76 lines
1.9 KiB
Java
76 lines
1.9 KiB
Java
//: concurrency/InterruptingIdiom.java
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// ©2015 MindView LLC: see Copyright.txt
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// General idiom for interrupting a task.
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// {Args: 1100}
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import java.util.concurrent.*;
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import static com.mindviewinc.util.Print.*;
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class NeedsCleanup {
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private final int id;
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public NeedsCleanup(int ident) {
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id = ident;
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print("NeedsCleanup " + id);
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}
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public void cleanup() {
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print("Cleaning up " + id);
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}
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}
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class Blocked3 implements Runnable {
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private volatile double d = 0.0;
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@Override
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public void run() {
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try {
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while(!Thread.interrupted()) {
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// point1
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NeedsCleanup n1 = new NeedsCleanup(1);
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// Start try-finally immediately after definition
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// of n1, to guarantee proper cleanup of n1:
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try {
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print("Sleeping");
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TimeUnit.SECONDS.sleep(1);
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// point2
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NeedsCleanup n2 = new NeedsCleanup(2);
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// Guarantee proper cleanup of n2:
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try {
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print("Calculating");
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// A time-consuming, non-blocking operation:
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for(int i = 1; i < 2500000; i++)
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d += (Math.PI + Math.E) / d;
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print("Finished time-consuming operation");
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} finally {
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n2.cleanup();
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}
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} finally {
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n1.cleanup();
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}
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}
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print("Exiting via while() test");
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} catch(InterruptedException e) {
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print("Exiting via InterruptedException");
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}
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}
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}
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public class InterruptingIdiom {
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public static void main(String[] args) throws Exception {
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if(args.length != 1) {
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print("usage: java InterruptingIdiom delay-in-mS");
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System.exit(1);
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}
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Thread t = new Thread(new Blocked3());
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t.start();
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TimeUnit.MILLISECONDS.sleep(new Integer(args[0]));
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t.interrupt();
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}
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} /* Output:
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NeedsCleanup 1
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Sleeping
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NeedsCleanup 2
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Calculating
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Finished time-consuming operation
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Cleaning up 2
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Cleaning up 1
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Exiting via while() test
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*///:~
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