/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.test.cmp2.batchcascadedelete.ejb;
public class GrandchildUtil
{
/**
* Cached remote home (EJBHome). Uses lazy loading to obtain its value (loaded by getHome() methods).
*/
private static GrandchildHome cachedRemoteHome = null;
/**
* Cached local home (EJBLocalHome). Uses lazy loading to obtain its value (loaded by getLocalHome() methods).
*/
private static GrandchildLocalHome cachedLocalHome = null;
// Home interface lookup methods
/**
* Obtain remote home interface from default initial context
*
* @return Home interface for Grandchild. Lookup using JNDI_NAME
*/
public static GrandchildHome getHome() throws javax.naming.NamingException
{
if(cachedRemoteHome == null)
{
// Obtain initial context
javax.naming.InitialContext initialContext = new javax.naming.InitialContext();
try
{
java.lang.Object objRef = initialContext.lookup(GrandchildHome.JNDI_NAME);
cachedRemoteHome = (GrandchildHome)javax.rmi.PortableRemoteObject.narrow(objRef, GrandchildHome.class);
}
finally
{
initialContext.close();
}
}
return cachedRemoteHome;
}
/**
* Obtain remote home interface from parameterised initial context
*
* @param environment Parameters to use for creating initial context
* @return Home interface for Grandchild. Lookup using JNDI_NAME
*/
public static GrandchildHome getHome(java.util.Hashtable environment) throws javax.naming.NamingException
{
// Obtain initial context
javax.naming.InitialContext initialContext = new javax.naming.InitialContext(environment);
try
{
java.lang.Object objRef = initialContext.lookup(GrandchildHome.JNDI_NAME);
return (GrandchildHome)javax.rmi.PortableRemoteObject.narrow(objRef, GrandchildHome.class);
}
finally
{
initialContext.close();
}
}
/**
* Obtain local home interface from default initial context
*
* @return Local home interface for Grandchild. Lookup using JNDI_NAME
*/
public static GrandchildLocalHome getLocalHome() throws javax.naming.NamingException
{
// Local homes shouldn't be narrowed, as there is no RMI involved.
if(cachedLocalHome == null)
{
// Obtain initial context
javax.naming.InitialContext initialContext = new javax.naming.InitialContext();
try
{
cachedLocalHome = (GrandchildLocalHome)initialContext.lookup(GrandchildLocalHome.JNDI_NAME);
}
finally
{
initialContext.close();
}
}
return cachedLocalHome;
}
/**
* Cached per JVM server IP.
*/
private static String hexServerIP = null;
// initialise the secure random instance
private static final java.security.SecureRandom seeder = new java.security.SecureRandom();
/**
* A 32 byte GUID generator (Globally Unique ID). These artificial keys SHOULD <strong>NOT </strong> be seen by the user,
* not even touched by the DBA but with very rare exceptions, just manipulated by the database and the programs.
*
* Usage: Add an id field (type java.lang.String) to your EJB, and add setId(XXXUtil.generateGUID(this)); to the ejbCreate method.
*/
public static final String generateGUID(Object o)
{
StringBuffer tmpBuffer = new StringBuffer(16);
if(hexServerIP == null)
{
java.net.InetAddress localInetAddress = null;
try
{
// get the inet address
localInetAddress = java.net.InetAddress.getLocalHost();
}
catch(java.net.UnknownHostException uhe)
{
System.err.println("GrandchildUtil: Could not get the local IP address using InetAddress.getLocalHost()!");
// todo: find better way to get around this...
uhe.printStackTrace();
return null;
}
byte serverIP[] = localInetAddress.getAddress();
hexServerIP = hexFormat(getInt(serverIP), 8);
}
String hashcode = hexFormat(System.identityHashCode(o), 8);
tmpBuffer.append(hexServerIP);
tmpBuffer.append(hashcode);
long timeNow = System.currentTimeMillis();
int timeLow = (int)timeNow & 0xFFFFFFFF;
int node = seeder.nextInt();
StringBuffer guid = new StringBuffer(32);
guid.append(hexFormat(timeLow, 8));
guid.append(tmpBuffer.toString());
guid.append(hexFormat(node, 8));
return guid.toString();
}
private static int getInt(byte bytes[])
{
int i = 0;
int j = 24;
for(int k = 0; j >= 0; k++)
{
int l = bytes[k] & 0xff;
i += l << j;
j -= 8;
}
return i;
}
private static String hexFormat(int i, int j)
{
String s = Integer.toHexString(i);
return padHex(s, j) + s;
}
private static String padHex(String s, int i)
{
StringBuffer tmpBuffer = new StringBuffer();
if(s.length() < i)
{
for(int j = 0; j < i - s.length(); j++)
{
tmpBuffer.append('0');
}
}
return tmpBuffer.toString();
}
}