Interface: javax.management.modelmbean.ModelMBeanInfo

  • public interface ModelMBeanInfo
This interface is implemented by the ModelMBeanInfo for every ModelMBean. An implementation of this interface must be shipped with every JMX Agent.

Java resources wishing to be manageable instantiate the ModelMBean using the MBeanServer's createMBean method. The resource then sets the ModelMBeanInfo and Descriptors for the ModelMBean instance. The attributes, operations, and notifications exposed via the ModelMBeanInfo for the ModelMBean comprise the management interface and are accessible from MBeans, connectors/adaptors like other MBeans. Through the Descriptors, values and methods in the managed application can be defined and mapped to attributes and operations of the ModelMBean. This mapping can be defined during development in a file or dynamically and programmatically at runtime.

Every ModelMBean which is instantiated in the MBeanServer becomes manageable: its attributes, operations, and notifications become remotely accessible through the connectors/adaptors connected to that MBeanServer. A Java object cannot be registered in the MBeanServer unless it is a JMX compliant MBean. By instantiating a ModelMBean, resources are guaranteed that the MBean is valid. MBeanException and RuntimeOperationsException must be thrown on every public method. This allows for wrapping exceptions from distributed communications (RMI, EJB, etc.)

Since:
@since 1.5

Methods

  • clonetop

    public Object clone()
    Creates and returns a copy of this object.
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  • getAttributetop

    public ModelMBeanAttributeInfo getAttribute(String inName) throws MBeanException, RuntimeOperationsException
    Returns a ModelMBeanAttributeInfo requested by name.
    Parameters:
    @param inName The name of the ModelMBeanAttributeInfo to get. If no ModelMBeanAttributeInfo exists for this name null is returned.
    Return:
    @return the attribute info for the named attribute, or null if there is none.
    Exceptions:
    @exception MBeanException Wraps a distributed communication Exception.
    @exception RuntimeOperationsException Wraps an IllegalArgumentException for a null attribute name.
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  • getAttributestop

    public MBeanAttributeInfo[] getAttributes()
    Returns the list of attributes exposed for management. Each attribute is described by an MBeanAttributeInfo object.
    Return:
    @return An array of MBeanAttributeInfo objects.
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  • getClassNametop

    public String getClassName()
    Returns the name of the Java class of the MBean described by this MBeanInfo.
    Return:
    @return the Java class name.
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  • getConstructorstop

    public MBeanConstructorInfo[] getConstructors()
    Returns the list of the public constructors of the MBean. Each constructor is described by an MBeanConstructorInfo object.
    Return:
    @return An array of MBeanConstructorInfo objects.
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  • getDescriptiontop

    public String getDescription()
    Returns a human readable description of the MBean.
    Return:
    @return the description.
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  • getDescriptortop

    public Descriptor getDescriptor(String inDescriptorName, String inDescriptorType) throws MBeanException, RuntimeOperationsException
    Returns a Descriptor requested by name and descriptorType.
    Parameters:
    @param inDescriptorName The name of the descriptor.
    @param inDescriptorType The type of the descriptor being requested. If this is null or empty then all types are searched. Valid types are 'mbean', 'attribute', 'constructor' 'operation', and 'notification'. This value will be equal to the 'descriptorType' field in the descriptor that is returned.
    Return:
    @return Descriptor containing the descriptor for the ModelMBean with the same name and descriptorType. If no descriptor is found, null is returned.
    Exceptions:
    @exception MBeanException Wraps a distributed communication Exception.
    @exception RuntimeOperationsException Wraps an IllegalArgumentException for a null descriptor name or null or invalid type. The type must be "mbean","attribute", "constructor", "operation", or "notification".
    See:
    @see javax.management.modelmbean.ModelMBeanInfo.setDescriptor(javax.management.Descriptor, java.lang.String)
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  • getDescriptorstop

    public Descriptor[] getDescriptors(String inDescriptorType) throws MBeanException, RuntimeOperationsException
    Returns a Descriptor array consisting of all Descriptors for the ModelMBeanInfo of type inDescriptorType.
    Parameters:
    @param inDescriptorType value of descriptorType field that must be set for the descriptor to be returned. Must be "mbean", "attribute", "operation", "constructor" or "notification". If it is null or empty then all types will be returned.
    Return:
    @return Descriptor array containing all descriptors for the ModelMBean if type inDescriptorType.
    Exceptions:
    @exception MBeanException Wraps a distributed communication Exception.
    @exception RuntimeOperationsException Wraps an IllegalArgumentException when the descriptorType in parameter is not one of: "mbean", "attribute", "operation", "constructor", "notification", empty or null.
    See:
    @see javax.management.modelmbean.ModelMBeanInfo.setDescriptors(javax.management.Descriptor[])
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  • getMBeanDescriptortop

    public Descriptor getMBeanDescriptor() throws MBeanException, RuntimeOperationsException
    Returns the ModelMBean's descriptor which contains MBean wide policies. This descriptor contains metadata about the MBean and default policies for persistence and caching.

    The fields in the descriptor are defined, but not limited to, the following: 

     name           : MBean name
 descriptorType : must be "mbean"
 displayName    : name of attribute to be used in displays
 persistPolicy  : OnUpdate|OnTimer|NoMoreOftenThan|OnUnregister|Always|Never
 persistLocation : The fully qualified directory name where the MBean should be persisted (if appropriate)
 persistFile    : File name into which the MBean should be persisted
 persistPeriod  : seconds - frequency of persist cycle for OnTime and NoMoreOftenThan PersistPolicy
 currencyTimeLimit : how long value is valid, <0 never, =0 always, >0 seconds
 log            : where t: log all notifications f: log no notifications
 logfile        : fully qualified filename to log events to
 visibility     : 1-4 where 1: always visible 4: rarely visible
 export         : name to be used to export/expose this MBean so that it is findable by
                  other JMX Agents.
 presentationString : xml formatted string to allow presentation of data to be associated with the MBean.

