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/*

 * @test

 * @bug     6546089

 * @summary Basic unit test of MemoryPoolMXBean.isUsageThresholdExceeded() and

 *          MemoryPoolMXBean.isCollectionThresholdExceeded().

 * @author  Mandy Chung

 *

 * @run main ThresholdTest

 */

import java.lang.management.*;

import java.util.*;

public class ThresholdTest {

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

        List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();

        try {

            for (MemoryPoolMXBean p : pools) {

                // verify if isUsageThresholdExceeded() returns correct value

                checkUsageThreshold(p);

                // verify if isCollectionUsageThresholdExceeded() returns correct value

                checkCollectionUsageThreshold(p);

            }

        } finally {

            // restore the default

            for (MemoryPoolMXBean p : pools) {

                if (p.isUsageThresholdSupported()) {

                    p.setUsageThreshold(0);

                }

                if (p.isCollectionUsageThresholdSupported()) {

                    p.setCollectionUsageThreshold(0);

                }

            }

        }

        System.out.println("Test passed.");

    }

    private static void checkUsageThreshold(MemoryPoolMXBean p) throws Exception {

        if (!p.isUsageThresholdSupported()) {

            return;

        }

        long threshold = p.getUsageThreshold();

        if (threshold != 0) {

            // Expect the default threshold is zero (disabled)

            throw new RuntimeException("TEST FAILED: " +

                "Pool " + p.getName() +

                " has non-zero threshold (" + threshold);

        }

        // isUsageThresholdExceeded() should return false if threshold == 0

        if (p.isUsageThresholdExceeded()) {

            throw new RuntimeException("TEST FAILED: " +

                "Pool " + p.getName() +

                " isUsageThresholdExceeded() returned true" +

                " but threshold = 0");

        }

        p.setUsageThreshold(1);

        MemoryUsage u = p.getUsage();

        if (u.getUsed() >= 1) {

            if (!p.isUsageThresholdExceeded()) {

                throw new RuntimeException("TEST FAILED: " +

                    "Pool " + p.getName() +

                    " isUsageThresholdExceeded() returned false but " +

                    " threshold(" + p.getUsageThreshold() +

                    ") <= used(" + u.getUsed() + ")");

            }

        } else {

            if (p.isUsageThresholdExceeded()) {

                throw new RuntimeException("TEST FAILED: " +

                    "Pool " + p.getName() +

                    " isUsageThresholdExceeded() returned true but" +

                    " threshold(" + p.getUsageThreshold() +

                    ") > used(" + u.getUsed() + ")");

            }

        }

        // disable low memory detection and isUsageThresholdExceeded()

        // should return false

        p.setUsageThreshold(0);

        if (p.isUsageThresholdExceeded()) {

            throw new RuntimeException("TEST FAILED: " +

                "Pool " + p.getName() +

                " isUsageThresholdExceeded() returned true but threshold = 0");

        }

    }

    private static void checkCollectionUsageThreshold(MemoryPoolMXBean p) throws Exception {

        if (!p.isCollectionUsageThresholdSupported()) {

            return;

        }

        long threshold = p.getCollectionUsageThreshold();

        if (threshold != 0) {

            // Expect the default threshold is zero (disabled)

            throw new RuntimeException("TEST FAILED: " +

                "Pool " + p.getName() +

                " has non-zero threshold (" + threshold);

        }

        // isCollectionUsageThresholdExceeded() should return false if threshold == 0

        if (p.isCollectionUsageThresholdExceeded()) {

            throw new RuntimeException("TEST FAILED: " +

                "Pool " + p.getName() +

                " isCollectionUsageThresholdExceeded() returned true" +

                " but threshold = 0");

        }

        p.setCollectionUsageThreshold(1);

        MemoryUsage u = p.getCollectionUsage();

        if (u == null) {

            if (p.isCollectionUsageThresholdExceeded()) {

                throw new RuntimeException("TEST FAILED: " +

                    "Pool " + p.getName() +

                    " isCollectionUsageThresholdExceeded() returned true but" +

                    " getCollectionUsage() return null");

            }

        } else if (u.getUsed() >= 1) {

            if (!p.isCollectionUsageThresholdExceeded()) {

                throw new RuntimeException("TEST FAILED: " +

                    "Pool " + p.getName() +

                    " isCollectionUsageThresholdExceeded() returned false but " +

                    " threshold(" + p.getCollectionUsageThreshold() +

                    ") < used(" + u.getUsed() + ")");

            }

        } else {

            if (p.isCollectionUsageThresholdExceeded()) {

                throw new RuntimeException("TEST FAILED: " +

                    "Pool " + p.getName() +

                    " isCollectionUsageThresholdExceeded() returned true but" +

                    " threshold(" + p.getCollectionUsageThreshold() +

                    ") > used(" + u.getUsed() + ")");

            }

        }

        // disable low memory detection and isCollectionUsageThresholdExceeded()

        // should return false

        p.setCollectionUsageThreshold(0);

        if (p.isCollectionUsageThresholdExceeded()) {

            throw new RuntimeException("TEST FAILED: " +

                "Pool " + p.getName() +

                " isCollectionUsageThresholdExceeded() returned true but threshold = 0");

        }

    }

}