public class FRAG2 extends Protocol
Each fragment is identified by (a) the sender (part of the message to which the header is appended), (b) the fragmentation ID (which is unique per FRAG2 layer (monotonically increasing) and (c) the fragement ID which ranges from 0 to number_of_fragments-1.
Requirement: lossless delivery (e.g. NAK, ACK). No requirement on ordering. Works for both unicast and
multicast messages.
Compared to FRAG, this protocol does not need to serialize the message in order to break it into
smaller fragments: it looks only at the message's buffer, which is a byte[] array anyway. We assume that the
size addition for headers and src and dest address is minimal when the transport finally has to serialize the
message, so we add a constant (200 bytes).
down_handler, down_prot, down_queue, down_thread, down_thread_prio, log, observer, props, stack, stats, up_handler, up_prot, up_queue, up_thread, up_thread_prio
Constructor and Description |
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FRAG2() |
Modifier and Type | Method and Description |
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void |
down(Event evt)
Fragment a packet if larger than frag_size (add a header).
|
int |
getFragSize() |
java.lang.String |
getName() |
long |
getNumberOfReceivedFragments() |
long |
getNumberOfReceivedMessages() |
long |
getNumberOfSentFragments() |
long |
getNumberOfSentMessages() |
int |
getOverhead() |
void |
resetStats() |
void |
setFragSize(int s) |
void |
setOverhead(int o) |
boolean |
setProperties(java.util.Properties props)
Setup the Protocol instance acording to the configuration string
|
void |
up(Event evt)
If event is a message, if it is fragmented, re-assemble fragments into big message and pass up
the stack.
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destroy, downThreadEnabled, dumpStats, enableStats, getDownProtocol, getDownQueue, getProperties, getUpProtocol, getUpQueue, handleSpecialDownEvent, init, passDown, passUp, printStats, providedDownServices, providedUpServices, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, setDownProtocol, setObserver, setPropertiesInternal, setProtocolStack, setUpProtocol, start, startDownHandler, startUpHandler, statsEnabled, stop, stopInternal, upThreadEnabled
public int getFragSize()
public void setFragSize(int s)
public int getOverhead()
public void setOverhead(int o)
public long getNumberOfSentMessages()
public long getNumberOfSentFragments()
public long getNumberOfReceivedMessages()
public long getNumberOfReceivedFragments()
public boolean setProperties(java.util.Properties props)
setProperties
in class Protocol
public void resetStats()
resetStats
in class Protocol
public void down(Event evt)
Copyright ? 1998-2006 Bela Ban. All Rights Reserved.