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package com.sun.enterprise.admin.event;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;
import java.util.Iterator;
import com.sun.enterprise.admin.event.AdminEvent;
import com.sun.enterprise.config.ConfigContext;
import com.sun.enterprise.config.ConfigChange;
import com.sun.enterprise.config.ConfigAdd;
import com.sun.enterprise.config.ConfigSet;
import com.sun.enterprise.config.ConfigUpdate;
import com.sun.enterprise.config.ConfigDelete;
import com.sun.enterprise.config.serverbeans.ServerTags;
import com.sun.enterprise.admin.meta.MBeanRegistry;
import com.sun.enterprise.admin.meta.MBeanRegistryFactory;
import com.sun.enterprise.admin.meta.MBeanRegistryEntry;
import com.sun.enterprise.admin.meta.naming.MBeanNamingDescriptor;
import com.sun.enterprise.admin.target.Target;
import com.sun.enterprise.admin.target.TargetBuilder;
import com.sun.enterprise.admin.meta.MBeanMetaException;
//i18n import
import com.sun.enterprise.util.i18n.StringManager;
/**
* Config Element Change Helper - class providing ElementChangeEvent
* related services (events constructing/ change lists filtering etc.
*
*/
public class ElementChangeHelper{
/**
* Event type
*/
static final String eventType = ElementChangeHelper.class.getName();
// i18n StringManager
private static StringManager localStrings = StringManager.getManager( ElementChangeHelper.class );
private static String PROPERTY_SUBSTR = "/"+ServerTags.ELEMENT_PROPERTY+"[";
//**********************************************************************
public ElementChangeHelper()
{
}
//**********************************************************************
static boolean isChangesToMerge(ConfigChange change1, ConfigChange change2)
{
String xpath1, xpath2;
if( change1==null || change2==null ||
(xpath1 = change1.getXPath())==null ||
(xpath2 = change2.getXPath())==null ||
!compareXPathes( xpath1, xpath2) )
return false;
if(isPropertyXPath(xpath2)) //optimize it later
return true;
return ( xpath1.equals(change2.getXPath()) &&
change1.getClass().equals(change2.getClass()) );
}
//***************************************************************************
static boolean checkChangeListForElement(ArrayList list)
{
if(list==null || list.size()<=0)
return false;
for(int i=1; i<list.size(); i++)
if(!isChangesToMerge((ConfigChange)list.get(i-1), (ConfigChange)list.get(i)))
return false;
return true;
}
//***************************************************************************
static boolean isPropertyChange(ConfigChange change)
{
String xpath;
return (change!=null &&
(xpath = change.getXPath())!=null &&
(xpath.indexOf(PROPERTY_SUBSTR))>=0 );
}
//***************************************************************************
static boolean isPropertyXPath(String xpath)
{
return ((xpath != null) && ((xpath.indexOf(PROPERTY_SUBSTR))>=0));
}
//***************************************************************************
// getting the primary key of config element
static String getConfigElementPrimaryKey(String xpath)
{
if (xpath != null) {
xpath = xpath.trim();
}
if((xpath!= null) && (xpath.endsWith("']")))
{
int idx = xpath.lastIndexOf('\'', xpath.length()-3);
return xpath.substring(idx+1, xpath.length()-2);
}
return null;
}
//***************************************************************************
// getting the type of config element
static String getConfigElementType(String xpath)
{
if(xpath.trim().endsWith("]"))
xpath = xpath.substring(0, xpath.lastIndexOf('['));
return xpath.substring(0, xpath.lastIndexOf('/'));
}
//***************************************************************************
// get target name for event
static String getConfigElementTargetName(String xpath, ConfigContext ctx)
{
String targetName = null;
try {
// Get target name for event
TargetBuilder targetBuilder = new TargetBuilder();
return targetBuilder.getTargetNameForXPath(xpath, ctx, true);
} catch(Exception e)
{
//can not find target -> get default (domain)
}
return null;
}
//***************************************************************************
static String getElementXPath(ArrayList changes)
{
return getElementXPath((ConfigChange)changes.get(0));
}
static String getElementXPath(ConfigChange change)
{
String xpath = change.getXPath();
if(xpath==null)
return xpath;
int iMatch = xpath.indexOf(PROPERTY_SUBSTR);
if(iMatch<0)
return xpath;
return xpath.substring(0, iMatch);
}
//***************************************************************************
static int getActionCodeForChanges(ArrayList changes)
{
return getActionCodeForChange((ConfigChange)changes.get(0));
}
static int getActionCodeForChange(ConfigChange change)
{
if(isPropertyXPath(change.getXPath()))
return ElementChangeEvent.ACTION_ELEMENT_UPDATE;
int action;
//set action code
if(change instanceof ConfigSet)
action = ElementChangeEvent.ACTION_ELEMENT_CREATE;
else if(change instanceof ConfigAdd)
action = ElementChangeEvent.ACTION_ELEMENT_CREATE;
else if(change instanceof ConfigUpdate)
action = ElementChangeEvent.ACTION_ELEMENT_UPDATE;
else if(change instanceof ConfigDelete)
