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package pl.edu.mimuw.cloudatlas.agent;
import pl.edu.mimuw.cloudatlas.agent.messages.*;
import pl.edu.mimuw.cloudatlas.agent.modules.GossipGirlStrategies;
import pl.edu.mimuw.cloudatlas.agent.modules.TimerScheduledTask;
import pl.edu.mimuw.cloudatlas.model.*;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.function.Supplier;
public class HierarchyConfig {
private GossipGirlStrategies gossipGirlStrategies;
private GossipGirlStrategies.ZoneSelectionStrategy zoneSelectionStrategy;
private Random random = new Random();
private PathName ourPath;
private EventBus eventBus;
HierarchyConfig(EventBus eventBus, String zonePath, String zoneStrategy) {
zoneSelectionStrategy = parseStrategy(zoneStrategy);
ourPath = new PathName(zonePath);
gossipGirlStrategies = new GossipGirlStrategies(ourPath);
this.eventBus = eventBus;
}
private GossipGirlStrategies.ZoneSelectionStrategy parseStrategy(String selectionStrategy) {
switch (selectionStrategy) {
case "RoundRobinExp":
return GossipGirlStrategies.ZoneSelectionStrategy.ROUND_ROBIN_EXP_FREQ;
case "RoundRobinUniform":
return GossipGirlStrategies.ZoneSelectionStrategy.ROUND_ROBIN_SAME_FREQ;
case "RandomExp":
return GossipGirlStrategies.ZoneSelectionStrategy.RANDOM_DECR_EXP;
case "RandomUniform":
return GossipGirlStrategies.ZoneSelectionStrategy.RANDOM_UNFIORM;
default:
throw new UnsupportedOperationException("Selection strategy doesnt exist");
}
}
public void startGossip(long gossipPeriod, String zonePath) {
Supplier<TimerScheduledTask> taskSupplier = () ->
new TimerScheduledTask() {
public void run() {
try {
System.out.println("INFO: initiating gossip");
StateMessage state = getState();
PathName gossipLevel = gossipGirlStrategies.selectStrategy(zoneSelectionStrategy);
ValueContact contact;
if (random.nextDouble() < 0.2) {
System.out.println("FORCING FALLBACK");
contact = selectFallbackContact(state.getContacts());
} else {
System.out.println("LOOKING FOR CONTACT");
contact = selectContactFromLevel(gossipLevel, state);
}
if (contact != null) {
System.out.println("INFO: found a contact " + contact.toString());
InitiateGossipMessage message = new InitiateGossipMessage("", 0, new PathName(zonePath), contact);
sendMessage(message);
} else {
System.out.println("DEBUG: couldn't find contact for gossip");
}
} catch (InterruptedException e) {
System.out.println("Interrupted while initiating gossip");
} catch (Exception e) {
System.out.println("ERROR: something happened " + e.toString());
e.printStackTrace();
}
}
};
AgentUtils.startRecursiveTask(taskSupplier, gossipPeriod, eventBus);
}
private ValueContact selectContactFromLevel(PathName path, StateMessage state) throws Exception {
ZMI root = state.getZMI();
List<ZMI> siblings = getSiblings(root, path);
filterEmptyContacts(siblings);
System.out.println("filtered siblings: " + siblings.toString());
if (siblings.isEmpty()) {
System.out.println("SIBLINGS IS EMPTY!!!");
return selectFallbackContact(state.getContacts());
}
ZMI zmi = selectZMI(siblings);
System.out.println("SELECTED: " + zmi.toString());
ValueSet contactsValue = (ValueSet) zmi.getAttributes().getOrNull("contacts");
System.out.println("ITS CONTACTS: " + contactsValue.toString());
Set<Value> valueSetOrig = contactsValue.getValue();
System.out.println("valueSetOrig: " + valueSetOrig.toString());
Set<Value> valueSet = new HashSet(valueSetOrig);
System.out.println("valueSet: " + valueSet.toString());
filterOurContact(valueSet);
System.out.println("FILTERED VALUE SET: " + valueSet.toString());
return selectContactFromSet(valueSet);
}
private void filterOurContact(Set<Value> contacts) {
Iterator it = contacts.iterator();
while (it.hasNext()) {
Value value = (Value) it.next();
if (value.getType().getPrimaryType() == Type.PrimaryType.CONTACT) {
