code: public Object getMCWFromMctoMCWMap(Object mc) {
          Object mcw = null;
          mcToMCWMapRead.lock();
          try {
              mcw = mcToMCWMap.get(mc);
          } finally {
              mcToMCWMapRead.unlock();
          }
          return mcw;
      }
docs: Get the mcw from the hash map
  
  @param mc
  @return