Fix cluster elder calculation to ensure unique elder.

Race condition in the previous algorithm allowed several cluster
members to consider themselves the elder.


git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@903826 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 7 insertions, 0 deletions

diff --git a/cpp/src/qpid/cluster/MemberSet.cpp b/cpp/src/qpid/cluster/MemberSet.cpp
index 5dc148609f..0fdf4a8f96 100644
--- a/cpp/src/qpid/cluster/MemberSet.cpp
+++ b/cpp/src/qpid/cluster/MemberSet.cpp
@@ -25,6 +25,13 @@
 namespace qpid {
 namespace cluster {
 
+std::string encodeMemberSet(const MemberSet& m) {
+    std::string addresses;
+    for (MemberSet::const_iterator i = m.begin(); i != m.end(); ++i)
+        addresses.append(i->str());
+    return addresses;
+}
+
 MemberSet decodeMemberSet(const std::string& s) {
     MemberSet set;
     for (std::string::const_iterator i = s.begin(); i < s.end(); i += 8) {