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* version 2 for more details (a copy is included in the LICENSE file that
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
* @test
* @bug 6362121
* @summary Test one ScheduledThreadPoolExecutor extension scenario
* @author Martin Buchholz
*/
// based on a test kindly provided by Holger Hoffstaette <holger@wizards.de>
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Delayed;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.RunnableScheduledFuture;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
public class ScheduledTickleService {
// We get intermittent ClassCastException if greater than 1
// because of calls to compareTo
private static final int concurrency = 2;
// Record when tasks are done
public static final CountDownLatch done = new CountDownLatch(concurrency);
public static void realMain(String... args) throws InterruptedException {
// our tickle service
ScheduledExecutorService tickleService =
new ScheduledThreadPoolExecutor(concurrency) {
// We override decorateTask() to return a custom
// RunnableScheduledFuture which explicitly removes
// itself from the queue after cancellation.
protected <V> RunnableScheduledFuture<V>
decorateTask(Runnable runnable,
RunnableScheduledFuture<V> task) {
final ScheduledThreadPoolExecutor exec = this;
return new CustomRunnableScheduledFuture<V>(task) {
// delegate to wrapped task, except for:
public boolean cancel(boolean b) {
// cancel wrapped task & remove myself from the queue
return (task().cancel(b)
&& exec.remove(this));}};}};
for (int i = 0; i < concurrency; i++)
new ScheduledTickle(i, tickleService)
.setUpdateInterval(25, MILLISECONDS);
done.await();
tickleService.shutdown();
pass();
}
// our Runnable
static class ScheduledTickle implements Runnable {
public volatile int failures = 0;
// my tickle service
private final ScheduledExecutorService service;
// remember my own scheduled ticket
private ScheduledFuture ticket = null;
// remember the number of times I've been tickled
private int numTickled = 0;
// my private name
private final String name;
public ScheduledTickle(int i, ScheduledExecutorService service) {
super();
this.name = "Tickler-"+i;
this.service = service;
}
// set my tickle interval; 0 to disable further tickling.
public synchronized void setUpdateInterval(long interval,
TimeUnit unit) {
// cancel & remove previously created ticket
if (ticket != null) {
ticket.cancel(false);
ticket = null;
}
if (interval > 0 && ! service.isShutdown()) {
// requeue with new interval
ticket = service.scheduleAtFixedRate(this, interval,
interval, unit);
}
}
public synchronized void run() {
try {
check(numTickled < 6);
numTickled++;
System.out.println(name + ": Run " + numTickled);
// tickle 3 times and then slow down
if (numTickled == 3) {
System.out.println(name + ": slower please!");
this.setUpdateInterval(100, MILLISECONDS);
}
// ..but only 5 times max.
else if (numTickled == 5) {
System.out.println(name + ": OK that's enough.");
this.setUpdateInterval(0, MILLISECONDS);
ScheduledTickleService.done.countDown();
}
} catch (Throwable t) { unexpected(t); }
}
}
// This is just a generic wrapper to make up for the private ScheduledFutureTask
static class CustomRunnableScheduledFuture<V>
implements RunnableScheduledFuture<V> {
// the wrapped future
private RunnableScheduledFuture<V> task;
public CustomRunnableScheduledFuture(RunnableScheduledFuture<V> task) {
super();
this.task = task;
}
public RunnableScheduledFuture<V> task() { return task; }
// Forwarding methods
public boolean isPeriodic() { return task.isPeriodic(); }
public boolean isCancelled() { return task.isCancelled(); }
public boolean isDone() { return task.isDone(); }
public boolean cancel(boolean b) { return task.cancel(b); }
public long getDelay(TimeUnit unit) { return task.getDelay(unit); }
public void run() { task.run(); }
public V get()
throws InterruptedException, ExecutionException {
return task.get();
}
public V get(long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
return task.get(timeout, unit);
}
public int compareTo(Delayed other) {
if (this == other)
return 0;
else if (other instanceof CustomRunnableScheduledFuture)
return task.compareTo(((CustomRunnableScheduledFuture)other).task());
else
return task.compareTo(other);
}
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0, failed = 0;
static void pass() {passed++;}
static void fail() {failed++; Thread.dumpStack();}
static void fail(String msg) {System.out.println(msg); fail();}
static void unexpected(Throwable t) {failed++; t.printStackTrace();}
static void check(boolean cond) {if (cond) pass(); else fail();}
static void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
try {realMain(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}