类的使用
com.x.collaboration.service.message.AbstractMessage

com.x.collaboration.service.message中AbstractMessage的使用

com.x.collaboration.service.message中AbstractMessage的子类

限定符和类型	类和说明
class	BroadcastMessage
class	ChatMessage
class	FileEditorMessage
class	FileShareMessage
class	PlainMessage
class	ReadMessage
class	ReviewMessage
class	TaskMessage