JVMInfo.java

/*
 * (C) Copyright 2015-2016 the original author or authors.
 *
 * 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.
 *
 * Contributors:
 *   ohun@live.cn (夜色)
 */

package com.mpush.monitor.quota.impl;

import com.google.common.collect.Maps;
import com.mpush.monitor.quota.InfoQuota;
import com.mpush.monitor.quota.MonitorQuota;

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.RuntimeMXBean;
import java.util.Map;

public class JVMInfo implements InfoQuota {

    public static final JVMInfo I = new JVMInfo();

    private RuntimeMXBean runtimeMXBean;

    private OperatingSystemMXBean systemMXBean;

    private String currentPid;

    private JVMInfo() {
        runtimeMXBean = ManagementFactory.getRuntimeMXBean();
        systemMXBean = ManagementFactory.getOperatingSystemMXBean();
    }

    @Override
    public String pid() {
        if (null == currentPid) {
            currentPid = runtimeMXBean.getName().split("@")[0];
        }
        return currentPid;
    }

    @Override
    public double load() {
        double averageLoad = systemMXBean.getSystemLoadAverage();
        return averageLoad;
    }

    @Override
    public Object monitor(Object... args) {
        Map<String, Object> map = Maps.newHashMap();
        map.put("pid", pid());
        map.put("load", load());
        map.put("totalMemory", Runtime.getRuntime().totalMemory() / 1024 / 1024 + "m");
        map.put("freeMemory", Runtime.getRuntime().freeMemory() / 1024 / 1024 + "m");
        map.put("maxMemory", Runtime.getRuntime().maxMemory() / 1024 / 1024 + "m");
        return map;
    }
}