From 0c1fe5d3169b069bc88c1de7375658c1c885487c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kjetil=20=C3=98rbekk?= <kjetil.orbekk@gmail.com>
Date: Mon, 12 Mar 2012 19:40:18 +0100
Subject: Client begins in disconnected state.

---
 same/src/main/java/com/orbekk/same/Client.java     | 34 ++++++++++++++++++++--
 .../main/java/com/orbekk/same/ClientService.java   |  9 ++++++
 2 files changed, 40 insertions(+), 3 deletions(-)

(limited to 'same/src/main/java/com/orbekk')

diff --git a/same/src/main/java/com/orbekk/same/Client.java b/same/src/main/java/com/orbekk/same/Client.java
index 693a1ba..35e3f0e 100644
--- a/same/src/main/java/com/orbekk/same/Client.java
+++ b/same/src/main/java/com/orbekk/same/Client.java
@@ -5,10 +5,10 @@ import static com.orbekk.same.StackTraceUtil.throwableToString;
 import java.util.ArrayList;
 import java.util.List;
 
-import org.codehaus.jackson.type.TypeReference;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.orbekk.paxos.MasterProposer;
 import com.orbekk.same.State.Component;
 import com.orbekk.same.discovery.DiscoveryListener;
 import com.orbekk.util.DelayedOperation;
@@ -21,6 +21,9 @@ public class Client implements DiscoveryListener {
     private ConnectionManager connections;
     private State state;
     private String myUrl;
+    private String masterUrl;
+    private int masterId = -1;
+    
     private List<StateChangedListener> stateListeners =
             new ArrayList<StateChangedListener>();
     private NetworkNotificationListener networkListener;
@@ -41,7 +44,11 @@ public class Client implements DiscoveryListener {
         @Override
         public DelayedOperation set(Component component) {
             DelayedOperation op = new DelayedOperation();
-            String masterUrl = state.getDataOf(".masterUrl");
+            if (connectionState != ConnectionState.STABLE) {
+                op.complete(DelayedOperation.Status.createError(
+                        "Not connected to master: " + connectionState));
+                return op;
+            }
             MasterService master = connections.getMaster(masterUrl);
             try {
                 boolean success = master.updateStateRequest(
@@ -83,7 +90,6 @@ public class Client implements DiscoveryListener {
     private ClientService serviceImpl = new ClientService() {
         @Override
         public void setState(String component, String data, long revision) throws Exception {
-            connectionState = ConnectionState.STABLE;
             boolean status = state.update(component, data, revision);
             if (status) {
                 for (StateChangedListener listener : stateListeners) {
@@ -108,6 +114,13 @@ public class Client implements DiscoveryListener {
         public void discoveryRequest(String remoteUrl) {
             discoveryThread.add(remoteUrl);
         }
+
+        @Override
+        public void masterTakeover(String masterUrl, String networkName, 
+                int masterId) throws Exception {
+            Client.this.masterUrl = masterUrl;
+            connectionState = ConnectionState.STABLE;
+        }
     };
 
     private WorkQueue<String> discoveryThread = new WorkQueue<String>() {
@@ -207,4 +220,19 @@ public class Client implements DiscoveryListener {
     public ClientService getService() {
         return serviceImpl;
     }
+    
+    private List<String> getPaxosUrls() {
+        List<String> paxosUrls = new ArrayList<String>();
+        for (String participant : state.getList(".participants")) {
+            paxosUrls.add(participant.replace("ClientService", "PaxosService"));
+        }
+        return paxosUrls;
+    }
+    
+    private void startMasterElection() {
+        List<String> paxosUrls = getPaxosUrls();
+        MasterProposer proposer = new MasterProposer(getUrl(), paxosUrls,
+                connections);
+        // TODO: Run election.
+    }
 }
diff --git a/same/src/main/java/com/orbekk/same/ClientService.java b/same/src/main/java/com/orbekk/same/ClientService.java
index 04f423d..453dfef 100644
--- a/same/src/main/java/com/orbekk/same/ClientService.java
+++ b/same/src/main/java/com/orbekk/same/ClientService.java
@@ -7,4 +7,13 @@ public interface ClientService {
 
     // Manual discovery request by client.
     void discoveryRequest(String remoteUrl) throws Exception;
+    
+    /** A new master takes over.
+     * 
+     * @param masterUrl The new master URL.
+     * @param masterId The ID of the new master. Only accept if this is higher
+     *      than the current master.
+     */
+    void masterTakeover(String masterUrl, String networkName,
+            int masterId) throws Exception;
 }
-- 
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