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package org.java_websocket;

import org.java_websocket.drafts.Draft;

import org.java_websocket.exeptions.InvalidDataException;

import org.java_websocket.framing.Framedata;

import org.java_websocket.handshake.ClientHandshake;

import org.java_websocket.handshake.Handshakedata;

import org.java_websocket.handshake.ServerHandshake;

import org.java_websocket.handshake.ServerHandshakeBuilder;

/**

* Implemented by <tt>WebSocketClient</tt> and <tt>WebSocketServer</tt>.

* The methods within are called by <tt>WebSocket</tt>.

* Almost every method takes a first parameter conn which represents the source of the respective event.

*/

public interface WebSocketListener {

/**

* Called on the server side when the socket connection is first established, and the WebSocket

* handshake has been received.

*

* @param conn

* The WebSocket related to this event

* @param draft

* The protocol draft the client uses to connect

* @param request

* The opening http message send by the client. Can be used to access additional fields like cookies.

* @return Returns an incomplete handshake containing all optional fields

* @throws InvalidDataException

* Throwing this exception will cause this handshake to be rejected

*/

public ServerHandshakeBuilder onWebsocketHandshakeReceivedAsServer( WebSocket conn, Draft draft, ClientHandshake request ) throws InvalidDataException;

/**

* Called on the client side when the socket connection is first established, and the WebSocket

* handshake response has been received.

*

* @param conn

* The WebSocket related to this event

* @param request

* The handshake initially send out to the server by this websocket.

* @param response

* The handshake the server sent in response to the request.

* @throws InvalidDataException

* Allows the client to reject the connection with the server in respect of its handshake response.

*/

public void onWebsocketHandshakeReceivedAsClient( WebSocket conn, ClientHandshake request, ServerHandshake response ) throws InvalidDataException;

/**

* Called on the client side when the socket connection is first established, and the WebSocket

* handshake has just been sent.

*

* @param conn

* The WebSocket related to this event

* @param request

* The handshake sent to the server by this websocket

* @throws InvalidDataException

* Allows the client to stop the connection from progressing

*/

public void onWebsocketHandshakeSentAsClient( WebSocket conn, ClientHandshake request ) throws InvalidDataException;

/**

* Called when an entire text frame has been received. Do whatever you want

* here...

*

* @param conn

* The <tt>WebSocket</tt> instance this event is occurring on.

* @param message

* The UTF-8 decoded message that was received.

*/

public void onWebsocketMessage( WebSocket conn, String message );

/**

* Called when an entire binary frame has been received. Do whatever you want

* here...

*

* @param conn

* The <tt>WebSocket</tt> instance this event is occurring on.

* @param blob

* The binary message that was received.

*/

public void onWebsocketMessage( WebSocket conn, byte[] blob );

/**

* Called after <var>onHandshakeReceived</var> returns <var>true</var>.

* Indicates that a complete WebSocket connection has been established,

* and we are ready to send/receive data.

*

* @param conn

* The <tt>WebSocket</tt> instance this event is occuring on.

*/

public void onWebsocketOpen( WebSocket conn, Handshakedata d );

/**

* Called after <tt>WebSocket#close</tt> is explicity called, or when the

* other end of the WebSocket connection is closed.

*

* @param conn

* The <tt>WebSocket</tt> instance this event is occuring on.

*/

public void onWebsocketClose( WebSocket conn, int code, String reason, boolean remote );

/**

* Called if an exception worth noting occurred.

* If an error causes the connection to fail onClose will be called additionally afterwards.

*

* @param ex

* The exception that occurred. <br>

* Might be null if the exception is not related to any specific connection. For example if the server port could not be bound.

*/

public void onWebsocketError( WebSocket conn, Exception ex );

/**

* Called a ping frame has been received.

* This method must send a corresponding pong by itself.

*

* @param f

* The ping frame. Control frames may contain payload.

*/

public void onWebsocketPing( WebSocket conn, Framedata f );

/**

* Called when a pong frame is received.

**/

public void onWebsocketPong( WebSocket conn, Framedata f );

/**

* Gets the XML string that should be returned if a client requests a Flash

* security policy.

*/

public String getFlashPolicy( WebSocket conn );

/** This method is used to inform the selector thread that there is data queued to be written to the socket. */

public void onWriteDemand( WebSocket conn );

}