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Java Source Code / Java Documentation » Net » JGroups 2.4.1 sp3 » org.jgroups.protocols

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

java.lang .Thread

org.jgroups.stack .UpHandler

org.jgroups.protocols .FRAG

FRAG

public class FRAG extends Protocol (Code)

Fragmentation layer. Fragments messages larger than FRAG_SIZE into smaller packets. Reassembles fragmented packets into bigger ones. The fragmentation number is prepended to the messages as a header (and removed at the receiving side).

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 FRAG 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.
author:
   Bela Ban
author:
   Filip Hanik
version:
   $Id: FRAG.java,v 1.32.2.1 2007/04/27 08:03:51 belaban Exp $

Inner Class :static class FragmentationList

Inner Class :static class FragmentationTable

Field Summary
long	num_received_frags
long	num_received_msgs
long	num_sent_frags
long	num_sent_msgs

Method Summary
public void	down(Event evt) Fragment a packet if larger than frag_size (add a header).
public int	getFragSize()
public String	getName()
public long	getNumberOfReceivedFragments()
public long	getNumberOfReceivedMessages()
public long	getNumberOfSentFragments()
public long	getNumberOfSentMessages()
void	handleConfigEvent(HashMap map)
public void	resetStats()
public void	setFragSize(int s)
public boolean	setProperties(Properties props)
public void	up(Event evt) If event is a message, if it is fragmented, re-assemble fragments into big message and pass up the stack.

Field Detail

num_received_frags
long num_received_frags(Code)

num_received_msgs
long num_received_msgs(Code)

num_sent_frags
long num_sent_frags(Code)

num_sent_msgs
long num_sent_msgs(Code)

Method Detail

down
public void down(Event evt)(Code)
	Fragment a packet if larger than frag_size (add a header). Otherwise just pass down. Only add a header if framentation is needed !

getFragSize
public int getFragSize()(Code)

getName
public String getName()(Code)

getNumberOfReceivedFragments
public long getNumberOfReceivedFragments()(Code)

getNumberOfReceivedMessages
public long getNumberOfReceivedMessages()(Code)

getNumberOfSentFragments
public long getNumberOfSentFragments()(Code)

getNumberOfSentMessages
public long getNumberOfSentMessages()(Code)

handleConfigEvent
void handleConfigEvent(HashMap map)(Code)

resetStats
public void resetStats()(Code)

setFragSize
public void setFragSize(int s)(Code)

setProperties
public boolean setProperties(Properties props)(Code)
	Setup the Protocol instance acording to the configuration string

up
public void up(Event evt)(Code)
	If event is a message, if it is fragmented, re-assemble fragments into big message and pass up the stack.

Fields inherited from org.jgroups.stack.UpHandler

final protected Log log(Code)(Java Doc)

Methods inherited from org.jgroups.stack.UpHandler

public void run()(Code)(Java Doc)
public void setObserver(ProtocolObserver observer)(Code)(Java Doc)

Fields inherited from java.lang.Thread

final public static int MAX_PRIORITY(Code)(Java Doc)
final public static int MIN_PRIORITY(Code)(Java Doc)
final public static int NORM_PRIORITY(Code)(Java Doc)

Methods inherited from java.lang.Thread

public static int activeCount()(Code)(Java Doc)
final public void checkAccess()(Code)(Java Doc)
native public int countStackFrames()(Code)(Java Doc)
native public static Thread currentThread()(Code)(Java Doc)
public void destroy()(Code)(Java Doc)
public static void dumpStack()(Code)(Java Doc)
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public ClassLoader getContextClassLoader()(Code)(Java Doc)
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public long getId()(Code)(Java Doc)
final public String getName()(Code)(Java Doc)
final public int getPriority()(Code)(Java Doc)
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final public void join() throws InterruptedException(Code)(Java Doc)
final public void resume()(Code)(Java Doc)
public void run()(Code)(Java Doc)
public void setContextClassLoader(ClassLoader cl)(Code)(Java Doc)
final public void setDaemon(boolean on)(Code)(Java Doc)
public static void setDefaultUncaughtExceptionHandler(UncaughtExceptionHandler eh)(Code)(Java Doc)
final public void setName(String name)(Code)(Java Doc)
final public void setPriority(int newPriority)(Code)(Java Doc)
public void setUncaughtExceptionHandler(UncaughtExceptionHandler eh)(Code)(Java Doc)
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final public void stop()(Code)(Java Doc)
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final public void suspend()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
native public static void yield()(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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