Source Code Cross Referenced for ServerHelper.java in  » 6.0-JDK-Modules » java-3d » com » db » client » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » java 3d » com.db.client 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2001 Silvere Martin-Michiellot All Rights Reserved.
003:         *
004:         * Silvere Martin-Michiellot grants you ("Licensee") a non-exclusive,
005:         * royalty free, license to use, modify and redistribute this
006:         * software in source and binary code form,
007:         * provided that i) this copyright notice and license appear on all copies of
008:         * the software; and ii) Licensee does not utilize the software in a manner
009:         * which is disparaging to Silvere Martin-Michiellot.
010:         *
011:         * This software is provided "AS IS," without a warranty of any kind. ALL
012:         * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
013:         * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
014:         * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. Silvere Martin-Michiellot
015:         * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES
016:         * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
017:         * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL
018:         * Silvere Martin-Michiellot OR ITS LICENSORS BE LIABLE
019:         * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
020:         * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
021:         * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
022:         * OR INABILITY TO USE SOFTWARE, EVEN IF Silvere Martin-Michiellot HAS BEEN
023:         * ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
024:         *
025:         * This software is not designed or intended for use in on-line control of
026:         * aircraft, air traffic, aircraft navigation or aircraft communications; or in
027:         * the design, construction, operation or maintenance of any nuclear
028:         * facility. Licensee represents and warrants that it will not use or
029:         * redistribute the Software for such purposes.
030:         *
031:         * @Author: Silvere Martin-Michiellot
032:         *
033:         */
034:
035:        package com.db.client;
036:
037:        /**
038:         * This class provides methods to help the search for a server. It uses a socket to connect to some well known UniverseServerHelper without authentification to get some information on Gates and WorldSpots.
039:         */
040:
041:        import java.io.*;
042:        import java.net.*;
043:        import java.util.HashSet;
044:
045:        import com.db.net.*;
046:        import com.db.server.Gate;
047:
048:        public class ServerHelper {
049:
050:            private InetAddress localIP;
051:            private int localPort;
052:
053:            public ServerHelper(InetAddress localIP, int localPort) {
054:
055:                this .localIP = localIP;
056:                this .localPort = localPort;
057:
058:            }
059:
060:            //uses a predefined INetAddress to get access to a list of Virtual Worlds
061:            public final Gate getWellKnownServer() {
062:
063:                Gate gate;
064:                final InetAddress inetAddress;
065:                final int port;
066:
067:                // WARNING there should be the definitive hardcoded address of the Digital Biosphere main server (only a relay in fact)
068:                try {
069:
070:                    inetAddress = InetAddress.getByName("129.192.0.0");
071:
072:                    port = 1417;
073:                    gate = new Gate(inetAddress, port);
074:
075:                } catch (UnknownHostException unknownHostException) {
076:
077:                    gate = null;
078:
079:                }
080:
081:                return gate;
082:
083:            }
084:
085:            //using a UniverseServer and querying its gates
086:            //returns null or throws an IO error if this is not a UniverseServer address
087:            //use this.getWellKnownServer() as argument to get a big starting list
088:            //returns a HashSet of Gates
089:            public HashSet getGates(Gate gate) {
090:
091:                HashSet hashSet;
092:
093:                Socket socket;
094:                ObjectOutputStream objectOutputStream;
095:                ObjectInputStream objectInputStream;
096:
097:                ControlRequest controlRequest;
098:                ControlReply controlReply;
099:
100:                try {
101:
102:                    socket = new Socket(gate.getIP(), gate.getPort(),
103:                            this .localIP, this .localPort);
104:
105:                    objectInputStream = new ObjectInputStream(socket
106:                            .getInputStream());
107:                    objectOutputStream = new ObjectOutputStream(socket
108:                            .getOutputStream());
109:
110:                    controlRequest = new ControlRequest(ControlRequest.GATES);
111:                    // send request
112:                    objectOutputStream.writeObject(controlRequest);
113:
114:                    // read response
115:                    try {
116:
117:                        controlReply = (ControlReply) objectInputStream
118:                                .readObject();
119:
120:                        if (controlReply.getReplyKind() != ControlReply.REFUSED) {
121:
122:                            //build the string
123:                            hashSet = (HashSet) controlReply.getObjectValue();
124:
125:                        } else {
126:
127:                            hashSet = new HashSet();
128:
129:                        }
130:
131:                    } catch (ClassNotFoundException classNotFoundException) {
132:
133:                        hashSet = new HashSet();
134:
135:                    }
136:
137:                    objectOutputStream.flush();
138:                    objectInputStream.close();
139:                    objectOutputStream.close();
140:
141:                    socket.close();
142:
143:                }
144:
145:                catch (IOException iOException) {
146:
147:                    hashSet = new HashSet();
148:
149:                }
150:
151:                return hashSet;
152:
153:            }
154:
155:            public boolean isMulticastServer(Gate gate) {
156:
157:                return gate.getIP().isMulticastAddress();
158:
159:            }
160:
161:            //using a UniverseServer and querying its local and remote world spots
162:            //local and remote servers are queried together since
163:            //returns null or throws an IO error if this is not a UniverseServer address
164:            //returns a HashSet of WorldSpotBasicInformation
165:            public HashSet getWorldSpots(Gate gate) {
166:
167:                HashSet hashSet1;
168:                HashSet hashSet2;
169:
170:                Socket socket;
171:                ObjectOutputStream objectOutputStream;
172:                ObjectInputStream objectInputStream;
173:
174:                ControlRequest controlRequest1;
175:                ControlRequest controlRequest2;
176:                ControlReply controlReply1;
177:                ControlReply controlReply2;
178:
179:                try {
180:
181:                    socket = new Socket(gate.getIP(), gate.getPort(),
182:                            this .localIP, this .localPort);
183:
184:                    objectInputStream = new ObjectInputStream(socket
185:                            .getInputStream());
186:                    objectOutputStream = new ObjectOutputStream(socket
187:                            .getOutputStream());
188:
189:                    controlRequest1 = new ControlRequest(
190:                            ControlRequest.LOCALWORLDSPOTS);
191:                    controlRequest2 = new ControlRequest(
192:                            ControlRequest.REMOTEWORLDSPOTS);
193:                    // send request
194:                    objectOutputStream.writeObject(controlRequest1);
195:                    objectOutputStream.writeObject(controlRequest2);
196:                    // read response
197:                    try {
198:
199:                        controlReply1 = (ControlReply) objectInputStream
200:                                .readObject();
201:                        controlReply2 = (ControlReply) objectInputStream
202:                                .readObject();
203:
204:                        if ((controlReply1.getReplyKind() != ControlReply.REFUSED)
205:                                || (controlReply2.getReplyKind() != ControlReply.REFUSED)) {
206:
207:                            //build the string
208:                            hashSet1 = (HashSet) controlReply1.getObjectValue();
209:                            hashSet2 = (HashSet) controlReply2.getObjectValue();
210:
211:                            hashSet1.addAll(hashSet2);
212:
213:                        } else {
214:
215:                            hashSet1 = new HashSet();
216:
217:                        }
218:
219:                    } catch (ClassNotFoundException classNotFoundException) {
220:
221:                        hashSet1 = new HashSet();
222:
223:                    }
224:
225:                    objectOutputStream.flush();
226:                    objectInputStream.close();
227:                    objectOutputStream.close();
228:
229:                    socket.close();
230:
231:                }
232:
233:                catch (IOException iOException) {
234:
235:                    hashSet1 = new HashSet();
236:
237:                }
238:
239:                return hashSet1;
240:
241:            }
242:
243:        }
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