rtspstoredsessionenginebean.java

Sun公司Dream项目

/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
 * You can obtain a copy of the license at
 * http://www.opensource.org/licenses/cddl1.php
 * See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * HEADER in each file and include the License file at
 * http://www.opensource.org/licenses/cddl1.php.  If 
 * applicable, add the following below this CDDL HEADER, 
 * with the fields enclosed by brackets "[]" replaced 
 * with your own identifying information: 
 * Portions Copyright [yyyy]
 * [name of copyright owner]
 */ 

/*
 * $(@)RTSPStoredSessionEngineBean.java $Revision: 1.1.1.1 $ $Date: 2006/03/15 13:12:10 $
 * 
 * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
 */
 
package com.sun.sjc.idtv.vod.server.rtspsession;

import com.sun.sjc.idtv.vod.shared.data.*;

import java.sql.*;
import javax.ejb.*;
import java.rmi.*;
import javax.sql.*;
import javax.naming.*;
import java.util.*;

/**
 * Implementation bean for the <code>RTSPStoredSessionEngine</code> interface,
 * <code>RTSPStoredSessionEngine</code> defines all possible business methods for
 * the bean.
 *
 * @see RTSPStoredSessionEngine
 * @see RTSPStoredSessionEngineHome
 */

/* table information:
 SQL> describe rtspsessions
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 USERID                                             NUMBER(38)
 MOVIEID                                            VARCHAR2(255)
 TIMEST                                             TIMESTAMP(6)
 SMPTE                                              VARCHAR2(43)
*/


             
public class RTSPStoredSessionEngineBean implements SessionBean {
    
    private SessionContext sessionContext = null;
    private DataSource dataSource;

    /**
     * Sets the session context.  Required by EJB spec.
     * @param sessionContext - a SessionContext object 
     */

    public void setSessionContext(SessionContext sessionContext) {
        this.sessionContext = sessionContext;
        try {
            InitialContext ic = new InitialContext();
            dataSource = (DataSource) ic.lookup("jdbc/sample");
        } catch (Exception ex) {
            throw new EJBException("Unable to connect to database: "+ex.getMessage());
        }
    }

    /**
     * Creates a bean.  Required by EJB spec.
     * @exception CreateException 
     */

    public void ejbCreate() throws java.rmi.RemoteException,
    javax.ejb.CreateException {    
    }

    /**
     * Removes the bean.  Required by EJB spec. 
     */

    public void ejbRemove() {    
    }

    /**
     * Loads the state of the bean from secondary storage.  Required by EJB spec. 
     */

    public void ejbActivate() {    
    }

    /**
     * Serializes the state of the bean to secondary storage.  Required by EJB
     * spec. 
     */

    public void ejbPassivate() {
    }

    /**
     * Required by EJB spec. 
     */

    public void RTSPStoredSessionEngine() {
    }

    /**
     * Stores an RTSP session object into the database
     * @param rtspSessionObject - information on the RTSP session
     * @return void
     * @exception RemoteException
     * @exception SQLException
     */

    public void storeRTSPSession(RTSPSessionObject rtspSessionObject)
    throws RemoteException, java.sql.SQLException {
        try {
            // create database connection and prepare statements
            Connection conn = dataSource.getConnection(); 
            PreparedStatement stmt = null;
            // find existing sessions
            stmt = conn.prepareStatement("select userId from rtspsessions where userId = ? and movieId = ?");
            stmt.setQueryTimeout(30);
            stmt.setLong(1,Long.parseLong(rtspSessionObject.getUserId()));
            stmt.setString(2,rtspSessionObject.getMovieId());
            ResultSet rs = stmt.executeQuery();
            if (rs.next()) {
                // if found, then update the existing session with the current
                // rtspsession values
                stmt = conn.prepareStatement("update rtspsessions set smpte = ?, timest = ? where userId = ? and movieId = ?");
                stmt.setString(1,rtspSessionObject.getSmpte());
                stmt.setTimestamp(2,rtspSessionObject.getTimestamp());
                stmt.setLong(3,Long.parseLong(rtspSessionObject.getUserId()));
                stmt.setString(4,rtspSessionObject.getMovieId());
            } else {
                // if not found, then insert a new rtspsession
                stmt = conn.prepareStatement("insert into rtspsessions values(?,?,?,?)");
                stmt.setLong(1,Long.parseLong(rtspSessionObject.getUserId()));
                stmt.setString(2,rtspSessionObject.getMovieId());
                stmt.setTimestamp(3,rtspSessionObject.getTimestamp());
                stmt.setString(4,rtspSessionObject.getSmpte());
            }
            stmt.executeUpdate();
            rs.close();
            stmt.close();
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Gets all of the stored RTSP sessions from the database for a given user
     * @param userId - id of user
     * @return rtspSessionObjects - array of RTSPSessionObjects containing all
     * of the RTSP sessions of a specified user
     * @exception RemoteException
     * @exception SQLException 
     */

    public RTSPSessionObject[] getStoredRTSPSessions(String userId) throws RemoteException,
    java.sql.SQLException {
        Vector vector = null;
        RTSPSessionObject[] rtspSessionObjects = null;
        Connection conn = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;
        try {
            // create database connection and prepare statement
            conn = dataSource.getConnection();
            stmt = conn.prepareStatement("select movieId,timest,smpte from rtspsessions where userId = ?");
            stmt.setQueryTimeout(30);
            stmt.setLong(1,Long.parseLong(userId));
            rs = stmt.executeQuery();
            
            vector = new Vector();
            // store all of the RTSPSessionObjects in a vector
            while(rs.next()) {
                vector.add(new RTSPSessionObject(userId, rs.getString(1), rs.getTimestamp(2), rs.getString(3)));
            }

            // move all of the RTSPSessionObjects into an array from the vector
            rtspSessionObjects = new RTSPSessionObject[vector.size()];
            for(int i=0;i<vector.size(); i++) {
                rtspSessionObjects[i] = (RTSPSessionObject)vector.elementAt(i);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            rs.close();
            stmt.close();
            conn.close();
            return rtspSessionObjects;
        }
    }
}