com.mrcd.mmat.monitor.FastBigJavaHeapOOMMonitor.kt 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 heap 急速激增 OOM 监控，策略
 *      1）本次 java heap 内存占用率达到最高告警阈值 （或）
 *      2）本次 java heap 内存占用率比上次的高了最高差值阈值
 * 

 * 

 * 
 Author:      chenlin
 * 
 Date:        2021/10/28
 */
class FastBigJavaHeapOOMMonitor : IMonitorJavaHeap{

    companion object {
        private const val REASON_MAX_USAGE_THRESHOLD = "max_usage_threshold"
        private const val REASON_MAX_GAP_THRESHOLD = "max_gap_threshold"
    }

    private var mDumpReason = ""

    override fun trackJavaHeap(mmatConfig: MMATConfig): Boolean {
        val javaHeap = SystemInfo.javaHeap

        // 危险占用率阈值，直接触发dump分析
        if (javaHeap.rate > mmatConfig.javaHeapDangerousUsageThreshold) {
            mDumpReason = REASON_MAX_USAGE_THRESHOLD
            println("java heap dangerous usage ==> dump")
            return true
        }else{
            println("below java heap dangerous usage ^_^ ")
        }

        // 高差值直接dump
        val lastJavaHeap = SystemInfo.lastJavaHeap
        if (lastJavaHeap.max != 0L && javaHeap.used - lastJavaHeap.used > mmatConfig.javaHeapDangerousGapThreshold) {
            mDumpReason = REASON_MAX_GAP_THRESHOLD
            println("java heap dangerous gap，huge memory allocated ==> dump")
            return true
        }else{
            println("below java heap dangerous gap ^_^ ")
        }

        return false
    }

    override fun reset() {
        mDumpReason = ""
    }

    override fun reason(): String {
        return "fast_big_mem_$mDumpReason"
    }
}