routing
Class FirstContactRouter

java.lang.Object
  routing.MessageRouter
      routing.ActiveRouter
          routing.FirstContactRouter

public class FirstContactRouter
extends ActiveRouter

First contact router which uses only a single copy of the message (or fragments) and forwards it to the first available contact.

Field Summary

Fields inherited from class routing.ActiveRouter

DELETE_DELIVERED_S, deleteDelivered, RESPONSE_PREFIX, sendingConnections, TTL_CHECK_INTERVAL

Fields inherited from class routing.MessageRouter

B_SIZE_S, DENIED_NO_SPACE, DENIED_OLD, DENIED_TTL, DENIED_UNSPECIFIED, MSG_TTL_S, msgTtl, Q_MODE_FIFO, Q_MODE_RANDOM, RCV_OK, SEND_QUEUE_MODE_S, TRY_LATER_BUSY

Constructor Summary

protected	FirstContactRouter(FirstContactRouter r) Copy constructor.
	FirstContactRouter(Settings s) Constructor.

Method Summary

protected int	checkReceiving(Message m) Checks if router "wants" to start receiving message (i.e.
FirstContactRouter	replicate() Creates a replicate of this router.
protected void	transferDone(Connection con) Method is called just before a transfer is finalized at ActiveRouter.update().
void	update() Checks out all sending connections to finalize the ready ones and abort those whose connection went down.

Methods inherited from class routing.ActiveRouter

addToSendingConnections, canStartTransfer, changedConnection, createNewMessage, dropExpiredMessages, exchangeDeliverableMessages, getConnections, getMessagesForConnected, getOldestMessage, init, isSending, isTransferring, makeRoomForMessage, makeRoomForNewMessage, messageTransferred, receiveMessage, requestDeliverableMessages, shuffleMessages, startTransfer, transferAborted, tryAllMessages, tryAllMessagesToAllConnections, tryMessagesForConnected, tryMessagesToConnections

Methods inherited from class routing.MessageRouter

addApplication, addToMessages, compareByQueueMode, deleteMessage, getApplications, getBufferSize, getFreeBufferSize, getHost, getMessage, getMessageCollection, getNrofMessages, getRoutingInfo, hasMessage, isDeliveredMessage, isIncomingMessage, messageAborted, putToIncomingBuffer, removeFromIncomingBuffer, removeFromMessages, sendMessage, sortByQueueMode, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

FirstContactRouter

public FirstContactRouter(Settings s)

Constructor. Creates a new message router based on the settings in the given Settings object.

Parameters:

s - The settings object

FirstContactRouter

protected FirstContactRouter(FirstContactRouter r)

Copy constructor.

Parameters:

r - The router prototype where setting values are copied from

Method Detail

checkReceiving

protected int checkReceiving(Message m)

Description copied from class: ActiveRouter

Checks if router "wants" to start receiving message (i.e. router isn't transferring, doesn't have the message and has room for it).

Overrides:

checkReceiving in class ActiveRouter

Parameters:

m - The message to check

Returns:

A return code similar to MessageRouter.receiveMessage(Message, DTNHost), i.e. MessageRouter.RCV_OK if receiving seems to be OK, TRY_LATER_BUSY if router is transferring, DENIED_OLD if the router is already carrying the message or it has been delivered to this router (as final recipient), or DENIED_NO_SPACE if the message does not fit into buffer

update

public void update()

Description copied from class: ActiveRouter

Checks out all sending connections to finalize the ready ones and abort those whose connection went down. Also drops messages whose TTL <= 0 (checking every one simulated minute).

Overrides:

update in class ActiveRouter

See Also:

ActiveRouter.addToSendingConnections(Connection)

transferDone

protected void transferDone(Connection con)

Description copied from class: ActiveRouter

Method is called just before a transfer is finalized at ActiveRouter.update(). Subclasses that are interested of the event may want to override this.

Overrides:

transferDone in class ActiveRouter

Parameters:

con - The connection whose transfer was finalized

replicate

public FirstContactRouter replicate()

Description copied from class: MessageRouter

Creates a replicate of this router. The replicate has the same settings as this router but empty buffers and routing tables.

Specified by:

replicate in class MessageRouter

Returns:

The replicate