com.jivesoftware.forum.database.DbForum.setName(String name)：

public void setName(String name) throws ForumAlreadyExistsException {

if (this.name.equals(name)) {

return;

}

try {

if (!this.name.toLowerCase().equals(name.toLowerCase()))

{

Forum forum = factory.getForum(name);

throw new ForumAlreadyExistsException();

}

}catch (ForumNotFoundException e) { }

factory.cacheManager.forumCache.remove(id);

this.name = name;

saveToDb();

factory.cacheManager.forumCache.remove(id);

}

代码中 Forum forum = factory.getForum(name);

factory.cacheManager.forumCache.remove(id);

这两个地方用意是什么？（我的问题可能幼稚，确实看了很久没理清。）