/*
* Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package javax.management;
import com.sun.jmx.defaults.
JmxProperties;
import com.sun.jmx.defaults.
ServiceName;
import com.sun.jmx.mbeanserver.
Util;
/**
* Represents the MBean server from the management point of view.
* The MBeanServerDelegate MBean emits the MBeanServerNotifications when
* an MBean is registered/unregistered in the MBean server.
*
* @since 1.5
*/
public class
MBeanServerDelegate implements
MBeanServerDelegateMBean,
NotificationEmitter {
/** The MBean server agent identification.*/
private
String mbeanServerId ;
/** The NotificationBroadcasterSupport object that sends the
notifications */
private final
NotificationBroadcasterSupport broadcaster;
private static long
oldStamp = 0;
private final long
stamp;
private long
sequenceNumber = 1;
private static final
MBeanNotificationInfo[]
notifsInfo;
static {
final
String[]
types = {
MBeanServerNotification.
UNREGISTRATION_NOTIFICATION,
MBeanServerNotification.
REGISTRATION_NOTIFICATION
};
notifsInfo = new
MBeanNotificationInfo[1];
notifsInfo[0] =
new
MBeanNotificationInfo(
types,
"javax.management.MBeanServerNotification",
"Notifications sent by the MBeanServerDelegate MBean");
}
/**
* Create a MBeanServerDelegate object.
*/
public
MBeanServerDelegate () {
stamp =
getStamp();
broadcaster = new
NotificationBroadcasterSupport() ;
}
/**
* Returns the MBean server agent identity.
*
* @return the identity.
*/
public synchronized
String getMBeanServerId() {
if (
mbeanServerId == null) {
String localHost;
try {
localHost = java.net.
InetAddress.
getLocalHost().
getHostName();
} catch (java.net.
UnknownHostException e) {
JmxProperties.
MISC_LOGGER.
finest("Can't get local host name, " +
"using \"localhost\" instead. Cause is: "+
e);
localHost = "localhost";
}
mbeanServerId =
localHost + "_" +
stamp;
}
return
mbeanServerId;
}
/**
* Returns the full name of the JMX specification implemented
* by this product.
*
* @return the specification name.
*/
public
String getSpecificationName() {
return
ServiceName.
JMX_SPEC_NAME;
}
/**
* Returns the version of the JMX specification implemented
* by this product.
*
* @return the specification version.
*/
public
String getSpecificationVersion() {
return
ServiceName.
JMX_SPEC_VERSION;
}
/**
* Returns the vendor of the JMX specification implemented
* by this product.
*
* @return the specification vendor.
*/
public
String getSpecificationVendor() {
return
ServiceName.
JMX_SPEC_VENDOR;
}
/**
* Returns the JMX implementation name (the name of this product).
*
* @return the implementation name.
*/
public
String getImplementationName() {
return
ServiceName.
JMX_IMPL_NAME;
}
/**
* Returns the JMX implementation version (the version of this product).
*
* @return the implementation version.
*/
public
String getImplementationVersion() {
try {
return
System.
getProperty("java.runtime.version");
} catch (
SecurityException e) {
return "";
}
}
/**
* Returns the JMX implementation vendor (the vendor of this product).
*
* @return the implementation vendor.
*/
public
String getImplementationVendor() {
return
ServiceName.
JMX_IMPL_VENDOR;
}
// From NotificationEmitter extends NotificationBroacaster
//
public
MBeanNotificationInfo[]
getNotificationInfo() {
final int
len =
MBeanServerDelegate.
notifsInfo.length;
final
MBeanNotificationInfo[]
infos =
new
MBeanNotificationInfo[
len];
System.
arraycopy(
MBeanServerDelegate.
notifsInfo,0,
infos,0,
len);
return
infos;
}
// From NotificationEmitter extends NotificationBroacaster
//
public synchronized
void
addNotificationListener(
NotificationListener listener,
NotificationFilter filter,
Object handback)
throws
IllegalArgumentException {
broadcaster.
addNotificationListener(
listener,
filter,
handback) ;
}
// From NotificationEmitter extends NotificationBroacaster
//
public synchronized
void
removeNotificationListener(
NotificationListener listener,
NotificationFilter filter,
Object handback)
throws
ListenerNotFoundException {
broadcaster.
removeNotificationListener(
listener,
filter,
handback) ;
}
// From NotificationEmitter extends NotificationBroacaster
//
public synchronized
void
removeNotificationListener(
NotificationListener listener)
throws
ListenerNotFoundException {
broadcaster.
removeNotificationListener(
listener) ;
}
/**
* Enables the MBean server to send a notification.
* If the passed <var>notification</var> has a sequence number lesser
* or equal to 0, then replace it with the delegate's own sequence
* number.
* @param notification The notification to send.
*
*/
public void
sendNotification(
Notification notification) {
if (
notification.
getSequenceNumber() < 1) {
synchronized (this) {
notification.
setSequenceNumber(this.
sequenceNumber++);
}
}
broadcaster.
sendNotification(
notification);
}
/**
* Defines the default ObjectName of the MBeanServerDelegate.
*
* @since 1.6
*/
public static final
ObjectName DELEGATE_NAME =
Util.
newObjectName("JMImplementation:type=MBeanServerDelegate");
/* Return a timestamp that is monotonically increasing even if
System.currentTimeMillis() isn't (for example, if you call this
constructor more than once in the same millisecond, or if the
clock always returns the same value). This means that the ids
for a given JVM will always be distinact, though there is no
such guarantee for two different JVMs. */
private static synchronized long
getStamp() {
long
s =
System.
currentTimeMillis();
if (
oldStamp >=
s) {
s =
oldStamp + 1;
}
oldStamp =
s;
return
s;
}
}