action = ElementChangeEvent.ACTION_ELEMENT_DELETE;
else
action = ElementChangeEvent.ACTION_ELEMENT_UNDEFINED;
return action;
}
//***************************************************************************
static private boolean compareXPathes(String xpath1, String xpath2)
{
int iProp;
if((iProp = xpath1.indexOf(PROPERTY_SUBSTR))>0)
xpath1 = xpath1.substring(0, iProp);
if((iProp = xpath2.indexOf(PROPERTY_SUBSTR))>0)
xpath2 = xpath2.substring(0, iProp);
return xpath1.equals(xpath2);
}
/*
* generate the array of ElementChangeEvents from given change list
* @param changeList list of ConfigChanges to analyse
* @param domainContext ConfigContext of domaiin.xml config file
* @returns array of ElementChangeEvents
* @throws IllegalArgumentException
*/
public AdminEvent[] generateElementChangeEventsFromChangeList(String instanceName, ArrayList changeList, ConfigContext domainContext)
{
ArrayList merged = new ArrayList();
ArrayList events = new ArrayList();
ConfigChange change, lastChange = null;
for(int i=0; i<changeList.size(); i++)
{
change = (ConfigChange)changeList.get(i);
if(merged.isEmpty() ||
isChangesToMerge(lastChange, change))
{
//add change to list
merged.add(change);
lastChange = change;
}
else
{
//here we are only if collected changes portion completed
// it is time to create ElementChangeEvent
if(!merged.isEmpty())
{
ArrayList new_events = createEventsForElementChange(instanceName, merged, domainContext, changeList);
if(new_events!=null && new_events.size()>0)
events.addAll(new_events);
//FIXME: - do we need treat empty answer as "restart is needed" sign?
merged.clear();
//add change to list
merged.add(change);
lastChange = change;
}
}
}
// last portion could be here
if(!merged.isEmpty())
{
ArrayList new_events = createEventsForElementChange(instanceName, merged, domainContext, changeList);
if(new_events!=null && new_events.size()>0)
events.addAll(new_events);
//FIXME: - do we need treat empty answer as "restart is needed" sign?
}
return (AdminEvent[])events.toArray(new AdminEvent[events.size()]);
}
/*
* create ElementChangeEvents from given change list
* (all changes should be related to the same element)
* @param changeList list of ConfigChanges related to the same element
* @param domainContext ConfigContext of domaiin.xml config file
* @returns array of ElementChangeEvent (or null)
* @throws IllegalArgumentException
*/
public ArrayList createEventsForElementChange(String instanceName, ArrayList changeList, ConfigContext domainContext, ArrayList globalChangeList)
{
return createEventsForElementChange(instanceName, changeList, domainContext, true, globalChangeList);
}
private ArrayList createEventsForElementChange(String instanceName, ArrayList changeList, ConfigContext domainContext, boolean bCheckList, ArrayList globalChangeList)
{
if(bCheckList && !checkChangeListForElement(changeList))
{
String msg = localStrings.getString( "admin.event.wrong_configchange" );
throw new IllegalArgumentException( msg );
}
String xpath0 = getElementXPath(changeList);
if(xpath0==null)
return null;
// instantiate the proper Event
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// 1. get event name
MBeanRegistryEntry entry = getRegistryEntry(xpath0);
if(entry==null)
return null;
String eventName = entry.getElementChangeEventName();
if(eventName!=null && eventName.indexOf('.')<0)
eventName = EVENT_PACKAGE_PATH_PREFIX + eventName;
if(eventName==null)
return null; //element is not a subject for ElementChangeEvent
// 2. instantiate event
try {
return ElementChangeEventsFactory.createEvents(eventName, instanceName,
entry.getName(), changeList, domainContext, globalChangeList);
} catch(Exception e)
{
e.printStackTrace();
String msg = localStrings.getString( "admin.event.cannot_create_eventforchange", eventName, xpath0 );
throw new IllegalArgumentException( msg );
}
}
String lastXpath = null;
MBeanRegistryEntry lastEntry = null;
static final public String EVENT_PACKAGE_PATH_PREFIX = "com.sun.enterprise.admin.event.";
private synchronized MBeanRegistryEntry getRegistryEntry(String xpath)
{
if(xpath.equals(lastXpath))
return lastEntry;
MBeanRegistry registry = MBeanRegistryFactory.getAdminMBeanRegistry();
MBeanRegistryEntry entry = registry.findMBeanRegistryEntryByXPath(xpath);
if(entry!=null)
{
lastXpath = xpath;
lastEntry = entry;
}
return entry;
}
static public Set getXPathesForDynamicallyNotReconfigurableElements(ArrayList changeList)
{
HashSet xpathes = new HashSet();
if(changeList==null)
return xpathes;
MBeanRegistry registry = MBeanRegistryFactory.getAdminMBeanRegistry();
String xpath_last = null;
MBeanRegistryEntry entry = null;
boolean bLastEntryHasEvent = false;
String propertyName = null;
for(int i=0; i<changeList.size();i++)
{
ConfigChange change = (ConfigChange)changeList.get(i);
int action = getActionCodeForChange(change);
if(action==ElementChangeEvent.ACTION_ELEMENT_UNDEFINED)
continue; //??? not add/set/update/delete
String xpath = change.getXPath();
// Check if this xpath belongs to one of the excluded
// XPaths. Excluded xpaths include lb-configs, lb-config
// etc. Where restart checks do not apply.
