Building Java Enterprise Applications Volume I: Architecture phần 10 ppt

Building Java™ Enterprise Applications Volume I: Architecture

239

public AccountTypeLocal findByPrimaryKey(Integer accountTypeID)

throws FinderException, EJBException;

public AccountTypeLocal findByType(String type)

throws FinderException, EJBException;

}

Example E-12 is the implementation class for the AccountType bean.

Example E-12. The AccountTypeBean Implementation Class

package com.forethought.ejb.accountType;

import javax.ejb.CreateException;

import javax.naming.Context;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import com.forethought.ejb.sequence.SequenceException;

import com.forethought.ejb.sequence.SequenceLocal;

import com.forethought.ejb.sequence.SequenceLocalHome;

import com.forethought.ejb.util.EntityAdapter;

public abstract class AccountTypeBean extends EntityAdapter {

public Integer ejbCreate(String type) throws CreateException {

// Get the next primary key value

try {

Context context = new InitialContext( );

// Note that RMI-IIOP narrowing is not required

SequenceLocalHome home = (SequenceLocalHome)

context.lookup("java:comp/env/ejb/SequenceLocalHome");

SequenceLocal sequence = home.create( );

String accountTypeKey =

(String)context.lookup(

"java:comp/env/constants/AccountTypeKey");

Integer id = sequence.getNextValue(accountTypeKey);

// Set values

setId(id);

setType(type);

return null;

} catch (NamingException e) {

throw new CreateException("Could not obtain an " +

"InitialContext.");

} catch (SequenceException e) {

throw new CreateException("Error getting primary key value: " +

e.getMessage( ));

}

}

public void ejbPostCreate(String type) {

// Empty implementation

}

public abstract void setId(Integer id);

public abstract Integer getId( );

Building Java™ Enterprise Applications Volume I: Architecture

240

public abstract String getType( );

public abstract void setType(String type);

}

E.1.4 The Fund Bean

Example E-13 is the remote interface for the Fund entity bean.

Example E-13. The Fund Remote Interface

package com.forethought.ejb.fund;

import java.rmi.RemoteException;

import javax.ejb.EJBObject;

public interface Fund extends EJBObject {

public FundInfo getInfo( ) throws RemoteException;

public void setInfo(FundInfo fundInfo) throws RemoteException;

public Integer getId( ) throws RemoteException;

public String getName( ) throws RemoteException;

public void setName(String name) throws RemoteException;

public String getDescription( ) throws RemoteException;

public void setDescription(String description)

throws RemoteException;

}

Example E-14 is the local interface for the Fund bean, and is used in container-managed

relationships.

Example E-14. The Fund Local Interface

package com.forethought.ejb.fund;

import javax.ejb.EJBException;

import javax.ejb.EJBLocalObject;

public interface FundLocal extends EJBLocalObject {

public Integer getId( ) throws EJBException;

public String getName( ) throws EJBException;

public void setName(String name) throws EJBException;

public String getDescription( ) throws EJBException;

public void setDescription(String description)

throws EJBException;

}

Example E-15 shows the information class (FundInfo) for the Fund entity bean.

Building Java™ Enterprise Applications Volume I: Architecture

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Example E-15. The FundInfo Class

package com.forethought.ejb.fund;

import java.io.Serializable;

public class FundInfo implements Serializable {

private int id;

private String name;

private String description;

protected FundInfo(int id, String name, String description) {

this.id = id;

this.name = name;

this.description = description;

}

public int getId( ) {

return id;

}

public String getName( ) {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getDescription( ) {

return description;

}

public void setDescription(String description) {

this.description = description;

}

}

The home interface for the Fund entity bean is shown in Example E-16.

Example E-16. The FundHome Interface

package com.forethought.ejb.fund;

import java.rmi.RemoteException;

import javax.ejb.CreateException;

import javax.ejb.EJBHome;

import javax.ejb.FinderException;

public interface FundHome extends EJBHome {

public Fund create(String name, String description)

throws CreateException, RemoteException;

public Fund findByPrimaryKey(Integer fundID)

throws FinderException, RemoteException;