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package org.skycastle.server.hardcoded;
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import com.sun.sgs.app.*;
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import java.io.Serializable;
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import java.util.HashMap;
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import java.util.Properties;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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* The Skycastle Server, running inside Darkstar. Recieves events when the server is started the first time,
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* and when a client logs in.
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* This also implements some features of a chat server right now, which means maintaining the list of users
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* for the general chat.
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* 1) Channels are probably not the right way to do implement a chat, since they are essentially a method for
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* peer-to-peer communication, not message dispatching. It is not possible to enforce any state since clients
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* are free to post arbitrary messages on the channel which are then received by all other clients. There is
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* no possibility for the server to filter out bogus messages.
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* 2) Chat functionality should be handled by a dedicated service, not the server listener, which is the point
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* where new connections to the game in general are accepted. Chat is (if at all) just one of the services
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* offered by the Skycastle server.
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* 3) Implement a proper chat protocol, or even better, use idioms that will remain valid as development on
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* other game features progresses.
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public class SkycastleServerListener
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implements Serializable, AppListener
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//======================================================================
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* The name of the general chat channel: '{@value #GENERAL_CHAT}'
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public static final String GENERAL_CHAT = "General";
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//======================================================================
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* The version of the serialized form of this class.
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private static final long serialVersionUID = 1L;
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* The {@link Logger} for this class.
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private static final Logger logger =
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Logger.getLogger( SkycastleServerListener.class.getName() );
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* Map that associates a session ID with a nickname.
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protected final Map<ClientSessionId, String> nicknamesById =
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new HashMap<ClientSessionId, String>();
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//======================================================================
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//----------------------------------------------------------------------
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// AppListener Implementation
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* Creates the general chat channel. Channels persist across server restarts, so they only need to be
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* created here in {@code initialize}.
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public void initialize( Properties props )
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final ChannelManager channelManager = AppContext.getChannelManager();
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channelManager.createChannel( GENERAL_CHAT, null, Delivery.RELIABLE );
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* Returns a {@link SkycastleClientSessionListener} for the logged-in session.
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public SkycastleClientSessionListener loggedIn( ClientSession session )
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logger.log( Level.INFO, "User {0} has logged in", session.getName() );
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nicknamesById.put( session.getSessionId(), session.getName() );
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return new SkycastleClientSessionListener( session, this );
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* Get a set of nicknames of currently connected users keyed by session ID.
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* @return Set of nicknames.
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public Set<Map.Entry<ClientSessionId, String>> getConnectedUsers()
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return nicknamesById.entrySet();
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* Remove the user with the specified session ID from the nickname list.
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* @param sessionId session ID of the user to be removed
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public void removeUser( ClientSessionId sessionId )
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nicknamesById.remove( sessionId );
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modules/server/src/main/java/org/skycastle/server/hardcoded/SkycastleServerListener.java
