token_metadata: Add is_member

locator/token_metadata.cc

@@ -180,6 +180,12 @@ const auto& token_metadata::get_endpoint_to_host_id_map_for_reading() {
     return _endpoint_to_host_id_map;
 }
 
-
+bool token_metadata::is_member(inet_address endpoint) {
+    auto beg = _token_to_endpoint_map.cbegin();
+    auto end = _token_to_endpoint_map.cend();
+    return end != std::find_if(beg, end, [endpoint] (const auto& x) {
+        return x.second == endpoint;
+    });
+}
 
 }

locator/token_metadata.hh

@@ -426,21 +426,11 @@ public:
         return getTokens(endpoint).iterator().next();
     }
 
-    public boolean isMember(InetAddress endpoint)
-    {
-        assert endpoint != null;
+#endif
 
-        lock.readLock().lock();
-        try
-        {
-            return tokenToEndpointMap.inverse().containsKey(endpoint);
-        }
-        finally
-        {
-            lock.readLock().unlock();
-        }
-    }
+    bool is_member(inet_address endpoint);
 
+#if 0
     public boolean isLeaving(InetAddress endpoint)
     {
         assert endpoint != null;