附录A：SwordWorld例子代码
Sword World
/*
* Copyright 2007-2009 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.sun.sgs.tutorial.server.swordworld;
import java.io.Serializable;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.sgs.app.AppContext;
import com.sun.sgs.app.AppListener;
import com.sun.sgs.app.ClientSession;
import com.sun.sgs.app.ClientSessionListener;
import com.sun.sgs.app.DataManager;
import com.sun.sgs.app.ManagedReference;
/**
* A tiny sample MUD application for the Project Darkstar Server.
*
*
* There is a Room. In the Room there is a Sword
*/
public class SwordWorld implements Serializable, AppListener {
/** The version of the serialized form of this class. */
private static final long serialVersionUID = 1L;
/** The {@link Logger} for this class. */
private static final Logger logger = Logger.getLogger(SwordWorld.class
.getName());
/** A reference to the one-and-only {@linkplain SwordWorldRoom room}. */
private ManagedReference roomRef = null;
/**
* {@inheritDoc}
*
*
* Creates the world within the MUD.
*/
public void initialize(Properties props) {
logger.info("Initializing SwordWorld");
// Create the Room
SwordWorldRoom room = new SwordWorldRoom("Plain Room",
"a nondescript room");
// Create the Sword
SwordWorldObject sword = new SwordWorldObject("Shiny Sword",
"a shiny sword.");
// Put the Sword to the Room
room.addItem(sword);
// Keep a reference to the Room
setRoom(room);
logger.info("SwordWorld Initialized");
}
/**
* Gets the SwordWorld's One True Room.
*
*
* @return the room for this {@code SwordWorld}
*/
public SwordWorldRoom getRoom() {
if (roomRef == null)
return null;
return roomRef.get();
}
/**
* Sets the SwordWorld's One True Room to the given room.
*
*
* @param room
* the room to set
*/
public void setRoom(SwordWorldRoom room) {
DataManager dataManager = AppContext.getDataManager();
if (room == null) {
roomRef = null;
return;
}
roomRef = dataManager.createReference(room);
}
/**
* {@inheritDoc}
*
*
* Obtains the {@linkplain SwordWorldPlayer player} for this
* {@linkplain ClientSession session}'s user, and puts the player into the
* One True Room for this {@code SwordWorld}.
*/
public ClientSessionListener loggedIn(ClientSession session) {
logger.log(Level.INFO, "SwordWorld Client login: {0}", session
.getName());
// Delegate to a factory method on SwordWorldPlayer,
// since player management really belongs in that class.
SwordWorldPlayer player = SwordWorldPlayer.loggedIn(session);
// Put player in room
player.enter(getRoom());
// return player object as listener to this client session
return player;
}
}
* Copyright 2007-2009 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.sun.sgs.tutorial.server.swordworld;
import java.io.Serializable;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.sgs.app.AppContext;
import com.sun.sgs.app.AppListener;
import com.sun.sgs.app.ClientSession;
import com.sun.sgs.app.ClientSessionListener;
import com.sun.sgs.app.DataManager;
import com.sun.sgs.app.ManagedReference;
/**
* A tiny sample MUD application for the Project Darkstar Server.
*
*
* There is a Room. In the Room there is a Sword
*/
public class SwordWorld implements Serializable, AppListener {
/** The version of the serialized form of this class. */
private static final long serialVersionUID = 1L;
/** The {@link Logger} for this class. */
private static final Logger logger = Logger.getLogger(SwordWorld.class
.getName());
/** A reference to the one-and-only {@linkplain SwordWorldRoom room}. */
private ManagedReference roomRef = null;
/**
* {@inheritDoc}
*
*
* Creates the world within the MUD.
*/
public void initialize(Properties props) {
logger.info("Initializing SwordWorld");
// Create the Room
SwordWorldRoom room = new SwordWorldRoom("Plain Room",
"a nondescript room");
// Create the Sword
SwordWorldObject sword = new SwordWorldObject("Shiny Sword",
"a shiny sword.");
// Put the Sword to the Room
room.addItem(sword);
// Keep a reference to the Room
setRoom(room);
logger.info("SwordWorld Initialized");
}
/**
* Gets the SwordWorld's One True Room.