if ( (xpath == null) || isXPathExcludedForRestartCheck(xpath) ) {
continue;
}
if(!xpath.equals(xpath_last))
{
xpath_last = xpath;
if(isPropertyXPath(change.getXPath()))
{
propertyName = getConfigElementPrimaryKey(xpath);
xpath = getElementXPath(change);
}
else
{
propertyName = null;
}
entry = registry.findMBeanRegistryEntryByXPath(xpath);
if(entry==null)
{
xpathes.add(xpath);
continue;
}
bLastEntryHasEvent = (entry.getElementChangeEventName()!=null);
}
if(bLastEntryHasEvent)
continue;
// check whether creation reconfigurable
if( (action==ElementChangeEvent.ACTION_ELEMENT_CREATE &&
entry.isElementCreationDynamicallyReconfigurable()))
{
xpathes.add(xpath);
continue;
}
// check whether deletion reconfigurable
if( (action==ElementChangeEvent.ACTION_ELEMENT_DELETE &&
entry.isElementDeletionDynamicallyReconfigurable()))
{
xpathes.add(xpath);
continue;
}
// check properties changes
if(propertyName!=null)
{
if(!entry.isPropertyDynamicallyReconfigurable(propertyName))
{
xpathes.add(xpath);
continue;
}
}
if ( !(change instanceof ConfigUpdate))
{
xpathes.add(xpath);
continue;
}
//here we are only for attributes
Set attrs = ((ConfigUpdate)change).getAttributeSet();
Iterator iter = attrs.iterator();
while(iter.hasNext())
{
String attr = (String)iter.next();
// check if dynamic reconfig is needed for the attribute, bug# 6509963
try {
if (! entry.isAttributeDynamicReconfigNeeded(attr))
{
break;
}
} catch (MBeanMetaException mme)
{
//field not found in registry
}
if(!entry.isAttributeDynamicallyReconfigurable(attr))
{
xpathes.add(xpath);
break;
}
}
}
return xpathes;
}
/**
* Get a boolean value corresponding to the string value in xml.
* @param strValue the string representing a boolean
* @return true if the string is "true", "yes", "on" or "1"
*/
public static boolean getBooleanValue(String strValue) {
boolean retval = false;
if (strValue == null) {
return retval;
}
if (strValue.equalsIgnoreCase("true")
|| strValue.equalsIgnoreCase("yes")
|| strValue.equalsIgnoreCase("on")
|| strValue.equalsIgnoreCase("1")) {
retval = true;
}
return retval;
}
/**
* Checks if an XPath is excluded for restart required check.
* Restart required check is skipped for lb-configs and lb-config
* elements.
*
* @param xpath XPath of the config change
*
* @return boolean true - if restart required check to be ignored, false
* otherwise
*/
private static boolean isXPathExcludedForRestartCheck(String xpath)
{
if (xpath == null) {
return false;
}
for(int excludeIdx =0; excludeIdx < restartExcludeXPaths.length;
excludeIdx++) {
if ( xpath.startsWith(restartExcludeXPaths[excludeIdx]) ) {
return true;
}
}
return false;
}
/*
* finds "enabled" update element in change-list and returns its new value (as Boolean)
* or null if not found
*/
public static Boolean findEnabledChange(ArrayList changeList)
{
if(changeList==null)
return null;
for(int i=changeList.size()-1; i>=0; i--)
{
if ( changeList.get(i) instanceof ConfigUpdate)
{
ConfigUpdate update = (ConfigUpdate)changeList.get(i);
String enableStr = update.getNewValue(ServerTags.ENABLED);
if (enableStr != null)
return new Boolean(ElementChangeHelper.getBooleanValue(enableStr));
}
}
return null;
}
// remove enable config change from the config change list
public static ConfigChange removeEnabledChange(ArrayList changeList)
{
if(changeList==null)
return null;
for(int i=changeList.size()-1; i>=0; i--)
{
if ( changeList.get(i) instanceof ConfigUpdate)
{
ConfigUpdate update = (ConfigUpdate)changeList.get(i);
String enableStr = update.getNewValue(ServerTags.ENABLED);
if (enableStr != null) {
return (ConfigChange)changeList.remove(i);
}
}
}
return null;
}
// PRIVATE VARIABLES
// The XPath prefixes are excluded during restart required check.
// These XPaths belong to lb-configs and lb-config element
private static String[] restartExcludeXPaths = { "/domain/lb-configs","/domain/load-balancers" };
}
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