/**
* Pops a header from a message. Creates a new Header from the values contained by the message.
*
* @param message message that contains the info to build the header
* @return a header builted from the values of contained by the message
*/
public static SEQHeader pop(Message message) {
SEQHeader header = new SEQHeader();
header.order = message.popLong();
header.sn = message.popLong();
header.id = message.popInt();
return header;
}
/**
* Deliver a DATA event received from the network.
*
* @param event the event received from the network.
*/
private void reliableDATADeliver(GroupSendableEvent event) {
Message msg = event.getMessage();
long[] uniformInfo = new long[vs.view.length];
for (int i = uniformInfo.length; i > 0; i--) uniformInfo[i - 1] = msg.popLong();
mergeUniformInfo(uniformInfo);
DATAHeader header = DATAHeader.pop(event.getMessage());
log.debug(
"Received DATA message: "
+ header.id
+ ":"
+ header.sn
+ " timestpamp is "
+ timeProvider.currentTimeMillis());
header.setTime(delay[header.id] + timeProvider.currentTimeMillis());
ListContainer container = new ListContainer(event, header);
// add the event to the RECEIVED list...
R.addLast(container);
// ... and set a timer to be delivered later, according to the delay that came with the message
setTimer(container, delay[header.id], vs.id);
// Deliver event to the upper layer (spontaneous order)
try {
event.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
}
/**
* Pops a header from a message. Creates a new Header from the values contained by the message.
*
* @param message message that contains the info to build the header
* @return a header builted from the values of contained by the message
*/
public static DATAHeader pop(Message message) {
DATAHeader header = new DATAHeader(-1, -1);
header.delay = message.popLong();
header.sn = message.popLong();
header.id = message.popInt();
return header;
}
private void handleGroupSendableEvent(GroupSendableEvent event) {
if (debugOn && log.isDebugEnabled()) log.debug("CAUSAL Processing event " + event);
if (!(event instanceof Send)) {
if (event.getDir() == Direction.DOWN) {
Message omsg = event.getMessage();
for (int i = 0; i < VC.length; i++) omsg.pushLong(VC[i]);
try {
event.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
VC[ls.my_rank]++;
} else {
if (event.orig != ls.my_rank) {
long[] VCm = new long[VC.length];
extractVCm(event.getMessage(), VCm);
pending.add(new EventContainer(event, VCm));
deliverPending();
} else {
clearVC(event.getMessage());
try {
event.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
}
}
} else
try {
event.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
}
private void handleUniformInfo(UniformInfoEvent event) {
log.debug(
"Received UniformInfo from " + event.orig + ". Uniformity information table now is: ");
Message msg = event.getMessage();
long[] uniformInfo = new long[vs.view.length];
for (int i = uniformInfo.length; i > 0; i--) uniformInfo[i - 1] = msg.popLong();
mergeUniformInfo(uniformInfo);
if (log.isDebugEnabled())
for (int i = 0; i < lastOrderList.length; i++)
log.debug("RANK :" + i + " | LAST_ORDER: " + lastOrderList[i]);
deliverUniform();
}
/**
* Multicast a SEQUENCER message to the group.
*
* @param container the container of the message to be sequenced.
*/
private void reliableSEQMulticast(ListContainer container) {
SEQHeader header = new SEQHeader(container.header.sender(), container.header.sn(), globalSN);
SeqOrderEvent event;
try {
event =
new SeqOrderEvent(container.event.getChannel(), Direction.DOWN, this, vs.group, vs.id);
SEQHeader.push(header, event.getMessage());
Message msg = event.getMessage();
for (int i = 0; i < lastOrderList.length; i++) msg.pushLong(lastOrderList[i]);
log.debug("Sending SEQ message. Rank=" + ls.my_rank + " Header: " + header);
event.go();
} catch (AppiaEventException e2) {
e2.printStackTrace();
}
}
/**
* Handles all events related to messenger features: TextEvent, DrawEvent, ImageEvent,
* ClearWhiteBoardEvent, MouseButtonEvent
*
* <p>If an event direction is DOWN an hash is generated otherwise received and calculated hashes
* are compared. <br>
* Different hashes mean that an event is ignored
*
* @param ev
*/
private void handleInterestingEvent(GroupSendableEvent ev) {
Message message = ev.getMessage();
byte[] data;
Hash h = new Hash();
// String type;
if (ev.getDir() == Direction.DOWN) {
data = message.toByteArray();
md.update(data);
md.update(secret);
byte[] my = md.digest();
h.setHash(my);
message.pushObject(h);
md.reset();
// out.println("MD calculated");
ev.setObjectsMessage(message);
try {
ev.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
} else {
// incoming hash
h = (Hash) message.popObject();
data = message.toByteArray();
// calculates hash
md.update(data);
md.update(secret);
if (MessageDigest.isEqual(md.digest(), h.getHash())) {
// out.println("Valid");
try {
ev.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
}
// else{
// out.println("Error! Compromised message received!");
// out.println("Message ignored!");
// }
md.reset();
}
}
private void sendUniformInfo(Channel channel) {
if (!isBlocked) {
UniformInfoEvent event = new UniformInfoEvent();
Message msg = event.getMessage();
for (int i = 0; i < lastOrderList.length; i++) msg.pushLong(lastOrderList[i]);
event.setChannel(channel);
event.setDir(Direction.DOWN);
event.setSource(this);
try {
event.init();
event.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
}
}
/**
* Multicast a DATA event to the group.
