ListenerObject not found in imports for Ehcache 3? -

i trying implement listener ehcache 3.3.1 project using code below. can suggest solution listenerobject? can't seem find anywhere,except on docs page got code from

import java.util.logging.level; import java.util.logging.logger; import org.ehcache.cache; import org.ehcache.cachemanager; import org.ehcache.config.builders.cacheconfigurationbuilder; import org.ehcache.config.builders.cacheeventlistenerconfigurationbuilder; import org.ehcache.config.builders.cachemanagerbuilder; import org.ehcache.config.builders.resourcepoolsbuilder; import org.ehcache.event.eventtype;  public class cachehandler{      private logger log = logger.getlogger(this.getclass().getname());      private string cachename="basiccache";      public cache cache;       public cachehandler(){          if(cache==null)              cache=initcache();      }      private cache initcache(){        cacheeventlistenerconfigurationbuilder cacheeventlistenerconfiguration = cacheeventlistenerconfigurationbuilder            .neweventlistenerconfiguration(new listenerobject(), eventtype.created, eventtype.updated)             .unordered().asynchronous();          final cachemanager manager = cachemanagerbuilder.newcachemanagerbuilder()            .withcache(cachename,                cacheconfigurationbuilder.newcacheconfigurationbuilder(string.class, string.class, resourcepoolsbuilder.heap(10))                    .add(cacheeventlistenerconfiguration)             ).build(true);         final cache<string, string> cache = manager.getcache("foo", string.class, string.class);        return cache;      }       public cache getcache(){         if(cache==null)             cache=initcache();          return cache;                 } } 

it indeed not mentioned since 1 method easy figure out.

here example:

public class listenerobject implements cacheeventlistener<object, object> {   @override   public void onevent(cacheevent<? extends object, ? extends object> event) {     system.out.println(event);   } } 

the real 1 used in documentation here.

then, i've played bit code real production usable code.

public class cachehandler implements autocloseable {   private static final string cache_name = "basiccache";   private final cache<string, string> cache;   private final cachemanager cachemanager;    public cachehandler() {     cachemanager = initcachemanager();     cache = cachemanager.getcache(cache_name, string.class, string.class);   }    private cachemanager initcachemanager(){     cacheeventlistenerconfigurationbuilder cacheeventlistenerconfiguration = cacheeventlistenerconfigurationbuilder       .neweventlistenerconfiguration(new listenerobject(), eventtype.created, eventtype.updated)       .ordered().synchronous();      return cachemanagerbuilder.newcachemanagerbuilder()       .withcache(cache_name,         cacheconfigurationbuilder.newcacheconfigurationbuilder(string.class, string.class, resourcepoolsbuilder.heap(10))           .add(cacheeventlistenerconfiguration)       ).build(true);   }    public cache getcache(){     return cache;   }    @override   public void close() {     cachemanager.close();   }    public static void main(string[] args) {     try(cachehandler handler = new cachehandler()) {       cache<string, string> cache = handler.getcache();       cache.put("a", "b");       cache.putifabsent("a", "c");     }    } } 

some comments:

• i assumed want singleton cache kept in variable. that's did. lazy initcache wasn't useful because withcache tells ehcache create cache when creating cache manager.
• we want keep reference cachemanager in order close @ end.
• the getcache retrieving "foo", not "basiccache"

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