2 files changed, 20 insertions, 1 deletions

diff --git a/include/opkele/association.h b/include/opkele/association.h
index a8f3915..72eff5b 100644
--- a/include/opkele/association.h
+++ b/include/opkele/association.h
@@ -62,4 +62,6 @@ namespace opkele {
             virtual int expires_in() const { return _expires-time(0); }
             virtual bool stateless() const { return _stateless; }
+
+            virtual bool is_expired() const { return _expires<time(0); }
     };
 
diff --git a/include/opkele/consumer.h b/include/opkele/consumer.h
index 042e2d1..b9d1e54 100644
--- a/include/opkele/consumer.h
+++ b/include/opkele/consumer.h
@@ -14,4 +14,9 @@ namespace opkele {
     /**
      * implementation of basic consumer functionality
+     *
+     * @note
+     * The consumer uses libcurl internally, which means that if you're using
+     * libopkele in multithreaded environment you should call curl_global_init
+     * yourself before spawning any threads.
      */
     class consumer_t {
@@ -32,8 +37,14 @@ namespace opkele {
              * in the real implementation to provide persistent assocations
              * store.
+             *
+             * @note
+             * The user is responsible for handling associations expiry and
+             * this function should never return an expired or invalidated
+             * association.
+             *
              * @param server the OpenID server
              * @param handle association handle
              * @return the autho_ptr<> for the newly allocated association_t object
-             * @throw failed_lookup in case of error
+             * @throw failed_lookup if no unexpired association found
              */
             virtual assoc_t retrieve_assoc(const string& server,const string& handle) = 0;
@@ -49,4 +60,10 @@ namespace opkele {
              * function is not overridden in the real implementation, the new
              * association will be established for each request.
+             *
+             * @note
+             * The user is responsible for handling associations and this
+             * function should never return an expired or invalidated
+             * association.
+             *
              * @param server the OpenID server
              * @return the auto_ptr<> for the newly allocated association_t object