Start implementing gossip initiator path

2 files changed, 220 insertions, 0 deletions

diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/GossipGirl.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/GossipGirl.java
new file mode 100644
index 0000000..01119bf
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/GossipGirl.java
@@ -0,0 +1,108 @@
+package pl.edu.mimuw.cloudatlas.agent.modules;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import pl.edu.mimuw.cloudatlas.agent.messages.AttributesMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.GetStateMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.GossipGirlMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.HejkaMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.InitiateGossipMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.NoCoTamMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.ResponseMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.StateMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.UDUPMessage;
+import pl.edu.mimuw.cloudatlas.model.Attribute;
+import pl.edu.mimuw.cloudatlas.model.AttributesMap;
+import pl.edu.mimuw.cloudatlas.model.PathName;
+import pl.edu.mimuw.cloudatlas.model.ValueQuery;
+import pl.edu.mimuw.cloudatlas.model.ValueTime;
+import pl.edu.mimuw.cloudatlas.model.ZMI;
+
+public class GossipGirl extends Module {
+    private long nextGossipId = 0;
+
+    private Map<Long, GossipGirlState> gossipStates;
+    public GossipGirl() {
+        super(ModuleType.GOSSIP);
+        gossipStates = new HashMap();
+    }
+
+    public void handleTyped(GossipGirlMessage message) throws InterruptedException, InvalidMessageType {
+        switch(message.getType()) {
+            case INITIATE:
+                initiateGossip((InitiateGossipMessage) message);
+                break;
+            case NO_CO_TAM:
+                handleNoCoTam((NoCoTamMessage) message);
+            default:
+                throw new InvalidMessageType("This type of message cannot be handled by GossipGirl");
+        }
+    }
+
+    public void handleTyped(ResponseMessage message) throws InterruptedException, InvalidMessageType {
+        switch(message.getType()) {
+            case STATE:
+                setState((StateMessage) message);
+                break;
+            default:
+                throw new InvalidMessageType("This type of message cannot be handled by GossipGirl");
+        }
+    }
+
+    private void initiateGossip(InitiateGossipMessage message) throws InterruptedException {
+        Long gossipId = nextGossipId;
+        nextGossipId++;
+        gossipStates.put(gossipId, new GossipGirlState(gossipId, message.getOurPath(), message.getTheirContact(), true));
+
+        GetStateMessage getState = new GetStateMessage("", 0, ModuleType.GOSSIP, gossipId);
+        sendMessage(getState);
+    }
+
+    private void setState(StateMessage message) throws InterruptedException {
+        GossipGirlState state = gossipStates.get(message.getRequestId());
+        if (state != null) {
+            state.setState(message.getZMI(), message.getQueries());
+            if (state.state == GossipGirlState.State.SEND_HEJKA) {
+                HejkaMessage hejka = new HejkaMessage(
+                        "",
+                        0,
+                        state.gossipId,
+                        getZoneTimestamps(message.getZMI()),
+                        getQueryTimestamps(message.getQueries())
+                );
+                UDUPMessage udupMessage = new UDUPMessage("", 0, state.theirContact, hejka);
+                sendMessage(udupMessage);
+                state.sentHejka();
+            }
+        } else {
+            System.out.println("ERROR: GossipGirl got state for a nonexistent gossip");
+        }
+    }
+
+    private void handleNoCoTam(NoCoTamMessage message) throws InterruptedException {
+        GossipGirlState state = gossipStates.get(message.getReceiverGossipId());
+        if (state != null) {
+            state.handleNoCoTam(message);
+            for (ZMI zmi : state.getZMIsToSend()) {
+                AttributesMessage attributesMessage = new AttributesMessage("", 0, zmi.getPathName(), zmi.getAttributes(), state.theirGossipId);
+                UDUPMessage udupMessage = new UDUPMessage("", 0, state.theirContact, attributesMessage);
+                sendMessage(udupMessage);
+            }
+            // TODO: send queries
+            state.sentInfo();
+        } else {
+            System.out.println("ERROR: GossipGirl got state for a nonexistent gossip");
+        }
+    }
+
+    public Map<PathName, ValueTime> getZoneTimestamps(ZMI root) {
+        return new HashMap();
+    }
+
+    public Map<Attribute, ValueTime> getQueryTimestamps(Map<Attribute, Entry<ValueQuery, ValueTime>> queries) {
+        return new HashMap();
+    }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/GossipGirlState.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/GossipGirlState.java
new file mode 100644
index 0000000..726a9b2
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/GossipGirlState.java
@@ -0,0 +1,112 @@
+package pl.edu.mimuw.cloudatlas.agent.modules;
+
+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.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 List<ZMI> getZMIsToSend() {
+        return new LinkedList();
+    }
+
+    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;
+        }
+    }
+}