*
*
* @return the room for this {@code SwordWorld}
*/
public SwordWorldRoom getRoom() {
if (roomRef == null)
return null;
return roomRef.get();
}
/**
* Sets the SwordWorld's One True Room to the given room.
*
*
* @param room
* the room to set
*/
public void setRoom(SwordWorldRoom room) {
DataManager dataManager = AppContext.getDataManager();
if (room == null) {
roomRef = null;
return;
}
roomRef = dataManager.createReference(room);
}
/**
* {@inheritDoc}
*
*
* Obtains the {@linkplain SwordWorldPlayer player} for this
* {@linkplain ClientSession session}'s user, and puts the player into the
* One True Room for this {@code SwordWorld}.
*/
public ClientSessionListener loggedIn(ClientSession session) {
logger.log(Level.INFO, "SwordWorld Client login: {0}", session
.getName());
// Delegate to a factory method on SwordWorldPlayer,
// since player management really belongs in that class.
SwordWorldPlayer player = SwordWorldPlayer.loggedIn(session);
// Put player in room
player.enter(getRoom());
// return player object as listener to this client session
return player;
}
}
SwordWorldObject
/*
* Copyright 2007-2009 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.sun.sgs.tutorial.server.swordworld;
import java.io.Serializable;
import com.sun.sgs.app.AppContext;
import com.sun.sgs.app.ManagedObject;
/**
* A {@code ManagedObject} that has a name and a description.
*/
public class SwordWorldObject implements Serializable, ManagedObject {
/** The version of the serialized form of this class. */
private static final long serialVersionUID = 1L;
/** The name of this object. */
private String name;
/** The description of this object. */
private String description;
/**
* Creates a new {@code SwordWorldObject} with the given {@code name} and
* {@code description}.
*
* @param name
* the name of this object
* @param description
* the description of this object
*/
public SwordWorldObject(String name, String description) {
this.name = name;
this.description = description;
}
/**
* Sets the name of this object.
*
* @param name
* the name of this object
*/
public void setName(String name) {
AppContext.getDataManager().markForUpdate(this);
this.name = name;
}
/**
* Returns the name of this object.
*
* @return the name of this object
*/
public String getName() {
return name;
}
/**
* Sets the description of this object.
*
* @param description
* the description of this object
*/
public void setDescription(String description) {
AppContext.getDataManager().markForUpdate(this);
this.description = description;
}
/**
* Returns the description of this object.
*
* @return the description of this object
*/
public String getDescription() {
return description;
}
/** {@inheritDoc} */
@Override
public String toString() {
return getName();
}
}
* Copyright 2007-2009 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.sun.sgs.tutorial.server.swordworld;
import java.io.Serializable;
import com.sun.sgs.app.AppContext;
import com.sun.sgs.app.ManagedObject;
/**
* A {@code ManagedObject} that has a name and a description.
*/
public class SwordWorldObject implements Serializable, ManagedObject {
/** The version of the serialized form of this class. */
private static final long serialVersionUID = 1L;
/** The name of this object. */
private String name;
/** The description of this object. */
private String description;
/**
* Creates a new {@code SwordWorldObject} with the given {@code name} and
* {@code description}.
*
* @param name
* the name of this object
* @param description
* the description of this object
*/
public SwordWorldObject(String name, String description) {
this.name = name;
this.description = description;
}
/**
* Sets the name of this object.
*
* @param name
* the name of this object
*/
public void setName(String name) {
AppContext.getDataManager().markForUpdate(this);
this.name = name;
}
/**
* Returns the name of this object.
*
* @return the name of this object
*/
public String getName() {
return name;
}
/**
* Sets the description of this object.
*
* @param description
* the description of this object
*/
public void setDescription(String description) {
AppContext.getDataManager().markForUpdate(this);
this.description = description;
}
/**
* Returns the description of this object.
