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.
* *| 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
*/
@SuppressWarnings("serial") // serialVersionUID is not constant
public class ModelMBeanAttributeInfo
extends MBeanAttributeInfo
implements DescriptorAccess {
// Serialization compatibility stuff:
// Two serial forms are supported in this class. The selected form depends
// on system property "jmx.serial.form":
// - "1.0" for JMX 1.0
// - any other value for JMX 1.1 and higher
//
// Serial version for old serial form
private static final long oldSerialVersionUID = 7098036920755973145L;
//
// Serial version for new serial form
private static final long newSerialVersionUID = 6181543027787327345L;
//
// Serializable fields in old serial form
private static final ObjectStreamField[] oldSerialPersistentFields =
{
new ObjectStreamField("attrDescriptor", Descriptor.class),
new ObjectStreamField("currClass", String.class)
};
//
// Serializable fields in new serial form
private static final ObjectStreamField[] newSerialPersistentFields =
{
new ObjectStreamField("attrDescriptor", Descriptor.class)
};
//
// Actual serial version and serial form
private static final long serialVersionUID;
/**
* @serialField attrDescriptor Descriptor The {@link Descriptor}
* containing the metadata corresponding to this attribute
*/
private static final ObjectStreamField[] serialPersistentFields;
private static boolean compat = false;
static {
try {
GetPropertyAction act = new GetPropertyAction("jmx.serial.form");
String form = AccessController.doPrivileged(act);
compat = (form != null && form.equals("1.0"));
} catch (Exception e) {
// OK: No compat with 1.0
}
if (compat) {
serialPersistentFields = oldSerialPersistentFields;
serialVersionUID = oldSerialVersionUID;
} else {
serialPersistentFields = newSerialPersistentFields;
serialVersionUID = newSerialVersionUID;
}
}
//
// END Serialization compatibility stuff
/**
* @serial The {@link Descriptor} containing the metadata corresponding to
* this attribute
*/
private Descriptor attrDescriptor = validDescriptor(null);
private final static String currClass = "ModelMBeanAttributeInfo";
/**
* Constructs a ModelMBeanAttributeInfo object with a default
* descriptor. The {@link Descriptor} of the constructed
* object will include fields contributed by any annotations
* on the {@code Method} objects that contain the {@link
* DescriptorKey} meta-annotation.
*
* @param name The name of the attribute.
* @param description A human readable description of the attribute. Optional.
* @param getter The method used for reading the attribute value.
* May be null if the property is write-only.
* @param setter The method used for writing the attribute value.
* May be null if the attribute is read-only.
* @exception IntrospectionException There is a consistency
* problem in the definition of this attribute.
*
*/
public ModelMBeanAttributeInfo(String name,
String description,
Method getter,
Method setter)
throws javax.management.IntrospectionException {
super(name, description, getter, setter);
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"ModelMBeanAttributeInfo(" +
"String,String,Method,Method)",
"Entry", name);
}
attrDescriptor = validDescriptor(null);
// put getter and setter methods in operations list
// create default descriptor
}
/**
* Constructs a ModelMBeanAttributeInfo object. The {@link
* Descriptor} of the constructed object will include fields
* contributed by any annotations on the {@code Method}
* objects that contain the {@link DescriptorKey}
* meta-annotation.
*
* @param name The name of the attribute.
* @param description A human readable description of the attribute. Optional.
* @param getter The method used for reading the attribute value.
* May be null if the property is write-only.
* @param setter The method used for writing the attribute value.
* May be null if the attribute is read-only.
* @param 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.
* @exception IntrospectionException There is a consistency
* problem in the definition of this attribute.
* @exception 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".
*
*/
public ModelMBeanAttributeInfo(String name,
String description,
Method getter,
Method setter,
Descriptor descriptor)
throws javax.management.IntrospectionException {
super(name, description, getter, setter);
// put getter and setter methods in operations list
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"ModelMBeanAttributeInfo(" +
"String,String,Method,Method,Descriptor)",
"Entry", name);
}
attrDescriptor = validDescriptor(descriptor);
}
/**
* Constructs a ModelMBeanAttributeInfo object with a default descriptor.
*
* @param name The name of the attribute
* @param type The type or class name of the attribute
* @param description A human readable description of the attribute.
* @param isReadable True if the attribute has a getter method, false otherwise.
* @param isWritable True if the attribute has a setter method, false otherwise.
* @param isIs True if the attribute has an "is" getter, false otherwise.
*
*/
public ModelMBeanAttributeInfo(String name,
String type,
String description,
boolean isReadable,
boolean isWritable,
boolean isIs)
{
super(name, type, description, isReadable, isWritable, isIs);
// create default descriptor
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"ModelMBeanAttributeInfo(" +
"String,String,String,boolean,boolean,boolean)",
"Entry", name);
}
attrDescriptor = validDescriptor(null);
}
/**
* Constructs a ModelMBeanAttributeInfo object.
*
* @param name The name of the attribute
* @param type The type or class name of the attribute
* @param description A human readable description of the attribute.
* @param isReadable True if the attribute has a getter method, false otherwise.
* @param isWritable True if the attribute has a setter method, false otherwise.
* @param isIs True if the attribute has an "is" getter, false otherwise.
* @param 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.
* @exception 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".
*
*/
public ModelMBeanAttributeInfo(String name,
String type,
String description,
boolean isReadable,
boolean isWritable,
boolean isIs,
Descriptor descriptor)
{
super(name, type, description, isReadable, isWritable, isIs);
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"ModelMBeanAttributeInfo(String,String,String," +
"boolean,boolean,boolean,Descriptor)",
"Entry", name);
}
attrDescriptor = validDescriptor(descriptor);
}
/**
* Constructs a new ModelMBeanAttributeInfo object from this
* ModelMBeanAttributeInfo Object. A default descriptor will
* be created.
