Pipes

Question

Hi everyone,
here is where i am stuck in:
after reading the article i have a couple of questions:
how can the command mkfifo in java be implemented?
Besides, what i have done is as follows:
i have an app which is using the runtime to create another process in order to receive all the messages from some libraries. For the moment it is receiving all the messages and copying them into a file (this part works perfectly)
<Master Code>
FileOutputStream fos = new FileOutputStream("text.txt");//args[0]);
Runtime rt = Runtime.getRuntime();
//Process pipe = rt.exec("mkfifo pipe");
Process proc = rt.exec("java MainInterface");
StreamGobbler outputGobbler = new
StreamGobbler(proc.getInputStream(), "OUTPUT", fos);
// kick them off
outputGobbler.start();
<end Master Code>
<Thread which copyes into a file>
class StreamGobbler extends Thread
InputStream is;
String type;
OutputStream os;
StreamGobbler(InputStream is, String type, OutputStream redirect)
this.is = is;
this.type = type;
this.os = redirect;
public void run()
try
PrintWriter pw = null;
if (os != null)
pw = new PrintWriter(os);
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
if (pw != null)
pw.println(line);
System.out.println(type + ">" + line);
pw.flush();
if (pw != null)
pw.flush();
} catch (IOException ioe)
ioe.printStackTrace();
<End Thread which copyes into a file>
And the app called by this master program, which should show the messages incoming in the pip in a text area:
<mainInterface>
public static void main(String[] args) throws IOException{
javax.swing.SwingUtilities.invokeLater(new Runnable() {
//Here should be the pipe called
public void run() {
createAndShowGUI();
<End mainInterface>
Now the point is how can be done to write instead in a file, into a pipe which the mainInterface could access

Answer 1

Sorry for the format but i forgot how it was. Here is clearer. and as i wrote, i do not know how to create pipes which could be used inter processes.
Master code:
FileOutputStream fos = new FileOutputStream("text.txt");//args[0]);
Runtime rt = Runtime.getRuntime();
//Process pipe = rt.exec("mkfifo pipe");
Process proc = rt.exec("java MainInterface");
StreamGobbler outputGobbler = new
StreamGobbler(proc.getInputStream(), "OUTPUT", fos);
// kick them off
outputGobbler.start();Gobbler which deals with the messages
class StreamGobbler extends Thread
InputStream is;
String type;
OutputStream os;
StreamGobbler(InputStream is, String type, OutputStream redirect)
this.is = is;
this.type = type;
this.os = redirect;
public void run()
try
PrintWriter pw = null;
if (os != null)
pw = new PrintWriter(os);
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
if (pw != null)
pw.println(line);
System.out.println(type + ">" + line);
pw.flush();
if (pw != null)
pw.flush();
} catch (IOException ioe)
ioe.printStackTrace();
} mainInterface
public static void main(String[] args) throws IOException{
javax.swing.SwingUtilities.invokeLater(new Runnable() {
//Here should be the pipe called
public void run() {
createAndShowGUI();
}