*
* @return the description of this object
*/
public String getDescription() {
return description;
}
/** {@inheritDoc} */
@Override
public String toString() {
return getName();
}
}
SwordWorldRoom
/*
* Copyright 2007-2009 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.sun.sgs.tutorial.server.swordworld;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.sgs.app.AppContext;
import com.sun.sgs.app.DataManager;
import com.sun.sgs.app.ManagedReference;
/**
* Represents a room in the {@link SwordWorld} example MUD.
*/
public class SwordWorldRoom extends SwordWorldObject
{
/** The version of the serialized form of this class. */
private static final long serialVersionUID = 1L;
/** The {@link Logger} for this class. */
private static final Logger logger =
Logger.getLogger(SwordWorldRoom.class.getName());
/** The set of items in this room. */
private final Set> items =
new HashSet>();
/** The set of players in this room. */
private final Set> players =
new HashSet>();
/**
* Creates a new room with the given name and description, initially empty of
* items and players.
*
* @param name
* the name of this room
* @param description
* a description of this room
*
*/
public SwordWorldRoom(String name, String description) {
super(name, description);
}
/**
* Adds an item to this room.
*
* @param item
* the item to add to this room.
* @return {@code true} if the item was added to the room
*/
public boolean addItem(SwordWorldObject item) {
logger.log(Level.INFO, "{0} placed in {1}",
new Object[] { item, this });
// NOTE: we can't directly save the item in the list, or
// we'll end up with a local copy of the item. Instead, we
// must save a ManagedReference to the item.
DataManager dataManager = AppContext.getDataManager();
dataManager.markForUpdate(this);
return items.add(dataManager.createReference(item));
}
/**
* Adds a player to this room.
*
* @param player
* the player to add
* @return {@code true} if the player was added to the room
*/
public boolean addPlayer(SwordWorldPlayer player) {
logger.log(Level.INFO, "{0} enters {1}",
new Object[] { player, this });
DataManager dataManager = AppContext.getDataManager();
dataManager.markForUpdate(this);
return players.add(dataManager.createReference(player));
}
/**
* Removes a player from this room.
*
* @param player
* the player to remove
* @return {@code true} if the player was in the room
*/
public boolean removePlayer(SwordWorldPlayer player) {
logger.log(Level.INFO, "{0} leaves {1}",
new Object[] { player, this });
DataManager dataManager = AppContext.getDataManager();
dataManager.markForUpdate(this);
return players.remove(dataManager.createReference(player));
}
/**
* Returns a description of what the given player sees in this room.
*
* @param looker
* the player looking in this room
* @return a description of what the given player sees in this room
*/
public String look(SwordWorldPlayer looker) {
logger.log(Level.INFO, "{0} looks at {1}",
new Object[] { looker, this });
StringBuilder output = new StringBuilder();
output.append("You are in ").append(getDescription()).append(".\n");
List otherPlayers = getPlayersExcluding(looker);
if (! otherPlayers.isEmpty()) {
output.append("Also in here are ");
appendPrettyList(output, otherPlayers);
output.append(".\n");
}
if (! items.isEmpty()) {
output.append("On the floor you see:\n");
for (ManagedReference itemRef : items) {
SwordWorldObject item = itemRef.get();
output.append(item.getDescription()).append('\n');
}
}
return output.toString();
}
/**
* Appends the names of the {@code SwordWorldObject}s in the list to the
* builder, separated by commas, with an "and" before the final item.
*
* @param builder
* the {@code StringBuilder} to append to
* @param list
* the list of items to format
*/
private void appendPrettyList(StringBuilder builder,
List<!--xtends SwordWorldObje--> list)
{
if (list.isEmpty()) {
return;
}
int lastIndex = list.size() - 1;
SwordWorldObject last = list.get(lastIndex);
Iterator<!--xtends SwordWorldObje--> it =
list.subList(0, lastIndex).iterator();
if (it.hasNext()) {
SwordWorldObject other = it.next();
builder.append(other.getName());
while (it.hasNext()) {
other = it.next();
builder.append(" ,");
builder.append(other.getName());
}
builder.append(" and ");
}
builder.append(last.getName());
}
/**
* Returns a list of players in this room excluding the given player.
