package com.atlassian.cache.hazelcast;
   
   import com.hazelcast.core.HazelcastInstance;
   import com.hazelcast.core.IAtomicLong;
   
   import static com.google.common.base.Preconditions.checkNotNull;
   
   class CacheVersion
   {
      public static final String CACHE_VERSION_PREFIX = "_CACHE_VERSION.";
  
      private final IAtomicLong version;
  
      public CacheVersion(HazelcastInstance instance, String cacheName)
      {
          this.version = checkNotNull(instance, "instance").getAtomicLong(CACHE_VERSION_PREFIX.concat(checkNotNull(cacheName, "cacheName")));
      }
  
      /**
       * Returns current cache version
       */
      public long get()
      {
          return version.get();
      }
  
      /**
       * Increments and then return current cache version. Atomic.
       */
      public long incrementAndGet()
      {
          return version.incrementAndGet();
      }
  
  
  }