vbsClient

Class UpgradeClient

java.lang.Object

vbsClient.UpgradeClient

public class UpgradeClient
extends java.lang.Object

The class UpgradeClient is responsible for receiving upgrade of the VBS client from the server. If upgrade is detected, it is stored in the local directory. The upgrade is applied during the next application startup by YAJSW - the wrapper which allows to run the VBS client as a Windows service or as a Linux daemon.

Author:

Tomasz Bujlow (tbu@es.aau.dk)

Field Summary

Fields

Modifier and Type	Field and Description
private static int	DEFAULT_BUFFERSIZE Size of the buffer used to read data from sockets.
private java.net.InetAddress	ip IP address of the VBS server.
private static org.apache.log4j.Logger	log Used to log different events.
private java.net.Socket	mySocket The socket used for communication with the VBS server.
private int	port Number of the TCP port on the VBS server on which it listens for upgrade requests.

Constructor Summary

Constructors

Constructor and Description
UpgradeClient(java.lang.String ip, int port) Constructs the class.

Method Summary

Methods

Modifier and Type	Method and Description
private int	receiveClientVersionOnServer() Receives version of the VBS client which is available on the server.
private boolean	receiveUpgradeFromTheServer() Receives the upgrade file from the VBS server.
void	upgrade() Initiates the process of downloading the upgrade.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_BUFFERSIZE

private static final int DEFAULT_BUFFERSIZE

Size of the buffer used to read data from sockets.

See Also:

Constant Field Values

log

private static org.apache.log4j.Logger log

Used to log different events.

mySocket

private java.net.Socket mySocket

The socket used for communication with the VBS server.

port

private int port

Number of the TCP port on the VBS server on which it listens for upgrade requests.

ip

private java.net.InetAddress ip

IP address of the VBS server.

Constructor Detail

UpgradeClient

public UpgradeClient(java.lang.String ip,
             int port)
              throws java.io.IOException

Constructs the class.

Parameters:

ip - IP address of the VBS server

port - number of the TCP port on the VBS server on which it listens for upgrade requests

Throws:

java.io.IOException - if the IP address of the server is invalid

Method Detail

upgrade

public void upgrade()

Initiates the process of downloading the upgrade.

receiveClientVersionOnServer

private int receiveClientVersionOnServer()
                                  throws java.lang.Exception

Receives version of the VBS client which is available on the server. If the version is higher than the currently used, the upgrade will be performed.

Returns:

version of the VBS client which is available on the server

Throws:

java.lang.Exception - when there is a problem with communication with the VBS server

receiveUpgradeFromTheServer

private boolean receiveUpgradeFromTheServer()
                                     throws java.lang.Exception

Receives the upgrade file from the VBS server.

Returns:

true if the file was successfully received, false otherwise

Throws:

java.lang.Exception - when there is a problem with communication with the VBS server