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

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/* -*- 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;

}

/**

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

* into any trouble.

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];

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 · sailuo/processing · GitHub

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