*
* @param inInfo the ModelMBeanAttributeInfo to be duplicated
*/
public ModelMBeanAttributeInfo(ModelMBeanAttributeInfo inInfo)
{
super(inInfo.getName(),
inInfo.getType(),
inInfo.getDescription(),
inInfo.isReadable(),
inInfo.isWritable(),
inInfo.isIs());
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"ModelMBeanAttributeInfo(ModelMBeanAttributeInfo)",
"Entry");
}
Descriptor newDesc = inInfo.getDescriptor();
attrDescriptor = validDescriptor(newDesc);
}
/**
* Gets a copy of the associated Descriptor for the
* ModelMBeanAttributeInfo.
*
* @return Descriptor associated with the
* ModelMBeanAttributeInfo object.
*
* @see #setDescriptor
*/
public Descriptor getDescriptor() {
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"getDescriptor()", "Entry");
}
if (attrDescriptor == null) {
attrDescriptor = validDescriptor(null);
}
return((Descriptor)attrDescriptor.clone());
}
/**
* 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.
* @param inDescriptor replaces the Descriptor associated with the
* ModelMBeanAttributeInfo
*
* @exception RuntimeOperationsException Wraps an
* IllegalArgumentException for an invalid Descriptor
*
* @see #getDescriptor
*/
public void setDescriptor(Descriptor inDescriptor) {
attrDescriptor = validDescriptor(inDescriptor);
}
/**
* Creates and returns a new ModelMBeanAttributeInfo which is a duplicate of this ModelMBeanAttributeInfo.
*
* @exception RuntimeOperationsException for illegal value for
* field Names or field Values. If the descriptor construction
* fails for any reason, this exception will be thrown.
*/
@Override
public Object clone()
{
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"clone()", "Entry");
}
return(new ModelMBeanAttributeInfo(this));
}
/**
* Returns a human-readable version of the
* ModelMBeanAttributeInfo instance.
*/
@Override
public String toString()
{
return
"ModelMBeanAttributeInfo: " + this.getName() +
" ; Description: " + this.getDescription() +
" ; Types: " + this.getType() +
" ; isReadable: " + this.isReadable() +
" ; isWritable: " + this.isWritable() +
" ; Descriptor: " + this.getDescriptor();
}
/**
* Clones the passed in Descriptor, sets default values, and checks for validity.
* If the Descriptor is invalid (for instance by having the wrong "name"),
* this indicates programming error and a RuntimeOperationsException will be thrown.
*
* The following fields will be defaulted if they are not already set:
* displayName=this.getName(),name=this.getName(),descriptorType = "attribute"
*
* @param in Descriptor to be checked, or null which is equivalent to
* an empty Descriptor.
* @exception RuntimeOperationsException if Descriptor is invalid
*/
private Descriptor validDescriptor(final Descriptor in) throws RuntimeOperationsException {
Descriptor clone;
boolean defaulted = (in == null);
if (defaulted) {
clone = new DescriptorSupport();
MODELMBEAN_LOGGER.finer("Null Descriptor, creating new.");
} else {
clone = (Descriptor) in.clone();
}
//Setting defaults.
if (defaulted && clone.getFieldValue("name")==null) {
clone.setField("name", this.getName());
MODELMBEAN_LOGGER.finer("Defaulting Descriptor name to " + this.getName());
}
if (defaulted && clone.getFieldValue("descriptorType")==null) {
clone.setField("descriptorType", "attribute");
MODELMBEAN_LOGGER.finer("Defaulting descriptorType to \"attribute\"");
}
if (clone.getFieldValue("displayName") == null) {
clone.setField("displayName",this.getName());
MODELMBEAN_LOGGER.finer("Defaulting Descriptor displayName to " + this.getName());
}
//Checking validity
if (!clone.isValid()) {
throw new RuntimeOperationsException(new IllegalArgumentException("Invalid Descriptor argument"),
"The isValid() method of the Descriptor object itself returned false,"+
"one or more required fields are invalid. Descriptor:" + clone.toString());
}
if (!getName().equalsIgnoreCase((String)clone.getFieldValue("name"))) {
throw new RuntimeOperationsException(new IllegalArgumentException("Invalid Descriptor argument"),
"The Descriptor \"name\" field does not match the object described. " +
" Expected: "+ this.getName() + " , was: " + clone.getFieldValue("name"));
}
if (!"attribute".equalsIgnoreCase((String)clone.getFieldValue("descriptorType"))) {
throw new RuntimeOperationsException(new IllegalArgumentException("Invalid Descriptor argument"),
"The Descriptor \"descriptorType\" field does not match the object described. " +
" Expected: \"attribute\" ," + " was: " + clone.getFieldValue("descriptorType"));
}
return clone;
}
/**
* Deserializes a {@link ModelMBeanAttributeInfo} from an {@link ObjectInputStream}.
*/
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException {
// New serial form ignores extra field "currClass"
in.defaultReadObject();
}
/**
* Serializes a {@link ModelMBeanAttributeInfo} to an {@link ObjectOutputStream}.
*/
private void writeObject(ObjectOutputStream out)
throws IOException {
if (compat)
{
// Serializes this instance in the old serial form
//
ObjectOutputStream.PutField fields = out.putFields();
fields.put("attrDescriptor", attrDescriptor);
fields.put("currClass", currClass);
out.writeFields();
}
else
{
// Serializes this instance in the new serial form
//
out.defaultWriteObject();
}
}
}