/*
* Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @author IBM Corp.
*
* Copyright IBM Corp. 1999-2000. All rights reserved.
*/
package javax.management.modelmbean;
import static com.sun.jmx.defaults.JmxProperties.MODELMBEAN_LOGGER;
import com.sun.jmx.mbeanserver.GetPropertyAction;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.logging.Level;
import javax.management.Descriptor;
import javax.management.DescriptorKey;
import javax.management.DescriptorAccess;
import javax.management.MBeanAttributeInfo;
import javax.management.RuntimeOperationsException;
/**
* 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.
* <P>
* The fields in the descriptor are defined, but not limited to, the following: <P>
* <PRE>
* name : attribute name
* descriptorType : must be "attribute"
* value : current value for attribute
* default : default value for attribute
* displayName : name of attribute to be used in displays
* getMethod : name of operation descriptor for get method
* setMethod : name of operation descriptor for set method
* protocolMap : object which implements the Descriptor interface: mappings must be appropriate for the attribute
* and entries can be updated or augmented at runtime.
* persistPolicy : OnUpdate|OnTimer|NoMoreOftenThan|OnUnregister|Always|Never
* persistPeriod : seconds - frequency of persist cycle. Used when persistPolicy is"OnTimer" or "NoMoreOftenThan".
* currencyTimeLimit : how long value is valid, <0 never, =0 always, >0 seconds
* lastUpdatedTimeStamp : when value was set
* visibility : 1-4 where 1: always visible 4: rarely visible
* presentationString : xml formatted string to allow presentation of data
* </PRE>
* The default descriptor contains the name, descriptorType and displayName fields.
*
* <p><b>Note:</b> because of inconsistencies in previous versions of
* this specification, it is recommended not to use negative or zero
* values for <code>currencyTimeLimit</code>. To indicate that a
* cached value is never valid, omit the
* <code>currencyTimeLimit</code> field. To indicate that it is
* always valid, use a very large number for this field.</p>
*
* <p>The <b>serialVersionUID</b> of this class is <code>6181543027787327345L</code>.
*
* @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 = createDefaultDescriptor();
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 = createDefaultDescriptor();
// 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);
}
if (descriptor == null)
{
attrDescriptor = createDefaultDescriptor();
} else
{
if (isValid(descriptor))
{
attrDescriptor = (Descriptor) descriptor.clone();
} else
{
throw new RuntimeOperationsException(new IllegalArgumentException("Invalid descriptor passed in parameter"), ("Exception occurred in ModelMBeanAttributeInfo constructor"));
}
}
}
/**
* 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 = createDefaultDescriptor();
}
/**
* 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.
* @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);
}
if (descriptor == null)
{
attrDescriptor = createDefaultDescriptor();
} else
{
if (isValid(descriptor))
{
attrDescriptor = (Descriptor) descriptor.clone();
} else
{
throw new RuntimeOperationsException(new IllegalArgumentException("Invalid descriptor passed in parameter"), ("Exception occurred in ModelMBeanAttributeInfo constructor"));
}
}
}
/**
* 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();
//Descriptor newDesc = inInfo.attrDescriptor;
if ((newDesc != null) && (isValid(newDesc)))
{
attrDescriptor = newDesc;
} else
{
attrDescriptor = createDefaultDescriptor();
}
}
/**
* 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 = createDefaultDescriptor();
}
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)
{
if (inDescriptor == null) {
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"setDescriptor(Descriptor)",
"Received null for new descriptor value, " +
"setting descriptor to default values");
}
attrDescriptor = createDefaultDescriptor();
} else {
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"setDescriptor(Descriptor)",
"Executed for " + inDescriptor.toString());
}
if (isValid(inDescriptor)) {
attrDescriptor = (Descriptor) inDescriptor.clone();
} else {
throw new RuntimeOperationsException(new IllegalArgumentException("Invalid descriptor passed in parameter"),
("Exception occurred in ModelMBeanAttributeInfo setDescriptor"));
}
}
}
/**
* 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.
*/
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.
*/
public String toString()
{
return
"ModelMBeanAttributeInfo: " + this.getName() +
" ; Description: " + this.getDescription() +
" ; Types: " + this.getType() +
" ; isReadable: " + this.isReadable() +
" ; isWritable: " + this.isWritable() +
" ; Descriptor: " + this.getDescriptor();
}
/**
* Creates and returns a Descriptor with default values set:
* descriptorType=attribute,name=this.getName(),displayName=this.getName(),
* persistPolicy=never,visibility=1
*/
private Descriptor createDefaultDescriptor()
{
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"createDefaultDescriptor()", "Entry");
}
return new DescriptorSupport(
new String[] {"descriptorType=attribute",
("name=" + this.getName()),
("displayName=" + this.getName())
});
}
/**
* Tests that the descriptor is valid and adds appropriate default fields not already
* specified. Field values must be correct for field names.
* Descriptor must have the same name as the attribute,the descriptorType field must be "attribute",
* The following fields will be defaulted if they are not already set:
* displayName=this.getName(),persistPolicy=never,visibility=1
*/
private boolean isValid(Descriptor inDesc)
{
// name and descriptor type must be correct
// add in displayName, persistPolicy, visibility if they apply
boolean results=true;
String badField="none";
if (inDesc == null)
{
badField="nullDescriptor";
results = false;
}
else if (!inDesc.isValid())
{ // checks for empty descriptors, null,
// checks for empty name and descriptorType adn valid values for fields.
badField="inValidDescriptor";
results = false;
}
else if (! ((String)inDesc.getFieldValue("name")).equalsIgnoreCase(this.getName()))
{
badField="name";
results = false;
} else
{
if (! ((String)inDesc.getFieldValue("descriptorType")).equalsIgnoreCase("attribute"))
{
badField="desriptorType";
results = false;
} else if ((inDesc.getFieldValue("displayName")) == null)
{
inDesc.setField("displayName",this.getName());
}
}
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanAttributeInfo.class.getName(),
"isValid()", "Returning " + results +
" : Invalid field is " + badField);
}
return results;
}
/**
* 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();
}
}
}