*
* @param player
* the player to exclude
* @return the list of players
*/
private ListgetPlayersExcluding(SwordWorldPlayer player)
{
if (players.isEmpty()) {
return Collections.emptyList();
}
ArrayList otherPlayers =
new ArrayList(players.size());
for (ManagedReference playerRef : players) {
SwordWorldPlayer other = playerRef.get();
if (!player.equals(other)) {
otherPlayers.add(other);
}
}
return Collections.unmodifiableList(otherPlayers);
}
}
* Copyright 2007-2009 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.sun.sgs.tutorial.server.swordworld;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.sgs.app.AppContext;
import com.sun.sgs.app.DataManager;
import com.sun.sgs.app.ManagedReference;
/**
* Represents a room in the {@link SwordWorld} example MUD.
*/
public class SwordWorldRoom extends SwordWorldObject
{
/** The version of the serialized form of this class. */
private static final long serialVersionUID = 1L;
/** The {@link Logger} for this class. */
private static final Logger logger =
Logger.getLogger(SwordWorldRoom.class.getName());
/** The set of items in this room. */
private final Set> items =
new HashSet>();
/** The set of players in this room. */
private final Set> players =
new HashSet>();
/**
* Creates a new room with the given name and description, initially empty of
* items and players.
*
* @param name
* the name of this room
* @param description
* a description of this room
*
*/
public SwordWorldRoom(String name, String description) {
super(name, description);
}
/**
* Adds an item to this room.
*
* @param item
* the item to add to this room.
* @return {@code true} if the item was added to the room
*/
public boolean addItem(SwordWorldObject item) {
logger.log(Level.INFO, "{0} placed in {1}",
new Object[] { item, this });
// NOTE: we can't directly save the item in the list, or
// we'll end up with a local copy of the item. Instead, we
// must save a ManagedReference to the item.
DataManager dataManager = AppContext.getDataManager();
dataManager.markForUpdate(this);
return items.add(dataManager.createReference(item));
}
/**
* Adds a player to this room.
*
* @param player
* the player to add
* @return {@code true} if the player was added to the room
*/
public boolean addPlayer(SwordWorldPlayer player) {
logger.log(Level.INFO, "{0} enters {1}",
new Object[] { player, this });
DataManager dataManager = AppContext.getDataManager();
dataManager.markForUpdate(this);
return players.add(dataManager.createReference(player));
}
/**
* Removes a player from this room.
*
* @param player
* the player to remove
* @return {@code true} if the player was in the room
*/
public boolean removePlayer(SwordWorldPlayer player) {
logger.log(Level.INFO, "{0} leaves {1}",
new Object[] { player, this });
DataManager dataManager = AppContext.getDataManager();
dataManager.markForUpdate(this);
return players.remove(dataManager.createReference(player));
}
/**
* Returns a description of what the given player sees in this room.
*
* @param looker
* the player looking in this room
* @return a description of what the given player sees in this room
*/
public String look(SwordWorldPlayer looker) {
logger.log(Level.INFO, "{0} looks at {1}",
new Object[] { looker, this });
StringBuilder output = new StringBuilder();
output.append("You are in ").append(getDescription()).append(".\n");
List otherPlayers = getPlayersExcluding(looker);
if (! otherPlayers.isEmpty()) {
output.append("Also in here are ");
appendPrettyList(output, otherPlayers);
output.append(".\n");
}
if (! items.isEmpty()) {
output.append("On the floor you see:\n");
for (ManagedReference itemRef : items) {
SwordWorldObject item = itemRef.get();
output.append(item.getDescription()).append('\n');
}
}
return output.toString();
}
/**
* Appends the names of the {@code SwordWorldObject}s in the list to the
* builder, separated by commas, with an "and" before the final item.
