/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
import java.util.*;
import java.util.concurrent.atomic.*;
import org.opensolaris.os.dtrace.*;

/**
 * Regression test for 6521523 aggregation drops can hang the Java
 * DTrace API.
 */
public class TestDrop {
    static final String PROGRAM =
            "fbt:genunix::entry { @[execname, pid] = count(); }";

    static AtomicLong consumerThreadID = new AtomicLong();
    static AtomicLong getAggregateThreadID = new AtomicLong();
    static AtomicBoolean done = new AtomicBoolean();
    static int seconds;

    private static void
    startTimer()
    {
        if (seconds <= 0) {
            return;
        }

        final Timer timer = new Timer();
        timer.schedule(new TimerTask() {
            public void run() {
                done.set(true);
                timer.cancel();
            }
        }, seconds * 1000L);
    }

    private static void
    sampleAggregate(Consumer consumer) throws DTraceException
    {
        while (consumer.isRunning() && !done.get()) {
            try {
                Thread.sleep(50);
            } catch (InterruptedException e) {
            }

            consumer.getAggregate(Collections. <String> emptySet());
        }
    }

    private static void
    startAggregateThread(final Consumer consumer)
    {
        Runnable aggregateSampler = new Runnable() {
            public void run() {
                Thread t = Thread.currentThread();
                getAggregateThreadID.set(t.getId());
                Throwable x = null;
                try {
                    sampleAggregate(consumer);
                } catch (Throwable e) {
                    x = e;
                }

                if (Thread.holdsLock(LocalConsumer.class)) {
                    if (x != null) {
                        x.printStackTrace();
                    }
                    System.out.println("Lock held");
                    System.exit(1);
                } else {
                    System.out.println("Lock released");
                    consumer.close(); // blocks if lock held
                }
            }
        };

        Thread t = new Thread(aggregateSampler, "Aggregate Sampler");
        t.start();
    }

    static void
    usage()
    {
        System.err.println("usage: java TestDrop [ seconds ]");
        System.exit(2);
    }

    public static void
    main(String[] args)
    {
        if (args.length == 1) {
            try {
                seconds = Integer.parseInt(args[0]);
            } catch (NumberFormatException e) {
                usage();
            }
        } else if (args.length > 1) {
            usage();
        }

        final Consumer consumer = new LocalConsumer() {
            protected Thread createThread() {
                Runnable worker = new Runnable() {
                    public void run() {
                        Thread t = Thread.currentThread();
                        consumerThreadID.set(t.getId());
                        work();
                    }
                };
                Thread t = new Thread(worker);
                return t;
            }
        };

        consumer.addConsumerListener(new ConsumerAdapter() {
            public void consumerStarted(ConsumerEvent e) {
                startAggregateThread(consumer);
                startTimer();
            }
            public void dataDropped(DropEvent e) throws ConsumerException {
                Thread t = Thread.currentThread();
                if (t.getId() == getAggregateThreadID.get()) {
                    Drop drop = e.getDrop();
                    throw new ConsumerException(drop.getDefaultMessage(),
                            drop);
                }
            }
        });

        try {
            consumer.open();
            consumer.setOption(Option.aggsize, Option.kb(1));
            consumer.setOption(Option.aggrate, Option.millis(101));
            consumer.compile(PROGRAM);
            consumer.enable();
            consumer.go(new ExceptionHandler() {
                public void handleException(Throwable e) {
                    e.printStackTrace();
                }
            });
        } catch (DTraceException e) {
            e.printStackTrace();
        }
    }
}