EJB Tutorial from JBoss: Clustered Entity : Cluster « EJB3 « Java
EJB Tutorial from JBoss: Clustered Entity
File: Contact.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, 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.tutorial.clusteredentity.bean;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue; import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
/**
*
* @author <a href="mailto:kabir.khan@jboss.org">Kabir Khan</a>
* @version $Revision$
*/
@Entity
@Cache (usage=CacheConcurrencyStrategy.TRANSACTIONAL)
public class Contact implements Serializable
{
Long id;
String name;
String tlf;
Customer customer;
public Contact()
{
}
@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
public Long getId()
{
return id;
}
public void setId(Long long1)
{
id = long1;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public String getTlf()
{
return tlf;
}
public void setTlf(String tlf)
{
this.tlf = tlf;
}
@ManyToOne
@JoinColumn(name="CUST_ID")
public Customer getCustomer()
{
return customer;
}
public void setCustomer(Customer customer)
{
this.customer = customer;
}
}
File: Customer.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, 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.tutorial.clusteredentity.bean;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue; import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
/**
* Company customer
*
* @author Emmanuel Bernard
* @author Kabir Khan
*/
@Entity
@Cache (usage=CacheConcurrencyStrategy.TRANSACTIONAL)
public class Customer implements java.io.Serializable
{
Long id;
String name;
private Set<Contact> contacts;
public Customer()
{
}
@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
public Long getId()
{
return id;
}
public void setId(Long long1)
{
id = long1;
}
public String getName()
{
return name;
}
public void setName(String string)
{
name = string;
}
@Cache (usage=CacheConcurrencyStrategy.TRANSACTIONAL)
@OneToMany(mappedBy="customer", fetch=FetchType.EAGER, cascade=CascadeType.ALL)
public Set<Contact> getContacts()
{
return contacts;
}
public void setContacts(Set<Contact> contacts)
{
this.contacts = contacts;
}
}
File: EntityTest.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, 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.tutorial.clusteredentity.bean;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision$
*/
public interface EntityTest
{
Customer createCustomer();
Customer findByCustomerId(Long id);
boolean isCustomerInCache(Long id);
boolean isContactInCache(Long id);
boolean isCustomerContactsInCache(Long id);
}
File: EntityTestBean.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, 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.tutorial.clusteredentity.bean;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.hibernate.cache.entry.CacheEntry;
import org.hibernate.cache.entry.CollectionCacheEntry;
import org.jboss.cache.CacheException;
import org.jboss.cache.Fqn;
import org.jboss.cache.Node;
import org.jboss.cache.TreeCache;
import org.jboss.cache.TreeCacheMBean;
import org.jboss.mx.util.MBeanProxyExt;
import org.jboss.mx.util.MBeanServerLocator;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision$
*/
@Stateless
@Remote(EntityTest.class)
public class EntityTestBean implements EntityTest
{
@PersistenceContext
private EntityManager manager;
public Customer createCustomer()
{
Customer customer = new Customer();
customer.setName("JBoss");
Set<Contact> contacts = new HashSet<Contact>();
Contact kabir = new Contact();
kabir.setCustomer(customer);
kabir.setName("Kabir");
kabir.setTlf("1111");
contacts.add(kabir);
Contact bill = new Contact();
bill.setCustomer(customer);
bill.setName("Bill");
bill.setTlf("2222");
contacts.add(bill);
customer.setContacts(contacts);
manager.persist(customer);
return customer;
}
public Customer findByCustomerId(Long id)
{
return manager.find(Customer.class, id);
}
public boolean isCustomerInCache(Long id)
{
try
{
TreeCache cache = getCache();
String key = "/org/jboss/tutorial/clusteredentity/bean/Customer/org.jboss.tutorial.clusteredentity.bean.Customer#" + id;
return isInCache(cache, key);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
public boolean isContactInCache(Long id)
{
try
{
TreeCache cache = getCache();
String key = "/org/jboss/tutorial/clusteredentity/bean/Contact/org.jboss.tutorial.clusteredentity.bean.Contact#" + id;
return isInCache(cache, key);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
public boolean isCustomerContactsInCache(Long id)
{
try
{
TreeCache cache = getCache();
String key = "/org/jboss/tutorial/clusteredentity/bean/Customer/contacts/org.jboss.tutorial.clusteredentity.bean.Customer.contacts#" + id;
return isInCache(cache, key);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
private TreeCache getCache() throws Exception
{
MBeanServer server = MBeanServerLocator.locateJBoss();
TreeCacheMBean proxy = (TreeCacheMBean)MBeanProxyExt.create(TreeCacheMBean.class, new ObjectName("jboss.cache:service=EJB3EntityTreeCache"), server);
return proxy.getInstance();
}
private boolean isInCache(TreeCache cache, String key)throws CacheException
{
return isInCache(cache, null, key);
}
private boolean isInCache(TreeCache cache, Node node, String key) throws CacheException
{
//Not the best way to look up the cache entry, but how hibernate creates the cache entry
//and fqn seems to be buried deep deep down inside hibernate...
