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Implemented to indicate they want notification of half-closes.
TCP supports the notion of half-closing the connection, e.g. closing the write side but still not stopping reading. A protocol that implements this interface will be notified of such events, instead of having connectionLost called.
||Notification of the read connection being closed.|
||Notification of the write connection being closed.|
Notification of the read connection being closed.
This indicates peer did half-close of write side. It is now the responsibility of the this protocol to call loseConnection(). In addition, the protocol MUST make sure a reference to it still exists (i.e. by doing a callLater with one of its methods, etc.) as the reactor will only have a reference to it if it is writing.
If the protocol does not do so, it might get garbage collected without the connectionLost method ever being called.