MBeanInfo (Java SE 15 & JDK 15) (original) (raw)

All Implemented Interfaces:

[Serializable](../../../java.base/java/io/Serializable.html "interface in java.io"), [Cloneable](../../../java.base/java/lang/Cloneable.html "interface in java.lang"), [DescriptorRead](DescriptorRead.html "interface in javax.management")

Direct Known Subclasses:

[ModelMBeanInfoSupport](modelmbean/ModelMBeanInfoSupport.html "class in javax.management.modelmbean"), [OpenMBeanInfoSupport](openmbean/OpenMBeanInfoSupport.html "class in javax.management.openmbean")

public class MBeanInfo extends Object implements Cloneable, Serializable, DescriptorRead

Describes the management interface exposed by an MBean; that is, the set of attributes and operations which are available for management operations. Instances of this class are immutable. Subclasses may be mutable but this is not recommended.

Usually the MBeanInfo for any given MBean does not change over the lifetime of that MBean. Dynamic MBeans can change theirMBeanInfo and in that case it is recommended that they emit a Notification with a type of "jmx.mbean.info.changed" and a userData that is the new MBeanInfo. This is not required, but provides a conventional way for clients of the MBean to discover the change. See also the immutableInfo andinfoTimeout fields in the MBeanInfo Descriptor.

The contents of the MBeanInfo for a Dynamic MBean are determined by its getMBeanInfo() method. This includes Open MBeans and Model MBeans, which are kinds of Dynamic MBeans.

The contents of the MBeanInfo for a Standard MBean are determined by the MBean server as follows:

• getClassName() returns the Java class name of the MBean object;
• getConstructors() returns the list of all public constructors in that object;
• getAttributes() returns the list of all attributes whose existence is deduced from the presence in the MBean interface of a get_Name_, is_Name_, orset_Name_ method that conforms to the conventions for Standard MBeans;
• getOperations() returns the list of all methods in the MBean interface that do not represent attributes;
• getNotifications() returns an empty array if the MBean does not implement the NotificationBroadcaster interface, otherwise the result of calling NotificationBroadcaster.getNotificationInfo() on it;
• getDescriptor() returns a descriptor containing the contents of any descriptor annotations in the MBean interface (see@DescriptorKey).

The description returned by getDescription() and the descriptions of the contained attributes and operations are not specified.

The remaining details of the MBeanInfo for a Standard MBean are not specified. This includes the description of any contained constructors, and notifications; the names of parameters to constructors and operations; and the descriptions of constructor parameters.

Since:

1.5

See Also:

Serialized Form

• Constructor Summary

Constructors

• Method Summary

• Constructor Details

  • MBeanInfo

  Constructs an MBeanInfo.
  Parameters:
  className - The name of the Java class of the MBean described by this MBeanInfo. This value may be any syntactically legal Java class name. It does not have to be a Java class known to the MBean server or to the MBean's ClassLoader. If it is a Java class known to the MBean's ClassLoader, it is recommended but not required that the class's public methods include those that would appear in a Standard MBean implementing the attributes and operations in this MBeanInfo.
  description - A human readable description of the MBean (optional).
  attributes - The list of exposed attributes of the MBean. This may be null with the same effect as a zero-length array.
  constructors - The list of public constructors of the MBean. This may be null with the same effect as a zero-length array.
  operations - The list of operations of the MBean. This may be null with the same effect as a zero-length array.
  notifications - The list of notifications emitted. This may be null with the same effect as a zero-length array.
  Throws:
  [IllegalArgumentException](../../../java.base/java/lang/IllegalArgumentException.html "class in java.lang")

  • MBeanInfo

  Constructs an MBeanInfo.
  Parameters:
  className - The name of the Java class of the MBean described by this MBeanInfo. This value may be any syntactically legal Java class name. It does not have to be a Java class known to the MBean server or to the MBean's ClassLoader. If it is a Java class known to the MBean's ClassLoader, it is recommended but not required that the class's public methods include those that would appear in a Standard MBean implementing the attributes and operations in this MBeanInfo.
  description - A human readable description of the MBean (optional).
  attributes - The list of exposed attributes of the MBean. This may be null with the same effect as a zero-length array.
  constructors - The list of public constructors of the MBean. This may be null with the same effect as a zero-length array.
  operations - The list of operations of the MBean. This may be null with the same effect as a zero-length array.
  notifications - The list of notifications emitted. This may be null with the same effect as a zero-length array.
  descriptor - The descriptor for the MBean. This may be null which is equivalent to an empty descriptor.
  Throws:
  [IllegalArgumentException](../../../java.base/java/lang/IllegalArgumentException.html "class in java.lang")
  Since:
  1.6

