MemoryStatusChecker.java

/**
 * Project: dubbo.registry.server-1.1.0-SNAPSHOT
 * 
 * File Created at 2009-12-27
 * $Id: MemoryStatusChecker.java 181192 2012-06-21 05:05:47Z tony.chenl $
 * 
 * Copyright 2008 Alibaba.com Croporation Limited.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of
 * Alibaba Company. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Alibaba.com.
 */
package com.alibaba.dubbo.governance.status;

import com.alibaba.dubbo.common.status.Status;
import com.alibaba.dubbo.common.status.StatusChecker;

/**
 * MemoryStatus
 * 
 * @author william.liangf
 */
public class MemoryStatusChecker implements StatusChecker {

    public Status check() {
        Runtime runtime = Runtime.getRuntime();
        long freeMemory = runtime.freeMemory();
        long totalMemory = runtime.totalMemory();
        long maxMemory = runtime.maxMemory();
        boolean ok = (maxMemory - (totalMemory - freeMemory) > 2048); // 剩余空间小于2M报警
        String msg = "Max:" + (maxMemory / 1024 / 1024) + "M, Total:" 
        + (totalMemory / 1024 / 1024) + "M, Free:" + (freeMemory / 1024 / 1024) 
        + "M, Use:" + ((totalMemory / 1024 / 1024) - (freeMemory / 1024 / 1024)) + "M";
        return new Status(ok ? Status.Level.OK : Status.Level.WARN, msg);
    }

}