Paxos: Remove roundId parameter.

3 files changed, 24 insertions, 45 deletions

diff --git a/same/src/main/java/com/orbekk/paxos/MasterProposer.java b/same/src/main/java/com/orbekk/paxos/MasterProposer.java
index 3a451d0..912de7e 100644
--- a/same/src/main/java/com/orbekk/paxos/MasterProposer.java
+++ b/same/src/main/java/com/orbekk/paxos/MasterProposer.java
@@ -17,11 +17,11 @@ public class MasterProposer {
         this.connections = connections;
     }
     
-    private boolean internalPropose(int roundId, int proposalNumber) {
+    private boolean internalPropose(int proposalNumber) {
         int promises = 0;
         for (String url : paxosUrls) {
             PaxosService paxos = connections.getPaxos(url);
-            boolean success = paxos.propose(myUrl, roundId, proposalNumber);
+            boolean success = paxos.propose(myUrl, proposalNumber);
             if (success) {
                 promises += 1;
             }
@@ -29,11 +29,11 @@ public class MasterProposer {
         return promises > paxosUrls.size() / 2;
     }
     
-    private boolean internalAcceptRequest(int roundId, int proposalNumber) {
+    private boolean internalAcceptRequest(int proposalNumber) {
         int accepts = 0;
         for (String url : paxosUrls) {
             PaxosService paxos = connections.getPaxos(url);
-            boolean success = paxos.acceptRequest(myUrl, roundId, proposalNumber);
+            boolean success = paxos.acceptRequest(myUrl, proposalNumber);
             if (success) {
                 accepts += 1;
             }
@@ -41,11 +41,11 @@ public class MasterProposer {
         return accepts > paxosUrls.size() / 2;        
     }
 
-    public boolean propose(int roundId, int proposalNumber) {
+    public boolean propose(int proposalNumber) {
         boolean success = false;
-        success = internalPropose(roundId, proposalNumber);
+        success = internalPropose(proposalNumber);
         if (success) {
-            success = internalAcceptRequest(roundId, proposalNumber);
+            success = internalAcceptRequest(proposalNumber);
         }
         if (success) {
             return true;
diff --git a/same/src/main/java/com/orbekk/paxos/PaxosService.java b/same/src/main/java/com/orbekk/paxos/PaxosService.java
index b650ed5..b515fa9 100644
--- a/same/src/main/java/com/orbekk/paxos/PaxosService.java
+++ b/same/src/main/java/com/orbekk/paxos/PaxosService.java
@@ -1,6 +1,6 @@
 package com.orbekk.paxos;
 
 public interface PaxosService {
-    boolean propose(String clientUrl, int roundId, int proposalNumber);
-    boolean acceptRequest(String clientUrl, int roundId, int proposalNumber); 
+    boolean propose(String clientUrl, int proposalNumber);
+    boolean acceptRequest(String clientUrl, int proposalNumber); 
 }
diff --git a/same/src/main/java/com/orbekk/paxos/PaxosServiceImpl.java b/same/src/main/java/com/orbekk/paxos/PaxosServiceImpl.java
index 70e1618..1e8387e 100644
--- a/same/src/main/java/com/orbekk/paxos/PaxosServiceImpl.java
+++ b/same/src/main/java/com/orbekk/paxos/PaxosServiceImpl.java
@@ -8,8 +8,8 @@ import org.slf4j.LoggerFactory;
  */
 public class PaxosServiceImpl implements PaxosService {
     private Logger logger = LoggerFactory.getLogger(getClass());
-    private int roundId = 0;
     private int highestPromise = 0;
+    private int highestAcceptedValue = 0;
     private String tag = "";
 
     public PaxosServiceImpl(String tag) {
@@ -17,57 +17,36 @@ public class PaxosServiceImpl implements PaxosService {
     }
 
     @Override
-    public synchronized boolean propose(String clientUrl, int roundId,
+    public synchronized boolean propose(String clientUrl,
             int proposalNumber) {
-        if (roundId > this.roundId) {
-            newRound(roundId);
-        }
-        if (roundId < this.roundId) {
-            logger.info(tag + "propose({}, {}, {}) = rejected " +
-                    "(current round: {})",
-                    new Object[]{clientUrl, roundId, proposalNumber,
-                            this.roundId});
-            return false;
-        }
-
         if (proposalNumber > highestPromise) {
             highestPromise = proposalNumber;
-            logger.info(tag + "propose({}, {}, {}) = accepted",
-                    new Object[]{clientUrl, roundId, proposalNumber});
+            logger.info(tag + "propose({}, {}) = accepted",
+                    new Object[]{clientUrl, proposalNumber});
             return true;
         } else {
-            logger.info(tag + "propose({}, {}, {}) = rejected " +
+            logger.info(tag + "propose({}, {}) = rejected " +
                     "(promised: {})",
-                    new Object[]{clientUrl, roundId, proposalNumber,
+                    new Object[]{clientUrl, proposalNumber,
                             highestPromise});
             return false;
         }
     }
 
     @Override
-    public synchronized boolean acceptRequest(String clientUrl, int roundId,
+    public synchronized boolean acceptRequest(String clientUrl,
             int proposalNumber) {
-        if (roundId == this.roundId && proposalNumber == highestPromise) {
-            logger.info(tag + "acceptRequest({}, {}, {}) = accepted",
-                    new Object[]{clientUrl, roundId, proposalNumber});
-            finishRound();
+        if (proposalNumber == highestPromise) {
+            logger.info(tag + "acceptRequest({}, {}) = accepted",
+                    new Object[]{clientUrl, proposalNumber});
+            highestAcceptedValue = proposalNumber;
             return true;
         } else {
-            logger.info(tag + "acceptRequest({}, {}, {}) = rejected " +
-                    "(roundId={}, promise={})",
-                    new Object[]{clientUrl, roundId, proposalNumber,
-                            this.roundId, highestPromise});
+            logger.info(tag + "acceptRequest({}, {}) = rejected " +
+                    "(promise={})",
+                    new Object[]{clientUrl, proposalNumber,
+                            highestPromise});
             return false;
         }
     }
-
-    private synchronized void finishRound() {
-        newRound(roundId + 1);
-    }
-
-    private synchronized void newRound(int roundId) {
-        logger.info(tag + "new round: {}", roundId);
-        this.roundId = roundId;
-        highestPromise = 0;
-    }
 }