• Method Details

  • clone

  Returns a shallow clone of this instance. The clone is obtained by simply calling super.clone(), thus calling the default native shallow cloning mechanism implemented by Object.clone(). No deeper cloning of any internal field is made.
  Since this class is immutable, the clone method is chiefly of interest to subclasses.
  Overrides:
  [clone](../../../java.base/java/lang/Object.html#clone%28%29) in class [Object](../../../java.base/java/lang/Object.html "class in java.lang")
  Returns:
  a clone of this instance.
  See Also:
  Cloneable

  • getClassName

  public String getClassName()
  Returns the name of the Java class of the MBean described by this MBeanInfo.
  Returns:
  the class name.

  • getDescription

  public String getDescription()
  Returns a human readable description of the MBean.
  Returns:
  the description.

  • getAttributes

  Returns the list of attributes exposed for management. Each attribute is described by an MBeanAttributeInfo object. The returned array is a shallow copy of the internal array, which means that it is a copy of the internal array of references to the MBeanAttributeInfo objects but that each referenced MBeanAttributeInfo object is not copied.
  Returns:
  An array of MBeanAttributeInfo objects.

  • getOperations

  Returns the list of operations of the MBean. Each operation is described by an MBeanOperationInfo object. The returned array is a shallow copy of the internal array, which means that it is a copy of the internal array of references to the MBeanOperationInfo objects but that each referenced MBeanOperationInfo object is not copied.
  Returns:
  An array of MBeanOperationInfo objects.

  • getConstructors

  Returns the list of the public constructors of the MBean. Each constructor is described by anMBeanConstructorInfo object.
  The returned array is a shallow copy of the internal array, which means that it is a copy of the internal array of references to the MBeanConstructorInfo objects but that each referenced MBeanConstructorInfo object is not copied.
  The returned list is not necessarily exhaustive. That is, the MBean may have a public constructor that is not in the list. In this case, the MBean server can construct another instance of this MBean's class using that constructor, even though it is not listed here.
  Returns:
  An array of MBeanConstructorInfo objects.

  • getNotifications

  Returns the list of the notifications emitted by the MBean. Each notification is described by an MBeanNotificationInfo object. The returned array is a shallow copy of the internal array, which means that it is a copy of the internal array of references to the MBeanNotificationInfo objects but that each referenced MBeanNotificationInfo object is not copied.
  Returns:
  An array of MBeanNotificationInfo objects.

  • getDescriptor

  Get the descriptor of this MBeanInfo. Changing the returned value will have no affect on the original descriptor.
  Specified by:
  [getDescriptor](DescriptorRead.html#getDescriptor%28%29) in interface [DescriptorRead](DescriptorRead.html "interface in javax.management")
  Returns:
  a descriptor that is either immutable or a copy of the original.
  Since:
  1.6

  • equals

  public boolean equals​(Object o)
  Compare this MBeanInfo to another. Two MBeanInfo objects are equal if and only if they return equal values for getClassName(), for getDescription(), and forgetDescriptor(), and the arrays returned by the two objects for getAttributes(), getOperations(), getConstructors(), and getNotifications() are pairwise equal. Here "equal" means Object.equals(Object), not identity.
  If two MBeanInfo objects return the same values in one of their arrays but in a different order then they are not equal.
  Overrides:
  [equals](../../../java.base/java/lang/Object.html#equals%28java.lang.Object%29) in class [Object](../../../java.base/java/lang/Object.html "class in java.lang")
  Parameters:
  o - the object to compare to.
  Returns:
  true if and only if o is an MBeanInfo that is equal to this one according to the rules above.
  See Also:
  Object.hashCode(), HashMap