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== EJB Tutorial from JBoss: timer ==



<source lang="java">
File: ExampleTimer.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.timer.bean;

public interface ExampleTimer
{
void scheduleTimer(long milliseconds);
}

File: ExampleTimerBean.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.timer.bean;
import java.util.Date;
import javax.annotation.Resource;
import javax.ejb.Remote;
import javax.ejb.SessionContext;
import javax.ejb.Stateless;
import javax.ejb.Timeout;
import javax.ejb.Timer;
@Stateless
@Remote(ExampleTimer.class)
public class ExampleTimerBean implements ExampleTimer
{
private @Resource SessionContext ctx;
public void scheduleTimer(long milliseconds)
{
ctx.getTimerService().createTimer(new Date(new Date().getTime() + milliseconds), "Hello World");
}
@Timeout
public void timeoutHandler(Timer timer)
{
System.out.println("---------------------");
System.out.println("* Received Timer event: " + timer.getInfo());
System.out.println("---------------------");
timer.cancel();
}
}

File: Client.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.timer.client;
import org.jboss.tutorial.timer.bean.ExampleTimer;
import javax.naming.InitialContext;

public class Client
{
public static void main(String[] args) throws Exception
{
InitialContext ctx = new InitialContext();
ExampleTimer timer = (ExampleTimer) ctx.lookup("ExampleTimerBean/remote");
timer.scheduleTimer(5000);
}
}

</source>



== Timer Service And Timeout Method ==



<source lang="java">

File: EmployeeBean.java
import javax.annotation.Resource;
import javax.ejb.SessionContext;
import javax.ejb.Stateless;
import javax.ejb.Timeout;
import javax.ejb.Timer;
import javax.ejb.TimerService;
@Stateless
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@Resource
private SessionContext ctx;
public EmployeeBean() {
}
public Long addBid(String userId, Long itemId, Double bidPrice) {
System.out.println("Bid for " + itemId + " received with price" + bidPrice);
TimerService timerService = ctx.getTimerService();
Timer timer = timerService.createTimer(123, 86400000, null);
return 0L;
}
@Timeout
public void handleTimeout(Timer timer) {
System.out.println(" handleTimeout called.");
// Put here the code for cleaning the database of day limit orders that have
// not been executed.
}
}

File: EmployeeServiceLocal.java

import javax.ejb.Local;
import javax.jws.WebParam;
@Local
public interface EmployeeServiceLocal {
public Long addBid(String userId,Long itemId,Double bidPrice);

}

File: EmployeeServiceRemote.java
import javax.ejb.Remote;

@Remote
public interface EmployeeServiceRemote {
public Long addBid(String userId,Long itemId,Double bidPrice);
}

File: Employee.java

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
public class Employee implements java.io.Serializable {
private int id;
private String firstName;
private String lastName;
@Id
@GeneratedValue
public int getId() {
return id;
}

@PostRemove
public void postRemove()
{
System.out.println("@PostRemove");
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String first) {
this.firstName = first;
}
public String getLastName() {
return lastName;
}
public void setLastName(String last) {
this.lastName = last;
}
}

File: Main.java
import javax.ejb.EJB;
import javax.naming.InitialContext;

public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new
// InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");

service.addBid("userId",1L,0.1);

}
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

</source>



== Use Timer Service ==



<source lang="java">

File: Employee.java
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
public class Employee implements java.io.Serializable {
private int id;
private String firstName;
private String lastName;
@Id
@GeneratedValue
public int getId() {
return id;
}

@PostRemove
public void postRemove()
{
System.out.println("@PostRemove");
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String first) {
this.firstName = first;
}
public String getLastName() {
return lastName;
}
public void setLastName(String last) {
this.lastName = last;
}
}

File: EmployeeService.java
import java.util.Date;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.ejb.Timeout;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
@Resource
javax.ejb.TimerService timerService;
public EmployeeService() {
}
public void doAction() {
String item = "item 1";
for (Object obj : timerService.getTimers()) {
javax.ejb.Timer timer = (javax.ejb.Timer) obj;
String scheduled = (String) timer.getInfo();
if (scheduled.equals(item)) {
timer.cancel();
}
}
timerService.createTimer(new Date(System.currentTimeMillis() + 1000), item);
}

@Timeout
public void maintenance(javax.ejb.Timer timer) {
System.out.println("TIMEOUT METHOD CALLED");
String scheduled = (String) timer.getInfo();
System.out.println(scheduled);
}
}

File: EmployeeServiceLocal.java

import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
public void doAction();
}

File: EmployeeServiceRemote.java

import java.util.Collection;
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
public void doAction();
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import java.util.Date;
import javax.naming.InitialContext;

public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote");

service.doAction();
}
}

</source>

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Admin: 1 версия

в 18:01, 31 мая 2010