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

 *

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 *

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 * 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).

 *

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

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 *

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/*

 * @test

 * @bug     6314913

 * @summary Basic Test for HotSpotDiagnosticMXBean.setVMOption()

 *          and getDiagnosticOptions().

 * @author  Mandy Chung

 * @author  Jaroslav Bachorik

 *

 * @run main/othervm -XX:+HeapDumpOnOutOfMemoryError SetVMOption

 */

import java.lang.management.ManagementFactory;

import java.util.*;

import com.sun.management.HotSpotDiagnosticMXBean;

import com.sun.management.VMOption;

import com.sun.management.VMOption.Origin;

public class SetVMOption {

    private static final String HEAP_DUMP_ON_OOM = "HeapDumpOnOutOfMemoryError";

    private static final String EXPECTED_VALUE = "true";

    private static final String BAD_VALUE = "yes";

    private static final String NEW_VALUE = "false";

    private static final String MANAGEMENT_SERVER = "ManagementServer";

    private static HotSpotDiagnosticMXBean mbean;

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

        mbean =

            ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class);

        VMOption option = findHeapDumpOnOomOption();

        if (!option.getValue().equalsIgnoreCase(EXPECTED_VALUE)) {

            throw new RuntimeException("Unexpected value: " +

                option.getValue() + " expected: " + EXPECTED_VALUE);

        }

        if (option.getOrigin() != Origin.VM_CREATION) {

            throw new RuntimeException("Unexpected origin: " +

                option.getOrigin() + " expected: VM_CREATION");

        }

        if (!option.isWriteable()) {

            throw new RuntimeException("Expected " + HEAP_DUMP_ON_OOM +

                " to be writeable");

        }

        // set VM option to a new value

        mbean.setVMOption(HEAP_DUMP_ON_OOM, NEW_VALUE);

        option = findHeapDumpOnOomOption();

        if (!option.getValue().equalsIgnoreCase(NEW_VALUE)) {

            throw new RuntimeException("Unexpected value: " +

                option.getValue() + " expected: " + NEW_VALUE);

        }

        if (option.getOrigin() != Origin.MANAGEMENT) {

            throw new RuntimeException("Unexpected origin: " +

                option.getOrigin() + " expected: MANAGEMENT");

        }

        VMOption o = mbean.getVMOption(HEAP_DUMP_ON_OOM);

        if (!option.getValue().equals(o.getValue())) {

            throw new RuntimeException("Unmatched value: " +

                option.getValue() + " expected: " + o.getValue());

        }

        if (!option.getValue().equals(o.getValue())) {

            throw new RuntimeException("Unmatched value: " +

                option.getValue() + " expected: " + o.getValue());

        }

        if (option.getOrigin() != o.getOrigin()) {

            throw new RuntimeException("Unmatched origin: " +

                option.getOrigin() + " expected: " + o.getOrigin());

        }

        if (option.isWriteable() != o.isWriteable()) {

            throw new RuntimeException("Unmatched writeable: " +

                option.isWriteable() + " expected: " + o.isWriteable());

        }

        // check if ManagementServer is not writeable

        List<VMOption> options = mbean.getDiagnosticOptions();

        VMOption mgmtServerOption = null;

        for (VMOption o1 : options) {

            if (o1.getName().equals(MANAGEMENT_SERVER)) {

                 mgmtServerOption = o1;

                 break;

            }

        }

        if (mgmtServerOption != null) {

            throw new RuntimeException(MANAGEMENT_SERVER +

                " is not expected to be writeable");

        }

        mgmtServerOption = mbean.getVMOption(MANAGEMENT_SERVER);

        if (mgmtServerOption == null) {

            throw new RuntimeException(MANAGEMENT_SERVER +

                " should exist.");

        }

        if (mgmtServerOption.getOrigin() != Origin.DEFAULT) {

            throw new RuntimeException(MANAGEMENT_SERVER +

                " should have the default value.");

        }

        if (mgmtServerOption.isWriteable()) {

            throw new RuntimeException(MANAGEMENT_SERVER +

                " is not expected to be writeable");

        }

    }

    public static VMOption findHeapDumpOnOomOption() {

        List<VMOption> options = mbean.getDiagnosticOptions();

        VMOption gcDetails = null;

        for (VMOption o : options) {

            if (o.getName().equals(HEAP_DUMP_ON_OOM)) {

                 gcDetails = o;

                 break;

            }

        }

        if (gcDetails == null) {

            throw new RuntimeException("VM option " + HEAP_DUMP_ON_OOM +

                " not found");

        }

        return gcDetails;

    }

}