musicviewbd.java

使用WebLogic Platform构建音乐站点

package music.web; 

import java.io.FileNotFoundException;
import java.rmi.RemoteException;
import java.util.*;
import javax.ejb.*;
import javax.naming.*;

import music.ejb.*;
import music.shared.*;

/**
 * MusicViewEjb 业务代表类
 */
public class MusicViewBD {

    private static final String JNDI_MUSIC_VIEW = "ejb/MusicView";
    private static MusicViewRemoteHome home = null;
    private static Object syn = new Object();

    private static MusicViewRemoteHome getHome() {
        if(home==null) {
            synchronized(syn) {
                if(home==null) {
                    Hashtable ht = new Hashtable();
                    ht.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
                    ht.put(Context.PROVIDER_URL, "t3://localhost:7001");
                    Context ctx = null;
                    try {
                        ctx = new InitialContext(ht);
                        Object obj = ctx.lookup(JNDI_MUSIC_VIEW);
                        home = (MusicViewRemoteHome)javax.rmi.PortableRemoteObject.narrow(obj, MusicViewRemoteHome.class);
                    }
                    catch(NamingException ne) {
                        // Error log:
                        System.out.println("-- Exception in lookup ejb: ejb/AccountManage --");
                        ne.printStackTrace();
                    }
                    finally {
                        try { ctx.close(); } catch(Exception e) {}
                    }
                }
            }
        }
        return home;
    }

    public static String download(int id)
        throws ApplicationException, IllegalArgumentException, FileNotFoundException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.download(id);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e){}
        }
    }

    public static AlbumVO getAlbum(int id)
        throws ApplicationException, IllegalArgumentException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.getAlbum(id);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e){}
        }
    }

    public static Collection getAlbums(int id)
        throws ApplicationException, IllegalArgumentException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.getAlbums(id);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e){}
        }
    }

    public static ArtistVO getArtist(int id)
        throws ApplicationException, IllegalArgumentException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.getArtist(id);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e){}
        }
    }

    public static Collection getArtists(int id)
        throws ApplicationException, IllegalArgumentException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.getArtists(id);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e){}
        }
    }

    public static Collection getCategories(int id)
        throws ApplicationException, IllegalArgumentException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.getCategories(id);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e){}
        }
    }

    public static String getLyric(int id)
        throws ApplicationException, IllegalArgumentException, LyricNotFoundException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.getLyric(id);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e){}
        }
    }

    public static Collection getSongs(int id)
        throws ApplicationException, IllegalArgumentException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.getSongs(id);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e){}
        }
    }

    public static int rate(int songId, int mark)
        throws ApplicationException, IllegalArgumentException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.rate(songId, mark);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e){}
        }
    }

    public static Collection searchSongs(String title)
        throws ApplicationException, IllegalArgumentException
    {
        MusicViewRemote view = null;
        try {
            view = getHome().create();
            return view.searchSongs(title);
        }
        catch(RemoteException re) {
            throw new ApplicationException(re);
        }
        catch(CreateException re) {
            throw new ApplicationException(re);
        }
        finally {
            try { view.remove(); } catch(Exception e) {}
        }
    }
}