Adding more JMX infos.

src/main/java/com/couchbase/spring/monitor/ClusterInfo.java

@@ -1,10 +1,13 @@
 package com.couchbase.spring.monitor;
 
 import com.couchbase.client.CouchbaseClient;
+import org.springframework.jmx.export.annotation.ManagedAttribute;
 import org.springframework.jmx.export.annotation.ManagedOperation;
 import org.springframework.jmx.export.annotation.ManagedResource;
-
 import java.net.SocketAddress;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
 /**
  * Exposes basic cluster information.
@@ -16,7 +19,7 @@ public class ClusterInfo extends AbstractMonitor {
     super(client);
   }
 
-  @ManagedOperation(description = "Cluster Hostnames")
+  @ManagedAttribute(description = "All hostnames of nodes in the cluster")
   public String getHostNames() {
     StringBuilder result = new StringBuilder();
     for (SocketAddress node : getStats().keySet()) {
@@ -25,9 +28,22 @@ public class ClusterInfo extends AbstractMonitor {
     return result.toString();
   }
 
-  @ManagedOperation(description = "Number of Nodes")
+  @ManagedAttribute(description = "Number of nodes currently in the cluster")
   public int getNumberOfNodes() {
     return getStats().keySet().size();
   }
 
+  @ManagedAttribute(description = "Couchbase Server versions of nodes in the cluster")
+  public String getNodeVersions() {
+    StringBuilder result = new StringBuilder();
+    for(Map.Entry<SocketAddress,Map<String,String>> entry : getStats().entrySet()) {
+      for(Map.Entry<String, String> stat : entry.getValue().entrySet()) {
+        if (stat.getKey().equals("ep_version")) {
+          result.append(stat.getValue()).append(",");
+        }
+      }
+    }
+    return result.toString();
+  }
+
 }