diff options
Diffstat (limited to 'src/main/java/pl/edu/mimuw')
| -rw-r--r-- | src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java | 129 |
1 files changed, 122 insertions, 7 deletions
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java index 62cd544..b478f1f 100644 --- a/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java +++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java @@ -7,24 +7,34 @@ import java.net.UnknownHostException; import java.rmi.registry.LocateRegistry; import java.rmi.registry.Registry; import java.rmi.server.UnicastRemoteObject; +import java.util.List; import java.util.ArrayList; import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; import java.util.Map; +import java.util.Random; +import java.util.Set; +import java.util.concurrent.CompletableFuture; import java.util.function.Supplier; import pl.edu.mimuw.cloudatlas.agent.NewApiImplementation; -import pl.edu.mimuw.cloudatlas.agent.messages.RunQueriesMessage; -import pl.edu.mimuw.cloudatlas.agent.messages.TimerSchedulerMessage; -import pl.edu.mimuw.cloudatlas.agent.messages.UpdateAttributesMessage; +import pl.edu.mimuw.cloudatlas.agent.messages.*; import pl.edu.mimuw.cloudatlas.agent.modules.*; import pl.edu.mimuw.cloudatlas.agent.modules.Module; import pl.edu.mimuw.cloudatlas.api.Api; import pl.edu.mimuw.cloudatlas.interpreter.Main; import pl.edu.mimuw.cloudatlas.model.PathName; +import pl.edu.mimuw.cloudatlas.model.Value; +import pl.edu.mimuw.cloudatlas.model.ValueContact; +import pl.edu.mimuw.cloudatlas.model.ValueSet; import pl.edu.mimuw.cloudatlas.model.ZMI; public class Agent { private static EventBus eventBus; + private static GossipGirlStrategies.ZoneSelectionStrategy zoneSelectionStrategy; + private static GossipGirlStrategies gossipGirlStrategies; + private static Random random = new Random(); public static void runRegistry() { try { @@ -47,13 +57,13 @@ public class Agent { Long freshnessPeriod = Long.getLong("freshness_period"); modules.put(ModuleType.STATE, new Stanik(freshnessPeriod)); modules.put(ModuleType.QUERY, new Qurnik()); + modules.put(ModuleType.GOSSIP, new GossipGirl()); Integer port = Integer.getInteger("UDUPServer.port"); Integer timeout = Integer.getInteger("UDUPServer.timeout"); Integer bufsize = Integer.getInteger("UDUPServer.bufsize"); UDUPServer server = new UDUPServer(InetAddress.getByName("127.0.0.1"), port, bufsize); modules.put(ModuleType.UDP, new UDUP(port, timeout, bufsize, server)); - // TODO add modules as we implement them return modules; } @@ -133,10 +143,110 @@ public class Agent { } }; - TimerScheduledTask timerTask = new RecursiveScheduledTask(queriesPeriod, taskSupplier); + startRecursiveTask(taskSupplier, queriesPeriod); + } + + private static void startGossip(long gossipPeriod) { + Supplier<TimerScheduledTask> taskSupplier = () -> + new TimerScheduledTask() { + public void run() { + try { + System.out.println("INFO: initiating gossip"); + PathName gossipLevel = gossipGirlStrategies.selectStrategy(zoneSelectionStrategy); + ValueContact contact = selectContactFromLevel(gossipLevel); + if (contact != null) { + InitiateGossipMessage message = new InitiateGossipMessage("", 0, new PathName("/uw/violet07"), 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()); + } + } + }; + + startRecursiveTask(taskSupplier, gossipPeriod); + } + + private static ValueContact selectContactFromLevel(PathName path) throws Exception { + CompletableFuture<ResponseMessage> responseFuture = new CompletableFuture(); + eventBus.addMessage(new RequestStateMessage("", 0, responseFuture)); + StateMessage response = (StateMessage) responseFuture.get(); + ZMI root = response.getZMI(); + List<ZMI> siblings = getSiblings(root, path); + filterEmptyContacts(siblings); + if (siblings.isEmpty()) { + return selectFallbackContact(); + } + ZMI zmi = selectZMI(siblings); + ValueSet contactsValue = (ValueSet) zmi.getAttributes().getOrNull("contacts"); + Set<Value> valueSet = contactsValue.getValue(); + return selectContactFromSet(valueSet); + } + + private static ValueContact selectFallbackContact() throws Exception { + return selectContactFromSet(new HashSet()); + } + + private static 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 static ValueContact selectContactFromSet(Set<Value> contacts) throws Exception { + int i = random.nextInt(contacts.size()); + for (Value 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 static List<ZMI> getSiblings(ZMI root, PathName path) { + try { + List<ZMI> siblingsAndI = root.findDescendant(path).getFather().getSons(); + List<ZMI> siblings = new ArrayList(); + for (ZMI siblingOrI : siblingsAndI) { + if (!siblingOrI.getPathName().equals(path)) { + siblings.add(siblingOrI); + } + } + return siblings; + } catch (ZMI.NoSuchZoneException e) { + System.out.println("ERROR: didn't find path when looking for siblings"); + return new ArrayList(); + } + } + + private static void filterEmptyContacts(List<ZMI> zmis) { + Iterator<ZMI> iterator = zmis.iterator(); + while (iterator.hasNext()) { + ZMI zmi = iterator.next(); + ValueSet contacts = (ValueSet) zmi.getAttributes().getOrNull("contacts"); + if (contacts == null || contacts.isNull() || contacts.isEmpty()) { + iterator.remove(); + } + } + } + + private static void startRecursiveTask(Supplier<TimerScheduledTask> taskSupplier, long period) { + TimerScheduledTask timerTask = new RecursiveScheduledTask(period, taskSupplier); try { - eventBus.addMessage(new TimerSchedulerMessage("", 0, "", queriesPeriod, 0, timerTask)); + eventBus.addMessage(new TimerSchedulerMessage("", 0, "", period, 0, timerTask)); } catch (InterruptedException e) { System.out.println("Interrupted while starting queries"); } @@ -155,10 +265,15 @@ public class Agent { } public static void main(String[] args) { + zoneSelectionStrategy = GossipGirlStrategies.ZoneSelectionStrategy.ROUND_ROBIN_SAME_FREQ; + gossipGirlStrategies = new GossipGirlStrategies(new PathName("/uw/violet07")); runModulesAsThreads(); runRegistry(); initZones(); // TODO: make query period confiurable with config file and from tests - startQueries(100l); + Long queryPeriod = Long.getLong("query_period"); + startQueries(queryPeriod); + Long gossipPeriod = Long.getLong("gossip_period"); + startGossip(gossipPeriod); } } |