Using JMX with Enterprise JavaBeans - JMX in Action - page 359

state of the workflow, and the setState() method tells the workflow bean to jump
ahead to a certain state. Notice that the state value is represented by a String . The
MBean that the EJB creates will expose these methods as its management interface.

The WorkflowBean class
Listing 14.9 contains the code for the WorkflowBean class. It implements meth-
ods that correspond to both the home and remote interfaces (although it doesn't
implement these interfaces). After discussing the code for the EJB , we will begin
examining the code for the MBean of this EJB .

Listing 14.9 WorkflowBean.java

package jmxbook.ch14;

import java.io.*;
import java.sql.*;
import java.util.*;
import javax.ejb.*;
import javax.naming.*;
import javax.sql.*;
import javax.management.*;

public class WorkflowBean implements EntityBean
{
private DataSource ds = null;
private EntityContext ctx = null;
private String clientID = null;
private int state = -1;

public void advanceState()
{
state++;
}

public String getState()
{
return state + "";
}

B

Implement
business
methods

public void setState( String state )
{
this.state = Integer.parseInt( state );
}

C

Load EJB

public void ejbLoad()
{
Connection conn = null;
PreparedStatement ps = null;
clientID = ( String ) ctx.getPrimaryKey();

try