JDK8/Java8源码在线阅读
/*
* Copyright (c) 2000, 2013, 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.
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/*
* @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.security.AccessController;
import java.util.logging.Level;
import javax.management.Descriptor;
import javax.management.DescriptorAccess;
import javax.management.MBeanNotificationInfo;
import javax.management.RuntimeOperationsException;
/**
* <p>The ModelMBeanNotificationInfo object describes a notification emitted
* by a ModelMBean.
* It is a subclass of MBeanNotificationInfo with the addition of an
* associated Descriptor and an implementation of the Descriptor interface.</p>
*
* <P id="descriptor">
* 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.</P>
*
* <table border="1" cellpadding="5" summary="ModelMBeanNotificationInfo Fields">
* <tr><th>Name</th><th>Type</th><th>Meaning</th></tr>
* <tr><td>name</td><td>String</td>
* <td>Notification name.</td></tr>
* <tr><td>descriptorType</td><td>String</td>
* <td>Must be "notification".</td></tr>
* <tr><td>severity</td><td>Number</td>
* <td>0-6 where 0: unknown; 1: non-recoverable;
* 2: critical, failure; 3: major, severe;
* 4: minor, marginal, error; 5: warning;
* 6: normal, cleared, informative</td></tr>
* <tr><td>messageID</td><td>String</td>
* <td>Unique key for message text (to allow translation, analysis).</td></tr>
* <tr><td>messageText</td><td>String</td>
* <td>Text of notification.</td></tr>
* <tr><td>log</td><td>String</td>
* <td>T - log message, F - do not log message.</td></tr>
* <tr><td>logfile</td><td>String</td>
* <td>fully qualified file name appropriate for operating system.</td></tr>
* <tr><td>visibility</td><td>Number</td>
* <td>1-4 where 1: always visible 4: rarely visible.</td></tr>
* <tr><td>presentationString</td><td>String</td>
* <td>XML formatted string to allow presentation of data.</td></tr>
* </table>
*
* <p>The default descriptor contains the name, descriptorType,
* displayName and severity(=6) fields. The default value of the name
* and displayName fields is the name of the Notification class (as
* specified by the <code>name</code> parameter of the
* ModelMBeanNotificationInfo constructor).</p>
*
* <p>The <b>serialVersionUID</b> of this class is <code>-7445681389570207141L</code>.
*
* @since 1.5
*/
@SuppressWarnings("serial") // serialVersionUID is not constant
public class ModelMBeanNotificationInfo
extends MBeanNotificationInfo
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 = -5211564525059047097L;
//
// Serial version for new serial form
private static final long newSerialVersionUID = -7445681389570207141L;
//
// Serializable fields in old serial form
private static final ObjectStreamField[] oldSerialPersistentFields =
{
new ObjectStreamField("notificationDescriptor", Descriptor.class),
new ObjectStreamField("currClass", String.class)
};
//
// Serializable fields in new serial form
private static final ObjectStreamField[] newSerialPersistentFields =
{
new ObjectStreamField("notificationDescriptor", Descriptor.class)
};
//
// Actual serial version and serial form
private static final long serialVersionUID;
/**
* @serialField notificationDescriptor Descriptor The descriptor
* containing the appropriate metadata for this instance
*/
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 descriptor containing the appropriate metadata for
* this instance
*/
private Descriptor notificationDescriptor;
private static final String currClass = "ModelMBeanNotificationInfo";
/**
* Constructs a ModelMBeanNotificationInfo object with a default
* descriptor.
*
* @param notifTypes The array of strings (in dot notation) containing
* the notification types that may be emitted.
* @param name The name of the Notification class.
* @param description A human readable description of the
* Notification. Optional.
**/
public ModelMBeanNotificationInfo(String[] notifTypes,
String name,
String description) {
this(notifTypes,name,description,null);
}
/**
* Constructs a ModelMBeanNotificationInfo object.
*
* @param notifTypes The array of strings (in dot notation)
* containing the notification types that may be emitted.
* @param name The name of the Notification class.
* @param description A human readable description of the Notification.
* Optional.
