processing/java/libraries/net/src/processing/net/Server.java at master · kashank/processing · GitHub

Repository navigation

History

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */

Server - basic network server implementation

Part of the Processing project - http://processing.org

The previous version of this code was developed by Hernando Barragan

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library 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

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General

Public License along with this library; if not, write to the

Free Software Foundation, Inc., 59 Temple Place, Suite 330,

Boston, MA 02111-1307 USA

package processing.net;

import processing.core.*;

import java.io.*;

import java.lang.reflect.*;

import java.net.*;

/**

* ( begin auto-generated from Server.xml )

* A server sends and receives data to and from its associated clients

* (other programs connected to it). When a server is started, it begins

* listening for connections on the port specified by the <b>port</b>

* parameter. Computers have many ports for transferring data and some are

* commonly used so be sure to not select one of these. For example, web

* servers usually use port 80 and POP mail uses port 110.

* ( end auto-generated )

* @webref net

* @usage application

* @brief The server class is used to create server objects which send and receives data to and from its associated clients (other programs connected to it).

* @instanceName server any variable of type Server

public class Server implements Runnable {

PApplet parent;

Method serverEventMethod;

Thread thread;

ServerSocket server;

int port;

/** Number of clients currently connected. */

public int clientCount;

/** Array of client objects, useful length is determined by clientCount. */

public Client[] clients;

/**

* @param parent typically use "this"

* @param port port used to transfer data

public Server(PApplet parent, int port) {

this(parent, port, null);

}

/**

* @param parent typically use "this"

* @param port port used to transfer data

* @param host when multiple NICs are in use, the ip (or name) to bind from

public Server(PApplet parent, int port, String host) {

this.parent = parent;

this.port = port;

try {

if (host == null) {

server = new ServerSocket(this.port);

} else {

server = new ServerSocket(this.port, 10, InetAddress.getByName(host));

}

//clients = new Vector();

clients = new Client[10];

thread = new Thread(this);

thread.start();

parent.registerMethod("dispose", this);

// reflection to check whether host applet has a call for

// public void serverEvent(Server s, Client c);

// which is called when a new guy connects

try {

serverEventMethod =

parent.getClass().getMethod("serverEvent",

new Class[] { Server.class,

Client.class });

} catch (Exception e) {

// no such method, or an error.. which is fine, just ignore

}

} catch (IOException e) {

//e.printStackTrace();

thread = null;

throw new RuntimeException(e);

//errorMessage("<init>", e);

}

/**

* ( begin auto-generated from Server_disconnect.xml )

* Disconnect a particular client.

* ( end auto-generated )

* @brief Disconnect a particular client.

* @webref server:server

* @param client the client to disconnect

public void disconnect(Client client) {

client.stop();

int index = clientIndex(client);

if (index != -1) {

removeIndex(index);

}

protected void removeIndex(int index) {

clientCount--;

// shift down the remaining clients

for (int i = index; i < clientCount; i++) {

clients[i] = clients[i+1];

}

// mark last empty var for garbage collection

clients[clientCount] = null;

}

protected void disconnectAll() {

synchronized (clients) {

for (int i = 0; i < clientCount; i++) {

try {

clients[i].stop();

} catch (Exception e) {

// ignore

}

clients[i] = null;

}

clientCount = 0;

}

protected void addClient(Client client) {

if (clientCount == clients.length) {

clients = (Client[]) PApplet.expand(clients);

}

clients[clientCount++] = client;

}

protected int clientIndex(Client client) {

for (int i = 0; i < clientCount; i++) {

if (clients[i] == client) {

return i;

}

return -1;

}

/**

* ( begin auto-generated from Server_active.xml )

* Returns true if this server is still active and hasn't run

* into any trouble.

* ( end auto-generated )

* @webref server:server

* @brief Return true if this server is still active.

public boolean active() {

return thread != null;

}

static public String ip() {

try {

return InetAddress.getLocalHost().getHostAddress();

} catch (UnknownHostException e) {

e.printStackTrace();

return null;

}

// the last index used for available. can't just cycle through

// the clients in order from 0 each time, because if client 0 won't

// shut up, then the rest of the clients will never be heard from.

int lastAvailable = -1;

/**

* ( begin auto-generated from Server_available.xml )

* Returns the next client in line with a new message.

* ( end auto-generated )

* @brief Returns the next client in line with a new message.

* @webref server

* @usage application

public Client available() {

synchronized (clients) {

int index = lastAvailable + 1;

if (index >= clientCount) index = 0;

for (int i = 0; i < clientCount; i++) {

int which = (index + i) % clientCount;

Client client = clients[which];

//Check for valid client

if (!client.active()){

removeIndex(which); //Remove dead client

i--; //Don't skip the next client

//If the client has data make sure lastAvailable

//doesn't end up skipping the next client

which--;

//fall through to allow data from dead clients

//to be retreived.

}

if (client.available() > 0) {

lastAvailable = which;

return client;

}

return null;

}

/**

* ( begin auto-generated from Server_stop.xml )

* Disconnects all clients and stops the server.

* ( end auto-generated )

* <h3>Advanced</h3>

* Use this to shut down the server if you finish using it while your applet

* is still running. Otherwise, it will be automatically be shut down by the

* host PApplet using dispose(), which is identical.

* @brief Disconnects all clients and stops the server.

* @webref server

* @usage application

public void stop() {

dispose();

}

/**

* Disconnect all clients and stop the server: internal use only.

public void dispose() {

thread = null;

if (clients != null) {

disconnectAll();

clientCount = 0;

clients = null;

}

try {

if (server != null) {

server.close();

server = null;

}

} catch (IOException e) {

e.printStackTrace();

}

public void run() {

while (Thread.currentThread() == thread) {

try {

Socket socket = server.accept();

Client client = new Client(parent, socket);

synchronized (clients) {

addClient(client);

if (serverEventMethod != null) {

try {

serverEventMethod.invoke(parent, new Object[] { this, client });

} catch (Exception e) {

System.err.println("Disabling serverEvent() for port " + port);

e.printStackTrace();

serverEventMethod = null;

}

} catch (SocketException e) {

//thrown when server.close() is called and server is waiting on accept

System.err.println("Server SocketException: " + e.getMessage());

thread = null;

} catch (IOException e) {

//errorMessage("run", e);

e.printStackTrace();

thread = null;

}

try {

Thread.sleep(8);

} catch (InterruptedException ex) { }

}

/**

* ( begin auto-generated from Server_write.xml )

* Writes a value to all the connected clients. It sends bytes out from the

* Server object.

* ( end auto-generated )

* @webref server

* @brief Writes data to all connected clients

* @param data data to write

public void write(int data) { // will also cover char

int index = 0;

while (index < clientCount) {

if (clients[index].active()) {

clients[index].write(data);

index++;

} else {

removeIndex(index);

}

public void write(byte data[]) {

int index = 0;

while (index < clientCount) {

if (clients[index].active()) {

clients[index].write(data);

index++;

} else {

removeIndex(index);

}

public void write(String data) {

int index = 0;

while (index < clientCount) {

if (clients[index].active()) {

clients[index].write(data);

index++;

} else {

removeIndex(index);

}

processing/java/libraries/net/src/processing/net/Server.java at master · kashank/processing · GitHub

Repository navigation

Expand file tree

Breadcrumbs

Server.java

Latest commit

History

Breadcrumbs

Server.java

File metadata and controls