/**
* Get an attribute value for the given environment. Check JEMBeanHelper.getNeedReset() after this
* call because the helper may detect that the environment has changed and that the MBean metadata
* should be reset.
*
* @param targetEnv The target JE environment. May be null if the environment is not open.
* @param attributeName attribute name.
* @return attribute value.
*/
public Object getAttribute(Environment targetEnv, String attributeName)
throws AttributeNotFoundException, MBeanException {
/* Sanity check. */
if (attributeName == null) {
throw new AttributeNotFoundException("Attribute name cannot be null");
}
/* These attributes are available regardless of environment state. */
try {
if (attributeName.equals(ATT_ENV_HOME)) {
return environmentHome.getCanonicalPath();
} else if (attributeName.equals(ATT_OPEN)) {
boolean envIsOpen = (targetEnv != null);
resetIfOpenStateChanged(envIsOpen);
return new Boolean(envIsOpen);
} else if (attributeName.equals(ATT_SET_READ_ONLY)) {
return new Boolean(openConfig.getReadOnly());
} else if (attributeName.equals(ATT_SET_TRANSACTIONAL)) {
return new Boolean(openConfig.getTransactional());
} else if (attributeName.equals(ATT_SET_SERIALIZABLE)) {
return new Boolean(openConfig.getTxnSerializableIsolation());
} else {
/* The rest are JE environment attributes. */
if (targetEnv != null) {
EnvironmentConfig config = targetEnv.getConfig();
if (attributeName.equals(ATT_IS_READ_ONLY)) {
return new Boolean(config.getReadOnly());
} else if (attributeName.equals(ATT_IS_TRANSACTIONAL)) {
return new Boolean(config.getTransactional());
} else if (attributeName.equals(ATT_CACHE_SIZE)) {
return new Long(config.getCacheSize());
} else if (attributeName.equals(ATT_CACHE_PERCENT)) {
return new Integer(config.getCachePercent());
} else if (attributeName.equals(ATT_LOCK_TIMEOUT)) {
return new Long(config.getLockTimeout());
} else if (attributeName.equals(ATT_IS_SERIALIZABLE)) {
return new Boolean(config.getTxnSerializableIsolation());
} else if (attributeName.equals(ATT_TXN_TIMEOUT)) {
return new Long(config.getTxnTimeout());
} else {
throw new AttributeNotFoundException("attribute " + attributeName + " is not valid.");
}
}
return null;
}
} catch (Exception e) {
/*
* Add both the message and the exception for easiest deciphering
* of the problem. Sometimes the original exception stacktrace gets
* hidden in server logs.
*/
throw new MBeanException(e, e.getMessage());
}
}
