code: public void remove(String correlationId, String key) {
  		synchronized (_lock) {
  			// Get the entry
  			CacheEntry entry = _cache.get(key);
  
  			// Remove entry from the cache
  			if (entry != null) {
  				_cache.remove(key);
  				_count--;
  			}
  		}
  	}
docs: Removes a value from the cache by its key.
  
  @param correlationId (optional) transaction id to trace execution through
  call chain.
  @param key           a unique value key.