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processing/app/src/processing/app/SingleInstance.java at master · dimr/processing · GitHub
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processing
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app
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SingleInstance.java
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processing
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app
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src
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processing
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app
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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.
* @param filename Path to the PDE file that was opened, null if double-clicked
* @return true if successfully launched on the other instance
*/
static
boolean
alreadyRunning
(
String
[]
args
) {
return
Preferences
.
get
(
SERVER_PORT
) !=
null
&&
sendArguments
(
args
);
}
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
.
loge
(
"SingleInstance error while listening"
,
e
);
}
}
}
},
"SingleInstance Server"
).
start
();
}
catch
(
IOException
e
) {
Messages
.
loge
(
"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
.
loge
(
"Error sending commands to other instance"
,
e
);
}
Messages
.
log
(
"Processing is not already running (or could not connect)"
);
return
false
;
}
}
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