if (node == null)
{
node = cache.get("/");
}
Map map = node.getChildren();
for(Object child : map.values())
{
Node childNode = (Node)child;
Fqn fqn = childNode.getFqn();
if (fqn.toString().equals(key))
{
Object entry = childNode.getData().get("item");
return (entry != null) && (entry instanceof CacheEntry || entry instanceof CollectionCacheEntry);
}
Map children = childNode.getChildren();
if (children != null && children.size() > 0)
{
if (isInCache(cache, childNode, key))
{
return true;
}
}
}
return false;
}
}
File: CachedEntityRun.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, 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.tutorial.clusteredentity.client;
import java.util.Properties;
import java.util.Set;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.jboss.tutorial.clusteredentity.bean.Contact;
import org.jboss.tutorial.clusteredentity.bean.Customer;
import org.jboss.tutorial.clusteredentity.bean.EntityTest;
/**
*
* @author <a href="mailto:kabir.khan@jboss.org">Kabir Khan</a>
* @version $Revision$
*/
public class CachedEntityRun
{
public static void main(String[] args)throws NamingException
{
if (args.length != 2)
{
throw new RuntimeException("You need to pass in two parameters of the type ipaddress:port");
}
Properties prop1 = new Properties();
prop1.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
prop1.put("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
prop1.put("java.naming.provider.url", "jnp://" + args[0]);
Properties prop2 = new Properties();
prop2.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
prop2.put("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
prop2.put("java.naming.provider.url", "jnp://" + args[1]);
System.out.println("Saving customer to node 1");
InitialContext ctx1 = new InitialContext(prop1);
EntityTest tester1 = (EntityTest)ctx1.lookup("EntityTestBean/remote");
Customer customer = tester1.createCustomer();
customer = tester1.findByCustomerId(customer.getId());
System.out.println("Looking for customer in node 2's cache");
InitialContext ctx2 = new InitialContext(prop2);
EntityTest tester2 = (EntityTest)ctx1.lookup("EntityTestBean/remote");
if(!tester2.isCustomerInCache(customer.getId()))
{
throw new RuntimeException("Could not find Customer in node2's cache");
}
System.out.println("Found customer " + customer.getId() + " in node2 cache");
if (!tester2.isCustomerContactsInCache(customer.getId()))
{
throw new RuntimeException("Could not find Customer contacts in node2's cache");
}
System.out.println("Found contacts collection for " + customer.getId() + " in node2 cache");
Set<Contact> contacts = customer.getContacts();
for (Contact contact : contacts)
{
if (!tester2.isContactInCache(contact.getId()))
{
throw new RuntimeException("Could not find Contact in node2's cache");
}
System.out.println("Found contact " + contact.getId() + " collection in node2 cache");
}
customer = tester2.findByCustomerId(customer.getId());
if (customer == null)
{
throw new RuntimeException("Customer was not found in node 2");
}
System.out.println("Lookup of customer from node2 worked (via cache)");
System.out.println("Customer: id=" + customer.getId() + "; name=" + customer.getName());
for (Contact contact : contacts)
{
System.out.println("\tContact: id=" + contact.getId() + "; name=" + contact.getName());
}
}
}
jboss-EJB-3.0_RC9_Patch_1.zip( 10,289 k)Related examples in the same category
| 1. | EJB Tutorial from JBoss: clustering | |