MessageCheckerEJB.java

/*
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package beans;

import connector.MyAdminObject;

import javax.ejb.*;
import java.util.Properties;
import java.sql.*;
import java.rmi.RemoteException;

import javax.naming.*;
import javax.sql.*;
import javax.annotation.Resource;
import javax.validation.*;

@Stateless
public class MessageCheckerEJB implements SessionBean {

    @Resource
    Validator beanValidator ;


    @Resource
    ValidatorFactory validatorFactory;


    private int WAIT_TIME = 15;
    private String user = "j2ee";
    private String password = "j2ee";
    private Properties beanProps = null;
    private SessionContext sessionContext = null;
    private Connection heldCon = null;
    private MyAdminObject Controls;

    public MessageCheckerEJB() {
    }

    private void initialize(){
        try{
        InitialContext ic = new InitialContext();
        validatorFactory = (javax.validation.ValidatorFactory)ic.lookup(
               "java:comp/env/ValidatorFactory");
        System.out.println("Bean Validator Factory : " + validatorFactory);
        }catch(Exception e){
            System.out.println("Bean Validator Factory setup failure " + e);
        }

        try{
        InitialContext ic = new InitialContext();
        beanValidator = (javax.validation.Validator)ic.lookup(
               "java:comp/env/Validator");
        System.out.println("Bean Validator : " + beanValidator);
        }catch(Exception e){
            System.out.println("Bean Validator setup failure " + e);
        }
    }

    public void ejbCreate() 
        throws CreateException {
        System.out.println("bean created");
        heldCon = null;
    }

    public boolean done() {
        return Controls.done();
    }

    public int expectedResults() {
        return Controls.expectedResults();
    }

    public boolean testAdminObject(String jndiName, boolean expectLookupSuccess) {
        boolean failed = false;
        try{
            Context ic = new InitialContext();
            ic.lookup(jndiName);
        }catch(NameNotFoundException e){
            failed = true;
        }catch(NamingException ne){
            failed = isConstraintViolationException(ne.getCause(), jndiName);
        }
        return !failed==expectLookupSuccess;
    }

    public boolean testRA(int intValue){
        try{
            initialize();
            InitialContext ic = new InitialContext();
            MyAdminObject mao = (MyAdminObject)ic.lookup("eis/testAdmin");
            return mao.testRA(intValue, beanValidator);
        }catch(NamingException ne){
            return false;
        }
    }

    public void notifyAndWait() {
        try {
            synchronized (Controls.getLockObject()) {
                //Tell the resource adapter the client is ready to run
                Controls.getLockObject().notifyAll(); 
                
                debug("NOTIFIED... START WAITING");
                //Wait until being told to read from the database
                Controls.getLockObject().wait(); 
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public int getMessageCount() {
	try {
            Connection con = getFreshConnection();
            int count1 = getCount(con);
            con.close();
            
	    /*
            synchronized(Controls.getLockObject()) {
                Controls.getLockObject().notify();
            }
	    */
                
            return count1;
        } catch (Exception e) {
            e.printStackTrace(System.out);
            throw new EJBException(e);
	}
    }

    private int getCount(Connection con) throws SQLException {
        Statement stmt = con.createStatement();
        int count = 0;
        String messages = "";
        ResultSet result = stmt.executeQuery(
                "SELECT messageId, message "+ "FROM messages");
        while (result.next()) {
            count++;
            messages = messages + " - " + result.getString("messageId")+" "+
                result.getString("message") + "\n";
        }
        messages = messages + "count = " + count;
        System.out.println(messages);
        stmt.close();
        return count;
    }

    public void setSessionContext(SessionContext context) {
        sessionContext = context;
        try {
            Context ic = new InitialContext();
            user = (String) ic.lookup("java:comp/env/user");
            password = (String) ic.lookup("java:comp/env/password");
	    Controls = (MyAdminObject) ic.lookup("java:comp/env/eis/testAdmin");
	    //System.out.println("CALLING INITILIZE");
	    Controls.initialize();
	    //System.out.println("CALLED INITILIZE" + Controls);

/*
            beanValidator = (javax.validation.Validator)ic.lookup(
                   "java:comp/env/Validator");
*/

        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }

    private boolean isConstraintViolationException(Throwable t, String jndiName){
       boolean result = false;
            if(t != null){
            	if(t instanceof javax.validation.ConstraintViolationException){
                        System.out.println("Found Constraint Violation for resource ["+jndiName+"]" + t.getMessage());
                 	result = true;
            	}else{
                 	result = isConstraintViolationException(t.getCause(), jndiName);
            	}
            }
            return result;
    }

    public void ejbRemove() {
        System.out.println("bean removed");
    }

    public void ejbActivate() {
        System.out.println("bean activated");
    }

    public void ejbPassivate() {
        System.out.println("bean passivated");
    }

    private Connection getFreshConnection() throws Exception {
        Connection oldHeldCon = heldCon;
        heldCon = null;
        Connection result = getDBConnection();
        heldCon = oldHeldCon;
        return result;
    }

    private Connection getDBConnection() throws Exception {
        if (heldCon != null) return heldCon;
        Connection con = null;
        try {
            Context ic = new InitialContext();
            DataSource ds = (DataSource) ic.lookup("java:comp/env/MyDB");
            debug("Looked up Datasource\n");
            debug("Get JDBC connection, auto sign on");
            con = ds.getConnection();
            
            if (con != null) {
                return con;
            } else {
                throw new Exception("Unable to get database connection ");
            }
        } catch (SQLException ex1) {
            //ex1.printStackTrace();
            throw ex1;
        }
    }
    
    private void closeConnection(Connection con) throws SQLException {
        if (heldCon != null) {
            return;
        } else {
            con.close();
        }
    }

    private void debug(String msg) {
        System.out.println("[MessageCheckerEJB]:: -> " + msg);
    }
}