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SingleInstance.java
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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
Part of the Processing project - http://processing.org
Copyright (c) 2012-14 The Processing Foundation
Copyright (c) 2011-12 Ben Fry and Casey Reas
This program 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.
This program 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, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package processing.app;
import java.awt.EventQueue;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import processing.core.PApplet;
/**
* Class that handles a small server that prevents multiple instances of
* Processing from running simultaneously. If there's already an instance
* running, it'll handle opening a new empty sketch, or any files that had
* been passed in on the command line.
*/
public class SingleInstance {
static final String SERVER_PORT = "instance_server.port";
static final String SERVER_KEY = "instance_server.key";
/**
* Returns true if there's an instance of Processing already running.
* Will not return true unless this code was able to successfully
* contact the already running instance to have it launch sketches.
* @return true if successfully launched on the other instance
*/
static boolean alreadyRunning(String[] args) {
return Preferences.get(SERVER_PORT) != null && sendArguments(args);
}
/**
* Disable briefly for Processing to restart itself.
*/
static public void clearRunning() {
Preferences.unset(SERVER_PORT);
Preferences.save();
}
static void startServer(final Base base) {
try {
Messages.log("Opening SingleInstance socket");
final ServerSocket ss =
new ServerSocket(0, 0, InetAddress.getLoopbackAddress());
Preferences.set(SERVER_PORT, "" + ss.getLocalPort());
final String key = "" + Math.random();
Preferences.set(SERVER_KEY, key);
Preferences.save();
Messages.log("Starting SingleInstance thread");
new Thread(new Runnable() {
public void run() {
while (true) {
try {
Socket s = ss.accept(); // blocks (sleeps) until connection
final BufferedReader reader = PApplet.createReader(s.getInputStream());
String receivedKey = reader.readLine();
Messages.log(this, "key is " + key + ", received is " + receivedKey);
if (key.equals(receivedKey)) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Messages.log(this, "about to read line");
String path = reader.readLine();
if (path == null) {
// Because an attempt was made to launch the PDE again,
// throw the user a bone by at least opening a new
// Untitled window for them.
Messages.log(this, "opening new empty sketch");
// platform.base.handleNew();
base.handleNew();
} else {
// loop through the sketches that were passed in
do {
Messages.log(this, "calling open with " + path);
// platform.base.handleOpen(filename);
base.handleOpen(path);
path = reader.readLine();
} while (path != null);
}
} catch (IOException e) {
e.printStackTrace();
}
}
});
} else {
Messages.log(this, "keys do not match");
}
// }
} catch (IOException e) {
Messages.err("SingleInstance error while listening", e);
}
}
}
}, "SingleInstance Server").start();
} catch (IOException e) {
Messages.err("Could not create single instance server.", e);
}
}
static boolean sendArguments(String[] args) { //, long timeout) {
try {
Messages.log("Checking to see if Processing is already running");
int port = Preferences.getInteger(SERVER_PORT);
String key = Preferences.get(SERVER_KEY);
Socket socket = null;
try {
socket = new Socket(InetAddress.getLoopbackAddress(), port);
} catch (Exception ignored) { }
if (socket != null) {
Messages.log("Processing is already running, sending command line");
PrintWriter writer = PApplet.createWriter(socket.getOutputStream());
writer.println(key);
for (String arg : args) {
writer.println(arg);
}
writer.flush();
writer.close();
return true;
}
} catch (IOException e) {
Messages.err("Error sending commands to other instance", e);
}
Messages.log("Processing is not already running (or could not connect)");
return false;
}
}