*
* @param event the event to be multicast.
* @param msgDelay the message delay associated with the event.
*/
private void reliableDATAMulticast(GroupSendableEvent event, long msgDelay) {
DATAHeader header = new DATAHeader(ls.my_rank, sendingLocalSN++, msgDelay);
DATAHeader.push(header, event.getMessage());
Message msg = event.getMessage();
for (int i = 0; i < lastOrderList.length; i++) msg.pushLong(lastOrderList[i]);
log.debug(
"Sending DATA message from appl. Rank="
+ ls.my_rank
+ " SN="
+ sendingLocalSN
+ " Delay="
+ msgDelay);
try {
event.go();
} catch (AppiaEventException e) {
e.printStackTrace();
}
timeLastMsgSent = timeProvider.currentTimeMillis();
}
private void handleSendEvent(SendEvent conf) {
Message message = conf.getMessage();
int id = message.popInt();
System.out.println("[Message received: " + message.peekString() + "]");
message.pushInt(id);
DeliverEvent event = new DeliverEvent();
event.setMessage(message);
event.setDestProcess(processes.getOther());
event.setSourceProcess(processes.getSelf());
event.setChannel(conf.getChannel());
event.setDir(Direction.DOWN);
event.setSourceSession(this);
try {
event.init();
event.go();
} catch (AppiaEventException ex) {
ex.printStackTrace();
}
}
/** Deliver a SEQUENCER message received from the network. */
private void reliableSEQDeliver(SeqOrderEvent event) {
Message msg = event.getMessage();
long[] uniformInfo = new long[vs.view.length];
for (int i = uniformInfo.length; i > 0; i--) uniformInfo[i - 1] = msg.popLong();
mergeUniformInfo(uniformInfo);
SEQHeader header = SEQHeader.pop(event.getMessage());
log.debug(
"["
+ ls.my_rank
+ "] Received SEQ message "
+ header.id
+ ":"
+ header.sn
+ " timestamp is "
+ timeProvider.currentTimeMillis());
lastOrderList[ls.my_rank] = header.order;
newUniformInfo = true;
// add it to the sequencer list
S.add(new ListSEQContainer(header, timeProvider.currentTimeMillis()));
log.debug("Received SEQ from " + event.orig + " at time " + timeProvider.currentTimeMillis());
// and tries to deliver messages that already have the order
deliverRegular();
deliverUniform();
}
public void peekMySelf(Message m) {
number = m.peekInt();
message = (RainMessage) m.peekObject();
}
public void popMySelf(Message m) {
number = m.popInt();
message = (RainMessage) m.popObject();
}
public void pushMySelf(Message m) {
m.pushObject(message);
m.pushInt(number);
}
/**
* Extracts the VC from the header of a message.
*
* @param omsg the message from where the VC will be extracted.
* @param VCm array where the values of the VC for the given message will be stored.
*/
private void extractVCm(Message omsg, long[] VCm) {
for (int i = VCm.length - 1; i >= 0; i--) VCm[i] = omsg.popLong();
}
/**
* Push all parameters of a Header into a Appia Message.
*
* @param header header to push into the message
* @param message message to put the header
*/
public static void push(SEQHeader header, Message message) {
message.pushInt(header.id);
message.pushLong(header.sn);
message.pushLong(header.order);
}
/**
* Clears the values of the VC in the header of a message.
*
* @param omsg the message whose header will be cleared.
*/
private void clearVC(Message omsg) {
for (int i = 0; i < VC.length; i++) omsg.popLong();
}
/**
* Push all parameters of a Header into a Appia Message.
*
* @param header header to push into the message
* @param message message to put the header
*/
public static void push(DATAHeader header, Message message) {
message.pushInt(header.id);
message.pushLong(header.sn);
message.pushLong(header.delay);
}