com.mrcd.mmat.monitor.JavaHeapOOMMonitor Maven / Gradle / Ivy

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package com.mrcd.mmat.monitor;

import com.mrcd.mmat.MMATConfig;
import com.mrcd.mmat.monitor.model.SystemInfo;

/**
 * 
 Description: Java 堆内存监控
 * 
 检测策略：1）当前 java heap 使用率 >= 配置的阈值 （且）
 *              2）连续 N 次当前 java heap 堆内存占用率下降 <= gap，N >= 配置的阈值
 * 

 * 
 Author:      chenlin
 * 
 Date:        2021/10/26
 */
public class JavaHeapOOMMonitor implements IMonitorJavaHeap{

    //上次 java heap 内存占用率
    private double mLastHeapRatio = 0d;

    //连续超过阈值的次数
    private int mOverThresholdCount = 0;


    /**
     *
 Description: 检测 java 堆内存是否符合告警标准，符合返回 true，不符合返回 false
     *
 Author:      chenlin
     *
 Date:        2021/10/26
     * @param mmatConfig
     */
    @Override
    public boolean trackJavaHeap(MMATConfig mmatConfig){

        boolean overThreshold = false;

        double usedRate = SystemInfo.INSTANCE.getJavaHeap().getRate();

//        String pattern1 = "TOTAL:";
//        String pattern2 = "TOTALSWAPPSS:";
//        if(result.contains(pattern1) && result.contains(pattern2)){
//            int firstIndex = pattern1.length();
//            int lastIndex = result.indexOf(pattern2);
//            String total = result.substring(firstIndex,lastIndex);
//            //当前进程占用的物理内存，单位 KB
//            long totalPss = Long.parseLong(total);
//            System.out.println("当前进程占用的物理内存："+ UnitUtil.kB2MStdOut(totalPss));
//
//            overThreshold = true;
//        }else {
//            System.out.println("结果不符合规范，结束此次检测");
//            overThreshold = false;
//        }

        if ( usedRate >= mmatConfig.javaHeapUsageWarnThreshold &&
                //本次内存占用率下降的幅度小于 gap
                usedRate >= mLastHeapRatio - mmatConfig.javaHeapUsageWarnCountThreshold) {

            mOverThresholdCount++;
            System.out.println("Java Heap 监控模块当前告警统计数："+mOverThresholdCount);

            if(mOverThresholdCount >= mmatConfig.javaHeapUsageWarnCountThreshold){
                overThreshold = true;
            }
        }else {
            System.out.println("不符合告警标准，真棒 ^_^");
            reset();
        }

        mLastHeapRatio = usedRate;

        return overThreshold;
    }

    @Override
    public void reset(){
        mLastHeapRatio = 0d;
        mOverThresholdCount = 0;
    }

    @Override
    public String reason() {
        return "reason_heap_oom";
    }
}