ValueContact contact = (ValueContact) value;
if (contact.getName().equals(ourPath)) {
it.remove();
}
} else {
System.out.println("WARN: non contact value passed to filterOurContact");
}
}
}
private StateMessage getState() throws Exception {
CompletableFuture<ResponseMessage> responseFuture = new CompletableFuture();
this.eventBus.addMessage(new RequestStateMessage("", 0, responseFuture));
return (StateMessage) responseFuture.get();
}
private ValueContact selectFallbackContact(Set<ValueContact> contacts) throws Exception {
if (contacts.isEmpty()) {
return null;
} else {
return selectContactFromSet(contacts);
}
}
private ZMI selectZMI(List<ZMI> zmis) throws Exception {
int i = random.nextInt(zmis.size());
for (ZMI zmi : zmis) {
if (i == 0) {
return zmi;
}
i--;
}
System.out.println("ERROR: empty list passed to selectZMI");
throw new Exception("empty list passed to selectZMI");
}
private <T> ValueContact selectContactFromSet(Set<T> contacts) throws Exception {
if (contacts.size() == 0) {
System.out.println("GOT EMPTY SET FOR SELECTION");
return null;
}
int i = random.nextInt(contacts.size());
System.out.println("ROLLED RANDOM: " + Integer.toString(i));
for (T contact : contacts) {
if (i == 0) {
return (ValueContact) contact;
}
i--;
}
System.out.println("ERROR: empty list passed to selectContactFromSet");
throw new Exception("empty list passed to selectContactFromSet");
}
private List<ZMI> getSiblings(ZMI root, PathName path) {
try {
System.out.println("DEBUG: path in getSiblings: " + path.toString());
List<ZMI> siblingsImm = root.findDescendant(path).getFather().getSons();
System.out.println("DEBUG: siblingsImm: " + siblingsImm.toString());
List<ZMI> siblings = new ArrayList();
for (ZMI siblingOrI : siblingsImm) {
siblings.add(siblingOrI);
}
System.out.println("found siblings: " + siblings.toString());
return siblings;
} catch (ZMI.NoSuchZoneException e) {
System.out.println("ERROR: didn't find path when looking for siblings");
return new ArrayList();
}
}
private void filterEmptyContacts(List<ZMI> zmis) {
Iterator<ZMI> iterator = zmis.iterator();
while (iterator.hasNext()) {
ZMI zmi = iterator.next();
ValueSet contacts = (ValueSet) zmi.getAttributes().getOrNull("contacts");
System.out.println("checking zmi " + zmi.toString());
System.out.println("its contacts: " + contacts.toString());
if (contacts == null || contacts.isNull() || contacts.isEmpty() || onlyContactIsUs(contacts)) {
System.out.println("Let's remove it!");
iterator.remove();
} else {
System.out.println("Let's keep it!");
}
}
}
private boolean onlyContactIsUs(ValueSet contacts) {
for (Value value : contacts) {
if (value.getType().getPrimaryType() == Type.PrimaryType.CONTACT) {
ValueContact contact = (ValueContact) value;
if (!contact.getName().equals(ourPath)) {
return false;
}
} else {
System.out.println("WARN: non contact value passed to onlyContactIsUs");
}
}
return true;
}
public void startQueries(long queriesPeriod) {
Supplier<TimerScheduledTask> taskSupplier = () ->
new TimerScheduledTask() {
public void run() {
try {
sendMessage(new RunQueriesMessage("", 0));
} catch (InterruptedException e) {
System.out.println("Interrupted while triggering queries");
}
}
};
AgentUtils.startRecursiveTask(taskSupplier, queriesPeriod, eventBus);
}
public void startCleaningGossips(long gossipCleanPeriod) {
Supplier<TimerScheduledTask> taskSupplier = () ->
new TimerScheduledTask() {
public void run() {
try {
System.out.println("INFO: Scheduling old gossip cleanup");
sendMessage(new CleanOldGossipsMessage("", 0, ValueUtils.addToTime(ValueUtils.currentTime(), -gossipCleanPeriod)));
} catch (InterruptedException e) {
System.out.println("Interrupted while triggering queries");
}
}
};
AgentUtils.startRecursiveTask(taskSupplier, gossipCleanPeriod, eventBus);
}
}
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