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# Class w3c.www.sap.SapManager

    java.lang.Object
       |
       +----java.lang.Thread
               |
               +----w3c.www.sap.SapManager

public class SapManager
extends Thread
implements EventHandler

The SAP engine will both announce sessions, and handle declared sessions.

##

announces
  List of announcements to make, keyed by session identifier.
DEFAULT_ADDRESS
  SAP default multicast socket address.
DEFAULT_PORT
  SAP default port number.
DELETE_ANNOUNCE_COUNTER
  Number of deletion announcement to be sent by default.
DELETE_INTERVAL
  Interval between deleion announcement:
eventManager
  The event manager for handling announcements.
handler
  The announce handler.
MIN_INTERVAL
  Minimum announcement interval, in milliseconds.
port
  Our port number.
SAP_VERSION
  SAP version handled by this implementation.
socket
  The SAP multicast socket.

##

announce(Announce)
  Make a session announcement.
createSession(String, long, long, String, String, InetAddress, String)
  Create a blank session, to be filled out by the caller.
decode(byte[], int, int)
  Decode a SAP packet.
delete(SapSession)
  Delete, and announce deletion of a session.
enumerateSessions()
  Enumerate all registered sessions.
getManager()
  Get the default SAP manager for this application.
getManager(InetAddress, int)
  Get a SAP manager for the given address/port pair.
handleTimerEvent(Object, long)
  EventHandler implementation - An annouce is to be made right now.
main(String[])
run()
startAnnounce(SapSession, long)
  Add the given session to the list of sessions to be announced.
stopAnnounce(SapSession)
  Stop announcing the given session.
testingSession(SapManager)

##

DEFAULT_ADDRESS

     public static InetAddress DEFAULT_ADDRESS

  SAP default multicast socket address.

DEFAULT_PORT

     public static final int DEFAULT_PORT

  SAP default port number.

SAP_VERSION

     public static final int SAP_VERSION

  SAP version handled by this implementation.

DELETE_INTERVAL

     public static final long DELETE_INTERVAL

  Interval between deleion announcement:

DELETE_ANNOUNCE_COUNTER

     public static final int DELETE_ANNOUNCE_COUNTER

  Number of deletion announcement to be sent by default.

MIN_INTERVAL

     public static final long MIN_INTERVAL

  Minimum announcement interval, in milliseconds.

socket

     protected MulticastSocket socket

  The SAP multicast socket.

port

     protected int port

  Our port number.

announces

     protected Hashtable announces

  List of announcements to make, keyed by session identifier.

eventManager

     protected EventManager eventManager

  The event manager for handling announcements.

handler

     protected SapHandler handler

  The announce handler.

##

decode

     protected SapSession decode(byte buf[],
                                 int off,
                                 int len)

  Decode a SAP packet.

  Parameters:
    buf - The buffer containing the packet.
    off - Offset of packet within above buffer.
    len - Length of packet.
  Returns:
    A SapSession instance, or null if this was a Session Description Deletion.

getManager

     public static synchronized SapManager getManager() throws IOException

  Get the default SAP manager for this application.

  Returns:
    A SapManager instance.
  Throws: IOException
    If the manager couldn't create the multicast socket to join the SAP channel.

getManager

     public static synchronized SapManager getManager(InetAddress a,
                                                      int p) throws IOException

  Get a SAP manager for the given address/port pair. The same manager will be returned for the same pairs.

  Parameters:
    A - The SAP Inet address.
    p - The SAP port.
  Returns:
    A SapManager instance.
  Throws: IOException
    If the manager couldn't create the multicast socket to join the SAP channel.

createSession

     public SapSession createSession(String username,
                                     long sid,
                                     long sversion,
                                     String snettype,
                                     String saddrtype,
                                     InetAddress saddr,
                                     String name)

  Create a blank session, to be filled out by the caller.

  Parameters:
    username - Owner of the session.
    sid - Session identifier.
    sversion - Version of that session.
    snettype - Session network type.
    saddrtype - Session address type.
    saddr - Session address.
    name - Session name.

handleTimerEvent

     public void handleTimerEvent(Object data,
                                  long time)

  EventHandler implementation - An annouce is to be made right now.

  Parameters:
    data - The handler closure (a Announce instance).
    time - Current time.

startAnnounce

     public void startAnnounce(SapSession s,
                               long interval)

  Add the given session to the list of sessions to be announced.

  Parameters:
    s - The session to be announced.
    interval - The interval between two announcements in milliseconds.

delete

     public void delete(SapSession s)

  Delete, and announce deletion of a session.

  Parameters:
    s - The session description to announce deletion of.

stopAnnounce

     public void stopAnnounce(SapSession s)

  Stop announcing the given session.

  Parameters:
    s - The session whose periodic announce is to stop.

enumerateSessions

     public Enumeration enumerateSessions()

  Enumerate all registered sessions.

  Returns:
    A Enumeration of SapSession instances.

announce

     protected void announce(Announce a) throws IOException, UnknownHostException

  Make a session announcement.

  Parameters:
    a - The announcement to be made.

run

     public void run()

  Overrides:
    run in class Thread

testingSession

     public static SapSession testingSession(SapManager engine) throws UnknownHostException

main

     public static void main(String args[])

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