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authorKjetil Ørbekk <kjetil.orbekk@gmail.com>2012-03-20 12:28:50 +0100
committerKjetil Ørbekk <kjetil.orbekk@gmail.com>2012-03-20 12:28:55 +0100
commit6299172d3b9ba0b98b77583c0c3c5fc90d1b7db5 (patch)
tree9cb382dd5b2cdcd4e3508a9caf9d0fbb21a17e75 /same/src/main/java/com
parent9b4a756388aef165b892ae478cf1b0cbf1d7130b (diff)
Master has to advertise its ID when taking over.
Diffstat (limited to 'same/src/main/java/com')
-rw-r--r--same/src/main/java/com/orbekk/same/Client.java25
-rw-r--r--same/src/main/java/com/orbekk/same/ClientService.java2
-rw-r--r--same/src/main/java/com/orbekk/same/Master.java4
-rw-r--r--same/src/main/java/com/orbekk/same/MasterController.java2
-rw-r--r--same/src/main/java/com/orbekk/same/SameController.java6
5 files changed, 27 insertions, 12 deletions
diff --git a/same/src/main/java/com/orbekk/same/Client.java b/same/src/main/java/com/orbekk/same/Client.java
index 4f42c4e..18fecd2 100644
--- a/same/src/main/java/com/orbekk/same/Client.java
+++ b/same/src/main/java/com/orbekk/same/Client.java
@@ -26,7 +26,7 @@ public class Client implements DiscoveryListener {
State state;
private String myUrl;
String masterUrl;
- private int masterId = -1;
+ private int masterId = 0;
private MasterController masterController = null;
private Broadcaster broadcaster;
private Future<Integer> currentMasterProposal = null;
@@ -125,6 +125,12 @@ public class Client implements DiscoveryListener {
@Override
public void masterTakeover(String masterUrl, String networkName,
int masterId) throws Exception {
+ 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();
@@ -133,8 +139,13 @@ public class Client implements DiscoveryListener {
}
@Override
- public void masterDown() throws Exception {
- logger.info("Master is down.");
+ public void masterDown(int masterId) throws Exception {
+ if (masterId < Client.this.masterId) {
+ logger.info("Master {} is down, but current master is {}. Ignoring.",
+ masterId, Client.this.masterId);
+ return;
+ }
+ logger.warn("Master down.");
connectionState = ConnectionState.UNSTABLE;
tryBecomeMaster();
}
@@ -282,7 +293,7 @@ public class Client implements DiscoveryListener {
} catch (CancellationException e) {
}
if (!currentMasterProposal.isCancelled() && result != null) {
- masterController.enableMaster(state);
+ masterController.enableMaster(state, result);
}
}
@@ -293,13 +304,17 @@ public class Client implements DiscoveryListener {
}
}
+ private int getMasterIdEstimate() {
+ return masterId;
+ }
+
public void startMasterElection() {
List<String> participants = state.getList(".participants");
broadcaster.broadcast(participants, new ServiceOperation() {
@Override public void run(String url) {
ClientService client = connections.getClient(url);
try {
- client.masterDown();
+ client.masterDown(getMasterIdEstimate());
} catch (Exception e) {
logger.info("{}.masterDown() did not respond (ignored): " +
url, e);
diff --git a/same/src/main/java/com/orbekk/same/ClientService.java b/same/src/main/java/com/orbekk/same/ClientService.java
index dfca2cc..f1247a5 100644
--- a/same/src/main/java/com/orbekk/same/ClientService.java
+++ b/same/src/main/java/com/orbekk/same/ClientService.java
@@ -18,5 +18,5 @@ public interface ClientService {
int masterId) throws Exception;
/** The master is down, so start a new master election. */
- void masterDown() throws Exception;
+ void masterDown(int masterId) throws Exception;
}
diff --git a/same/src/main/java/com/orbekk/same/Master.java b/same/src/main/java/com/orbekk/same/Master.java
index 4402487..32d6ec2 100644
--- a/same/src/main/java/com/orbekk/same/Master.java
+++ b/same/src/main/java/com/orbekk/same/Master.java
@@ -136,7 +136,7 @@ public class Master {
}
/** This master should take over from an earlier master. */
- public void resumeFrom(State lastKnownState) {
+ public void resumeFrom(State lastKnownState, final int masterId) {
state = lastKnownState;
broadcaster.broadcast(state.getList(".participants"),
new ServiceOperation() {
@@ -145,7 +145,7 @@ public class Master {
ClientService client = connections.getClient(url);
try {
client.masterTakeover(myUrl,
- state.getDataOf(".networkName"), 0);
+ state.getDataOf(".networkName"), masterId);
} catch (Exception e) {
logger.info("Client {} failed to acknowledge new master. " +
"Removing {}", url);
diff --git a/same/src/main/java/com/orbekk/same/MasterController.java b/same/src/main/java/com/orbekk/same/MasterController.java
index 05ff91b..155fc4c 100644
--- a/same/src/main/java/com/orbekk/same/MasterController.java
+++ b/same/src/main/java/com/orbekk/same/MasterController.java
@@ -1,6 +1,6 @@
package com.orbekk.same;
public interface MasterController {
- void enableMaster(State lastKnownState);
+ void enableMaster(State lastKnownState, int masterId);
void disableMaster();
}
diff --git a/same/src/main/java/com/orbekk/same/SameController.java b/same/src/main/java/com/orbekk/same/SameController.java
index ceeca73..8788be0 100644
--- a/same/src/main/java/com/orbekk/same/SameController.java
+++ b/same/src/main/java/com/orbekk/same/SameController.java
@@ -37,13 +37,13 @@ public class SameController {
private MasterController masterController = new MasterController() {
@Override
- public void enableMaster(State lastKnownState) {
+ public void enableMaster(State lastKnownState, int masterId) {
String masterUrl = configuration.get("baseUrl") +
"MasterService.json";
master = Master.create(connections, serviceBroadcaster,
masterUrl, configuration.get("networkName"));
if (lastKnownState != null) {
- master.resumeFrom(lastKnownState);
+ master.resumeFrom(lastKnownState, masterId);
}
master.start();
masterService.setService(master.getService());
@@ -173,7 +173,7 @@ public class SameController {
public void createNetwork(String networkName) {
masterController.disableMaster();
- masterController.enableMaster(null);
+ masterController.enableMaster(null, 1);
String masterUrl = configuration.get("baseUrl") +
"MasterService.json";
joinNetwork(masterUrl);