code: public void uncacheContainerPage(CmsUUID structureId, boolean online) {
  
          try {
              m_lock.writeLock().lock();
              if (online) {
                  m_containerPagesOnline.remove(getCacheKey(structureId, true));
                  m_containerPagesOnline.remove(getCacheKey(structureId, false));
              } else {
                  m_containerPagesOffline.remove(getCacheKey(structureId, true));
                  m_containerPagesOffline.remove(getCacheKey(structureId, false));
              }
          } finally {
              m_lock.writeLock().unlock();
          }
      }
docs: Removes the container page identified by its structure id from the cache.<p>
  
  @param structureId the container page's structure id
  @param online if online or offline