josx.rcxcomm
Class F7DeliveryHandler

java.lang.Object
  josx.rcxcomm.PacketHandler
      josx.rcxcomm.F7DeliveryHandler

public class F7DeliveryHandler

extends PacketHandler

A packet handler that attempts (but doesn't fully succeed in) reliable delivery for F7 Lego firmware opcode packets. It implements acks, and checks packet validity, but has no sequence number checking. Packets are not guaranteed to get through, and duplicates can occur undetected. See F7Handler for more information.

Field Summary

Fields inherited from class josx.rcxcomm.PacketHandler

lowerHandler

Constructor Summary

F7DeliveryHandler(PacketHandler handler)

Method Summary

boolean	isPacketAvailable() Check if a packet is available
int	receivePacket(byte[] buffer) Receive a packet, and send an ack.
boolean	sendPacket(byte[] packet, int len) Send a packet, checking for returned ack.

Methods inherited from class josx.rcxcomm.PacketHandler

close, getError, isAckAvailable, open, receiveAck, reset, setListen

Methods inherited from class java.lang.Object

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

Constructor Detail

F7DeliveryHandler

public F7DeliveryHandler(PacketHandler handler)

Method Detail

sendPacket

public boolean sendPacket(byte[] packet,
                          int len)

Send a packet, checking for returned ack.

Specified by:

sendPacket in class PacketHandler

Parameters:

packet - the bytes to send

len - the number of bytes to send

Returns:

true if the send was successful, else false

receivePacket

public int receivePacket(byte[] buffer)

Receive a packet, and send an ack.

Specified by:

receivePacket in class PacketHandler

Parameters:

buffer - the buffer to receive the packet into

Returns:

the number of bytes received

isPacketAvailable

public boolean isPacketAvailable()

Check if a packet is available

Specified by:

isPacketAvailable in class PacketHandler

Returns:

true if a Packet is available, else false