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    mod addr;
    mod ping;
    mod sync;

    use bytes::Bytes;
    use message::Error;
    use message::common::Command;

    pub use self::addr::{AddrProtocol, SeednodeProtocol};
    pub use self::ping::PingProtocol;
    pub use self::sync::{SyncProtocol, InboundSyncConnection, InboundSyncConnectionRef, OutboundSyncConnection, OutboundSyncConnectionRef, LocalSyncNode, LocalSyncNodeRef};

    pub trait Protocol: Send {
    	/// Initialize the protocol.
    	fn initialize(&mut self) {}

    	/// Maintain the protocol.
    	fn maintain(&mut self) {}

    	/// Handle the message.
    	fn on_message(&mut self, command: &Command, payload: &Bytes) -> Result<(), Error>;

    	/// On disconnect.
    	fn on_close(&mut self) {}

    	/// Boxes the protocol.
    	fn boxed(self) -> Box<Protocol> where Self: Sized + 'static {
    		Box::new(self)
    	}
    }

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