2 files changed, 5 insertions, 2 deletions

diff --git a/include/opkele/types.h b/include/opkele/types.h
index 757c0af..8f4bf73 100644
--- a/include/opkele/types.h
+++ b/include/opkele/types.h
@@ -97,2 +97,7 @@ namespace opkele {
             virtual bool stateless() const = 0;
+            /**
+             * check whether the association is expired.
+             * @return true if expired
+             */
+            virtual bool is_expired() const = 0;
     };
diff --git a/lib/consumer.cc b/lib/consumer.cc
index af309c1..8f66688 100644
--- a/lib/consumer.cc
+++ b/lib/consumer.cc
@@ -146,4 +146,2 @@ namespace opkele {
             string ah = find_assoc(server)->handle();
-            if(ah->is_expired()) /* TODO: or should I throw some other exception to force programmer fix his implementation? */
-                throw failed_lookup(OPKELE_CP_ "find_assoc() has returned expired handle");
             p["assoc_handle"] = ah;