Refactor Paxos: Return proposal values.

1 files changed, 8 insertions, 2 deletions

diff --git a/same/src/main/java/com/orbekk/paxos/PaxosService.java b/same/src/main/java/com/orbekk/paxos/PaxosService.java
index b515fa9..a92a794 100644
--- a/same/src/main/java/com/orbekk/paxos/PaxosService.java
+++ b/same/src/main/java/com/orbekk/paxos/PaxosService.java
@@ -1,6 +1,12 @@
 package com.orbekk.paxos;
 
 public interface PaxosService {
-    boolean propose(String clientUrl, int proposalNumber);
-    boolean acceptRequest(String clientUrl, int proposalNumber); 
+    
+    /**
+     * @return N == proposalNumber if a promise is made.
+     *      -M if another promise already was made, where M is the promise
+     *      highest proposal number.
+     */
+    int propose(String clientUrl, int proposalNumber);
+    int acceptRequest(String clientUrl, int proposalNumber); 
 }