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Class semper.download.DcfClientProtocol 

java.lang.Object
   |
   +----semper.download.DcfClientProtocol
public class DcfClientProtocol
extends Object
implements ProtocolConstants, Runnable
The DcfClientProtocol module implements the client part of the client-server download protocol

Version:
$Revision: 1.3 $ $Date: 1998/05/28 15:09:45 $
Author:
Petros Pantis, Kostas Tzelepis

Variable Index

o CLOSED_CONNECTION
State during shutdown connection to the server host
o END_CONNECTION
State after closing the connection to the server host
o ERROR
Defines the error state identifier
o SEND_ERROR
State in which a error will be send to the server host
o WAIT_FOR_ACK
State in which the current thread suspends his execution and waits for the resume signal from the ClientRequest module.
o WAIT_FOR_DCF_LIST
State in which the current thread suspends his execution and waits for the resume signal and the list of certificate blocks that are stale or unknown.
o WAIT_FOR_FILE_LIST
State in which the current thread suspends his execution and waits for the resume signal and the list of all the new/updated files
o WAIT_TO_DIE
State in which the current thread suspends his execution and waits for the resume signal.

Constructor Index

o DcfClientProtocol(String, Object, int, ProgressBar)
DcfClientProtocol object constructor

Method Index

o getCommObject()
Called from the ClientRequest module each time the DcfClientProtocol thread is suspeneded.
o getError()
Method used to caught the error message
o getIn()
Method used to obtain the input stream of the connection
o getOut()
Method used to obtain the output stream of the connection
o getState()
Retieve the executional state of the DcfClientProtocol thread
o Notify(int, Object)
Wakes up the suspended DcfClientProtocol thread
o run()
DcfClientProtocol's main method, which implements the client part of the download protocol
o start()
Strarts the DcfClientProtocol thread

Variables

o ERROR 
 public static final int ERROR
Defines the error state identifier

o CLOSED_CONNECTION 
 public static int CLOSED_CONNECTION
State during shutdown connection to the server host

o END_CONNECTION 
 public static final int END_CONNECTION
State after closing the connection to the server host

o SEND_ERROR 
 public static final int SEND_ERROR
State in which a error will be send to the server host

o WAIT_FOR_ACK 
 public static final int WAIT_FOR_ACK
State in which the current thread suspends his execution and waits for the resume signal from the ClientRequest module. The next state after resuming, is ether the SEND_ERROR state if something goes wrong with the downloaded files or the UPDATE_DCF is sended to the connected host

o WAIT_FOR_DCF_LIST 
 public static final int WAIT_FOR_DCF_LIST
State in which the current thread suspends his execution and waits for the resume signal and the list of certificate blocks that are stale or unknown.

o WAIT_FOR_FILE_LIST 
 public static final int WAIT_FOR_FILE_LIST
State in which the current thread suspends his execution and waits for the resume signal and the list of all the new/updated files

o WAIT_TO_DIE 
 public static final int WAIT_TO_DIE
State in which the current thread suspends his execution and waits for the resume signal. After this signal has been caught, the thread exits

Constructors

o DcfClientProtocol 
 public DcfClientProtocol(String myid,
                          Object host,
                          int port,
                          ProgressBar bar)
DcfClientProtocol object constructor

Parameters:
myid - client's unique identifier
host - the remote server
port - server's download port number

Methods

o start 
 public void start()
Strarts the DcfClientProtocol thread

o getIn 
 public ObjectInputStream getIn()
Method used to obtain the input stream of the connection

Returns:
value the input stream of the connection
o getOut 
 public ObjectOutputStream getOut()
Method used to obtain the output stream of the connection

Returns:
value the output stream of the connection
o Notify 
 public synchronized void Notify(int status,
                                 Object notifyobj)
Wakes up the suspended DcfClientProtocol thread

Parameters:
status - defines the next execution state of the DcfClientProtocol thread
notifyobj - a object that contains data usefull for the next state
o getCommObject 
 public Object getCommObject()
Called from the ClientRequest module each time the DcfClientProtocol thread is suspeneded.

Returns:
value the request data structure made by the suspended DcfClientProtocol thread
o getState 
 public int getState()
Retieve the executional state of the DcfClientProtocol thread

Returns:
value the current executional state
o getError 
 public String getError()
Method used to caught the error message

Returns:
value the error string object
o run 
 public void run()
DcfClientProtocol's main method, which implements the client part of the download protocol 

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