfo object.

See Also:

• setDescriptor(javax.management.Descriptor)

setDescriptor

public void setDescriptor(Descriptor inDescriptor)

Sets associated Descriptor (full replace) for the ModelMBeanAttributeDescriptor. If the new Descriptor is null, then the associated Descriptor reverts to a default descriptor. The Descriptor is validated before it is assigned. If the new Descriptor is invalid, then a RuntimeOperationsException wrapping an IllegalArgumentException is thrown.

Specified by:

setDescriptor in interface DescriptorAccess

Parameters:

inDescriptor - replaces the Descriptor associated with the ModelMBeanAttributeInfo

Throws:

RuntimeOperationsException - Wraps an IllegalArgumentException for an invalid Descriptor

See Also:

• getDescriptor()

clone

public Object clone()

Creates and returns a new ModelMBeanAttributeInfo which is a duplicate of this ModelMBeanAttributeInfo.

Overrides:

clone in class MBeanAttributeInfo

Returns:

a clone of this instance.

Throws:

RuntimeOperationsException - for illegal value for field Names or field Values. If the descriptor construction fails for any reason, this exception will be thrown.

See Also:

• Cloneable

toString

public String toString()

Returns a human-readable version of the ModelMBeanAttributeInfo instance.

Overrides:

toString in class Object

Returns:

a string representation of the object