    The default descriptor is: name=className,descriptorType="mbean", displayName=className, persistPolicy="never",log="F",export="F",visibility="1" If the descriptor does not contain all these fields, they will be added with these default values.

    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.

    Return:
    @return the MBean descriptor.
    Exceptions:
    @exception MBeanException Wraps a distributed communication Exception.
    @exception RuntimeOperationsException a RuntimeException occurred while getting the descriptor.
    See:
    @see javax.management.modelmbean.ModelMBeanInfo.setMBeanDescriptor(javax.management.Descriptor)
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  • getNotificationtop

    public ModelMBeanNotificationInfo getNotification(String inName) throws MBeanException, RuntimeOperationsException
    Returns a ModelMBeanNotificationInfo requested by name.
    Parameters:
    @param inName The name of the ModelMBeanNotificationInfo to get. If no ModelMBeanNotificationInfo exists for this name null is returned.
    Return:
    @return the info for the named notification, or null if there is none.
    Exceptions:
    @exception MBeanException Wraps a distributed communication Exception.
    @exception RuntimeOperationsException Wraps an IllegalArgumentException for a null notification name.
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  • getNotificationstop

    public MBeanNotificationInfo[] getNotifications()
    Returns the list of the notifications emitted by the MBean. Each notification is described by an MBeanNotificationInfo object.

    In addition to any notification specified by the application, a ModelMBean may always send also two additional notifications:

    • One with descriptor name "GENERIC" and displayName "jmx.modelmbean.generic"
    • Second is a standard attribute change notification with descriptor name "ATTRIBUTE_CHANGE" and displayName "jmx.attribute.change"
    Thus any implementation of ModelMBeanInfo should always add those two notifications in addition to those specified by the application.
    Return:
    @return An array of MBeanNotificationInfo objects.
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  • getOperationtop

    public ModelMBeanOperationInfo getOperation(String inName) throws MBeanException, RuntimeOperationsException
    Returns a ModelMBeanOperationInfo requested by name.
    Parameters:
    @param inName The name of the ModelMBeanOperationInfo to get. If no ModelMBeanOperationInfo exists for this name null is returned.
    Return:
    @return the operation info for the named operation, or null if there is none.
    Exceptions:
    @exception MBeanException Wraps a distributed communication Exception.
    @exception RuntimeOperationsException Wraps an IllegalArgumentException for a null operation name.
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  • getOperationstop

    public MBeanOperationInfo[] getOperations()
    Returns the list of operations of the MBean. Each operation is described by an MBeanOperationInfo object.
    Return:
    @return An array of MBeanOperationInfo objects.
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  • setDescriptortop

    public void setDescriptor(Descriptor inDescriptor, String inDescriptorType) throws MBeanException, RuntimeOperationsException
    Sets descriptors in the info array of type inDescriptorType for the ModelMBean. The setDescriptor method of the corresponding ModelMBean*Info will be called to set the specified descriptor.
    Parameters:
    @param inDescriptor The descriptor to be set in the ModelMBean. It must NOT be null. All descriptors must have name and descriptorType fields.
    @param inDescriptorType The type of the descriptor being set. If this is null then the descriptorType field in the descriptor is used. If specified this value must be set in the descriptorType field in the descriptor. Must be "mbean","attribute", "constructor", "operation", or "notification".
    Exceptions:
    @exception RuntimeOperationsException Wraps an IllegalArgumentException for illegal or null arguments or if the name field of the descriptor is not found in the corresponding MBeanAttributeInfo or MBeanConstructorInfo or MBeanNotificationInfo or MBeanOperationInfo.
    @exception MBeanException Wraps a distributed communication Exception.
    See:
    @see javax.management.modelmbean.ModelMBeanInfo.getDescriptor(java.lang.String, java.lang.String)
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  • setDescriptorstop

    public void setDescriptors(Descriptor[] inDescriptors) throws MBeanException, RuntimeOperationsException
    Adds or replaces descriptors in the ModelMBeanInfo.
    Parameters:
    @param inDescriptors The descriptors to be set in the ModelMBeanInfo. Null elements of the list will be ignored. All descriptors must have name and descriptorType fields.
    Exceptions:
    @exception RuntimeOperationsException Wraps an IllegalArgumentException for a null or invalid descriptor.
    @exception MBeanException Wraps a distributed communication Exception.
    See:
    @see javax.management.modelmbean.ModelMBeanInfo.getDescriptors(java.lang.String)
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  • setMBeanDescriptortop

    public void setMBeanDescriptor(Descriptor inDescriptor) throws MBeanException, RuntimeOperationsException
    Sets the ModelMBean's descriptor. This descriptor contains default, MBean wide metadata about the MBean and default policies for persistence and caching. This operation does a complete replacement of the descriptor, no merging is done. If the descriptor to set to is null then the default descriptor will be created. The default descriptor is: name=className,descriptorType="mbean", displayName=className, persistPolicy="never",log="F",export="F",visibility="1" If the descriptor does not contain all these fields, they will be added with these default values. See getMBeanDescriptor method javadoc for description of valid field names.
    Parameters:
    @param inDescriptor the descriptor to set.
    Exceptions:
    @exception MBeanException Wraps a distributed communication Exception.
    @exception RuntimeOperationsException Wraps an IllegalArgumentException for invalid descriptor.
    See:
    @see javax.management.modelmbean.ModelMBeanInfo.getMBeanDescriptor()
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