CacheLoader different expiry-delay or time-to-live for different keys

Question

I am now using a class which implements CacheLoader interface. Ii have two issues-
1. Different expiry-delay or time-to-live for different keys- how do i do this? I can specify only one expiry-delay in configuration file. And i am not calling cache.put() so i could specify ttl. We are trying to use same class for multiple keys. But problem is that we have different expiry-delay requirements for those keys. Do we have to use different cache for those keys? hoping to avoid that as we will have lots of them.
2. refresh-ahead-factor is not working.
We are using Coherence 3.4.2 GE
Below is the server configuration file
<cache-config>
<caching-scheme-mapping>
<cache-mapping>
          <cache-name>reference-data-cache</cache-name>
          <scheme-name>reference-data-cache-dist-scheme</scheme-name>
</cache-mapping>
</caching-scheme-mapping>
<caching-schemes>
     <distributed-scheme>
          <scheme-name>reference-data-cache-dist-scheme</scheme-name>
          <service-name>ReferenceDataBackingService</service-name>
          <backing-map-scheme>
               <read-write-backing-map-scheme>
                    <refresh-ahead-factor>0.2</refresh-ahead-factor>
                    <internal-cache-scheme>
                         <local-scheme>
                         <scheme-name>reference-local-scheme</scheme-name>
                         <eviction-policy>LRU</eviction-policy>
                         <expiry-delay>20m</expiry-delay>
                         <flush-delay>2m</flush-delay>
                         </local-scheme>
                    </internal-cache-scheme>
                    <cachestore-scheme>
                         <class-scheme>
                              <class-name>ReferenceDataLoader</class-name>
                              <init-params>
                                   <init-param>
                                        <param-type>java.lang.String</param-type>
                                        <param-value>{cache-name}</param-value>
                                   </init-param>
                              </init-params>
                         </class-scheme>
                    </cachestore-scheme>
               </read-write-backing-map-scheme>
          </backing-map-scheme>
          <autostart>true</autostart>
     </distributed-scheme>
</caching-schemes>

Answer 1

Hi
Refresh ahead is only activated when you do a get. Could this be the problem? Here is an excerpt from a good forum thread on this subject
Unable to get refresh-ahead functionality working
Yes, it works as expected. refresh-ahead works approximately like this :
public Object get(Object oKey) {
Entry entry = getEntry();
if (entry != null and entry is about to expire) {
schedule refresh();
Also, generic Coherence questions should be posted in this forum:
http://forums.oracle.com/forums/forum.jspa;jsessionid=8d92079330d63b6fca03d69245ae9170d4607c2284ca.e38QbNuQbx8Kbi0LbhaMaxuKahr0?forumID=480&start=0
thanks
Paul
Paul