1 files changed, 4 insertions, 0 deletions

diff --git a/src/cachecalc.h b/src/cachecalc.h
index dd9712f..7fdb16e 100644
--- a/src/cachecalc.h
+++ b/src/cachecalc.h
@@ -3,6 +3,8 @@
 
 #include "bu/trace.h"
 
+#include <time.h>
+
 namespace Bu
 {
         template<class obtype, class keytype> class Cache;
@@ -27,6 +29,8 @@ namespace Bu
 
                 virtual void onLoad( obtype *pSrc, const keytype &key )=0;
                 virtual void onUnload( obtype *pSrc, const keytype &key )=0;
+                virtual bool shouldSync( obtype *pSrc, const keytype &key,
+                        time_t tLastSync )=0;
                 virtual void onTick() { };
 
         protected: