Need to execute code before Ignite cache ExpiryPolicy

Question

I am using Ignite cache with ModifiedExpiryPolicy and need to execute a line of code before event execution. Any help?

IgniteCache<String, Object> expiresCache = cache.withExpiryPolicy(new ModifiedExpiryPolicy(new Duration(Time.MINUTES, timeInMins)));

public class ClassName {
public IgnitePredicate<CacheEvent> functionName() {
    return new IgnitePredicate<CacheEvent>() {  
        @Override
        public boolean apply(CacheEvent evt) {
            //code to be executed after event.
            return true;
            }
        };
    }
}

Answer 1

I think you need to use events to listen for expiry events.

Ignite ignite = Ignition.ignite();

// Local listener that listenes to local events.
IgnitePredicate<CacheEvent> locLsnr = evt -> {
  System.out.println("Received expiry event [evt=" + evt.name() + ", key=" + evt.key());

  return true; // Continue listening.
};

// Subscribe to specified cache events occuring on local node.
ignite.events().localListen(locLsnr, EventType.EVT_CACHE_OBJECT_EXPIRED);

Note that this is just a local (node) listener, you'll need a remote listener to find expiry events on remote nodes. You'll also need to configure includeEventTypes in your configuration file (events are disabled by default for performance reasons.