/*

 * Copyright (c) 2003, 2012, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package sun.management;

import java.util.Map;

import java.util.HashMap;

import sun.management.counter.Counter;

/**

 * Implementation class of HotspotThreadMBean interface.

 *

 * Internal, uncommitted management interface for Hotspot threading

 * system.

 */

class HotspotThread

    implements HotspotThreadMBean {

    private VMManagement jvm;

    /**

     * Constructor of HotspotThread class.

     */

    HotspotThread(VMManagement vm) {

        jvm = vm;

    }

    public native int getInternalThreadCount();

    public Map<String, Long> getInternalThreadCpuTimes() {

        int count = getInternalThreadCount();

        if (count == 0) {

            return java.util.Collections.emptyMap();

        }

        String[] names = new String[count];

        long[] times = new long[count];

        int numThreads = getInternalThreadTimes0(names, times);

        Map<String, Long> result = new HashMap<>(numThreads);

        for (int i = 0; i < numThreads; i++) {

            result.put(names[i], times[i]);

        }

        return result;

    }

    public native int getInternalThreadTimes0(String[] names, long[] times);

    // Performance counter support

    private static final String JAVA_THREADS    = "java.threads.";

    private static final String COM_SUN_THREADS = "com.sun.threads.";

    private static final String SUN_THREADS     = "sun.threads.";

    private static final String THREADS_COUNTER_NAME_PATTERN =

        JAVA_THREADS + "|" + COM_SUN_THREADS + "|" + SUN_THREADS;

    public java.util.List<Counter> getInternalThreadingCounters() {

        return jvm.getInternalCounters(THREADS_COUNTER_NAME_PATTERN);

    }

}