/**
* Not only deserialises the object, also performs adjustments on the timestamps to bring them in
* alignment with the local time. Reads the current time on the peer node first. If the timestamp
* of any items in the cache or commands are newer throws and IOException, because that means the
* object is corrupted. Sets the timestamp of the contribution of the peer (if any) to the current
* local time.
*/
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
name = (String) in.readObject();
cache = new Hashtable();
commands = new Hashtable();
final long max = in.readLong(); // the timestamp that should be maximal
final long diff = System.currentTimeMillis() - max;
myContribution = (ContributionBox) in.readObject();
if (myContribution != null) myContribution.timeStamp = max + diff;
int cachesize = in.readInt();
for (int i = 0; i < cachesize; ++i) {
ContributionBox cb = (ContributionBox) in.readObject();
if (cb.timeStamp > max)
throw new IOException("corrupted timestamp in cache: " + cb.timeStamp + " " + max);
cb.timeStamp += diff;
cache.put(cb.contributor.name, cb);
}
int commandssize = in.readInt();
for (int i = 0; i < commandssize; ++i) {
Object comm = in.readObject();
long time = in.readLong();
if (time > max) throw new IOException("corrupted timestamp in commands: " + time + " " + max);
time += diff;
commands.put(comm, new Long(time));
}
}
/**
* 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;
}
/** Sets up parameters. */
public void setup(final EvolutionState state, final Parameter base) {
if (!(state instanceof EvolutionAgent))
state.output.fatal("DRMStatistics requires an EvolutionAgent", null, null);
EvolutionAgent agent = (EvolutionAgent) state;
super.setup(state, base);
frequency = state.parameters.getIntWithDefault(base.push(P_FREQUENCY), null, 1);
store_best = state.parameters.getBoolean(base.push(P_STORE_BEST), null, true);
// use_collective = state.parameters.getBoolean(base.push(P_COLLECTIVE),null,true);
// If we are root, set up the base filename and the logtable
if (agent.iamroot) {
// I'm not sure that outputting everything to the current directory is right
basefilename =
System.getProperty("user.dir")
+ File.separator
+ state.parameters.getFile(base.push(P_STATISTICS_FILE), null).getName();
logtable = new Hashtable();
} else defaultlog = -3; // Maybe can be useful for recognizing it as a non valid log
creationtime = System.currentTimeMillis();
}
/**
* Updates local contribution and commands. Called before information exchange attempts. Uses
* local address of contributor (if it is not null), this is replaced on the other side of the
* communication channel by the correct global address.
*/
private synchronized void updateLocalInfo() {
if (contributor != null) {
myContribution =
new ContributionBox(new Address(contributor.getName()), contributor.getContribution());
}
final Long now = new Long(System.currentTimeMillis());
if (controller != null) {
Set newcomms = controller.getCommands();
if (newcomms == null) return;
Iterator i = newcomms.iterator();
while (i.hasNext()) commands.put(i.next(), now);
}
}
/**
* Removes contributions and commands that are older than CONTRIBUTION_TIMEOUT and COMMAND_TIMEOUT
* respectively.
*/
private void removeOldStuff() {
final long current = System.currentTimeMillis();
synchronized (cache) {
Iterator i = cache.values().iterator();
while (i.hasNext()) {
ContributionBox cb = (ContributionBox) i.next();
if (current - cb.timeStamp > CONTRIBUTION_TIMEOUT) i.remove();
}
}
synchronized (commands) {
Iterator i = commands.values().iterator();
while (i.hasNext()) {
Long t = (Long) i.next();
if (current - t.longValue() > COMMAND_TIMEOUT) i.remove();
}
}
}
private void writeObject(ObjectOutputStream out) throws IOException {
synchronized (cache) {
synchronized (commands) {
out.writeObject(name);
// cache and commands are never null
out.writeLong(System.currentTimeMillis());
out.writeObject(myContribution);
out.writeInt(cache.size());
Iterator i = cache.values().iterator();
while (i.hasNext()) out.writeObject(i.next());
out.writeInt(commands.size());
i = commands.entrySet().iterator();
while (i.hasNext()) {
Map.Entry e = (Map.Entry) i.next();
long time = ((Long) e.getValue()).longValue();
out.writeObject(e.getKey());
out.writeLong(time);
}
}
}
}
/**
* 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);
}
}
}
}
}
