diff --git a/src/main/java/net/floodlightcontroller/mastership/IMastershipService.java b/src/main/java/net/floodlightcontroller/mastership/IMastershipService.java
index b3ddda5..83800c3 100644
--- a/src/main/java/net/floodlightcontroller/mastership/IMastershipService.java
+++ b/src/main/java/net/floodlightcontroller/mastership/IMastershipService.java
@@ -11,7 +11,7 @@
 	}
 	
 	// Acquire mastership for a switch. 
-	public void acquireMastership(long dpid, MastershipCallback cb);
+	public void acquireMastership(long dpid, MastershipCallback cb) throws Exception;
 	
 	// Release mastership for a switch
 	public void releaseMastership(long dpid);
diff --git a/src/main/java/net/floodlightcontroller/mastership/MastershipManager.java b/src/main/java/net/floodlightcontroller/mastership/MastershipManager.java
index 6c3c178..46b533e 100644
--- a/src/main/java/net/floodlightcontroller/mastership/MastershipManager.java
+++ b/src/main/java/net/floodlightcontroller/mastership/MastershipManager.java
@@ -13,6 +13,7 @@
 import net.floodlightcontroller.core.module.IFloodlightService;
 
 import org.apache.zookeeper.WatchedEvent;
+import org.apache.zookeeper.Watcher.Event.KeeperState;
 import org.openflow.util.HexString;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -23,14 +24,12 @@
 import com.netflix.curator.framework.api.CuratorWatcher;
 import com.netflix.curator.framework.recipes.leader.LeaderLatch;
 import com.netflix.curator.framework.recipes.leader.Participant;
-import com.netflix.curator.framework.state.ConnectionState;
-import com.netflix.curator.framework.state.ConnectionStateListener;
 import com.netflix.curator.retry.ExponentialBackoffRetry;
 
-public class MastershipManager implements IFloodlightModule, IMastershipService,
-											ConnectionStateListener {
+public class MastershipManager implements IFloodlightModule, IMastershipService {
+
 	protected static Logger log = LoggerFactory.getLogger(MastershipManager.class);
-	protected String mastershipId;
+	protected String mastershipId = null;
 	
 	//TODO read this from configuration
 	protected String connectionString = "localhost:2181";
@@ -42,12 +41,9 @@
 	protected Map<String, LeaderLatch> switchLatches;
 	protected Map<String, MastershipCallback> switchCallbacks;
 	
-	//protected final String singleLatchPath = switchLatchesPath + "/00:00:00:00:00:00:00:01";
-	//protected LeaderLatch singleLatch;
-
-	
 	protected class ParamaterizedCuratorWatcher implements CuratorWatcher {
 		private String dpid;
+		private boolean isLeader = false;
 		private String latchPath;
 		
 		public ParamaterizedCuratorWatcher(String dpid, String latchPath){
@@ -61,37 +57,63 @@
 
 			LeaderLatch latch = switchLatches.get(dpid);
 			
-			Participant leader = latch.getLeader();
+			if (event.getState() == KeeperState.Disconnected){
+				if (isLeader) {
+					log.debug("Disconnected while leader - lost leadership for {}", dpid);
+					
+					isLeader = false;
+					switchCallbacks.get(dpid).changeCallback(HexString.toLong(dpid), false);
+				}
+				return;
+			}
 			
-			log.debug("Leader for {} changed. Now {}", dpid, leader.getId());
-			
-			if (leader.getId().equals(mastershipId)){
-				switchCallbacks.get(dpid).changeCallback(HexString.toLong(dpid), true);
+			try {
+				Participant leader = latch.getLeader();
+
+				if (leader.getId().equals(mastershipId) && !isLeader){
+					log.debug("Became leader for {}", dpid);
+					
+					isLeader = true;
+					switchCallbacks.get(dpid).changeCallback(HexString.toLong(dpid), true);
+				}
+				else if (!leader.getId().equals(mastershipId) && isLeader){
+					log.debug("Lost leadership for {}", dpid);
+					
+					isLeader = false;
+					switchCallbacks.get(dpid).changeCallback(HexString.toLong(dpid), false);
+				}
+			} catch (Exception e){
+				if (isLeader){
+					log.debug("Exception checking leadership status. Assume leadship lost for {}",
+							dpid);
+					
+					isLeader = false;
+					switchCallbacks.get(dpid).changeCallback(HexString.toLong(dpid), false);
+				}
 			}
 			
 			client.getChildren().usingWatcher(this).inBackground().forPath(latchPath);
 			//client.getChildren().usingWatcher(this).forPath(latchPath);
 		}
-	};
+	}
 	
 	@Override
-	public void acquireMastership(long dpid, MastershipCallback cb) {
-		//TODO check if there's already a latch in the list
-		//TODO throw exception if unique ID not set
-		//TODO use unique ID
-		if (cb == null) {
-			//TODO throw exception?
+	public void acquireMastership(long dpid, MastershipCallback cb) throws Exception {
+		
+		if (mastershipId == null){
+			throw new RuntimeException("Must set mastershipId before calling aquireMastership");
 		}
 		