* @param descriptor An instance of Descriptor containing the
* appropriate metadata for this instance of the
* MBeanNotificationInfo. If it is null a default descriptor
* will be created. If the descriptor does not contain the
* fields "displayName" or "severity",
* the missing ones are added with their default values.
*
* @exception RuntimeOperationsException Wraps an
* {@link IllegalArgumentException}. The descriptor is invalid, or
* descriptor field "name" is not equal to parameter name, or
* descriptor field "descriptorType" is not equal to "notification".
*
**/
public ModelMBeanNotificationInfo(String[] notifTypes,
String name,
String description,
Descriptor descriptor) {
super(notifTypes, name, description);
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanNotificationInfo.class.getName(),
"ModelMBeanNotificationInfo", "Entry");
}
notificationDescriptor = validDescriptor(descriptor);
}
/**
* Constructs a new ModelMBeanNotificationInfo object from this
* ModelMBeanNotfication Object.
*
* @param inInfo the ModelMBeanNotificationInfo to be duplicated
*
**/
public ModelMBeanNotificationInfo(ModelMBeanNotificationInfo inInfo) {
this(inInfo.getNotifTypes(),
inInfo.getName(),
inInfo.getDescription(),inInfo.getDescriptor());
}
/**
* Creates and returns a new ModelMBeanNotificationInfo which is a
* duplicate of this ModelMBeanNotificationInfo.
**/
public Object clone () {
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanNotificationInfo.class.getName(),
"clone()", "Entry");
}
return(new ModelMBeanNotificationInfo(this));
}
/**
* Returns a copy of the associated Descriptor for the
* ModelMBeanNotificationInfo.
*
* @return Descriptor associated with the
* ModelMBeanNotificationInfo object.
*
* @see #setDescriptor
**/
public Descriptor getDescriptor() {
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanNotificationInfo.class.getName(),
"getDescriptor()", "Entry");
}
if (notificationDescriptor == null) {
// Dead code. Should never happen.
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanNotificationInfo.class.getName(),
"getDescriptor()", "Descriptor value is null, " +
"setting descriptor to default values");
}
notificationDescriptor = validDescriptor(null);
}
return((Descriptor)notificationDescriptor.clone());
}
/**
* Sets associated Descriptor (full replace) for the
* ModelMBeanNotificationInfo 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
* ModelMBeanNotification interface
*
* @exception RuntimeOperationsException Wraps an
* {@link IllegalArgumentException} for invalid Descriptor.
*
* @see #getDescriptor
**/
public void setDescriptor(Descriptor inDescriptor) {
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanNotificationInfo.class.getName(),
"setDescriptor(Descriptor)", "Entry");
}
notificationDescriptor = validDescriptor(inDescriptor);
}
/**
* Returns a human readable string containing
* ModelMBeanNotificationInfo.
*
* @return a string describing this object.
**/
public String toString() {
if (MODELMBEAN_LOGGER.isLoggable(Level.FINER)) {
MODELMBEAN_LOGGER.logp(Level.FINER,
ModelMBeanNotificationInfo.class.getName(),
"toString()", "Entry");
}
final StringBuilder retStr = new StringBuilder();
retStr.append("ModelMBeanNotificationInfo: ")
.append(this.getName());
retStr.append(" ; Description: ")
.append(this.getDescription());
retStr.append(" ; Descriptor: ")
.append(this.getDescriptor());
retStr.append(" ; Types: ");
String[] nTypes = this.getNotifTypes();
for (int i=0; i < nTypes.length; i++) {
if (i > 0) retStr.append(", ");
retStr.append(nTypes[i]);
}
return retStr.toString();
}
/**
* 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:
* descriptorType="notification",displayName=this.getName(),
* name=this.getName(),severity="6"
*
*
* @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", "notification");
MODELMBEAN_LOGGER.finer("Defaulting descriptorType to \"notification\"");
}
if (clone.getFieldValue("displayName") == null) {
clone.setField("displayName",this.getName());
MODELMBEAN_LOGGER.finer("Defaulting Descriptor displayName to " + this.getName());
}
if (clone.getFieldValue("severity") == null) {
clone.setField("severity", "6");
MODELMBEAN_LOGGER.finer("Defaulting Descriptor severity field to 6");
}
//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"))) {
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