Question

Write a Java program that uses pipes to communicate between processes.

Answer 1

CODE

import java.io.PipedReader;

import java.io.PipedWriter;

class PipeReaderThread implements Runnable

{

PipedReader pr;

String name = null;

public PipeReaderThread(String name, PipedReader pr)

{

this.name = name;

this.pr = pr;

}

public void run()

{

try {

// continuously read data from stream and print it in console

while (true) {

char c = (char) pr.read(); // read a char

if (c != -1) { // check for -1 indicating end of file

System.out.print(c);

}

}

} catch (Exception e) {

System.out.println(" PipeThread Exception: " + e);

}

}

}

class PipeWriterThread implements Runnable

{

PipedWriter pw;

String name = null;

public PipeWriterThread(String name, PipedWriter pw) {

this.name = name;

this.pw = pw;

}

public void run() {

try {

while (true) {

// Write some data after every two seconds

pw.write("Testing data written...n");

pw.flush();

Thread.sleep(2000);

}

} catch (Exception e) {

System.out.println(" PipeThread Exception: " + e);

}

}

}

public class PipedCommunicationTest

{

public static void main(String[] args)

{

new PipedCommunicationTest();

}

public PipedCommunicationTest()

{

try

{

// Create writer and reader instances

PipedReader pr = new PipedReader();

PipedWriter pw = new PipedWriter();

// Connect the writer with reader

pw.connect(pr);

// Create one writer thread and one reader thread

Thread thread1 = new Thread(new PipeReaderThread("ReaderThread", pr));

Thread thread2 = new Thread(new PipeWriterThread("WriterThread", pw));

// start both threads

thread1.start();

thread2.start();

}

catch (Exception e)

{

System.out.println("PipeThread Exception: " + e);

}

}

}