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/*
* MBeanServerBuilder.java
*
* Created on August 22, 2003, 3:25 PM
*/
package com.sun.enterprise.admin.server.core.jmx;
import javax.management.MBeanServer;
import javax.management.MBeanServerDelegate;
import javax.management.MBeanServerBuilder;
import java.util.logging.Logger;
import com.sun.enterprise.admin.common.constant.AdminConstants;
import java.util.logging.Level;
import com.sun.enterprise.interceptor.DynamicInterceptor;
import com.sun.enterprise.util.FeatureAvailability;
/**
* AppServer MBSBuilder for PE set as the value for javax.management.initial.builder
* in the environment. This builder extends from javax.management.MBeanServerBuilder
* and creates MBS with app server interceptors based on a flag. This flag can only be
* turned in this package and is called by the AppServerMBeanServerFactory.
*
* @author sridatta
*/
public class AppServerMBeanServerBuilder extends javax.management.MBeanServerBuilder {
private static final MBeanServerBuilder defaultBuilder = new MBeanServerBuilder();
protected static final Logger _logger = Logger.getLogger(AdminConstants.kLoggerName);
private static MBeanServer _defaultMBeanServer = null;
/** Creates a new instance of MBeanServerBuilder */
public AppServerMBeanServerBuilder() {
}
/**
* This method creates a new MBeanServer implementation object. When creating a new
* MBeanServer the MBeanServerFactory first calls newMBeanServerDelegate() in
* order to obtain a new MBeanServerDelegate for the new MBeanServer. Then it
* calls newMBeanServer(defaultDomain,outer,delegate) passing the delegate that
* should be used by the MBeanServer implementation.
* Note that the passed delegate might not be directly the MBeanServerDelegate that
* was returned by this implementation. It could be, for instance, a new object
* wrapping the previously returned delegate.
*
* The outer parameter is a pointer to the MBeanServer that should be passed
* to the MBeanRegistration interface when registering MBeans inside the
* MBeanServer. If outer is null, then the MBeanServer implementation must
* use its own this reference when invoking the MBeanRegistration interface.
*
* This makes it possible for a MBeanServer implementation to wrap another MBeanServer
* implementation, in order to implement, e.g, security checks, or to prevent
* access to the actual MBeanServer implementation by returning a pointer to a wrapping object.
*
* Parameters:
* defaultDomain - Default domain of the new MBeanServer.
* outer - A pointer to the MBeanServer object that must be passed to the MBeans when invoking their MBeanRegistration interface.
* delegate - A pointer to the MBeanServerDelegate associated with the new MBeanServer. The new MBeanServer must register this MBean in its MBean repository.
* Returns:
* A new private implementation of an MBeanServer.
*
*
* Note that this method is sychronized on the class for the
* case when user requests an MBS during creation on Sun's mbs.
* This can seldom happen but needs to be a safe code.
*
*/
public MBeanServer newMBeanServer(String defaultDomain,
MBeanServer outer,
MBeanServerDelegate delegate) {
MBeanServer mbeanServer = null;
synchronized (AppServerMBeanServerBuilder.class) {
/*
We *must* create the first MBeanServer as our special one. Later MBeanServers
can be the standard JMX one.
*/
if ( _defaultMBeanServer == null ) { // first time
mbeanServer = newAppServerMBeanServer(defaultDomain, delegate);
_defaultMBeanServer = mbeanServer;
}
else {
mbeanServer = defaultBuilder.newMBeanServer(
defaultDomain, outer, delegate);
}
}
_logger.log(Level.FINE, "MBeanServer class = " +
mbeanServer.getClass().getName() );
return mbeanServer;
}
/**
* creates a jmx MBeanServer
* creates a AppServerInterceptor and sets the jmx mbean server
* to it. It then wraps any additional interceptors (nothing for PE)
*
* Note that the "outer" is SunoneInterceptor and not the additional interceptors
* added in addInterceptor. (commented out for now for testing purposes. Need
* to comeback to this. FIXME.)
*
* returns AppServerMBS
*
*/
protected MBeanServer newAppServerMBeanServer(String defaultDomain,
MBeanServerDelegate delegate) {
// we cannot yet create the SunoneInterceptor; it will be inserted
// later by the AdminService
final DynamicInterceptor result = new DynamicInterceptor();
final MBeanServer jmxMBS = defaultBuilder.newMBeanServer(
defaultDomain, result, delegate);
result.setDelegateMBeanServer( jmxMBS );
return result;
}
/**
* This method creates a new MBeanServerDelegate for a new MBeanServer.
* When creating a new MBeanServer the MBeanServerFactory first calls
* this method in order to create a new MBeanServerDelegate.
* Then it calls newMBeanServer(defaultDomain,outer,delegate) passing the delegate
* that should be used by the MBeanServer implementation.
* Note that the passed delegate might not be directly the MBeanServerDelegate that
* was returned by this method. It could be, for instance, a new object wrapping
* the previously returned object.
*
* return the MBeanServerDelegate from jmx defaultBuilder
*/
public MBeanServerDelegate newMBeanServerDelegate() {
return defaultBuilder.newMBeanServerDelegate();
}
/**
* This method is used to set the state whether to create jmx mbs
* or AppServer mbs. This method is package specific.
static void enableAppServerMBeanServer(boolean flag) {
createAppServerMBeanServer = flag;
}
*/
/**
* whether to create AppServer or just the vanilla jmx ri mbs
* @return boolean
static protected boolean createAppServerMBeanServer() {
return createAppServerMBeanServer;
}
*/
/**
* jmx ri default builder
*/
static protected MBeanServerBuilder getDefaultBuilder() {
return defaultBuilder;
}
} |
