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package pl.edu.mimuw.cloudatlas.agent.modules;
import java.util.AbstractMap.SimpleImmutableEntry;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import pl.edu.mimuw.cloudatlas.agent.messages.NoCoTamMessage;
import pl.edu.mimuw.cloudatlas.model.Attribute;
import pl.edu.mimuw.cloudatlas.model.PathName;
import pl.edu.mimuw.cloudatlas.model.ValueContact;
import pl.edu.mimuw.cloudatlas.model.ValueQuery;
import pl.edu.mimuw.cloudatlas.model.ValueTime;
import pl.edu.mimuw.cloudatlas.model.ValueUtils;
import pl.edu.mimuw.cloudatlas.model.ZMI;
public class GossipGirlState {
public enum State {
WAIT_FOR_STATE_INITIALIZER,
WAIT_FOR_STATE_RESPONDER,
SEND_HEJKA,
SEND_INFO,
WAIT_FOR_NO_CO_TAM,
WAIT_FOR_FIRST_INFO,
WAIT_FOR_INFO,
ERROR
}
public PathName ourPath;
public ValueContact theirContact;
public long gossipId;
public long theirGossipId;
public long timeOffest;
public State state;
public ZMI hierarchy;
public Map<Attribute, Entry<ValueQuery, ValueTime>> queries;
public ValueTime hejkaSendTimestamp;
public ValueTime hejkaReceiveTimestamp;
public ValueTime noCoTamSendTimestamp;
public ValueTime noCoTamSendReceiveTimestamp;
private Map<PathName, ValueTime> theirZoneTimestamps;
private Map<Attribute, ValueTime> theirQueryTimestamps;
public GossipGirlState(long gossipId, PathName ourPath, ValueContact theirContact, boolean initiating) {
this.gossipId = gossipId;
this.ourPath = ourPath;
this.theirContact = theirContact;
if (initiating) {
state = State.WAIT_FOR_STATE_INITIALIZER;
} else {
state = State.WAIT_FOR_STATE_RESPONDER;
}
}
public void setState(ZMI hierarchy, Map<Attribute, Entry<ValueQuery, ValueTime>> queries) {
switch (state) {
case WAIT_FOR_STATE_INITIALIZER:
this.hierarchy = hierarchy;
this.queries = queries;
state = State.SEND_HEJKA;
break;
case WAIT_FOR_STATE_RESPONDER:
this.hierarchy = hierarchy;
this.queries = queries;
state = State.WAIT_FOR_FIRST_INFO;
break;
default:
System.out.println("ERROR: tried to set gossip state when not expected");
state = State.ERROR;
}
}
public void sentHejka() {
switch (state) {
case SEND_HEJKA:
state = state.WAIT_FOR_NO_CO_TAM;
break;
default:
System.out.println("ERROR: tried to set gossip state when not expected");
state = State.ERROR;
}
}
public void handleNoCoTam(NoCoTamMessage message) {
switch (state) {
case WAIT_FOR_NO_CO_TAM:
theirGossipId = message.getSenderGossipId();
theirZoneTimestamps = message.getZoneTimestamps();
theirQueryTimestamps = message.getQueryTimestamps();
hejkaSendTimestamp = message.getHejkaSendTimestamp();
hejkaReceiveTimestamp = message.getHejkaReceiveTimestamp();
state = State.SEND_INFO;
break;
default:
System.out.println("ERROR: tried to set gossip state when not expected");
state = State.ERROR;
}
}
public Map<PathName, ValueTime> getZoneTimestampsToSend() {
Map<PathName, ValueTime> timestamps = new HashMap();
collectZoneTimestamps(timestamps, hierarchy, theirContact.getName());
return timestamps;
}
public Map<Attribute, ValueTime> getQueryTimestampsToSend() {
Map<Attribute, ValueTime> queryTimestamps= new HashMap();
for (Entry<Attribute, Entry<ValueQuery, ValueTime>> query : queries.entrySet()) {
queryTimestamps.put(query.getKey(), query.getValue().getValue());
}
return queryTimestamps;
}
public List<ZMI> getZMIsToSend() {
List<ZMI> zmis = new LinkedList();
for (Entry<PathName, ValueTime> timestampedPath : getZoneTimestampsToSend().entrySet()) {
ValueTime theirTimestamp = theirZoneTimestamps.get(timestampedPath.getKey());
if (theirTimestamp == null || ValueUtils.valueLower(theirTimestamp, timestampedPath.getValue())) {
System.out.println("going to send " + timestampedPath.getKey().toString());
try {
zmis.add(hierarchy.findDescendant(timestampedPath.getKey()));
} catch (ZMI.NoSuchZoneException e) {
System.out.println("ERROR: didn't find a zone we wanted to send in getZMIsToSend");
}
}
}
return zmis;
}
public List<Entry<Attribute, ValueQuery>> getQueriesToSend() {
List<Entry<Attribute, ValueQuery>> queryList = new LinkedList();
for (Entry<Attribute, ValueTime> timestampedQuery : getQueryTimestampsToSend().entrySet()) {
ValueTime theirTimestamp = theirQueryTimestamps.get(timestampedQuery.getKey());
if (theirTimestamp == null || ValueUtils.valueLower(theirTimestamp, timestampedQuery.getValue())) {
queryList.add(
new SimpleImmutableEntry(
timestampedQuery.getKey(),
queries.get(timestampedQuery.getKey()).getKey()
)
);
}
}
return queryList;
}
public void collectZoneTimestamps(Map<PathName, ValueTime> timestamps, ZMI currentZMI, PathName recipientPath) {
for (ZMI zmi : currentZMI.getSons()) {
if (interestedIn(recipientPath, zmi.getPathName())) {
ValueTime timestamp = (ValueTime) zmi.getAttributes().getOrNull("timestamp");
if (timestamp != null) {
timestamps.put(zmi.getPathName(), timestamp);
} else {
System.out.println("ERROR: collectZoneTimestamps encountered a zone with no timestamp");
}
} else {
collectZoneTimestamps(timestamps, zmi, recipientPath);
}
}
}
public boolean interestedIn(PathName recipientPath, PathName zmiPath) {
return isPrefix(zmiPath.levelUp(), recipientPath) && !isPrefix(zmiPath, recipientPath);
}
public boolean isPrefix(PathName prefix, PathName path) {
List<String> prefixComponents = prefix.getComponents();
List<String> pathComponents = path.getComponents();
if (prefixComponents.size() > pathComponents.size()) {
return false;
}
Iterator<String> prefixIterator = prefixComponents.iterator();
Iterator<String> pathIterator = pathComponents.iterator();
while (prefixIterator.hasNext()) {
if (!prefixIterator.next().equals(pathIterator.next())) {
return false;
}
}
return true;
}
public void sentInfo() {
switch (state) {
case SEND_INFO:
state = State.WAIT_FOR_INFO;
break;
default:
System.out.println("ERROR: tried to set gossip state when not expected");
state = State.ERROR;
}
}
}
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