*
* @param builder
* the {@code StringBuilder} to append to
* @param list
* the list of items to format
*/
private void appendPrettyList(StringBuilder builder,
List<!--xtends SwordWorldObje--> list)
{
if (list.isEmpty()) {
return;
}
int lastIndex = list.size() - 1;
SwordWorldObject last = list.get(lastIndex);
Iterator<!--xtends SwordWorldObje--> it =
list.subList(0, lastIndex).iterator();
if (it.hasNext()) {
SwordWorldObject other = it.next();
builder.append(other.getName());
while (it.hasNext()) {
other = it.next();
builder.append(" ,");
builder.append(other.getName());
}
builder.append(" and ");
}
builder.append(last.getName());
}
/**
* Returns a list of players in this room excluding the given player.
*
* @param player
* the player to exclude
* @return the list of players
*/
private ListgetPlayersExcluding(SwordWorldPlayer player)
{
if (players.isEmpty()) {
return Collections.emptyList();
}
ArrayList otherPlayers =
new ArrayList(players.size());
for (ManagedReference playerRef : players) {
SwordWorldPlayer other = playerRef.get();
if (!player.equals(other)) {
otherPlayers.add(other);
}
}
return Collections.unmodifiableList(otherPlayers);
}
}
SwordWorldPlayer
/*
* Copyright 2007-2009 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.sun.sgs.tutorial.server.swordworld;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.sgs.app.AppContext;
import com.sun.sgs.app.ClientSession;
import com.sun.sgs.app.ClientSessionListener;
import com.sun.sgs.app.DataManager;
import com.sun.sgs.app.ManagedReference;
import com.sun.sgs.app.NameNotBoundException;
/**
* Represents a player in the {@link SwordWorld} example MUD.
*/
public class SwordWorldPlayer extends SwordWorldObject implements
ClientSessionListener {
/** The version of the serialized form of this class. */
private static final long serialVersionUID = 1L;
/** The {@link Logger} for this class. */
private static final Logger logger = Logger
.getLogger(SwordWorldPlayer.class.getName());
/** The message encoding. */
public static final String MESSAGE_CHARSET = "UTF-8";
/** The prefix for player bindings in the {@code DataManager}. */
protected static final String PLAYER_BIND_PREFIX = "Player.";
/** The {@code ClientSession} for this player, or null if logged out. */
private ManagedReference currentSessionRef = null;
/** The {@link SwordWorldRoom} this player is in, or null if none. */
private ManagedReference currentRoomRef = null;
/**
* Find or create the player object for the given session, and mark the
* player as logged in on that session.
*
* @param session
* which session to find or create a player for
* @return a player for the given session
*/
public static SwordWorldPlayer loggedIn(ClientSession session) {
String playerBinding = PLAYER_BIND_PREFIX + session.getName();
// try to find player object, if non existent then create
DataManager dataMgr = AppContext.getDataManager();
SwordWorldPlayer player;
try {
player = (SwordWorldPlayer) dataMgr.getBinding(playerBinding);
} catch (NameNotBoundException ex) {
// this is a new player
player = new SwordWorldPlayer(playerBinding);
logger.log(Level.INFO, "New player created: {0}", player);
dataMgr.setBinding(playerBinding, player);
}
player.setSession(session);
return player;
}
/**
* Creates a new {@code SwordWorldPlayer} with the given name.
*
* @param name
* the name of this player
*/
protected SwordWorldPlayer(String name) {
super(name, "Seeker of the Sword");
}
/**
* Returns the session for this listener.
*
* @return the session for this listener
*/
protected ClientSession getSession() {
if (currentSessionRef == null) {
return null;
}
return currentSessionRef.get();
}
/**
* Mark this player as logged in on the given session.
*
* @param session
* the session this player is logged in on
*/
protected void setSession(ClientSession session) {
DataManager dataMgr = AppContext.getDataManager();
dataMgr.markForUpdate(this);
currentSessionRef = dataMgr.createReference(session);
logger.log(Level.INFO, "Set session for {0} to {1}", new Object[] {
this, session });
}
/**
* Handles a player entering a room.
