code: public PluginsAlertConditionCache pluginsAlertConditions(long policyId)
      {
          PluginsAlertConditionCache cache = pluginsConditions.get(policyId);
          if(cache == null)
              pluginsConditions.put(policyId, cache = new PluginsAlertConditionCache(policyId));
          return cache;
      }
docs: Returns the cache of Plugins alert conditions for the given policy, creating one if it doesn't exist .
  @param policyId The id of the policy for the cache of Plugins alert conditions
  @return The cache of Plugins alert conditions for the given policy