/**
* This method is the main function of the thread of the collective. It does housekeeping and
* regularly talks to peers to exchange information. It can be stopped by calling <code>close()
* </code>.
*
* @see #close()
*/
public final void run() {
while (shouldLive) {
// try{
System.gc();
removeOldStuff();
if (!refresh()) {
Address[] a = observer.getPeerAddresses();
if (a != null)
synchronized (cache) {
for (int i = 0; i < a.length; ++i)
cache.put(a[i].name, new ContributionBox(a[i], null));
}
}
for (int i = 0; i < REFRESHRATE; i += 1000) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
shouldLive = false;
}
if (shouldLive == false) break;
Thread.yield();
}
/*}
catch( RuntimeException e )
{
Logger.error( "Collective#run()",
"Runtime exception caught, something is going wrong",e);
}*/
}
cache = null;
observer = null;
}
/**
* This one checks that the stats message was received. If not, the message is sent again up to
* five times. Run time an best individual of run are logged.
*/
public void finalStatistics(final EvolutionState state, final int result) {
super.finalStatistics(state, result);
EvolutionAgent agent = (EvolutionAgent) state;
StatisticsData data =
new StatisticsData(
new Address(agent.getName()),
state.generation,
System.currentTimeMillis() - creationtime,
getBestIndividual(state),
getBestIndividual(state));
if (agent.iamroot) // Local logging
printStatistics(state, data); // Every statistic will go there
else { // DRM logging
for (int i = 0; i < 5; i++) { // Try to send final data 5 times
IRequest request = agent.fireMessage(agent.getRootAddress(), EvolutionAgent.M_STATS, data);
while (request.getStatus() == IRequest.WAITING) {
Thread.yield();
// try{Thread.sleep(1000);}
// catch(Exception e){state.output.error("Exception: " + e);}
}
if (request.getStatus() == IRequest.DONE) {
break;
} else {
state.output.error("There was an error sending final statistics.");
try {
Thread.sleep(1000 * i ^ 2);
} catch (Exception e) {
state.output.error("Exception: " + e);
}
}
}
}
}
/**
* Initiates an information exchange with a known and living other base if such a base exists.
*
* @return true if refresh was succesful, false otherwise.
*/
private boolean refresh() {
final String logSender = observer + "#refresh";
final String contrName = ((contributor != null) ? contributor.getName() : null);
// --- refreshing local contribution and commands
updateLocalInfo();
// --- creating a random permutation of peers
Vector peers = null;
synchronized (cache) {
peers = new Vector(cache.values());
// just to be sure, shouldn't be there anyway
if (contrName != null) peers.remove(cache.get(contrName));
}
Collections.shuffle(peers);
if (peers.isEmpty()) {
Logger.debug(logSender, "no peers in cache");
return false;
}
// --- reset array representations
cacheCollection = null;
commandCollection = null;
// --- trying to talk to random peer
IRequest answer = null;
Address peer = null;
for (int i = 0; i < peers.size(); ++i) {
if (!shouldLive) return false;
peer = ((ContributionBox) peers.get(i)).contributor;
Logger.debug(logSender, "asking " + peer);
answer = observer.fireMessage(peer, "collectiveUpdate-" + name, this);
while (answer.getStatus() == IRequest.WAITING) {
try {
Thread.sleep(100);
} catch (Exception e) {
}
}
if (answer.getStatus() == IRequest.DONE) break;
Logger.debug(logSender, "not accessable: " + peer);
}
if (answer.getStatus() != IRequest.DONE) {
Logger.debug(logSender, "no accessable peers");
observer.collectiveUpdated(null);
return false;
} else {
Collective c = (Collective) answer.getInfo("reply");
// --- remove possible garbage
if (contributor != null) {
cache.remove(contributor.getName());
c.cache.remove(contributor.getName());
}
cache.remove(peer.name);
c.cache.remove(peer.name);
repairSenderAddress(c, peer);
merge(c);
observer.collectiveUpdated((ContributionBox) cache.get(c.myContribution.contributor.name));
return true;
}
}
