rmi.html

jdbc书

<H3>RegistrationHome Interface</H3>

The <A HREF="./Code/rmi/RegistrationHome.java">RegistrationHome</A> interface 
declares the methods implemented by the<CODE>RegistrationServer</CODE> class.  
These methods mirror the Home interface defined in the Enterprise JavaBeans
example. The <CODE>findLowCreditAccounts</CODE> method takes a remote interface
as its only parameter.

<PRE>
package registration;

import java.rmi.*;
import java.util.*;

public interface RegistrationHome extends Remote {
  RegistrationPK create(String theuser, 
	String password, 
	String emailaddress, 
	String creditcard) 
		throws CreateException, 
		RemoteException;

  Registration findByPrimaryKey(RegistrationPK theuser) 
		throws FinderException, RemoteException;

  public void findLowCreditAccounts(ReturnResults rr) 
		throws FinderException, RemoteException;
}
</PRE>

<A NAME="ret"></A>
<H3>ReturnResults Interface</H3>

The <A HREF="./Code/rmi/ReturnResults.java">ReturnResults</A> interface declares the
method implemented by the <CODE>SellerBean</CODE> class.  The
<CODE>updateResults</CODE> method is called from <CODE>RegistrationServer</CODE>.

<PRE>
package registration;

import java.rmi.*;
import java.util.*;

public interface ReturnResults extends Remote {
    public void updateResults(ArrayList results) 
	throws FinderException, RemoteException;
}
</PRE>

<A NAME="seller"></A>
<H3>SellerBean Class</H3>

The <A HREF="./Code/rmi/SellerBean.java">SellerBean</A> class includes
the callback method implementation and calls the <CODE>RegistrationServer</CODE>
object using RMI. The <CODE>updateAccounts</CODE> method is made accessible by
a call to <CODE>UnicastRemoteObject.exportObject(this);</CODE>. The 
<CODE>auditAccounts</CODE> method waits on a <CODE>Boolean</CODE> object.

<P>
The <CODE>updateAccounts</CODE> method sends a notify to all methods
waiting on the <CODE>Boolean</CODE> object when it has been called from the server
and receives the search results.

<PRE>
<PRE>
package seller;

import java.rmi.RemoteException;
import java.rmi.*;
import javax.ejb.*;
import java.util.*;
import java.text.NumberFormat;
import java.io.Serializable;
import javax.naming.*;
import auction.*;
import registration.*;
import java.rmi.server.UnicastRemoteObject;
import java.util.ArrayList;


public class SellerBean 
	implements SessionBean, ReturnResults {

    protected SessionContext ctx;
    javax.naming.Context ectx;
    Hashtable env = new Hashtable();
    AuctionServlet callee=null;
    Boolean ready=new Boolean("false");
    ArrayList returned;

    public int insertItem(String seller, 
	String password, 
	String description, 
	int auctiondays, 
	double startprice, 
	String summary) 
		throws RemoteException { 

      try{
        RegistrationHome regRef = (
		RegistrationHome)Naming.lookup(
		"//phoenix.eng.sun.com/registration2");
        RegistrationPK rpk= new RegistrationPK();
        rpk.setUser(seller);
        Registration newseller = (
	      Registration)regRef.findByPrimaryKey(rpk);
	if((newseller == null) || 
              (!newseller.verifyPassword(password))) {
            return(Auction.INVALID_USER);	
  	}

        AuctionItemHome home = (
		AuctionItemHome) ectx.lookup(
		                   "auctionitems");
        AuctionItem ai= home.create(seller, 
		description, 
		auctiondays, 
		startprice, 
		summary);
	if(ai == null) {
          return Auction.INVALID_ITEM;
	}else{
          return(ai.getId()); 
	}
        }catch(Exception e){ 
          System.out.println("insert problem="+e);
          return Auction.INVALID_ITEM;
        }
    }

    public void updateResults(java.util.ArrayList ar) 
		throws RemoteException {
       returned=ar; 
       synchronized(ready) {
          ready.notifyAll();
       }
    }

    public ArrayList auditAccounts() {
        this.callee=callee;
        try {
           RegistrationHome regRef = (
		RegistrationHome)Naming.lookup(
		"//phoenix.eng.sun.com/registration2");
           regRef.findLowCreditAccounts(this);
           synchronized(ready) {
              try {
                 ready.wait();
              } catch (InterruptedException e){}
           }
        return (returned);
       }catch (Exception e) {
          System.out.println("error in creditAudit "+e);
       }
      return null;
    }

    public void ejbCreate() 
		throws javax.ejb.CreateException, 
		RemoteException {
      env.put(
        javax.naming.Context.INITIAL_CONTEXT_FACTORY, 
        "weblogic.jndi.TengahInitialContextFactory");
      try{
        ectx = new InitialContext(env);
      } catch (NamingException e) {
        System.out.println(
          "problem contacting EJB server");
        throw new javax.ejb.CreateException();
      }
        Properties env=System.getProperties();
        env.put("java.rmi.server.codebase", 
	  "http://phoenix.eng.sun.com/registration");
        env.put("java.security.policy","java.policy");
        UnicastRemoteObject.exportObject(this);
    }

    public void setSessionContext(SessionContext ctx) 
		throws RemoteException {
      this.ctx = ctx;
    }

    public void unsetSessionContext() 
		throws RemoteException {   
        ctx = null;  
    } 

    public void ejbRemove() {}
    public void ejbActivate() throws RemoteException {
	System.out.println("activating seller bean");
    }
    public void ejbPassivate() throws RemoteException { 
	System.out.println("passivating seller bean");
    }
}
</PRE>

<P>
_______<BR>
<A NAME="TJVM"><SUP>1</SUP></A> As used on this web site, 
the terms &quot;Java virtual 
machine&quot; or &quot;JVM&quot; mean a virtual machine 
for the Java platform.

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