 		String dpidStr = HexString.toHexString(dpid);
 		String latchPath = switchLatchesPath + "/" + dpidStr;
 		
+		if (switchLatches.get(dpidStr) != null){
+			throw new RuntimeException("Leader election for switch " + dpidStr +
+					"is already running");
+		}
+		
 		LeaderLatch latch = new LeaderLatch(client, latchPath, mastershipId);
 		switchLatches.put(dpidStr, latch);
-		//if (switchCallbacks.put(dpidStr, cb) != cb){
-			//NOTE instance equality intended
-		//	log.debug("Throwing out old callback for switch {}: {}", dpidStr, cb);
-		//}
 		switchCallbacks.put(dpidStr, cb);
 		
 		try {
@@ -101,17 +123,19 @@
 					.inBackground().forPath(latchPath);
 			latch.start();
 		} catch (Exception e) {
-			log.debug("WATCHER ERROROROROR");
-			e.printStackTrace();
+			log.warn("Error starting leader latch: {}", e.getMessage());
+			throw e;
 		}
 		
 	}
 
 	@Override
 	public void releaseMastership(long dpid) {
-		// TODO Auto-generated method stub
-		LeaderLatch latch = switchLatches.get(HexString.toHexString(dpid));
+		String dpidStr = HexString.toHexString(dpid);
+		
+		LeaderLatch latch = switchLatches.get(dpidStr);
 		if (latch == null) {
+			log.debug("Trying to release mastership for switch we are not contesting");
 			return;
 		}
 		
@@ -120,6 +144,9 @@
 		} catch (IOException e) {
 			
 		}
+		
+		switchLatches.remove(dpidStr);
+		switchCallbacks.remove(dpidStr);
 	}
 
 	@Override
@@ -131,7 +158,6 @@
 			return false;
 		}
 		
-		//return latch.hasLeadership();
 		try {
 			return latch.getLeader().getId().equals(mastershipId);
 		} catch (Exception e) {
@@ -142,39 +168,14 @@
 
 	@Override
 	public void setMastershipId(String id) {
-		// TODO Synchronisation?
 		mastershipId = id;
 	}
 
 	@Override
 	public String getMastershipId() {
-		// TODO Synchronisation?
 		return mastershipId;
 	}
 	
-	/*
-	 * ConnectionStateListener
-	 */
-	
-	@Override
-	public void stateChanged(CuratorFramework client, ConnectionState state) {
-		// TODO Auto-generated method stub
-		log.debug("Connection state change: {}", state);
-		
-		switch (state){
-		case SUSPENDED:
-		case LOST:
-			//If we're suspended or lost, we can no longer assume mastership
-			for (Map.Entry<String, MastershipCallback> entry : switchCallbacks.entrySet()){
-				entry.getValue().changeCallback(HexString.toLong(entry.getKey()), false);
-			}
-			break;
-		default:
-			//CONNECTED or RECONNECTED
-			//LeaderLatches should automatically try and re-gain the leadership
-			break;
-		}
-	}
 	
 	/*
 	 * IFloodlightModule
@@ -201,10 +202,9 @@
 		return null;
 	}
 	
-	//be ready to serve mastership requests by startup?
 	@Override
 	public void init (FloodlightModuleContext context) throws FloodlightModuleException {
-		//TODO
+
 		try {
 			String localHostname = java.net.InetAddress.getLocalHost().getHostName();
 			mastershipId = localHostname;
@@ -229,35 +229,36 @@
 	
 	@Override
 	public void startUp (FloodlightModuleContext context) {
-		//TODO
-		return;
+		// Nothing to be done on startup
 	}
 	
 	public static void main(String args[]){
 		FloodlightModuleContext fmc = new FloodlightModuleContext();
 		MastershipManager mm = new MastershipManager();
 		
-		if (args.length < 1){
-			log.error("Need to supply ID");
-			System.exit(1);
+		String id = null;
+		if (args.length > 0){
+			id = args[0];
+			log.info("Using unique id: {}", id);
 		}
-		String id = args[0];
 		
 		try {
 			mm.init(fmc);
 			mm.startUp(fmc);
 			
-			mm.setMastershipId(id);
-			
+			if (id != null){
+				mm.setMastershipId(id);
+			}
+				
 			mm.acquireMastership(1L, 
 				new MastershipCallback(){
 					@Override
 					public void changeCallback(long dpid, boolean isMaster) {
 						if (isMaster){
-							log.debug("I'm master for {}", HexString.toHexString(dpid));
+							log.debug("Callback for becoming master for {}", HexString.toHexString(dpid));
 						}
 						else {
-							log.debug("NOT master for {}", HexString.toHexString(dpid));
+							log.debug("Callback for losing mastership for {}", HexString.toHexString(dpid));
 						}
 					}
 				});
@@ -268,10 +269,10 @@
 			}
 			
 		} catch (FloodlightModuleException e) {
-			// TODO Auto-generated catch block
 			e.printStackTrace();
 		} catch (InterruptedException e) {
-			// TODO Auto-generated catch block
+			e.printStackTrace();
+		} catch (Exception e) {
 			e.printStackTrace();
 		}