private PersisterMBean findPersister() throws MBeanException, InstanceNotFoundException {
Logger logger = getLogger();
ModelMBeanInfo info = getModelMBeanInfo();
if (info == null) {
// Not yet initialized
if (logger.isEnabledFor(Logger.TRACE))
logger.trace("Can't find persister, ModelMBeanInfo is null");
return null;
}
Descriptor mbeanDescriptor = info.getMBeanDescriptor();
if (mbeanDescriptor == null) {
// This is normally should not happen if ModelMBeanInfoSupport is used
if (logger.isEnabledFor(Logger.TRACE))
logger.trace("Can't find persister, MBean descriptor is null");
return null;
}
String location = (String) mbeanDescriptor.getFieldValue("persistLocation");
String name = (String) mbeanDescriptor.getFieldValue("persistName");
String mbeanName = (String) mbeanDescriptor.getFieldValue("name");
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("Persistence fields: location=" + location + ", name=" + name);
if (mbeanName == null && name == null) {
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("Persistence is not supported by this ModelMBean");
return null;
}
// Try to see if this mbean should delegate to another mbean
if (name != null) {
try {
ObjectName objectName = new ObjectName(name.trim());
// OK, a valid object name
MBeanServer server = getMBeanServer();
if (server == null)
throw new MBeanException(
new IllegalStateException(
LocalizedStrings.MX4JModelMBean_MX4JMODELMBEAN_IS_NOT_REGISTERED
.toLocalizedString()));
if (server.isRegistered(objectName)
&& server.isInstanceOf(objectName, PersisterMBean.class.getName())) {
// OK, the given mbean is registered with this mbean server
PersisterMBean persister = new MBeanPersister(server, objectName);
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("Persistence is delegated to this MBean: " + objectName);
return persister;
} else {
throw new InstanceNotFoundException(objectName.toString());
}
} catch (MalformedObjectNameException ignored) {
// It does not delegates to another mbean, use default
if (logger.isEnabledFor(Logger.TRACE))
logger.trace("Persistence is not delegated to another MBean");
}
// Default is serialization to file
FilePersister persister = new FilePersister(location, name);
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("Persistence is realized through file system in " + persister.getFileName());
return persister;
} else {
// Only location given, use MBean name
FilePersister persister = new FilePersister(location, mbeanName);
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("Persistence is realized through file system in " + persister.getFileName());
return persister;
}
}
private Logger findLogger(Descriptor descriptor) {
Logger logger = getLogger();
if (descriptor == null) {
if (logger.isEnabledFor(Logger.TRACE))
logger.trace("Can't find MBean logger, descriptor is null");
return null;
}
String log = (String) descriptor.getFieldValue("log");
String location = (String) descriptor.getFieldValue("logFile");
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("Log fields: log=" + log + ", file=" + location);
if (log == null || !Boolean.valueOf(log).booleanValue()) {
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("Logging is not supported by this ModelMBean");
return null;
}
// Logger is supported, where log to ?
if (location == null) {
// As an extension, see if the field logMBean has been defined
location = (String) descriptor.getFieldValue("logMBean");
if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("Log fields: mbean=" + location);
if (location == null) {
if (logger.isEnabledFor(Logger.TRACE))
logger.trace("Logging is not supported by this ModelMBean");
return null;
}
// It seems that the user wants to delegate a registered mbean to log
try {
ObjectName objectName = new ObjectName(location);
MBeanServer server = getMBeanServer();
if (server == null)
throw new MBeanException(
new IllegalStateException(
LocalizedStrings.MX4JModelMBean_MX4JMODELMBEAN_IS_NOT_REGISTERED
.toLocalizedString()));
if (server.isRegistered(objectName)) {
MBeanLogger l = new MBeanLogger(server, objectName);
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("ModelMBean log supported by delegating to this MBean: " + objectName);
return l;
}
return null;
} catch (MalformedObjectNameException x) {
// Ah, was not a correct object name
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("Specified logMBean field does not contain a valid ObjectName: " + location);
return null;
} catch (MBeanException x) {
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug(
"logMBean field does not specify an MBean that supports logging delegation", x);
return null;
}
} else {
// User decided to log to a file
if (logger.isEnabledFor(Logger.DEBUG))
logger.debug("ModelMBean log supported on file system");
return new FileLogger(location);
}
}