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//: concurrency/Interrupting.java

package concurrency; /* Added by Eclipse.py */

// Interrupting a blocked thread.

import java.util.concurrent.*;

import java.io.*;

import static net.mindview.util.Print.*;

class SleepBlocked implements Runnable {

public void run() {

try {

TimeUnit.SECONDS.sleep(100);

} catch(InterruptedException e) {

print("InterruptedException");

}

print("Exiting SleepBlocked.run()");

}

}

class IOBlocked implements Runnable {

private InputStream in;

public IOBlocked(InputStream is) { in = is; }

public void run() {

try {

print("Waiting for read():");

in.read();

} catch(IOException e) {

if(Thread.currentThread().isInterrupted()) {

print("Interrupted from blocked I/O");

} else {

throw new RuntimeException(e);

}

}

print("Exiting IOBlocked.run()");

}

}

class SynchronizedBlocked implements Runnable {

public synchronized void f() {

while(true) // Never releases lock

Thread.yield();

}

public SynchronizedBlocked() {

new Thread() {

public void run() {

f(); // Lock acquired by this thread

}

}.start();

}

public void run() {

print("Trying to call f()");

f();

print("Exiting SynchronizedBlocked.run()");

}

}

public class Interrupting {

private static ExecutorService exec =

Executors.newCachedThreadPool();

static void test(Runnable r) throws InterruptedException{

Future<?> f = exec.submit(r);

TimeUnit.MILLISECONDS.sleep(100);

print("Interrupting " + r.getClass().getName());

f.cancel(true); // Interrupts if running

print("Interrupt sent to " + r.getClass().getName());

}

public static void main(String[] args) throws Exception {

test(new SleepBlocked());

test(new IOBlocked(System.in));

test(new SynchronizedBlocked());

TimeUnit.SECONDS.sleep(3);

print("Aborting with System.exit(0)");

System.exit(0); // ... since last 2 interrupts failed

}

} /* Output: (95% match)

Interrupting SleepBlocked

InterruptedException

Exiting SleepBlocked.run()

Interrupt sent to SleepBlocked

Waiting for read():

Interrupting IOBlocked

Interrupt sent to IOBlocked

Trying to call f()

Interrupting SynchronizedBlocked

Interrupt sent to SynchronizedBlocked

Aborting with System.exit(0)

*///:~