*
* @param room
* the room for this player to enter
*/
public void enter(SwordWorldRoom room) {
logger.log(Level.INFO, "{0} enters {1}", new Object[] { this, room });
room.addPlayer(this);
setRoom(room);
}
/** {@inheritDoc} */
public void receivedMessage(ByteBuffer message) {
String command = decodeString(message);
logger.log(Level.INFO, "{0} received command: {1}", new Object[] {
this, command });
if (command.equalsIgnoreCase("look")) {
String reply = getRoom().look(this);
getSession().send(encodeString(reply));
} else {
logger.log(Level.WARNING, "{0} unknown command: {1}", new Object[] {
this, command });
// We could disconnect the rogue player at this point.
// currentSession.disconnect();
}
}
/** {@inheritDoc} */
public void disconnected(boolean graceful) {
setSession(null);
logger.log(Level.INFO, "Disconnected: {0}", this);
getRoom().removePlayer(this);
setRoom(null);
}
/**
* Returns the room this player is currently in, or {@code null} if this
* player is not in a room.
*
*
* @return the room this player is currently in, or {@code null}
*/
protected SwordWorldRoom getRoom() {
if (currentRoomRef == null) {
return null;
}
return currentRoomRef.get();
}
/**
* Sets the room this player is currently in. If the room given is null,
* marks the player as not in any room.
*
*
* @param room
* the room this player should be in, or {@code null}
*/
protected void setRoom(SwordWorldRoom room) {
DataManager dataManager = AppContext.getDataManager();
dataManager.markForUpdate(this);
if (room == null) {
currentRoomRef = null;
return;
}
currentRoomRef = dataManager.createReference(room);
}
/** {@inheritDoc} */
@Override
public String toString() {
StringBuilder buf = new StringBuilder(getName());
buf.append('@');
if (getSession() == null) {
buf.append("null");
} else {
buf.append(currentSessionRef.getId());
}
return buf.toString();
}
/**
* Encodes a {@code String} into a {@link ByteBuffer}.
*
* @param s
* the string to encode
* @return the {@code ByteBuffer} which encodes the given string
*/
protected static ByteBuffer encodeString(String s) {
try {
return ByteBuffer.wrap(s.getBytes(MESSAGE_CHARSET));
} catch (UnsupportedEncodingException e) {
throw new Error("Required character set " + MESSAGE_CHARSET
+ " not found", e);
}
}
/**
* Decodes a message into a {@code String}.
*
* @param message
* the message to decode
* @return the decoded string
*/
protected static String decodeString(ByteBuffer message) {
try {
byte[] bytes = new byte[message.remaining()];
message.get(bytes);
return new String(bytes, MESSAGE_CHARSET);
} catch (UnsupportedEncodingException e) {
throw new Error("Required character set " + MESSAGE_CHARSET
+ " not found", e);
}
}
}
* Copyright 2007-2009 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.sun.sgs.tutorial.server.swordworld;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.sgs.app.AppContext;
import com.sun.sgs.app.ClientSession;
import com.sun.sgs.app.ClientSessionListener;
import com.sun.sgs.app.DataManager;
import com.sun.sgs.app.ManagedReference;
import com.sun.sgs.app.NameNotBoundException;
/**
* Represents a player in the {@link SwordWorld} example MUD.
*/
public class SwordWorldPlayer extends SwordWorldObject implements
ClientSessionListener {
/** The version of the serialized form of this class. */
private static final long serialVersionUID = 1L;
/** The {@link Logger} for this class. */
private static final Logger logger = Logger
.getLogger(SwordWorldPlayer.class.getName());
/** The message encoding. */
public static final String MESSAGE_CHARSET = "UTF-8";
/** The prefix for player bindings in the {@code DataManager}. */
protected static final String PLAYER_BIND_PREFIX = "Player.";
/** The {@code ClientSession} for this player, or null if logged out. */
private ManagedReference currentSessionRef = null;
/** The {@link SwordWorldRoom} this player is in, or null if none. */
private ManagedReference currentRoomRef = null;
/**
* Find or create the player object for the given session, and mark the
* player as logged in on that session.
