StoreUtil.java

/**
 * Copyright (C) 2010-2013 Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.rocketmq.store;

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;


/**
 * @author shijia.wxr<vintage.wang@gmail.com>
 * @since 13-8-3
 */
public class StoreUtil {
    public static final long TotalPhysicalMemorySize = getTotalPhysicalMemorySize();


    @SuppressWarnings("restriction")
    public static long getTotalPhysicalMemorySize() {
        long physicalTotal = 1024 * 1024 * 1024 * 24;
        OperatingSystemMXBean osmxb = ManagementFactory.getOperatingSystemMXBean();
        if (osmxb instanceof com.sun.management.OperatingSystemMXBean) {
            physicalTotal = ((com.sun.management.OperatingSystemMXBean) osmxb).getTotalPhysicalMemorySize();
        }

        return physicalTotal;
    }
}