From f0ec603696bcec885f74bf5a8ce69d2ea07776f1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kjetil=20=C3=98rbekk?= <kjetil.orbekk@gmail.com>
Date: Tue, 20 Mar 2012 15:34:54 +0100
Subject: Various fixes related to takeover.

---
 same/src/main/java/com/orbekk/same/App.java    |  7 +++++--
 same/src/main/java/com/orbekk/same/Client.java | 18 ++++++++++++------
 same/src/main/java/com/orbekk/same/Master.java | 18 ++++++++++++++----
 3 files changed, 31 insertions(+), 12 deletions(-)

diff --git a/same/src/main/java/com/orbekk/same/App.java b/same/src/main/java/com/orbekk/same/App.java
index b084db2..464668d 100644
--- a/same/src/main/java/com/orbekk/same/App.java
+++ b/same/src/main/java/com/orbekk/same/App.java
@@ -14,8 +14,11 @@ public class App {
         try {
             controller.start();
             controller.searchNetworks();
-            controller.createNetwork(configuration.get("networkName"));
-            controller.joinNetwork(configuration.get("masterUrl"));
+            if ("true".equals(configuration.get("isMaster"))) {
+                controller.createNetwork(configuration.get("networkName"));
+            } else {
+                controller.joinNetwork(configuration.get("masterUrl"));
+            }
             controller.join();
         } catch (Exception e) {
             logger.error("Error in App.", e);
diff --git a/same/src/main/java/com/orbekk/same/Client.java b/same/src/main/java/com/orbekk/same/Client.java
index 1927731..e789f2e 100644
--- a/same/src/main/java/com/orbekk/same/Client.java
+++ b/same/src/main/java/com/orbekk/same/Client.java
@@ -126,14 +126,14 @@ public class Client implements DiscoveryListener {
         @Override
         public synchronized void masterTakeover(String masterUrl, String networkName, 
                 int masterId) throws Exception {
+            logger.info("MasterTakeover({}, {}, {})",
+                    new Object[]{masterUrl, networkName, masterId});
             if (masterId <= Client.this.masterId) {
                 logger.warn("{}:{} tried to take over, but current master is " +
                 		"{}:{}. Ignoring", new Object[]{masterUrl, masterId,
                                 state.getDataOf(".masterUrl"),
                                 Client.this.masterId}); 
             }
-            logger.info("MasterTakeover({}, {}, {})",
-                    new Object[]{masterUrl, networkName, masterId});
             abortMasterElection();
             Client.this.masterUrl = masterUrl;
             Client.this.masterId = masterId;
@@ -195,7 +195,7 @@ public class Client implements DiscoveryListener {
         this.masterController = masterController;
     }
     
-    private void reset() {
+    private synchronized void reset() {
         state.clear();
         masterId = 0;
     }
@@ -265,16 +265,22 @@ public class Client implements DiscoveryListener {
         return serviceImpl;
     }
     
-    private List<String> getPaxosUrls() {
+    private List<String> getPaxosUrlsNoMaster() {
         List<String> paxosUrls = new ArrayList<String>();
         for (String participant : state.getList(".participants")) {
-            paxosUrls.add(participant.replace("ClientService", "PaxosService"));
+            String masterPaxos = state.getDataOf(".masterUrl")
+                    .replace("MasterService", "PaxosService");
+            String paxos = participant.replace("ClientService", "PaxosService");
+            if (!paxos.equals(masterPaxos)) {
+                paxosUrls.add(participant.replace("ClientService", "PaxosService"));
+            }
         }
+        logger.info("Paxos urls: {}", paxosUrls);
         return paxosUrls;
     }
     
     private void tryBecomeMaster(int failedMasterId) {
-        List<String> paxosUrls = getPaxosUrls();
+        List<String> paxosUrls = getPaxosUrlsNoMaster();
         MasterProposer proposer = new MasterProposer(getUrl(), paxosUrls,
                 connections);
         if (masterController == null) {
diff --git a/same/src/main/java/com/orbekk/same/Master.java b/same/src/main/java/com/orbekk/same/Master.java
index 3bb6260..ade0b1e 100644
--- a/same/src/main/java/com/orbekk/same/Master.java
+++ b/same/src/main/java/com/orbekk/same/Master.java
@@ -80,6 +80,20 @@ public class Master {
             List<String> pending = getAndClear();
             logger.info("Sending full state to {}", pending);
             final List<Component> components = state.getComponents();
+            broadcaster.broadcast(pending, new ServiceOperation() {
+                @Override public void run(String url) {
+                    ClientService client = connections.getClient(url);
+                    try {
+                        client.masterTakeover(
+                                state.getDataOf(".masterUrl"),
+                                state.getDataOf(".networkName"),
+                                masterId);
+                    } catch (Exception e) {
+                        logger.info("Client {} failed to acknowledge master. Remove.");
+                        removeParticipant(url);
+                    }
+                }
+            });
             broadcastNewComponents(pending, components);
         }
     };
@@ -120,10 +134,6 @@ public class Master {
             @Override public void run(String url) {
                 ClientService client = connections.getClient(url);
                 try {
-                    client.masterTakeover(
-                            state.getDataOf(".masterUrl"),
-                            state.getDataOf(".networkName"),
-                            masterId);
                     for (Component c : components) {
                         client.setState(c.getName(), c.getData(),
                                 c.getRevision());
-- 
cgit v1.2.3