*
* @param session
* which session to find or create a player for
* @return a player for the given session
*/
public static SwordWorldPlayer loggedIn(ClientSession session) {
String playerBinding = PLAYER_BIND_PREFIX + session.getName();
// try to find player object, if non existent then create
DataManager dataMgr = AppContext.getDataManager();
SwordWorldPlayer player;
try {
player = (SwordWorldPlayer) dataMgr.getBinding(playerBinding);
} catch (NameNotBoundException ex) {
// this is a new player
player = new SwordWorldPlayer(playerBinding);
logger.log(Level.INFO, "New player created: {0}", player);
dataMgr.setBinding(playerBinding, player);
}
player.setSession(session);
return player;
}
/**
* Creates a new {@code SwordWorldPlayer} with the given name.
*
* @param name
* the name of this player
*/
protected SwordWorldPlayer(String name) {
super(name, "Seeker of the Sword");
}
/**
* Returns the session for this listener.
*
* @return the session for this listener
*/
protected ClientSession getSession() {
if (currentSessionRef == null) {
return null;
}
return currentSessionRef.get();
}
/**
* Mark this player as logged in on the given session.
*
* @param session
* the session this player is logged in on
*/
protected void setSession(ClientSession session) {
DataManager dataMgr = AppContext.getDataManager();
dataMgr.markForUpdate(this);
currentSessionRef = dataMgr.createReference(session);
logger.log(Level.INFO, "Set session for {0} to {1}", new Object[] {
this, session });
}
/**
* Handles a player entering a room.
*
* @param room
* the room for this player to enter
*/
public void enter(SwordWorldRoom room) {
logger.log(Level.INFO, "{0} enters {1}", new Object[] { this, room });
room.addPlayer(this);
setRoom(room);
}
/** {@inheritDoc} */
public void receivedMessage(ByteBuffer message) {
String command = decodeString(message);
logger.log(Level.INFO, "{0} received command: {1}", new Object[] {
this, command });
if (command.equalsIgnoreCase("look")) {
String reply = getRoom().look(this);
getSession().send(encodeString(reply));
} else {
logger.log(Level.WARNING, "{0} unknown command: {1}", new Object[] {
this, command });
// We could disconnect the rogue player at this point.
// currentSession.disconnect();
}
}
/** {@inheritDoc} */
public void disconnected(boolean graceful) {
setSession(null);
logger.log(Level.INFO, "Disconnected: {0}", this);
getRoom().removePlayer(this);
setRoom(null);
}
/**
* Returns the room this player is currently in, or {@code null} if this
* player is not in a room.
*
*
* @return the room this player is currently in, or {@code null}
*/
protected SwordWorldRoom getRoom() {
if (currentRoomRef == null) {
return null;
}
return currentRoomRef.get();
}
/**
* Sets the room this player is currently in. If the room given is null,
* marks the player as not in any room.
*
*
* @param room
* the room this player should be in, or {@code null}
*/
protected void setRoom(SwordWorldRoom room) {
DataManager dataManager = AppContext.getDataManager();
dataManager.markForUpdate(this);
if (room == null) {
currentRoomRef = null;
return;
}
currentRoomRef = dataManager.createReference(room);
}
/** {@inheritDoc} */
@Override
public String toString() {
StringBuilder buf = new StringBuilder(getName());
buf.append('@');
if (getSession() == null) {
buf.append("null");
} else {
buf.append(currentSessionRef.getId());
}
return buf.toString();
}
/**
* Encodes a {@code String} into a {@link ByteBuffer}.
*
* @param s
* the string to encode
* @return the {@code ByteBuffer} which encodes the given string
*/
protected static ByteBuffer encodeString(String s) {
try {
return ByteBuffer.wrap(s.getBytes(MESSAGE_CHARSET));
} catch (UnsupportedEncodingException e) {
throw new Error("Required character set " + MESSAGE_CHARSET
+ " not found", e);
}
}
/**
* Decodes a message into a {@code String}.
*
* @param message
* the message to decode
* @return the decoded string
*/
protected static String decodeString(ByteBuffer message) {
try {
byte[] bytes = new byte[message.remaining()];
message.get(bytes);
return new String(bytes, MESSAGE_CHARSET);
} catch (UnsupportedEncodingException e) {
throw new Error("Required character set " + MESSAGE_CHARSET
+ " not found", e);
}
}
}
