/*

 * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.nio.channels.AsynchronousChannelGroup;

import java.util.concurrent.*;

/**

 * Test that arbitrary tasks can be submitted to a channel group's thread pool.

 */

public class AsExecutor {

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

        // create channel groups

        ThreadFactory factory = new PrivilegedThreadFactory();

        AsynchronousChannelGroup group1 = AsynchronousChannelGroup

            .withFixedThreadPool(5, factory);

        AsynchronousChannelGroup group2 = AsynchronousChannelGroup

            .withCachedThreadPool(Executors.newCachedThreadPool(factory), 0);

        try {

            // execute simple tasks

            testSimpleTask(group1);

            testSimpleTask(group2);

            // install security manager and test again

            System.setSecurityManager( new SecurityManager() );

            testSimpleTask(group1);

            testSimpleTask(group2);

            // attempt to execute tasks that run with only frames from boot

            // class loader on the stack.

            testAttackingTask(group1);

            testAttackingTask(group2);

        } finally {

            group1.shutdown();

            group2.shutdown();

        }

    }

    static void testSimpleTask(AsynchronousChannelGroup group) throws Exception {

        Executor executor = (Executor)group;

        final CountDownLatch latch = new CountDownLatch(1);

        executor.execute(new Runnable() {

            public void run() {

                latch.countDown();

            }

        });

        latch.await();

    }

    static void testAttackingTask(AsynchronousChannelGroup group) throws Exception {

        Executor executor = (Executor)group;

        Attack task = new Attack();

        executor.execute(task);

        task.waitUntilDone();

        if (!task.failedDueToSecurityException())

            throw new RuntimeException("SecurityException expected");

    }

}